Rev. 1.3
CMOS 16-BIT SINGLE CHIP MICROCONTROLLER
S1C17001
Technical Manual
©
SEIKO EPSON CORPORATION
2011, All rights reserved.
NOTICE
No part of this material may be reproduced or duplicated in any form or by any means without the written permission of Seiko
Epson. Seiko Epson reserves the right to make changes to this material without notice. Seiko Epson does not assume any liabil-
ity of any kind arising out of any inaccuracies contained in this material or due to its application or use in any product or circuit
and, further, there is no representation that this material is applicable to products requiring high level reliability, such as, medical
products. Moreover, no license to any intellectual property rights is granted by implication or otherwise, and there is no represen-
tation or warranty that anything made in accordance with this material will be free from any patent or copyright infringement of a
third party. This material or portions thereof may contain technology or the subject relating to strategic products under the control
of the Foreign Exchange and Foreign Trade Law of Japan and may require an export license from the Ministry of Economy, Trade
and Industry or other approval from another government agency.
This product uses SuperFlash® technology licensed from Silicon Storage Technology, Inc.
All brands or product names mentioned herein are trademarks and/or registered trademarks of their respective companies.
Devices
S1 C 17xxx F 00E1
Packing specifications
00 : Besides tape & reel
0A : TCP BL 2 directions
0B : Tape & reel BACK
0C : TCP BR 2 directions
0D : TCP BT 2 directions
0E : TCP BD 2 directions
0F : Tape & reel FRONT
0G: TCP BT 4 directions
0H : TCP BD 4 directions
0J : TCP SL 2 directions
0K : TCP SR 2 directions
0L : Tape & reel LEFT
0M: TCP ST 2 directions
0N : TCP SD 2 directions
0P : TCP ST 4 directions
0Q: TCP SD 4 directions
0R : Tape & reel RIGHT
99 : Specs not fixed
Specification
Package
D: die form; F: QFP, B: BGA
Model number
Model name
C: microcomputer, digital products
Product classification
S1: semiconductor
Development tools
S5U1 C 17000 H2 1
Packing specifications
00: standard packing
Version
1: Version 1
Tool type
Hx : ICE
Dx : Evaluation board
Ex : ROM emulation board
Mx: Emulation memory for external ROM
Tx : A socket for mounting
Cx : Compiler package
Sx : Middleware package
Corresponding model number
17xxx: for S1C17xxx
Tool classification
C: microcomputer use
Product classification
S5U1: development tool for semiconductor products
00
00
Configuration of product number
CONTENTS
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation i
– Contents –
1 Overview ..................................................................................................................... 1
1.1 Features ........................................................................................................................... 1
1-2 Block Diagram .................................................................................................................. 2
1.3 Pins .................................................................................................................................. 3
1.3.1 Pinout Diagram ................................................................................................... 3
1.3.2 Package (QFP12-48pin) ..................................................................................... 4
1.3.3 Pin Descriptions .................................................................................................. 6
2 CPU ................................................................................................................................. 7
2.1 S1C17 Core Features ....................................................................................................... 7
2.2 CPU Registers .................................................................................................................. 8
2.3 Command Set ................................................................................................................... 9
2.4 Vector Table ...................................................................................................................... 13
0xffff80: Vector Table Base Register (TTBR) .............................................................................. 13
2.5 Processor Information ...................................................................................................... 14
0xffff84: Processor ID Register (IDIR) ........................................................................................ 14
3 Memory Map and Bus Control ..................................................................................... 15
3.1 Bus Cycle ......................................................................................................................... 16
3.1.1 Access Size Restrictions.................................................................................... 16
3.1.2 Command Execution Cycle Restrictions ............................................................ 16
3.2 Internal ROM Area ........................................................................................................... 17
3.2.1 Internal ROM ..................................................................................................... 17
3.2.2 ROM Read Access Cycle Settings .................................................................... 17
0x5320: ROM Control Register (MISC_FL) ................................................................................17
3.3 Internal RAM Area............................................................................................................ 18
3.3.1 Internal RAM ...................................................................................................... 18
3.4 Internal Peripheral Circuit Area ........................................................................................ 19
3.4.1 Internal Peripheral Circuit Area 1 (0x4000 onward) ........................................... 19
3.4.2 Internal Peripheral Circuit Area 2 (0x5000 onward) ........................................... 19
3.4.3 I/O Map .............................................................................................................. 20
3.5 Core I/O Reserved Area ................................................................................................... 23
4 Power Supply Voltage ................................................................................................... 25
5 Initial Reset ................................................................................................................... 27
5.1 Initial Reset Factors .......................................................................................................... 27
5.1.1 #RESET pin ....................................................................................................... 27
5.1.2 P0 Port Key-Entry Reset .................................................................................... 28
5.1.3 Reset by Watchdog Timer .................................................................................. 28
5.2 Initial Reset Sequence ..................................................................................................... 29
5.3 Initial Settings at Initial Resetting ..................................................................................... 30
6 Interrupt Controller ....................................................................................................... 31
6.1 ITC Configuration ............................................................................................................. 31
6.2 Vector Table ...................................................................................................................... 32
6.3 Maskable Interrupt Control ............................................................................................... 33
6.3.1 ITC Enable ......................................................................................................... 33
6.3.2 Interrupt Request from Peripheral Module and Interrupt Flag ........................... 33
6.3.3 Interrupt Permission/Prohibition ......................................................................... 34
6.3.4 Processing for Multiple Interrupts ...................................................................... 35
6.3.5 Interrupt Trigger Modes ...................................................................................... 36
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ii Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
6.3.6 S1C17 Core Interrupt Processing ...................................................................... 38
6.4 NMI ................................................................................................................................... 39
6.5 Software Interrupts ........................................................................................................... 40
6.6 HALT and SLEEP Mode Cancellation by Interrupt Factors .............................................. 41
6.7 Control Register Details ................................................................................................... 42
0x4300: Interrupt Flag Register (ITC_IFLG) ............................................................................... 43
0x4302: Interrupt Enable Register (ITC_EN) ..............................................................................45
0x4304: ITC Control Register (ITC_CTL) ................................................................................... 46
0x4306: External Interrupt Level Setup Register 0 (ITC_ELV0) .................................................47
0x4308: External Interrupt Level Setup Register 1 (ITC_ELV1) .................................................48
0x430a: External Interrupt Level Setup Register 2 (ITC_ELV2) .................................................49
0x430c: External Interrupt Level Setup Register 3 (ITC_ELV3) .................................................. 50
0x430e: Internal Interrupt Level Setup Register 0 (ITC_ILV0) ....................................................51
0x4310: Internal Interrupt Level Setup Register 1 (ITC_ILV1) .................................................... 52
0x4312: Internal Interrupt Level Setup Register 2 (ITC_ILV2) ....................................................53
0x4314: Internal Interrupt Level Setup Register 3 (ITC_ILV3) ....................................................54
6.8 Precautions ..................................................................................................................... 55
7 Oscillator Circuit (OSC) ............................................................................................... 57
7.1 OSC Module Configuration .............................................................................................. 57
7.2 OSC3 Oscillator Circuit .................................................................................................... 58
7.3 OSC1 Oscillator Circuit .................................................................................................... 60
7.4 System Clock Switching ................................................................................................... 61
7.5 8-bit OSC1 Timer Clock Control ....................................................................................... 62
7.6 Clock External Output (FOUT3, FOUT1) ......................................................................... 63
7.7 RESET and NMI Input Noise Filters ................................................................................. 65
7.8 Control Register Details ................................................................................................... 66
0x5060: Clock Source Select Register (OSC_SRC) ..................................................................67
0x5061: Oscillation Control Register (OSC_CTL) ...................................................................... 68
0x5062: Noise Filter Enable Register (OSC_NFEN) .................................................................. 69
0x5064: FOUT Control Register (OSC_FOUT) .......................................................................... 70
0x5065: T8OSC1 Clock Control Register (OSC_T8OSC1) ........................................................71
7.9 Precautions ..................................................................................................................... 72
8. Clock Generator (CLG) ................................................................................................ 73
8.1 Clock Generator Configuration ......................................................................................... 73
8.2 CPU Core Clock (CCLK) Control ..................................................................................... 74
8.3 Peripheral Module Clock (PCLK) Control ......................................................................... 75
8.4 Control Register Details ................................................................................................... 76
0x5080: PCLK Control Register (CLG_PCLK) ........................................................................... 77
0x5081: CCLK Control Register (CLG_CCLK) ........................................................................... 78
8.5 Precautions ...................................................................................................................... 79
9. Prescaler (PSC) ............................................................................................................ 81
9.1 Prescaler Configuration .................................................................................................... 81
9.2 Control Register Details ................................................................................................... 82
0x4020: Prescaler Control Register (PSC_CTL) ........................................................................ 82
9.3 Precautions ...................................................................................................................... 83
10 Input/Output Port (P) .................................................................................................. 85
10.1 Input/Output Port Configuration ..................................................................................... 85
10.2 Input/Output Pin Function Selection (Port MUX) ............................................................ 86
10.3 Data Input/Output ........................................................................................................... 87
10.4 Pull-up Control ............................................................................................................... 88
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S1C17001 TECHNICAL MANUAL Seiko Epson Corporation iii
10.5 Input Interface Level ....................................................................................................... 89
10.6 P0 Port Chattering Filter Function .................................................................................. 90
10.7 Port Input Interrupt ......................................................................................................... 91
10.8 Control Register Details ................................................................................................. 94
0x5200/0x5210/0x5220/0x5230: Px Port Input Data Registers (Px_IN) ....................................95
0x5201/0x5211/0x5221/0x5231: Px Port Output Data Registers (Px_OUT) ..............................96
0x5202/0x5212/0x5222/0x5232: Px Port I/O Direction Control Registers (Px_IO) .................... 97
0x5203/0x5213/0x5223/0x5233: Px Port Pull-up Control Registers (Px_PU) ............................ 98
0x5205/5215: Px Port Interrupt Mask Registers (Px_IMSK) ...................................................... 99
0x5206/5216: Px Port Interrupt Edge Select Registers (Px_EDGE) ......................................... 100
0x5207/5217: Px Port Interrupt Flag Registers (Px_IFLG) .......................................................101
0x5208: P0 Port Chattering Filter Control Register (P0_CHAT) ................................................ 102
0x5209: P0 Port Key-Entry Reset Configuration Register (P0_KRST) ...................................... 103
0x52a0: P0 Port Function Select Register (P0_PMUX) .............................................................104
0x52a1: P1 Port Function Select Register (P1_PMUX) .............................................................105
0x52a2: P2 Port Function Select Register (P2_PMUX) .............................................................106
0x52a3: P3 Port Function Select Register (P3_PMUX) .............................................................107
10.9 Precautions ................................................................................................................... 108
11 16-bit Timer (T16) ....................................................................................................... 109
11.1 16-bit Timer Overview ................................................................................................... 109
11.2 16-bit Timer Operating Modes ....................................................................................... 110
11.2.1 Internal Clock Mode ........................................................................................ 110
11.2.2 External Clock Mode ....................................................................................... 111
11.2.3 Pulse Width Measurement Mode .................................................................... 112
11.3 Count Mode ................................................................................................................... 113
11.4 16-bit Timer Reload Register and Underflow Cycle ...................................................... 114
11.5 16-bit Timer Reset ......................................................................................................... 115
11.6 16-bit Timer RUN/STOP Control ................................................................................... 116
11.7 16-bit Timer Output Signal ............................................................................................ 117
11.8 16-bit Timer Interrupts ................................................................................................... 118
11.9 Control Register Details ................................................................................................ 119
0x4220/0x4240/0x4260: 16-bit Timer Ch.x Input Clock Select Registers (T16_CLKx) .............120
0x4222/0x4242/0x4262: 16-bit Timer Ch.x Reload Data Registers (T16_TRx) ........................ 121
0x4224/0x4244/0x4264: 16-bit Timer Ch.x Counter Data Registers (T16_TCx) ....................... 122
0x4226/0x4246/0x4266: 16-bit Timer Ch.x Control Registers (T16_CTLx)............................... 123
11.10 Precautions ................................................................................................................. 125
12 8-bit Timer (T8F) ......................................................................................................... 127
12.1 8-bit Timer Overview ..................................................................................................... 127
12.2 8-bit Timer Count Mode ................................................................................................. 128
12.3 Count Clock ................................................................................................................... 129
12.4 8-bit Timer Reload Register and Underflow Cycle ........................................................ 130
12.5 8-bit Timer Reset ........................................................................................................... 131
12.6 8-bit Timer RUN/STOP Control ..................................................................................... 132
12.7 8-bit Timer Output Signal .............................................................................................. 133
12.8 Fine Mode ..................................................................................................................... 134
12.9 8-bit Timer Interrupts ..................................................................................................... 135
12.10 Control Register Details .............................................................................................. 136
0x4200: 8-bit Timer Input Clock Select Register (T8F_CLK) ..................................................... 137
0x4202: 8-bit Timer Reload Data Register (T8F_TR) ................................................................138
0x4204: 8-bit Timer Counter Data Register (T8F_TC)............................................................... 139
0x4206: 8-bit Timer Control Register (T8F_CTL) ......................................................................140
12.11 Precautions ................................................................................................................. 142
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iv Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
13 PWM & Capture Timer (T16E) ................................................................................... 143
13.1 PWM & Capture Timer Overview .................................................................................. 143
13.2 PWM & Capture Timer Operating Modes ...................................................................... 144
13.3 Setting and Resetting Counter Value ............................................................................ 145
13.4 Compare Data Settings ................................................................................................. 146
13.5 PWM & Capture Timer RUN/STOP Control .................................................................. 147
13.6 Clock Output Control ..................................................................................................... 148
13.7 PWM & Capture Timer Interrupts .................................................................................. 151
13.8 Control Register Details ................................................................................................ 153
0x5300: PWM Timer Compare Data A Register (T16E_CA) .....................................................154
0x5302: PWM Timer Compare Data B Register (T16E_CB) .....................................................155
0x5304: PWM Timer Counter Data Register (T16E_TC)........................................................... 156
0x5306: PWM Timer Control Register (T16E_CTL) ..................................................................157
0x5308: PWM Timer Input Clock Select Register (T16E_CLK) ................................................. 159
0x530a: PWM Timer Interrupt Mask Register (T16E_IMSK) .....................................................160
0x530c: PWM Timer Interrupt Flag Register (T16E_IFLG) ....................................................... 161
13.9 Precautions ................................................................................................................... 162
14 8-bit OSC1 Timer (T8OSC1) ...................................................................................... 163
14.1 8-bit OSC1 Timer Overview .......................................................................................... 163
14.2 8-bit OSC1 Timer Count Mode ...................................................................................... 164
14.3 Count Clock ................................................................................................................... 165
14.4 Resetting 8-bit OSC1 Timer .......................................................................................... 166
14.5 Compare Data Settings ................................................................................................. 167
14.6 8-bit OSC1 Timer RUN/STOP Control........................................................................... 168
14.7 8-bit OSC1 Timer Interrupts .......................................................................................... 169
14.8 Control Register Details ................................................................................................ 171
0x50c0: 8-bit OSC1 Timer Control Register (T8OSC1_CTL) .................................................... 172
0x50c1: 8-bit OSC1 Timer Counter Data Register (T8OSC1_CNT) .......................................... 173
0x50c2: 8-bit OSC1 Timer Compare Data Register (T8OSC1_CMP) ....................................... 174
0x50c3: 8-bit OSC1 Timer Interrupt Mask Register (T8OSC1_IMSK) ....................................... 175
0x50c4: 8-bit OSC1 Timer Interrupt Flag Register (T8OSC1_IFLG) ......................................... 176
14.9 Precautions ................................................................................................................... 177
15 Clock Timer (CT) ........................................................................................................ 179
15.1 Clock Timer Overview ................................................................................................... 179
15.2 Operation Clock............................................................................................................. 180
15.3 Clock Timer Resetting ................................................................................................... 181
15.4 Clock Timer RUN/STOP Control ................................................................................... 182
15.5 Clock Timer Interrupts ................................................................................................... 183
15.6 Control Register Details ................................................................................................ 185
0x5000: Clock Timer Control Register (CT_CTL) ...................................................................... 186
0x5001: Clock Timer Counter Register (CT_CNT) .................................................................... 187
0x5002: Clock Timer Interrupt Mask Register (CT_IMSK)......................................................... 188
0x5003: Clock Timer Interrupt Flag Register (CT_IFLG) ........................................................... 189
15.7 Precautions ................................................................................................................... 190
16 Stopwatch Timer (SWT) ............................................................................................. 191
16.1 Stopwatch Timer Overview............................................................................................ 191
16.2 BCD Counters ............................................................................................................... 192
16.3 Operation Clock............................................................................................................. 193
16.4 Stopwatch Timer Resetting ........................................................................................... 194
16.5 Stopwatch Timer RUN/STOP Control ............................................................................ 195
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S1C17001 TECHNICAL MANUAL Seiko Epson Corporation v
16.6 Stopwatch Timer Interrupts ........................................................................................... 196
16.7 Control Register Details ................................................................................................ 198
0x5020: Stopwatch Timer Control Register (SWT_CTL) ........................................................... 199
0x5021: Stopwatch Timer BCD Counter Register (SWT_BCNT) .............................................. 200
0x5022: Stopwatch Timer Interrupt Mask Register (SWT_IMSK)..............................................201
0x5023: Stopwatch Timer Interrupt Flag Register (SWT_IFLG) ................................................ 202
16.8 Precautions ................................................................................................................... 203
17 Watchdog Timer (WDT) .............................................................................................. 205
17.1 Watchdog Timer Overview ............................................................................................ 205
17.2 Operation Clock............................................................................................................. 206
17.3 Watchdog Timer Control ................................................................................................ 207
17.3.1 NMI/Reset Mode Selection ............................................................................. 207
17.3.2 Watchdog Timer Run/Stop Control ................................................................. 207
17.3.3 Watchdog Timer Resetting .............................................................................. 207
17.3.4 Operation in Standby Mode ............................................................................ 207
17.4 Control Register Details ................................................................................................ 208
0x5040: Watchdog Timer Control Register (WDT_CTL) ............................................................ 209
0x5041: Watchdog Timer Status Register (WDT_ST) ............................................................... 210
17.5 Precautions ................................................................................................................... 211
18 UART ........................................................................................................................... 213
18.1 UART Configuration ...................................................................................................... 213
18.2 UART Pin ...................................................................................................................... 214
18.3 Transfer Clock ................................................................................................................ 215
18.4 Transfer Data Settings ................................................................................................... 216
18.5 Data Transfer Control .................................................................................................... 217
18.6 Receive Errors............................................................................................................... 220
18.7 UART Interrupts ............................................................................................................ 221
18.8 IrDA Interface ................................................................................................................ 223
18.9 Control Register Details ................................................................................................ 225
0x4100: UART Status Register (UART_ST) .............................................................................. 226
0x4101: UART Transmit Data Register (UART_TXD) ................................................................228
0x4102: UART Receive Data Register (UART_RXD) ................................................................ 229
0x4103: UART Mode Register (UART_MOD) ............................................................................230
0x4104: UART Control Register (UART_CTL) ........................................................................... 231
0x4105: UART Expansion Register (UART_EXP) .....................................................................232
18.10 Precautions ................................................................................................................. 233
19 SPI ............................................................................................................................... 235
19.1 SPI Configuration .......................................................................................................... 235
19.2 SPI Input/Output Pins .................................................................................................... 236
19.3 SPI Clock ...................................................................................................................... 237
19.4 Data Transfer Condition Settings ................................................................................... 238
19.5 Data Transfer Control .................................................................................................... 239
19.6 SPI Interrupts ................................................................................................................ 242
19.7 Control Register Details ................................................................................................ 244
0x4320: SPI Status Register (SPI_ST) ...................................................................................... 245
0x4322: SPI Transmit Data Register (SPI_TXD) .......................................................................246
0x4324: SPI Receive Data Register (SPI_RXD) .......................................................................247
0x4326: SPI Control Register (SPI_CTL) .................................................................................. 248
19.8 Precautions ................................................................................................................... 250
20 I2C ................................................................................................................................ 251
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vi Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
20.1 I2C Configuration ........................................................................................................... 251
20.2 I2C Input/Output Pins .................................................................................................... 252
20.3 I2C Clock ....................................................................................................................... 253
20.4 Settings Before Data Transfer ....................................................................................... 254
20.5 Data Transfer Control .................................................................................................... 255
20.6 I2C Interrupts ................................................................................................................ 262
20.7 Control Register Details ................................................................................................ 263
0x4340: I2C Enable Register (I2C_EN) .....................................................................................264
0x4342: I2C Control Register (I2C_CTL) ................................................................................... 265
0x4344: I2C Data Register (I2C_DAT) .......................................................................................267
0x4346: I2C Interrupt Control Register (I2C_ICTL) .................................................................... 269
21 Remote Controller (REMC) ....................................................................................... 271
21.1 REMC Configuration ..................................................................................................... 271
21.2 REMC Input/output Pin ................................................................................................. 272
21.3 Carrier Generation ........................................................................................................ 273
21.4 Data Length Counter Clock Settings ............................................................................. 274
21.5 Data Transfer Control .................................................................................................... 275
21.6 REMC Interrupts ........................................................................................................... 278
21.7 Control Register Details ................................................................................................ 280
0x5340: REMC Configuration Register (REMC_CFG) .............................................................. 281
0x5341: REMC Prescaler Clock Select Register (REMC_PSC) ...............................................282
0x5342: REMC H Carrier Length Setup Register (REMC_CARH) ............................................ 283
0x5343: REMC L Carrier Length Setup Register (REMC_CARL) ............................................. 284
0x5344: REMC Status Register (REMC_ST) ............................................................................ 285
0x5345: REMC Length Counter Register (REMC_LCNT) ......................................................... 286
0x5346: REMC Interrupt Mask Register (REMC_IMSK) ........................................................... 287
0x5347: REMC Interrupt Flag Register (REMC_IFLG) .............................................................288
21.8 Precautions ................................................................................................................... 289
22 On-chip Debugger (DBG) .......................................................................................... 291
22.1 Resource Requirements and Debugging Tool ............................................................... 291
22.2 Debug Break Operation Status ..................................................................................... 292
22.3 Control Register Details ................................................................................................ 293
0x5322: OSC1 Peripheral Control Register (MISC_OSC1) ...................................................... 294
0xffff90: Debug RAM Base Register (DBRAM) ........................................................................295
23 Basic External Connection Diagram ........................................................................ 297
24 Electrical Characteristics .......................................................................................... 299
24.1 Absolute Maximum Ratings .......................................................................................... 299
24.2 Recommended Operating Conditions ........................................................................... 299
24.3 DC Characteristics ........................................................................................................ 300
24.4 Consumption Current .................................................................................................... 301
24.5 AC Characteristics......................................................................................................... 302
24.5.1 SPI AC Characteristics ................................................................................... 302
24.5.2 I2C AC Characteristics .................................................................................... 302
24.5.3 External Clock Input AC Characteristics ......................................................... 303
24.5.4 System AC Characteristics ............................................................................. 303
24.6 Oscillation Characteristics ............................................................................................. 304
25 Package ...................................................................................................................... 305
Appendix A: I/O Register List ........................................................................................ 307
0x4020 Prescaler ....................................................................... 310
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S1C17001 TECHNICAL MANUAL Seiko Epson Corporation vii
0x4100–0x4105 UART (with IrDA) ........................................................... 311
0x4200–0x4206 8-bit Timer (with Fine Mode) .......................................... 312
0x4220–0x4266 16-bit Timer .................................................................... 313
0x4300–0x4314 Interrupt Controller......................................................... 315
0x4320–0x4326 SPI ................................................................................. 317
0x4340–0x4346 I2C .................................................................................. 318
0x5000–0x5003 Clock Timer .................................................................... 319
0x5020–0x5023 Stopwatch Timer ............................................................ 320
0x5040–0x5041 Watchdog Timer............................................................. 321
0x5060–0x5065 Oscillator ........................................................................ 322
0x5080–0x5081 Clock Generator ............................................................ 323
0x50c0–0x50c4 8-bit OSC1 Timer ........................................................... 324
0x5200–0x52a3 P Port & Port MUX ......................................................... 325
0x5300–0x530c PWM & Capture Timer ................................................... 327
0x5320–0x5322 MISC Registers ............................................................. 328
0x5340–0x5347 Remote Controller ......................................................... 329
0xffff80–0xffff90 S1C17 Core I/O ............................................................. 330
Appendix B: Power Saving ............................................................................................ 331
B.1 Clock Control Power Saving............................................................................................ 331
Appendix C: Mounting Precautions .............................................................................. 334
Appendix D: Initialization Routine ................................................................................ 337
Appendix E: S1C17001 Mask ROM Code Development .............................................. 339
Appendix F: Revision History........................................................................................ 340
Revision History
1 OVERVIEW
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 1
1 Overview
The S1C7001 is a 16-bit MCU featuring high-speed low-power operations, compact dimensions, wide address
space, and on-chip ICE. In addition to the S1C17 CPU core, it incorporates 32 Kbytes of ROM, 2 Kbytes of RAM,
a serial interface supporting various sensors such as UART, SPI, and I2C high-bit-rate and IrDA1.0 compatibility,
8-bit timer, 16-bit timer, PWM & capture timer, clock timer, stopwatch timer, watchdog timer, and 28 general pur-
pose input/output ports.
It allows 8.2 MHz high-speed operation at an operating voltage of just 1.8 V, and executes single commands using
a single clock with 16-bit RISC processing.
1.1 Features
The main features of the S1C17001 are listed below.
●CPU • Epson original 16-bit RISC CPU core S1C17
●Main (OSC3) oscillator circuit • Crystal oscillator circuit, ceramic oscillator circuit, or external
clock input 8.2 MHz (max)
●Sub (OSC1) oscillator circuit • Crystal oscillator circuit or external clock input 32.786 kHz (typ)
●Internal ROM • 32 Kbytes
●Internal RAM • 2 Kbytes
●Input/output port • Max. 28-bit general purpose input/output (shared with periph-
eral circuit input/output pins)
●Serial interface • SPI (master/slave) 1ch.
• UART (IrDA1.0 compatible) 1ch.
• I2C (master) 1ch.
• Remote controller (REMC) 1ch.
●Timer • 8-bit timer (T8F) 1ch.
• 16-bit timer (T16) 3ch.
• PWM& capture timer (T16E) 1ch.
• Clock timer (CT) 1ch.
• Stopwatch timer (SWT) 1ch.
• Watchdog timer (WDT) 1ch.
• 8-bit OSC1 timer (T8OSC1) 1ch.
●Interrupt • Reset
• NMI
• Hardware interrupt x14 (8 levels)
●Power supply voltage • Core voltage (LVDD) 1.65 V to 2.7 V
• I/O voltage (HVDD) 1.65 V to 3.6 V
●Operating temperature • -40°C to 85°C
●Current consumption (typ.) • 0.5 µA in SLEEP mode
• 2.5 µA in HALT mode (32 kHz)
• 10 µA when operating (32 kHz)
1800 µA when operating (8 MHz)
●Configuration as shipped • WCSP-48pin package
●Mask ROM code development Flash memory • S1C17704 (refer to Appendix E for details)
1 OVERVIEW
2 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
1-2 Block Diagram
CPU Core S1C17
Internal RAM
(2K bytes)
8-bit timer
16-bit timer
Prescaler Clock timer
Watchdog timer
Remote controller
MISC register
Internal ROM
(32K bytes)
32 bits
1 cycle
16 bits
1–5 cycles
Interrupt system
8/16 bits
3 cycles
DCLK, DST2,
DSIO(P31–33)
REMI(P04),
REMO(P05)
P00–07, P10–17,
P20–27, P30–33
EXCL0–2
(P16, P07, P06)
SIN, SOUT, SCLK
(P23–25)
SDI, SDO, SPICLK
(P20–22)
8/16 bits
1 cycle
I/O 2 (0x5000–)
Interrupt controller
UART
SPI
I2CSDA, SCL
(P14–15)
I/O 1 (0x4000–)
I/O port/
I/O MUX
#TEST0–5
Reset circuit
Test circuit
#RESET
Oscillator/
Clock generator
Stopwatch timer
PWM & capture
timer
8-bit OSC1 timer
OSC1–2, OSC3–4
FOUT1(P13),
FOUT3(P30)
EXCL3(P27),
TOUT(P26)
Figure 1.2.1: Block diagram
1 OVERVIEW
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 3
1.3 Pins
1.3.1 Pinout Diagram
A
B
C
D
E
F
G
A
B
C
D
E
F
G
76543211234567
A1 Corner A1 Corner
Index
Top View
Top View
Bottom View
P07
EXCL1
A
B
C
D
E
F
G
1
P05
REMO
#TEST2
P06
EXCL2
P15
SCL
P16
EXCL0
LVDD LVDD
DSIO
P33
DST2
P32
TEST0 P17
#SPISS
#TEST1 P21
SDO
VSS
VSS
VSS
VSS
VSSP04
REMI
DCLK
P31
P14
SDA
P20
SDI
HVDD
HVDDP02
P03
P01
P00
P22
SPICLK
P23
SIN
P24
SOUT
P12
P10
P13
FOUT1
P25
SCLK
OSC4
P11
#RESET
P27
EXCL3
#TEST4
OSC3
#TEST3
P26
TOUT
P30
FOUT3
OSC1
OSC2
#TEST5
234567
Figure 1.3.1.1: Pinout diagram (WCSP-48pin)
1 OVERVIEW
4 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
1.3.2 Package (QFP12-48pin)
QFP12-48pin package
2536
9
7
13
24
7
9
12
0.13-0.27
10.3-0.7
0.09-0.2
0°-10°
0.5
1.4
0.1
1.7
1
48
37
Index
Figure 1.3.2.1 QFP12-48pin package scale
1 OVERVIEW
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 5
QFN7-48pin package
D
E
S
Symbol
D
E
A
A1
b
e
L
X
y
Min
-
-
-
0
0.17
-
0.3
-
-
Nom
7
7
-
-
-
0.5
-
-
-
Max
-
-
1
-
0.3
-
0.5
0.1
0.08
Dimension in Millimeters
Top View
Index
Bottom View
12
13
25
24
36
3748
1
e
yS
A
A1
L
Figure 1.3.2.2 QFN7-48pin package scale
1 OVERVIEW
6 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
1.3.3 Pin Descriptions
Table 1.3.3.1: Pin descriptions
Pin/ball No.
Name I/O Default
status Function
QFN7
-48PIN
QFP12
-48PIN
WCSP
37 37 A1 #TEST2 I I（Pull-Up）Test pin (fixed at High during normal operations)
38 38 A2 P05/REMO I/O I(Pull-Up）Input/output port pin (with interrupt)*/ Remote output pin
39 39 B3 P04/REMI I/O I(Pull-Up）Input/output port pin (with interrupt)*/ Remote input pin
40 40 A3 VSS - - Power supply pin (GND)
41 41 B4 P03 I/O I(Pull-Up）Input/output port pin (with interrupt)
42 42 A4 P02 I/O I(Pull-Up）Input/output port pin (with interrupt)
43 43 C4 P01 I/O I(Pull-Up）Input/output port pin (with interrupt)
44 44 D4 P00 I/O I(Pull-Up）Input/output port pin (with interrupt)
45 45 A5 HVDD - - Power supply pin (HVDD+)
46 46 B5 P12 I/O I(Pull-Up）Input/output port pin (with interrupt)
47 47 A6 P11 I/O I(Pull-Up）Input/output port pin (with interrupt)
48 48 C5 P10 I/O I(Pull-Up）Input/output port pin (with interrupt)
1 1 A7 #TEST3 I I（Pull-Up）Test pin (fixed at High during normal operations)
2 2 B6 #RESET I I（Pull-Up）Initial set input pin
3 3 B7 VSS - - Power supply pin (GND)
4 4 C6 P27/EXCL3 I/O I(Pull-Up）Input/output port pin*/ T16E external clock input pin
5 5 C7 P26/TOUT I/O I(Pull-Up）Input/output port pin*/ T16E PWM signal output pin
6 6 D5 P13/FOUT1 I/O I(Pull-Up）Input/output port pin (with interrupt)*/ OSC1 clock output pin
7 7 D7 P30/FOUT3 I/O I(Pull-Up）Input/output port pin*/ OSC3 division clock output pin
8 8 D6 LVDD - - Power supply pin (LVDD+)
9 9 E6 VSS - - Power supply pin (GND)
10 10 E7 OSC1 I I OSC1 oscillator input pin (permits external clock input)
11 11 F7 OSC2 O O OSC1 oscillator output pin
12 12 F6 #TEST4 I I（Pull-Up）Test pin (fixed at High during normal operations)
13 13 G7 #TEST5 I I（Pull-Up）Test pin (fixed at High during normal operations)
14 14 G6 OSC3 I I OSC3 oscillator input pin (permits external clock input)
15 15 G5 OSC4 O O OSC3 oscillator output pin
16 16 F5 VSS - - Power supply pin (GND)
17 17 E5 P25/SCLK I/O I(Pull-Up）Input/output port pin*/ UART clock input pin
18 18 G4 P24/SOUT I/O I(Pull-Up）Input/output port pin*/ UART data output pin
19 19 F4 P23/SIN I/O I(Pull-Up）Input/output port pin*/ UART data input pin
20 20 G3 HVDD - - Power supply pin (HVDD+)
21 21 E4 P22/SPICLK I/O I(Pull-Up）Input/output port pin*/ SPI clock input/output pin
22 22 G2 P21/SDO I/O I(Pull-Up）Input/output port pin*/ SPI data output pin
23 23 F3 P20/SDI I/O I(Pull-Up）Input/output port pin*/ SPI data input pin
24 24 F2 P17/#SPISS I/O I(Pull-Up）Input/output port pin (with interrupt)*/ SPI slave select input
pin
25 25 G1 #TEST1 I I（Pull-Up）Test pin (fixed at High during normal operations)
26 26 F1 TEST0 I
I（Pull-Down）
Test pin (fixed at Low during normal operations)
27 27 E3 DCLK/P31 I/O O（H）On-chip debugger clock output pin* / input/output port pin
28 28 E2 DST2/P32 I/O O（L）On-chip debugger status output pin* / input/output port pin
29 29 E1 DSIO/P33 I/O I(Pull-Up）On-chip debugger data input/output pin*/ input/output port pin
30 30 D2 VSS - - Power supply pin (GND)
31 31 D1 LVDD - - Power supply pin (LVDD+)
32 32 D3 P14/SDA I/O I(Pull-Up）Input/output port pin (with interrupt)*/ I2C data input/output
pin
33 33 C1 P15/SCL I/O I(Pull-Up）Input/output port pin (with interrupt)*/ I2C clock output pin
34 34 C2 P16/EXCL0 I/O I(Pull-Up）Input/output port pin (with interrupt)*/ T16 Ch.0 external clock
input pin
35 35 B1 P07/EXCL1 I/O I(Pull-Up）Input/output port pin (with interrupt)*/ T16 Ch.1 external clock
input pin
36 36 B2 P06/EXCL2 I/O I(Pull-Up）Input/output port pin (with interrupt)*/ T16 Ch.2 external clock
input pin
Note: Pins appearing in bold and functions indicated by “*” are default settings.
2 CPU
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 7
2 CPU
The S1C17001 uses an S1C17 core as the core processor.
The S1C17 core is an original Seiko Epson 16-bit RISC processor.
It features low power consumption, high-speed operation, wide address space, main command single-clock execu-
tion, and gate-saving design. It is ideal for use in controllers or sequencers, in which 8-bit CPUs are widely used.
For detailed information on the S1C17 core, refer to the S1C17 Family S1C17 Core Manual.
2.1 S1C17 Core Features
Processor type
• Seiko Epson original 16-bit RISC processor
• 0.35 µm to 0.15 µm low-power CMOS process technology
Command set
• Code length Fixed 16-bit length
• Number of commands 111 basic commands (184 in total)
• Execution cycle Main commands executed in one cycle
• Immediate expansion commands Expansion of immediate to 24 bits
• Compact, high-speed command set optimized for development with C
Register set
• 24-bit general purpose register x 8
• 24-bit special register x 2
• 8-bit special register x 1
Memory space, buses
• Up to 16 Mbytes of memory space (24-bit address)
• Harvard architecture with separate command bus (16-bit) and data bus (32-bit)
Interrupt
• Supports reset, NMI, and 32 different types of external interrupt
• Irregular address interrupt
• Debug interrupt
• Reading vector from vector table and direct branching to interrupt processing routines
• Permits software interrupts using vector numbers (all vector numbers can be specified)
Power saving
• HALT (halt command)
• SLEEP (slp command)
2 CPU
8 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
2.2 CPU Registers
The S1C17 core contains eight general purpose registers and three special registers.
R4
R5
R6
R7
R3
R2
R1
R0
PC 7
6
5
4
3
2
1
0
PSR
SP
IL[2:0]
7 6 5
IE
4
C
3
V
2
Z
1
N
0
Bit 23 Bit 0
General purpose registers
Bit 23 Bit 0
Special registers
Figure 2.2.1: Registers
2 CPU
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 9
2.3 Command Set
The S1C17 core command codes are all 16-bit and fixed-length. Major commands are executed in a single cycle
using pipeline processing. For more information on the various commands, refer to the S1C17 Family S1C17 Core
Manual.
Table 2.3.1: S1C17 core command list
Type Mnemonic Function
Data transfer ld.b %rd,%rs General purpose register (byte) ➔ General purpose register (sign extension)
%rd,[%rb] Memory (byte) ➔ General purpose register (sign extension)
Memory address post-increment/post-decrement
A pre-decrement function can be used
%rd,[%rb]+
%rd,[%rb]-
%rd,-[%rb]
%rd,[%sp+imm7] Stack (byte) ➔ General purpose register (sign extension)
%rd,[imm7] Memory (byte) ➔ General purpose register (sign extension)
[%rb],%rs General purpose register (byte) ➔ Memory
Memory address post-increment/post-decrement
A pre-decrement function can be used
[%rb]+,%rs
[%rb]-,%rs
-[%rb],%rs
[%sp+imm7],%rs General purpose register (byte) ➔ Stack
[imm7],%rs General purpose register (byte) ➔ Memory
ld.ub %rd,%rs General purpose register (byte) ➔ General purpose register (zero extension)
%rd,[%rb] Memory (byte) ➔ General purpose register (zero extension)
Memory address post-increment/post-decrement
A pre-decrement function can be used
%rd,[%rb]+
%rd,[%rb]-
%rd,-[%rb]
%rd,[%sp+imm7] Stack (byte) ➔ General purpose register (zero extension)
%rd,[imm7] Memory (byte) ➔ General purpose register (zero extension)
ld %rd,%rs General purpose register (16 bits) ➔ General purpose register
%rd,sign7 Immediate ➔ General purpose register (sign extension)
%rd,[%rb] Memory (16 bits) ➔ General purpose register
Memory address post-increment/post-decrement
A pre-decrement function can be used
%rd,[%rb]+
%rd,[%rb]-
%rd,-[%rb]
%rd,[%sp+imm7] Stack (16 bits) ➔ General purpose register
%rd,[imm7] Memory (16 bits) ➔ General purpose register
[%rb],%rs General purpose register (16 bits) ➔ Memory
Memory address post-increment/post-decrement
A pre-decrement function can be used
[%rb]+,%rs
[%rb]-,%rs
-[%rb],%rs
[%sp+imm7],%rs General purpose register (16 bits) ➔ Stack
[imm7],%rs General purpose register (16 bits) ➔ Memory
ld.a %rd,%rs General purpose register (24 bits) ➔ General purpose register
%rd,imm7 Immediate ➔ General purpose register (zero extension)
%rd,[%rb] Memory (32 bits) ➔ General purpose register (*1)
Memory address post-increment/post-decrement
A pre-decrement function can be used
%rd,[%rb]+
%rd,[%rb]-
%rd,-[%rb]
%rd,[%sp+imm7] Stack (32 bits) ➔ General purpose register (*1)
%rd,[imm7] Memory (32 bits) ➔ General purpose register (*1)
[%rb],%rs General purpose register (32 bits, zero extension) ➔ Memory (*1)
Memory address post-increment/post-decrement
A pre-decrement function can be used
[%rb]+,%rs
[%rb]-,%rs
-[%rb],%rs
[%sp+imm7],%rs General purpose register (32 bits, zero extension) ➔ Stack (*1)
[imm7],%rs General purpose register (32 bits, zero extension) ➔ Memory (*1)
%rd,%sp SP ➔ General purpose register
%rd,%pc PC ➔ General purpose register
%rd,[%sp] Stack (32 bits) ➔ General purpose register (*1)
Stack pointer post-increment/post-decrement
A pre-decrement function can be used
%rd,[%sp]+
%rd,[%sp]-
%rd,-[%sp]
2 CPU
10 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
Type Mnemonic Function
Data transfer ld.a [%sp],%rs General purpose register (32 bits, zero extension) ➔ Stack (*1)
Stack pointer post-increment/post-decrement
A pre-decrement function can be used
[%sp]+,%rs
[%sp]-,%rs
-[%sp],%rs
%sp,%rs General purpose register (24 bits) ➔ SP
%sp,imm7 Immediate ➔ SP
Integer arithmetic add %rd,%rs Adds 16 bits between general purpose registers
Supports conditional execution (/c: Executed when C = 1, /nc: Executed when
C = 0)
add/c
add/nc
add %rd,imm7 Adds general purpose register and immediate 16 bits
add.a %rd,%rs Adds 24 bits between general purpose registers
Supports conditional execution (/c: Executed when C = 1, /nc: Executed when
C = 0)
add.a/c
add.a/nc
add.a %sp,%rs Adds SP and general purpose register 24 bits
%rd,imm7 Adds general purpose register and immediate 24 bits
%sp,imm7 Adds SP and immediate 24 bits
adc %rd,%rs Adds 16 bits with carry between general purpose registers
Supports conditional execution (/c: Executed when C = 1, /nc: Executed when
C = 0)
adc/c
adc/nc
adc %rd,imm7 Adds general purpose register and immediate 16 bits with carry
sub %rd,%rs Subtracts 16 bits between general purpose registers
Supports conditional execution (/c: Executed when C = 1, /nc: Executed when
C = 0)
sub/c
sub/nc
sub %rd,imm7 Subtracts general purpose register and immediate 16 bits
sub.a %rd,%rs Subtracts 24 bits between general purpose registers
Supports conditional execution (/c: Executed when C = 1, /nc: Executed when
C = 0)
sub.a/c
sub.a/nc
sub.a %sp,%rs Subtracts SP and general purpose register 24 bits
%rd,imm7 Subtracts general purpose register and immediate 24 bits
%sp,imm7 Subtracts SP and immediate 24 bits
sbc %rd,%rs Subtracts 16 bits with carry between general purpose registers
Supports conditional execution (/c: Executed when C = 1, /nc: Executed when
C = 0)
sbc/c
sbc/nc
sbc %rd,imm7 Subtracts general purpose register and immediate 16 bits with carry
cmp %rd,%rs Compares 16 bits between general purpose registers
Supports conditional execution (/c: Executed when C = 1, /nc: Executed when
C = 0)
cmp/c
cmp/nc
cmp %rd,sign7 Compares general purpose registers and immediate 16 bits
cmp.a %rd,%rs Compares 24 bits between general purpose registers
Supports conditional execution (/c: Executed when C = 1, /nc: Executed when
C = 0)
cmp.a/c
cmp.a/nc
cmp.a %rd,imm7 Compares general purpose registers and immediate 24 bits
cmc %rd,%rs Compares 16 bits with carry between general purpose registers
Supports conditional execution (/c: Executed when C = 1, /nc: Executed when
C = 0)
cmc/c
cmc/nc
cmc %rd,sign7 Compares general purpose register and immediate 16 bits with carry
Logic operations and %rd,%rs AND operation between general purpose registers
Supports conditional execution (/c: Executed when C = 1, /nc: Executed when
C = 0)
and/c
and/nc
and %rd,sign7 AND operation for general purpose register and immediate
or %rd,%rs OR operation between general purpose registers
Supports conditional execution (/c: Executed when C = 1, /nc: Executed when
C = 0)
or/c
or/nc
or %rd,sign7 OR operation for general purpose register and immediate
xor %rd,%rs EXCLUSIVE OR between general purpose registers
Supports conditional execution (/c: Executed when C = 1, /nc: Executed when
C = 0)
xor/c
xor/nc
xor %rd,sign7 EXCLUSIVE OR for general purpose register and immediate
not %rd,%rs NOT operation between general purpose registers (1 complement)
Supports conditional execution (/c: Executed when C = 1, /nc: Executed when
C = 0)
not/c
not/nc
not %rd,sign7 NOT operation for general purpose register and immediate (1 complement)
2 CPU
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 11
Type Mnemonic Function
Shift & swap sr %rd,%rs Right logic shift (shift bit number specified by register)
%rd,imm7 Right logic shift (shift bit number specified by immediate)
sa %rd,%rs Right operation shift (shift bit number specified by register)
%rd,imm7 Right operation shift (shift bit number specified by immediate)
sl %rd,%rs Left logic shift (shift bit number specified by register)
%rd,imm7 Left logic shift (shift bit number specified by immediate)
swap %rd,%rs Byte swap at 16-bit boundary
Immediate extension
ext imm13 Extend operand for next command
Conversion cv.ab %rd,%rs Convert 8-bit coded data to 24 bits
cv.as %rd,%rs Convert 16-bit coded data to 24 bits
cv.al %rd,%rs Convert 32-bit data to 24 bits
cv.la %rd,%rs Convert 24-bit data to 32 bits
cv.ls %rd,%rs Convert 16-bit data to 32 bits
Branch jpr
jpr.d
sign10 PC-relative jump
Allows delayed branching
%rb
jpa
jpa.d
imm7 Absolute jump
Allows delayed branching
%rb
jrgt
jrgt.d
sign7 Conditional PC-relative jump Branch conditions: !Z & !(N ^ V)
Allows delayed branching
jrge
jrge.d
sign7 Conditional PC-relative jump Branch conditions: !(N ^ V)
Allows delayed branching
jrlt
jrlt.d
sign7 Conditional PC-relative jump Branch conditions: N ^ V
Allows delayed branching
jrle
jrle.d
sign7 Conditional PC-relative jump Branch conditions: Z | N ^ V
Allows delayed branching
jrugt
jrugt.d
sign7 Conditional PC-relative jump Branch conditions: !Z & !C
Allows delayed branching
jruge
jruge.d
sign7 Conditional PC-relative jump Branch conditions: !C
Allows delayed branching
jrult
jrult.d
sign7 Conditional PC-relative jump Branch conditions: C
Allows delayed branching
jrule
jrule.d
sign7 Conditional PC-relative jump Branch conditions: Z | C
Allows delayed branching
jreq
jreq.d
sign7 Conditional PC-relative jump Branch conditions: Z
Allows delayed branching
jrne
jrne.d
sign7 Conditional PC-relative jump Branch conditions: !Z
Allows delayed branching
call
call.d
sign10 PC-relative subroutine call
Allows delayed branching
%rb
calla
calla.d
imm7 Absolute subroutine call
Allows delayed branching
%rb
ret
ret.d
Return from subroutine
Allows delayed branching
int imm5 Software interrupt
intl imm5,imm3 Software interrupt with interrupt level specification
reti
reti.d
Return from interrupt
Allows delayed branching
brk Debug interrupt
retd Return from debug processing
System control nop No operation
halt HALT
slp SLEEP
ei Permits interrupt
di Prevents interrupt
*1: Command ld.a accesses 32-bit memory. When data is transferred from register to memory, 32 bits of data with
the first 8 bits set to 0 are written to memory. When data is read from memory, the first 8 bits are ignored.
*2: Coprocessor commands are reserved, since the S1C17001 does not include a coprocessor.
2 CPU
12 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
The codes used in this table are explained below.
Table 2.3.2: Code meanings
Code Description
%rs General purpose source register
%rd General purpose destination register
[%rb]Memory specified indirectly by general purpose register
[%rb]+ Memory specified indirectly by general purpose register (with address post-
increment)
[%rb]- Memory specified indirectly by general purpose register (with address post-
decrement)
-[%rb]Memory specified indirectly by general purpose register (with address pre-
decrement)
%sp Stack pointer
[%sp],[%sp+imm7]Stack
[%sp]+ Stack (with address post-increment)
[%sp]- Stack (with address post-decrement)
-[%sp] Stack (with address pre-decrement)
imm3,imm5,imm7,imm13 Immediate without code (number indicates bit length)
sign7,sign10 Immediate with code (number indicates bit length)
2 CPU
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 13
2.4 Vector Table
The vector table contains the vectors (processing routine start addresses) for interrupt processing routines. When an
interrupt occurs, the S1C17 core reads the vector corresponding to the interrupt and executes that processing routine.
The boot address for starting program execution must be written at the top of the vector table after resetting.
The S1C17001 vector table starts from address 0x8000. The vector table base address can be read from the TTBR
(vector table base register) at address 0xffff80.
Table 2.4.1 shows the S1C17001 vector table.
Table 2.4.1: Vector table
Vector No./ Soft-
ware interrupt No. Vector address Hardware interrupt name Hardware interrupt factor Priority
0 (0x00) 0x8000 Reset • Low input to #RESET pin
• Watchdog timer overflow *2
1
1 (0x01) 0x8004 Irregular address interrupt Memory access command 2
– (0xfffc00) Debug interrupt brk command etc. 3
2 (0x02) 0x8008 NMI Watchdog timer overflow *2 4
3 (0x03) 0x800c reserved – –
4 (0x04) 0x8010 P0 port interrupt P00 to P07 port input High *1
5 (0x05) 0x8014 P1 port interrupt P10 to P17 port input
6 (0x06) 0x8018 Stopwatch timer interrupt • Timer 100 Hz signal
• Timer 10 Hz signal
• Timer 1 Hz signal
7 (0x07) 0x801c Clock timer interrupt • Timer 32 Hz signal
• Timer 8 Hz signal
• Timer 2 Hz signal
• Timer 1 Hz signal
8 (0x08) 0x8020 8-bit OSC1 timer interrupt Compare match
9 (0x09) 0x8024 reserved –
10 (0x0a) 0x8028
11 (0x0b) 0x802c PWM & capture timer interrupt • Compare A
• Compare B
12 (0x0c) 0x8030 8-bit timer interrupt Timer underflow
13 (0x0d) 0x8034 16-bit timer Ch.0 interrupt Timer underflow
14 (0x0e) 0x8038 16-bit timer Ch.1 interrupt Timer underflow
15 (0x0f) 0x803c 16-bit timer Ch.2 interrupt Timer underflow
16 (0x10) 0x8040 UART interrupt • Transmit buffer empty
• Receive buffer full
• Receive error
17 (0x11) 0x8044 Remote controller interrupt • Data length counter underflow
• Input rising edge detection
• Input falling edge detection
18 (0x12) 0x8048 SPI interrupt • Transmit buffer empty
• Receive buffer full
19 (0x13) 0x804c I2C interrupt • Transmit buffer empty
• Receive buffer full
20 (0x14) 0x8050
: : reserved –
31 (0x1f) 0x807c Low *1
*1: When same interrupt level is set
*2: Watchdog timer interrupt selects reset or NMI using software.
0xffff80: Vector Table Base Register (TTBR)
Register name Address Bit Name Function Setting Init. R/W Remarks
Vector Table
Base Register
(TTBR)
0xffff80
(32 bits)
D31–24 –Unused (fixed at 0) 0x0 0x0 R
D23–0 TTBR[23:0] Vector table base address 0x8000 0x80
00
R
2 CPU
14 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
2.5 Processor Information
The S1C17001 contains a processor ID register (0xffff84) to allow specification of the CPU core type by the appli-
cation software.
0xffff84: Processor ID Register (IDIR)
Register name Address Bit Name Function Setting Init. R/W Remarks
Processor ID
Register
(IDIR)
0xffff84
(8 bits)
D7–0 IDIR[7:0] Processor ID
0x10: S1C17 Core
0x10 0x10 R
This is the read-only register containing the ID code indicating the processor type. The S1C17 core ID code is
0x10.
3 MEMORY MAP AND BUS CONTROL
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 15
3 Memory Map and Bus Control
Figure 3.1 shows the S1C17001 memory map.
Internal ROM area
(32 Kbytes, 1-5 cycles)
(Device size: 16 bits)
Vector table
Internal peripheral circuit area 2
(4 Kbytes, 3 cycles)
Internal peripheral circuit area 1
(1 Kbyte, 1 cycle)
Core I/O reserved area
(1 Kbyte, 1 cycle)
reserved
reserved
reserved
reserved
0xff ffff
0xff fc00
0xff fbff
0x01 0000
0x00 ffff
0x00 8000
0x00 7fff
0x00 6000
0x00 5fff
0x00 5000
0x00 4fff
0x00 4400
0x00 43ff
0x00 4000
0x00 3fff
0x00 0800
0x00 07ff
0x00 07c0
0x00 0000
Debug RAM area (64 bytes)
Internal RAM area
(2 Kbytes, 1 cycle)
(Device size: 32 bits)
0x4360~0x43ff
0x4340~0x435f
0x4320~0x433f
0x4300~0x431f
0x4280~0x42ff
0x4260~0x427f
0x4240~0x425f
0x4220~0x423f
0x4200~0x421f
0x4120~0x41ff
0x4100~0x411f
0x4040~0x40ff
0x4020~0x403f
0x4000~0x401f
reserved
I2C
SPI
Interrupt controller
reserved
16-bit timer Ch.2
16-bit timer Ch.1
16-bit timer Ch.0
8-bit timer
reserved
UART
reserved
Prescaler
reserved
0x5360~0x5fff
0x5340~0x535f
0x5320~0x533f
0x5300~0x531f
0x52c0~0x52ff
0x52a0~0x52bf
0x5280~0x529f
0x5200~0x527f
0x50e0~0x51ff
0x50c0~0x50df
0x50a0~0x50bf
0x5080~0x509f
0x5060~0x507f
0x5040~0x505f
0x5020~0x503f
0x5000~0x501f
reserved
Remote controller
MISC register
PWM & capture timer
reserved
Port MUX
reserved
P port
reserved
8-bit OSC1 timer
reserved
Clock generator
Oscillator circuit
Watchdog timer
Stopwatch timer
Clock timer
_
(8 bits)
(8 bits)
(16 bits)
_
(8 bits)
_
(8 bits)
_
(8 bits)
_
(8 bits)
(8 bits)
(8 bits)
(8 bits)
(8 bits)
(16 bits)
(16 bits)
(16 bits)
(16 bits)
(16 bits)
(16 bits)
(16 bits)
(16 bits)
(16 bits)
(8 bits)
(8 bits)
(8 bits)
(8 bits)
(8 bits)
Peripheral functions (Device size)
Figure 3.1: S1C17001 memory map
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16 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
3.1 Bus Cycle
The CPU operates using CCLK as a datum. For more information on CCLK, refer to “8.2 CPU Core Clock (CCLK)
Control.”
The time from one CCLK rise-up to the next forms 1 CCLK, defined as one bus cycle. As shown in Figure 3.1, the
number of cycles required for a single bus access depends on the peripheral circuits and memory. The number of
bus accesses also varies and depends on the CPU command (access size) and device size.
Table 3.1.1: Bus access numbers
Device size CPU access size Bus access number
8 bits 8 bits 1
16 bits 2
32 bits * 4
16 bits 8 bits 1
16 bits 1
32 bits * 2
32 bits 8 bits 1
16 bits 1
32 bits * 1
* First 8 bits of data for 32-bit data access
The first 8 bits of 32-bit data are written to memory as 0. The first 8 bits are ignored when read from memory. In-
terrupt processing stack operation involves reading and writing 32 bits with the PSR value in the first 8 bits and
the return address in the last 24 bits.
Bus cycle calculation example
Number of bus cycles when accessing internal peripheral circuit area 2 (8-bit device, 3 cycles) from CPU using
16-bit read/write command:
3 cycles x 2 bus accesses = 6 CCLK cycles
3.1.1 Access Size Restrictions
When programming, note that the modules listed below are subject to access size restrictions.
SPI, I2C
The SPI and I2C registers can be accessed only with 16-bit read/write commands.
All other modules can be accessed using 8-bit, 16-bit, and 32-bit commands. Where possible, we recommend
matching access to device size. Reading from non-essential registers may alter the state of peripheral circuits and
cause problems.
3.1.2 Command Execution Cycle Restrictions
In the event of any of the conditions listed below, command fetch and data access will not be performed simultane-
ously, and the command fetch cycle will be extended by the amount of access cycles for the areas in which data ex-
ists.
• If a command is executed for an internal ROM area while accessing internal ROM and internal peripheral circuit
area 2 (0x5000 onward) data
• If a command is executed for an internal RAM area while accessing internal RAM area data
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S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 17
3.2 Internal ROM Area
3.2.1 Internal ROM
The 32 Kbyte area from address 0x8000 to 0xffff is ROM. This area can be used for writing application programs
and data. Address 0x8000 is defined as the vector table base address, and the vector table must be placed at the start
of this area (refer to “2.4 Vector Table”). ROM reads take 1 to 5 cycles.
3.2.2 ROM Read Access Cycle Settings
Set the IROM area read access cycles using FLCYC[2:0] (D[2:0]/MISC_FL register) to retain compatibility with
S1C17701. Normally, set FLCYC[2:0] to 0x4.
0x5320: ROM Control Register (MISC_FL)
Register name Address Bit Name Function Setting Init. R/W Remarks
ROM
Control Register
(MISC_FL)
0x5320
(8 bits)
D7–3 –reserved – – – 0 when being read.
D2–0 FLCYC[2:0] ROM read access cycle FLCYC[2:0] Read cycle 0x3 R/W
0x7–0x5
0x4
0x3
0x2
0x1
0x0
reserved
1 cycle
5 cycles
4 cycles
3 cycles
2 cycles
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3.3 Internal RAM Area
3.3.1 Internal RAM
The 2 Kbyte area from address 0x0 to 0x7ff is RAM. This RAM can be accessed in one cycle. In addition to storing
variables, it can also be used to copy command codes and execute them rapidly in RAM.
Note: The last 64 bytes of the internal RAM (0x7c0 to 0x7ff) are reserved for on-chip debugging. This
area should not be accessed by application programs when using debug functions (for exam-
ple, during application development).
It can be used for applications in mass-produced products that do not require debugging.
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3.4 Internal Peripheral Circuit Area
The 1 Kbyte area starting at address 0x4000 and the 4 Kbyte area from 0x5000 are assigned for use as internal pe-
ripheral circuit I/O and control registers.
3.4.1 Internal Peripheral Circuit Area 1 (0x4000 onward)
The internal peripheral circuit area 1 starting at address 0x4000 is assigned for use as the following internal periph-
eral function I/O memory and can be accessed in a single cycle.
• Prescaler (PSC, 8-bit device)
• UART (UART, 8-bit device)
• 8-bit timer (T8F, 16-bit device)
• 16-bit timer (T16, 16-bit device)
• Interrupt controller (ITC, 16-bit device)
• SPI (SPI, 16-bit device)
• I2C (I2C, 16-bit device)
3.4.2 Internal Peripheral Circuit Area 2 (0x5000 onward)
The internal peripheral circuit area 2 starting at address 0x5000 is assigned for use as the following internal periph-
eral function I/O memory, and can be accessed in three cycles.
• Clock timer (CT, 8-bit device)
• Stopwatch timer (SWT, 8-bit device)
• Watchdog timer (WDT, 8-bit device)
• Oscillator circuit (OSC, 8-bit device)
• Clock generator (CLG, 8-bit device)
• 8-bit OSC1 timer (T8OSC1, 8-bit device)
• Input/output port & port MUX (P, 8-bit device)
• PWM & capture timer (T16E, 16-bit device)
• MISC register (MISC, 8-bit device)
• Remote controller (REMC, 8-bit device)
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3.4.3 I/O Map
The I/O map for the internal peripheral circuit area is shown below. For more information on control registers, refer
to the I/O register list in the Appendix or the corresponding peripheral circuit explanations.
Note: Addresses indicated as “Reserved” or blank unused peripheral circuit areas should not be ac-
cessed by application programs.
Table 3.4.3.1: I/O map (internal peripheral circuit area 1)
Peripheral circuit
Address Register name Function
Prescaler
(8-bit device)
0x4020 PSC_CTL Prescaler Control Register Prescaler start/stop control
0x4021 to 0x403f – – Reserved
UART (with IrDA)
(8-bit device)
0x4100 UART_ST UART Status Register Transfer, buffer, and error status display
0x4101 UART_TXD UART Transmit Data Register Transmission data
0x4102 UART_RXD UART Receive Data Register Received data
0x4103 UART_MOD UART Mode Register Transfer data format setting
0x4104 UART_CTL UART Control Register Data transfer control
0x4105 UART_EXP UART Expansion Register IrDA mode setting
0x4106 to 0x411f – – Reserved
8-bit timer
(with F mode)
(16-bit device)
0x4200 T8F_CLK 8-bit Timer Input Clock Select Register Prescaler output clock selection
0x4202 T8F_TR 8-bit Timer Reload Data Register Reload data setting
0x4204 T8F_TC 8-bit Timer Counter Data Register Counter data
0x4206 T8F_CTL 8-bit Timer Control Register Timer mode setting and timer RUN/STOP
0x4208 to 0x421f – – Reserved
16-bit timer Ch.0
(16-bit device)
0x4220 T16_CLK0 16-bit Timer Ch.0 Input Clock Select Register Prescaler output clock selection
0x4222 T16_TR0 16-bit Timer Ch.0 Reload Data Register Reload data setting
0x4224 T16_TC0 16-bit Timer Ch.0 Counter Data Register Counter data
0x4226 T16_CTL0 16-bit Timer Ch.0 Control Register Timer mode setting and timer RUN/STOP
0x4228 to 0x423f – – Reserved
16-bit timer Ch.1
(16-bit device)
0x4240 T16_CLK1 16-bit Timer Ch.1 Input Clock Select Register Prescaler output clock selection
0x4242 T16_TR1 16-bit Timer Ch.1 Reload Data Register Reload data setting
0x4244 T16_TC1 16-bit Timer Ch.1 Counter Data Register Counter data
0x4246 T16_CTL1 16-bit Timer Ch.1 Control Register Timer mode setting and timer RUN/STOP
0x4248 to 0x425f – – Reserved
16-bit timer Ch.2
(16-bit device)
0x4260 T16_CLK2 16-bit Timer Ch.2 Input Clock Select Register Prescaler output clock selection
0x4262 T16_TR2 16-bit Timer Ch.2 Reload Data Register Reload data setting
0x4264 T16_TC2 16-bit Timer Ch.2 Counter Data Register Counter data
0x4266 T16_CTL2 16-bit Timer Ch.2 Control Register Timer mode setting and timer RUN/STOP
0x4268 to 0x427f – – Reserved
Interrupt
controller
(16-bit device)
0x4300 ITC_IFLG Interrupt Flag Register Interrupt occurrence status display/reset
0x4302 ITC_EN Interrupt Enable Register Maskable interrupt permission/prohibition
0x4304 ITC_CTL ITC Control Register ITC operation permission/prohibition
0x4306 ITC_ELV0 External Interrupt Level Setup Register 0 P0/P1 port interrupt level and trigger mode
setting
0x4308 ITC_ELV1 External Interrupt Level Setup Register 1 Stopwatch timer and clock timer interrupt
level and trigger mode setting
0x430a ITC_ELV2 External Interrupt Level Setup Register 2 8-bit OSC1 timer interrupt level and trigger
mode setting
0x430c ITC_ELV3 External Interrupt Level Setup Register 3 PWM & capture timer interrupt level and
trigger mode setting
0x430e ITC_ILV0 Internal Interrupt Level Setup Register 0 8-bit timer and 16-bit timer Ch.0 interrupt
level setting
0x4310 ITC_ILV1 Internal Interrupt Level Setup Register 1 16-bit timer Ch.1 and 16-bit timer Ch.2
interrupt level setting
0x4312 ITC_ILV2 Internal Interrupt Level Setup Register 2 UART and remote controller interrupt level
setting
0x4314 ITC_ILV3 Internal Interrupt Level Setup Register 3 SPI and I2C interrupt level setting
0x4316 to 0x431f – – Reserved
SPI
(16-bit device)
0x4320 SPI_ST SPI Status Register Transfer and buffer status display
0x4322 SPI_TXD SPI Transmit Data Register Transmission data
0x4324 SPI_RXD SPI Receive Data Register Received data
0x4326 SPI_CTL SPI Control Register SPI mode and data transfer permission
setting
0x4328 to 0x433f – – Reserved
I2C
(16-bit device)
0x4340 I2C_EN I2C Enable Register I2C module enable
0x4342 I2C_CTL I2C Control Register I2C control and transfer status display
0x4344 I2C_DAT I2C Data Register Transfer data
0x4346 I2C_ICTL I2C Interrupt Control Register I2C interrupt control
0x4348 to 0x435f – – Reserved
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Table 3.4.3.2: I/O map (internal peripheral circuit area 2)
Peripheral circuit
Address Register name Function
Clock timer
(8-bit device)
0x5000 CT_CTL Clock Timer Control Register Timer reset and RUN/STOP control
0x5001 CT_CNT Clock Timer Counter Register Counter data
0x5002 CT_IMSK Clock Timer Interrupt Mask Register Interrupt mask setting
0x5003 CT_IFLG Clock Timer Interrupt Flag Register Interrupt occurrence status display/reset
0x5004 to 0x501f – – Reserved
Stopwatch timer
(8-bit device)
0x5020 SWT_CTL Stopwatch Timer Control Register Timer reset and RUN/STOP control
0x5021 SWT_BCNT Stopwatch Timer BCD Counter Register BCD Counter data
0x5022 SWT_IMSK Stopwatch Timer Interrupt Mask Register Interrupt mask setting
0x5023 SWT_IFLG Stopwatch Timer Interrupt Flag Register Interrupt occurrence status display/reset
0x5024 to 0x503f – – Reserved
Watchdog timer
(8-bit device)
0x5040 WDT_CTL Watchdog Timer Control Register Timer reset and RUN/STOP control
0x5041 WDT_ST Watchdog Timer Status Register Timer mode setting and NMI status display
0x5042 to 0x505f – – Reserved
Oscillator circuit
(8-bit device)
0x5060 OSC_SRC Clock Source Select Register Clock source selection
0x5061 OSC_CTL Oscillation Control Register Oscillation control
0x5062 OSC_NFEN Noise Filter Enable Register Noise filter ON/OFF
0x5063 – – Reserved
0x5064 OSC_FOUT FOUT Control Register Clock external output control
0x5065 OSC_T8OSC1 T8OSC1 Clock Control Register 8-bit OSC1 timer clock setting
0x5066 to 0x507f – – Reserved
Clock generator
(8-bit device)
0x5080 CLG_PCLK PCLK Control Register PCLK feed control
0x5081 CLG_CCLK CCLK Control Register CCLK division ratio setting
0x5082 to 0x509f – – Reserved
8-bit OSC1 timer
(8-bit device)
0x50c0 T8OSC1_CTL 8-bit OSC1 Timer Control Register Timer mode setting and timer RUN/STOP
0x50c1 T8OSC1_CNT 8-bit OSC1 Timer Counter Data Register Counter data
0x50c2 T8OSC1_CMP 8-bit OSC1 Timer Compare Data Register Compare data setting
0x50c3 T8OSC1_IMSK 8-bit OSC1 Timer Interrupt Mask Register Interrupt mask setting
0x50c4 T8OSC1_IFLG 8-bit OSC1 Timer Interrupt Flag Register Interrupt occurrence status display/reset
0x50c5 to 0x50df – – Reserved
P port & port
MUX
(8-bit device)
0x5200 P0_IN P0 Port Input Data Register P0 port input data
0x5201 P0_OUT P0 Port Output Data Register P0 port output data
0x5202 P0_IO P0 Port I/O Direction Control Register P0 port input/output direction selection
0x5203 P0_PU P0 Port Pull-up Control Register P0 port pull-up control
0x5204 – – Reserved
0x5205 P0_IMSK P0 Port Interrupt Mask Register P0 port interrupt mask setting
0x5206 P0_EDGE P0 Port Interrupt Edge Select Register P0 port interrupt edge selection
0x5207 P0_IFLG P0 Port Interrupt Flag Register P0 port interrupt occurrence status display/
reset
0x5208 P0_CHAT P0 Port Chattering Filter Control Register P0 port chattering filter control
0x5209 P0_KRST P0 Port Key-Entry Reset Configuration Regis-
ter
P0 port key entry reset setting
0x520a to 0x520f – – Reserved
0x5210 P1_IN P1 Port Input Data Register P1 port input data
0x5211 P1_OUT P1 Port Output Data Register P1 port output data
0x5212 P1_IO P1 Port I/O Direction Control Register P1 port input/output direction selection
0x5213 P1_PU P1 Port Pull-up Control Register P1 port pull-up control
0x5214 – – Reserved
0x5215 P1_IMSK P1 Port Interrupt Mask Register P1 port interrupt mask setting
0x5216 P1_EDGE P1 Port Interrupt Edge Select Register P1 port interrupt edge selection
0x5217 P1_IFLG P1 Port Interrupt Flag Register P1 port interrupt occurrence status display/
reset
0x5218 to 0x521f – – Reserved
0x5220 P2_IN P2 Port Input Data Register P2 port input data
0x5221 P2_OUT P2 Port Output Data Register P2 port output data
0x5222 P2_IO P2 Port I/O Direction Control Register P2 port input/output direction selection
0x5223 P2_PU P2 Port Pull-up Control Register P2 port pull-up control
0x5224 to 0x522f – – Reserved
0x5230 P3_IN P3 Port Input Data Register P3 port input data
0x5231 P3_OUT P3 Port Output Data Register P3 port output data
0x5232 P3_IO P3 Port I/O Direction Control Register P3 port input/output direction selection
0x5233 P3_PU P3 Port Pull-up Control Register P3 port pull-up control
0x5234 to 0x527f – – Reserved
0x52a0 P0_PMUX P0 Port Function Select Register P0 port function selection
0x52a1 P1_PMUX P1 Port Function Select Register P1 port function selection
0x52a2 P2_PMUX P2 Port Function Select Register P2 port function selection
0x52a3 P3_PMUX P3 Port Function Select Register P3 port function selection
0x52a4 to 0x52bf – – Reserved
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22 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
Peripheral circuit
Address Register name Function
PWM & capture
timer
(16-bit device)
0x5300 T16E_CA PWM Timer Compare Data A Register Compare data A setting
0x5302 T16E_CB PWM Timer Compare Data B Register Compare data B setting
0x5304 T16E_TC PWM Timer Counter Data Register Counter data
0x5306 T16E_CTL PWM Timer Control Register Timer mode setting and timer RUN/STOP
0x5308 T16E_CLK PWM Timer Input Clock Select Register Prescaler output clock selection
0x530a T16E_IMSK PWM Timer Interrupt Mask Register Interrupt mask setting
0x530c T16E_IFLG PWM Timer Interrupt Flag Register Interrupt occurrence status display/reset
0x530e to 0x531f – – Reserved
MISC register (8-
bit device)
0x5320 MISC_FL ROM Control Register ROM access condition setting
0x5321 – – Reserved
0x5322 MISC_OSC1 OSC1 Peripheral Control Register OSC1 operation peripheral function setting
for debugging
0x5323 to 0x533f – – Reserved
Remote controller
(8-bit device)
0x5340 REMC_CFG REMC Configuration Register Transfer selection and permission
0x5341 REMC_PSC REMC Prescaler Clock Select Register Prescaler output clock selection
0x5342 REMC_CARH REMC H Carrier Length Setup Register Carrier H section length setting
0x5343 REMC_CARL REMC L Carrier Length Setup Register Carrier L section length setting
0x5344 REMC_ST REMC Status Register Transfer bit
0x5345 REMC_LCNT REMC Length Counter Register Transfer data length setting
0x5346 REMC_IMSK REMC Interrupt Mask Register Interrupt mask setting
0x5347 REMC_IFLG REMC Interrupt Flag Register Interrupt occurrence status display/reset
0x5348 to 0x535f – – Reserved
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S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 23
3.5 Core I/O Reserved Area
The 1 Kbyte area from 0xfffc00 to 0xffffff is used as the CPU core I/O area, and the following I/O registers are as-
signed.
Table 3.5.1: I/O map (Core I/O reserved area)
Peripheral circuit
Address Register name Function
S1C17 core I/O 0xffff80 TTBR Vector Table Base Register Vector table base address display
0xffff84 IDIR Processor ID Register Processor ID display
0xffff90 DBRAM Debug RAM Base Register Debugging RAM base address display
For more information on TTBR, refer to “2.4 Vector Table”; and for more information on IDIR, refer to “2.5 Pro-
cessor Information.”
For more information on DBRAM, refer to “22 On-chip Debugging (DBG).”
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4 POWER SUPPLY VOLTAGE
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 25
4PowerSupplyVoltage
The S1C17001 operation power supply voltages are given below.
Core voltage (LVDD): 1.65 V to 2.7 V
I/O voltage (HVDD): 1.65 V to 3.6 V
Supply voltages within the respective ranges to LVDD and HVDD pins with the VSS pin as GND.
The S1C17001 has two LVDD pins, two HVDD pins, and five VSS pins. All must be connected to the + power supply
and GND. None should be left open.
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5 INITIAL RESET
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 27
5 Initial Reset
5.1 Initial Reset Factors
Shown below are the three different initial reset factors for initializing S1C17001 internal circuits.
(1) External initial reset via #RESET pin
(2) External initial reset via P0 port (pins P00 to P03) key entry (set by software)
(3) Internal initial reset via watchdog timer (set by software)
Figure 5.1.1 illustrates the initial reset circuit configuration.
Digital noise
filter
Key reset
control circuit
Chattering filter
circuit
Internal
reset
S
R
Q
#RESET
P00
P01
P02
P03
P0KRST
WDTMD
Watchdog timer
Oscillation stabilization
standby circuit
Figure 5.1.1: Initial reset circuit configuration
The CPU and peripheral circuits are initialized by initial reset factors. The CPU begins reset processing once the
factors are canceled.
This causes the reset vector to be read from the start of the vector table, and the program (initialization routine)
starting at that address to be executed.
5.1.1 #RESET pin
Initial resetting is possible by inputting external Low level to the #RESET pin.
To initialize the S1C17001 reliably, the #RESET pin must be maintained at Low level for at least the specified du-
ration after the power supply voltage rises. (Refer to “24.5 AC Characteristics.”)
Initial resetting is canceled if the #RESET input changes from Low to High, and the CPU begins reset interrupt
processing.
The #RESET pin incorporates a pull-up resistance.
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28 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
5.1.2 P0 Port Key-Entry Reset
Initial resetting is possible by inputting external Low level simultaneously to the ports (P00 to P03) selected by
software. The ports can be selected by P0KRST[1:0] (D[1:0]/P0_KRST register).
* P0KRST[1:0]: P0 Port Key-Entry Reset Configuration Bits in the P0 Port Key-Entry Reset Configuration (P0_
KRST) Register (D[1:0]/0x5209)
Table 5.1.2.1: P0 port key-entry reset settings
P0KRST[1:0] Port used
0x3 P00, P01, P02, P03
0x2 P00, P01, P02
0x1 P00, P01
0x0 Not used
For example, initial reset is applied when input to the four ports P00 to P03 is Low level simultaneously if
P0KRST[1:0] is set to 0x3.
Note: • Make sure the specified ports are not simultaneously switched to Low during normal op-
erations when using the P0 port key-entry reset function.
• The P0 port key-entry reset function is enabled by software and cannot be used to perform
a reset at power-on.
• The P0 port key-entry reset function cannot be used in SLEEP state.
5.1.3 Reset by Watchdog Timer
The S1C17001 incorporates a watchdog timer to detect runaway CPU. If the watchdog timer is not reset by soft-
ware every 4 seconds (with this failure indicating a runaway CPU), the timer overflows, generating an NMI or re-
set. A reset is generated by writing “1” to WDTMD (D1/WDT_ST register). (NMI is generated if WDTMD is 0.)
*WDTMD: NMI/Reset Mode Select Bit in the Watchdog Timer Status (WDT_ST) Register (D1/0x5041)
For detailed information on the watchdog timer, refer to “17 Watchdog Timer (WDT).”
Note: • When using the reset function with the watchdog timer, to prevent accidental resetting, take
care to program so that the watchdog timer is reset every four seconds.
• The watchdog timer reset function is enabled by software and cannot be used to perform a
reset at power-on.
5 INITIAL RESET
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5.2 Initial Reset Sequence
CPU startup waits for the oscillation stabilization standby time (1024/fosc3 seconds*) to expire after resetting is
cancelled via the #RESET pin at power-on. Figure 5.2.1 illustrates the sequence of operations after canceling the
initial reset. The CPU starts up in sync with the OSC3 clock after the reset is canceled.
*fosc3: OSC3 clock frequency
Note: The oscillation stabilization standby time does not include the oscillation start time. The time
may be longer than that shown between power-on or SLEEP cancellation and command ex-
ecution.
Boot vector
Oscillation
stabilization
standby time
Boot operation start
OSC3 clock
#RESET
Reset cancellation
Internal data request
Internal data address
Internal reset
cancellation
Reset
cancellation
Figure 5.2.1: Sequence of operations after initial reset cancellation
5 INITIAL RESET
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5.3 Initial Settings at Initial Resetting
The CPU internal register is initialized by initial resetting, as shown below.
R0 to R7: 0x0
PSR: 0x0 (interrupt level = 0, interrupt prohibited)
SP: 0x0
PC: Reset vector at start of vector table is loaded by reset processing.
The internal RAM and display memory should be initialized via software, since they are not initialized by initial
resetting.
The internal peripheral circuits are initialized in accordance with their particular specifications. They should be
reset via software, if necessary. For detailed information on initial values after initial resetting, refer to the I/O
register list in the Appendix or the respective peripheral circuit descriptions.
6 INTERRUPT CONTROLLER
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6InterruptController
6.1 ITC Configuration
The S1C17001 features the following 14 different types of hardware interrupts:
1. P00 to P07 input interrupt (8 types)
2. P10 to P17 input interrupt (8 types)
3. Stopwatch timer interrupt (3 types)
4. Clock timer interrupt (4 types)
5. 8-bit OSC1 timer interrupt (1 type)
6. PWM & capture timer interrupt (2 types)
7. 8-bit timer interrupt (1 type)
8. 16-bit timer Ch.0 interrupt (1 type)
9. 16-bit timer Ch.1 interrupt (1 type)
10. 16-bit timer Ch.2 interrupt (1 type)
11. UART interrupt (3 types)
12. Remote controller interrupt (3 types)
13. SPI interrupt (2 types)
14. I2C interrupt (2 types)
The various interrupt circuits include interrupt flags to indicate an interrupt request from a neighboring module and
interrupt enable bits to permit/prohibit interrupts. The interrupt level (priority) for determining the processing order
when multiple interrupts occur simultaneously can be set separately for each interrupt circuit.
Each interrupt circuit includes the number of interrupt factors indicated in parentheses above. The respective pe-
ripheral module register controls the specific interrupt factor used to generate the interrupt request to the ITC. For
detailed information on interrupt factors and interrupt factor control, refer to the discussion of the peripheral mod-
ule.
Figure 6.1.1 illustrates the interrupt system configuration.
Interrupt controller
Watchdog timer
Interrupt
request
Interrupt
request
Interrupt flag
Interrupt enable bit
NMI
Interrupt level
Interrupt
control
Vector number
Peripheral module
Interrupt flag
Interrupt enable
Interrupt factor 1
Interrupt flag
Interrupt enable bit
Interrupt level
Vector number
Interrupt flag
Interrupt enable
Interrupt factor n
Interrupt
request
Peripheral module
Interrupt flag
Interrupt enable
Interrupt factor 1
Interrupt flag
Interrupt enable
Interrupt factor n
• • • • •
• • • • • • •
• •
• •
S1C17 core
Debug signal
Reset signal
Interrupt
level
Vector
number
Figure 6.1.1: Interrupt system
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32 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
6.2 Vector Table
The vector table contains the vectors (processing routine start addresses) for interrupt processing routines. When
an interrupt occurs, the S1C17 core reads the vector corresponding to the interrupt and executes that processing
routine. The S1C17001 vector table starts from address 0x8000. The vector table base address can be read from the
TTBR register (0xffff80).
Table 6.2.1 shows the S1C17001 vector table.
Table 6.2.1: Vector table
Vector No./ Soft-
ware interrupt No. Vector address Hardware interrupt name Hardware interrupt factor Priority
0 (0x00) 0x8000 Reset • Low input to #RESET pin
• Watchdog timer overflow *2
1
1 (0x01) 0x8004 Irregular address interrupt Memory access command 2
– (0xfffc00) Debug interrupt brk command etc. 3
2 (0x02) 0x8008 NMI Watchdog timer overflow *2 4
3 (0x03) 0x800c reserved – –
4 (0x04) 0x8010 P0 port interrupt P00 to P07 port input High *1
5 (0x05) 0x8014 P1 port interrupt P10 to P17 port input
6 (0x06) 0x8018 Stopwatch timer interrupt • Timer 100 Hz signal
• Timer 10 Hz signal
• Timer 1 Hz signal
7 (0x07) 0x801c Clock timer interrupt • Timer 32 Hz signal
• Timer 8 Hz signal
• Timer 2 Hz signal
• Timer 1 Hz signal
8 (0x08) 0x8020 8-bit OSC1 timer interrupt Compare match
9 (0x09) 0x8024 reserved –
10 (0x0a) 0x8028
11 (0x0b) 0x802c PWM & capture timer interrupt • Compare A
• Compare B
12 (0x0c) 0x8030 8-bit timer interrupt Timer underflow
13 (0x0d) 0x8034 16-bit timer Ch.0 interrupt Timer underflow
14 (0x0e) 0x8038 16-bit timer Ch.1 interrupt Timer underflow
15 (0x0f) 0x803c 16-bit timer Ch.2 interrupt Timer underflow
16 (0x10) 0x8040 UART interrupt • Transmit buffer empty
• Receive buffer full
• Receive error
17 (0x11) 0x8044 Remote controller interrupt • Data length counter underflow
• Input rising edge detection
• Input falling edge detection
18 (0x12) 0x8048 SPI interrupt • Transmit buffer empty
• Receive buffer full
19 (0x13) 0x804c I2C interrupt • Transmit buffer empty
• Receive buffer full
20 (0x14) 0x8050
: : reserved –
31 (0x1f) 0x807c Low *1
*1: When same interrupt level is set
*2: Watchdog timer interrupt selects reset or NMI using software.
Vector numbers 4 to 19 are assigned maskable interrupts supported by the S1C17001.
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6.3 Maskable Interrupt Control
6.3.1 ITC Enable
To use ITC, set ITEN (D0/ITC_CTL register) to 1.
* ITEN: ITC Enable Bit in the ITC Control (ITC_CTL) Register (D0/0x4304)
If ITEN is 0, maskable interrupts will not occur, regardless of the other register settings.
6.3.2 Interrupt Request from Peripheral Module and Interrupt Flag
If an interrupt factor for a permitted interrupt occurs in a peripheral module, that module sends an interrupt request
signal to the ITC. This interrupt request signal causes the corresponding interrupt flag inside the ITC to be set to 1.
The interrupt flag is maintained at 1 until it is reset to 0, indicating that an interrupt request was received from the
peripheral module. The interrupt flag status can be read from the ITC_IFLG register (0x4300).
Table 6.3.2.1 shows the correspondence between interrupt factors and interrupt flags.
Table 6.3.2.1: Hardware interrupt factors and interrupt flags
Vector No. Hardware interrupt request Interrupt flag
4 P0 port interrupt: P00 to P07 port input EIFT0 (D0/ITC_IFLG register)
5 P1 port interrupt: P10 to P17 port input EIFT1 (D1/ITC_IFLG register)
6 Stopwatch timer interrupt: 100 Hz/10 Hz/1 Hz signal EIFT2 (D2/ITC_IFLG register)
7 Clock timer interrupt: 32 Hz/8 Hz/2 Hz/1 Hz signal EIFT3 (D3/ITC_IFLG register)
8 8-bit OSC1 timer interrupt: Compare match EIFT4 (D4/ITC_IFLG register)
11 PWM & capture timer interrupt: Compare A/Compare B match EIFT7 (D7/ITC_IFLG register)
12 8-bit timer interrupt: Timer underflow IIFT0 (D8/ITC_IFLG register)
13 16-bit timer Ch.0 interrupt: Timer underflow IIFT1 (D9/ITC_IFLG register)
14 16-bit timer Ch.1 interrupt: Timer underflow IIFT2 (D10/ITC_IFLG register)
15 16-bit timer Ch.2 interrupt: Timer underflow IIFT3 (D11/ITC_IFLG register)
16 UART interrupt: Transmit buffer empty/Receive buffer full/Receive error IIFT4 (D12/ITC_IFLG register)
17 Remote controller interrupt: Data length counter underflow/Input rise-
up/Input drop-off
IIFT5 (D13/ITC_IFLG register)
18 SPI interrupt: Transmit buffer empty/Receive buffer full IIFT6 (D14/ITC_IFLG register)
19 I2C interrupt: Transmit buffer empty/Receive buffer full IIFT7 (D15/ITC_IFLG register)
The ITC generates interrupts to the S1C17 core using the interrupt flags.
If an interrupt flag is set to 1 with the interrupt permitted (refer to next section for details), the ITC sends the inter-
rupt request, interrupt level, and vector number signals to the S1C17 core.
An interrupt flag set to 1 is reset by writing 1. The interrupt flag should be reset to 0 during the interrupt processing
routine. If the interrupt flag is not reset by the interrupt processing routine, the same interrupt will recur after the
interrupt processing routine has ended. (The interrupt is prohibited during interrupt processing and returned to the
permitted state on execution of the reti command after interrupt processing.)
Note however that the interrupt flags (EIFT0 to EIFT7) for interrupts set in the level trigger (refer to Section 6.3.5)
are not reset by writing 1. These interrupt flags are reset when the interrupt source sets the interrupt signal to inac-
tive.
Refer to the interrupt source module section for detailed information on the conditions under which interrupt fac-
tors arise and individual module interrupt settings are made.
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6.3.3 Interrupt Permission/Prohibition
Sending an interrupt request to the S1C17 core requires first permitting the individual interrupts using the interrupt
enable bit inside the ITC_EN register (0x4302) corresponding to the interrupt flag. Setting the interrupt enable bit
to 1 permits interrupts, while setting it to 0 (default) prohibits interrupts. The interrupt enable bit does not affect the
interrupt flag. Interrupt flags for interrupt requests generated by a peripheral module will be set regardless of the
interrupt enable bit setting.
Table 6.3.3.1 shows the correspondence between interrupt enable bits and interrupt flags.
Table 6.3.3.1: Interrupt enable bit list
Vector No. Hardware interrupt Interrupt flag Interrupt enable bit
4 P0 port interrupt EIFT0 (D0/ITC_IFLG register) EIEN0 (D0/ITC_EN register)
5 P1 port interrupt EIFT1 (D1/ITC_IFLG register) EIEN1 (D1/ITC_EN register)
6 Stopwatch timer interrupt EIFT2 (D2/ITC_IFLG register) EIEN2 (D2/ITC_EN register)
7 Clock timer interrupt EIFT3 (D3/ITC_IFLG register) EIEN3 (D3/ITC_EN register)
8 8-bit OSC1 timer interrupt EIFT4 (D4/ITC_IFLG register) EIEN4 (D4/ITC_EN register)
11 PWM & capture timer interrupt EIFT7 (D7/ITC_IFLG register) EIEN7 (D7/ITC_EN register)
12 8-bit timer interrupt IIFT0 (D8/ITC_IFLG register) IIEN0 (D8/ITC_EN register)
13 16-bit timer Ch.0 interrupt IIFT1 (D9/ITC_IFLG register) IIEN1 (D9/ITC_EN register)
14 16-bit timer Ch.1 interrupt IIFT2 (D10/ITC_IFLG register) IIEN2 (D10/ITC_EN register)
15 16-bit timer Ch.2 interrupt IIFT3 (D11/ITC_IFLG register) IIEN3 (D11/ITC_EN register)
16 UART interrupt IIFT4 (D12/ITC_IFLG register) IIEN4 (D12/ITC_EN register)
17 Remote controller interrupt IIFT5 (D13/ITC_IFLG register) IIEN5 (D13/ITC_EN register)
18 SPI interrupt IIFT6 (D14/ITC_IFLG register) IIEN6 (D14/ITC_EN register)
19 I2C interrupt IIFT7 (D15/ITC_IFLG register) IIEN7 (D15/ITC_EN register)
Note: • To prevent generating unnecessary interrupts, always set the interrupt flags before
permitting interrupts by writing 1 to the interrupt enable bit.
• To generate an actual interrupt, the IE bit in the S1C17 core Processor Status Register (PSR)
must be set to 1, in addition to the interrupt enable bit. The S1C17 core will not accept maskable
interrupt requests if the IE bit is set to 0. In this case, interrupt requests from the ITC will be
retained and accepted after the IE bit is set to 1.
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6.3.4 Processing for Multiple Interrupts
The ITC ITC_ELVx and ITC_ILVx registers (0x4306 to 0x4314) set the interrupt levels (0 to 7) for the various in-
terrupt factors.
Table 6.3.4.1: Interrupt level setting bits
Vector No. Hardware interrupt Interrupt level setting bit Register address
4 P0 port interrupt EILV0[2:0] (D[2:0]/ITC_ELV0 register) 0x4306
5 P1 port interrupt EILV1[2:0] (D[10:8]/ITC_ELV0 register) 0x4306
6 Stopwatch timer interrupt EILV2[2:0] (D[2:0]/ITC_ELV1 register) 0x4308
7 Clock timer interrupt EILV3[2:0] (D[10:8]/ITC_ELV1 register) 0x4308
8 8-bit OSC1 timer interrupt EILV4[2:0] (D[2:0]/ITC_ELV2 register) 0x430a
11 PWM & capture timer interrupt EILV7[2:0] (D[10:8]/ITC_ELV3 register) 0x430c
12 8-bit timer interrupt IILV0[2:0] (D[2:0]/ITC_ILV0 register) 0x430e
13 16-bit timer Ch.0 interrupt IILV1[2:0] (D[10:8]/ITC_ILV0 register) 0x430e
14 16-bit timer Ch.1 interrupt IILV2[2:0] (D[2:0]/ITC_ILV1 register) 0x4310
15 16-bit timer Ch.2 interrupt IILV3[2:0] (D[10:8]/ITC_ILV1 register) 0x4310
16 UART interrupt IILV4[2:0] (D[2:0]/ITC_ILV2 register) 0x4312
17 Remote controller interrupt IILV5[2:0] (D[10:8]/ITC_ILV2 register) 0x4312
18 SPI interrupt IILV6[2:0] (D[2:0]/ITC_ILV3 register) 0x4314
19 I2C interrupt IILV7[2:0] (D[10:8]/ITC_ILV3 register) 0x4314
The interrupt level can range from 0 to 7.
The interrupt level set is issued to the S1C17 core at the same time as an interrupt request from the ITC. This inter-
rupt level is used in the S1C17 core to prohibit subsequent interrupts with the same or lower levels (refer to Section
6.3.6).
Initial resets reset all interrupt levels to 0. The S1C17 core rejects interrupt requests if the interrupt level is 0.
The ITC uses the interrupt level when multiple interrupt factors occur simultaneously.
If multiple interrupts occur at the same time permitted by the interrupt enable bit, the ITC sends the interrupt re-
quest with the highest level set by the ITC_ELVx and ITC_ILVx registers to the S1C17 core.
If multiple interrupt factors with the same interrupt level occur simultaneously, the interrupt with the lowest vector
number is processed first. The other interrupts are held until all have been accepted by the S1C17 core in descend-
ing order of priority.
If an interrupt factor of higher priority occurs while the ITC outputs an interrupt request signal to the S1C17 core
(before acceptance by the S1C17 core), the ITC alters the vector number and interrupt level signal to the setting de-
tails of the most recent interrupt. The immediately preceding interrupt is held.
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6.3.5 Interrupt Trigger Modes
The ITC includes two trigger modes – pulse trigger mode and level trigger mode – which enable acceptance of in-
terrupt requests setting the EIFT flag as pulse or level signals.
Trigger mode can be selected using the EITGx bits within the ITC_ELVx register (0x4306 to 0x4308). Setting the
EITGx bits to 1 selects the level trigger mode; setting them to 0 (default) selects pulse trigger mode.
Note: All EITGx bits should be set to 1 (level trigger mode) for the S1C17001.
Table 6.3.5.1: Trigger mode selector bits
Hardware interrupt Trigger mode selector bit Register address
P0 port interrupt EITG0 (D4/ITC_ELV0 register) 0x4306
P1 port interrupt EITG1 (D12/ITC_ELV0 register) 0x4306
Stopwatch timer interrupt EITG2 (D4/ITC_ELV1 register) 0x4308
Clock timer interrupt EITG3 (D12/ITC_ELV1 register) 0x4308
8-bit OSC1 timer interrupt EITG4 (D4/ITC_ELV2 register) 0x430a
PWM & capture timer interrupt EITG7 (D12/ITC_ELV3 register) 0x430c
The module setting the IIFT flag outputs a pulse signal only as the interrupt request to the ITC. No trigger mode
selector bit is provided.
Pulse trigger mode
In pulse trigger mode, the ITC samples the interrupt signal using the system clock rising edge. If a pulse High
period is detected, the ITC sets the interrupt flag (IIFTx) to 1 and stops sampling that interrupt signal. The ITC
resumes sampling of the interrupt signal after the application program resets the interrupt flag (IIFTx) to 0 (via
interrupt processing routine).
pclk
Interrupt signal from
interrupt source
Interrupt flag
within ITC
Reset when software writes 1 to interrupt flag
Figure 6.3.5.1: Pulse trigger mode
Note: The S1C17001 interrupts listed below are in pulse trigger mode. If an interrupt occurs, reset
the interrupt flag IIFTx (to 1) within the interrupt processing routine.
• 8-bit timer interrupt
• 16-bit timer Ch.0 interrupt
• 16-bit timer Ch.1 interrupt
• 16-bit timer Ch.2 interrupt
• UART interrupt
• Remote controller interrupt
• SPI interrupt
• I2C interrupt
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Level trigger mode
In level trigger mode, the ITC samples the interrupt signal continuously using the system clock rising edge. The in-
terrupt flag (EIFTx) is set to 1 if High level is detected and is reset to 0 if Low level is subsequently detected. Since
interrupt flags (EIFTx) cannot be reset by writing 1 in this mode, the interrupt signal is held at High until the inter-
rupt source module is accepted by the S1C17 core, and the interrupt signal must subsequently be cleared.
pclk
Interrupt signal set to inactive by interrupt source
Interrupt signal from
interrupt source
Interrupt flag within ITC
Figure 6.3.5.2: Level trigger mode
Note: The S1C17001 interrupts listed below are in level trigger mode. The interrupt flag within pe-
ripheral modules must be reset (to 1) within the interrupt processing routine rather than EIFTx
• P0 port interrupt
• P1 port interrupt
• Stopwatch timer interrupt
• Clock timer interrupt
• 8-bit OSC1 timer interrupt
• PWM & capture timer interrupt
For more information on interrupt flags for resetting, refer to the peripheral module descrip-
tion.
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6.3.6 S1C17 Core Interrupt Processing
Maskable interrupts for the S1C17 core occur when all of the following conditions are met:
• ITEN (D0/ITC_CTL register) has been set to 1.
* ITEN: ITC Enable Bit in the ITC Control (ITC_CTL) Register (D0/0x4304)
• The corresponding interrupt enable bit has been set to 1 for the interrupt factor.
• The PSR (S1C17 core internal processor status register) IE (interrupt enable) bit has been set to 1.
• The interrupt factor has a higher interrupt level set than that set for the PSR IL (interrupt level).
• No other interrupt factors having higher procedence (e.g., NMI) are present.
When an interrupt factor occurs, the corresponding interrupt flag is set to 1. This state is maintained until reset by
the program or hardware (for interrupts set in level trigger mode). The interrupt factor is not cleared even if the
conditions listed above remain unmet when the interrupt factor occurs. An interrupt occurs when the above condi-
tions are met.
If multiple maskable interrupt factors occur simultaneously, the interrupt factor with the highest level becomes the
subject of the interrupt request to the S1C17 core. Interrupts with lower levels are held until the above conditions
are subsequently met.
The S1C17 core samples interrupt requests for each cycle. On accepting an interrupt request, the S1C17 core
switches to interrupt processing when execution of the current command is complete.
Interrupt processing involves the following steps:
(1) The PSR and current program counter (PC) value is moved to the stack.
(2) The PSR IE bit is reset to 0 (preventing subsequent maskable interrupts).
(3) The PSR IL is set to the received interrupt level. (The NMI does not affect interrupt levels.)
(4) The vector for the interrupt factor occurring is loaded to the PC to execute the interrupt processing routine.
When an interrupt is received, (2) prevents subsequent maskable interrupts. Setting the IE bit to 1 within the inter-
rupt processing routine allows handling of multiple interrupts. In this case, IL is changed by (3), and only interrupts
with higher levels than those already being processed will be accepted.
Ending interrupt processing routines using a reti command returns the PSR to the state before the interrupt. The
program resumes processing following the command being executed at the time the interrupt occurred via the next
branch.
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6.4 NMI
The S1C17001 can generate NMIs (non-maskable interrupts) using the watchdog timer. The vector number for
NMIs is 2, and the vector address is set in the vector table initial address + 8 bytes. These interrupts take prece-
dence over other interrupt factors and are accepted unconditionally by the S1C17 core.
For detailed information on generating NMIs, refer to “17 Watchdog Timer (WDT).”
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6.5 Software Interrupts
Interrupts can be generated via software with S1C17 core int imm5 or intl imm5 and imm3 commands. The vector
table vector number (0 to 31) is specified by the operand immediate imm5. With the intl command, imm3 can be
used to specify an interrupt level (0 to 7) for the PSR IL fields.
Details of the processor interrupt processing are the same as for when an interrupt generated by hardware occurs.
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6.6 HALT and SLEEP Mode Cancellation by Interrupt Factors
HALT and SLEEP modes are canceled by interrupt factors, and the CPU starts up.
The interrupt factors capable of starting the CPU and specific program execution details after CPU startup (whether
to branch into an interrupt processing routine) depend on the clock states in HALT and SLEEP modes.
For more information, refer to “B.1 Clock Control Power Saving” in Appendix B.
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6.7 Control Register Details
Table 6.7.1 ITC register list
Address Register name Function
0x4300 ITC_IFLG Interrupt Flag Register Indicates and resets interrupt occurrence status.
0x4302 ITC_EN Interrupt Enable Register Permits/blocks maskable interrupts.
0x4304 ITC_CTL ITC Control Register Permits/blocks ITC operation.
0x4306 ITC_ELV0 External Interrupt Level Setup Register 0 Sets P0 and P1 port interrupt level and trigger mode.
0x4308 ITC_ELV1 External Interrupt Level Setup Register 1 Sets stopwatch timer, clock timer interrupt level and trigger mode.
0x430a ITC_ELV2 External Interrupt Level Setup Register 2 Sets 8-bit OSC1 timer interrupt level and trigger mode.
0x430c ITC_ELV3 External Interrupt Level Setup Register 3 Sets PWM & capture timer interrupt level and trigger mode.
0x430e ITC_ILV0 Internal Interrupt Level Setup Register 0 Sets 8-bit timer and 16-bit timer Ch.0 interrupt level.
0x4310 ITC_ILV1 Internal Interrupt Level Setup Register 1 Sets 16-bit timer Ch.1 and 16-bit timer Ch.2 interrupt level.
0x4312 ITC_ILV2 Internal Interrupt Level Setup Register 2 Sets UART and remote controller interrupt level.
0x4314 ITC_ILV3 Internal Interrupt Level Setup Register 3 Sets SPI and I2C interrupt levels.
The ITC registers are described in detail below. These are 16-bit registers.
Note: When data is written to the registers, the “Reserved” bits must always be written as 0 and not 1.
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0x4300: Interrupt Flag Register (ITC_IFLG)
Register name Address Bit Name Function Setting Init. R/W Remarks
Interrupt Flag
Register
(ITC_IFLG)
0x4300
(16 bits)
D15 IIFT7 I2C interrupt flag 1 Cause of
interrupt
occurred
0 Cause of
interrupt not
occurred
0 R/W Reset by writing 1.
D14 IIFT6 SPI interrupt flag 0 R/W
D13 IIFT5 Remote controller interrupt flag 0 R/W
D12 IIFT4 UART interrupt flag 0 R/W
D11 IIFT3 16-bit timer Ch.2 interrupt flag 0 R/W
D10 IIFT2 16-bit timer Ch.1 interrupt flag 0 R/W
D9 IIFT1 16-bit timer Ch.0 interrupt flag 0 R/W
D8 IIFT0 8-bit timer interrupt flag 0 R/W
D7 EIFT7 PWM&capture timer interrupt flag 1 Cause of
interrupt
occurred
0 Cause of
interrupt not
occurred
0 R/W Reset by writing 1 in
pulse trigger mode.
Cannot be reset by
software in level trig-
ger mode.
D6 EIFT6 reserved 0 R/W
D5 EIFT5 reserved 0 R/W
D4 EIFT4 8-bit OSC1 timer interrupt flag 0 R/W
D3 EIFT3 Clock timer interrupt flag 0 R/W
D2 EIFT2 Stopwatch timer interrupt flag 0 R/W
D1 EIFT1 P1 port interrupt flag 0 R/W
D0 EIFT0 P0 port interrupt flag 0 R/W
D[15:8] IIFT[7:0]: Interrupt Flags (for Pulse Trigger)
These are interrupt flags indicating the interrupt factor occurrence status.
1(R): Interrupt factor present
0(R): No interrupt factor (default)
1(W): Reset flag
0(W): Disabled
The interrupt flags are reset to 1 if an interrupt factor occurs in the peripheral modules.
An interrupt is generated to the S1C17 core provided the following conditions are met:
1. The corresponding interrupt enable bit is set to 1.
2. No other interrupt having requests higher priority levels have occurred.
3. The PSR IE bit was set to 1 (interrupt permitted).
4. The corresponding interrupt level setting bit has been set to a higher level than the S1C17 core inter-
rupt level (IL).
The interrupt flags are set to 1 when an interrupt factor occurs regardless of the interrupt enable bit or
interrupt level setting bit states.
The interrupt flags must be reset and the PSR must be reset (by setting the IE bit to 1 or with the reti
command) to accept the next interrupt after interrupt occurrence.
An interrupt factor flag set to 1 is reset by writing 1.
Table 6.7.2: Hardware interrupt factors and interrupt flags
Interrupt flag Hardware interrupt factor
IIFT0 (D8) 8-bit timer interrupt: Timer underflow
IIFT1 (D9) 16-bit timer Ch.0 interrupt: Timer underflow
IIFT2 (D10) 16-bit timer Ch.1 interrupt: Timer underflow
IIFT3 (D11) 16-bit timer Ch.2 interrupt: Timer underflow
IIFT4 (D12) UART interrupt: Transmit buffer empty/Receive buffer full/Receive error
IIFT5 (D13) Remote controller interrupt: Data length counter underflow/Input rise-up/Input drop-
off
IIFT6 (D14) SPI interrupt: Transmit buffer empty/Receive buffer full
IIFT7 (D15) I2C interrupt: Transmit buffer empty/Receive buffer full
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D[7:0] EIFT[7:0]: Interrupt Flags (for Level Trigger)
These are interrupt flags indicating the interrupt factor occurrence status.
1(R): Interrupt factor present
0(R): No interrupt factor (default)
1(W): Disabled
0(W): Disabled
Refer to the description for IIFT[7:0].
Note that these interrupts must be set to level trigger mode in the ITC_ELVx registers (0x4306 to
0x430c). To reset the interrupt flags, rather than writing 1 to the bit, set the interrupt flag to 1 within the
peripheral module.
Table 6.7.3: Hardware interrupt factors and interrupt flags
Interrupt flag Hardware interrupt factor
EIFT0 (D0) P0 port interrupt: P00 to P07 port input
EIFT1 (D1) P1 port interrupt: P10 to P17 port input
EIFT2 (D2) Stopwatch timer interrupt: 100 Hz/10 Hz/1 Hz signal
EIFT3 (D3) Clock timer interrupt: 32 Hz/8 Hz/2 Hz/1 Hz signal
EIFT4 (D4) 8-bit OSC1 timer interrupt: Compare match
EIFT7 (D7) PWM & capture timer interrupt: Compare A/Compare B match
Note: The interrupt flags are not reset even if maskable interrupt requests are accepted by the
S1C17 core and branched to interrupt processing routines. Note that returning from an inter-
rupt processing routine using the reti command without resetting the interrupt flags using
the program will generate the same interrupt. Interrupt flags set to level trigger must be reset
by the control register within the peripheral module.
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0x4302: Interrupt Enable Register (ITC_EN)
Register name Address Bit Name Function Setting Init. R/W Remarks
Interrupt
Enable Register
(ITC_EN)
0x4302
(16 bits)
D15 IIEN7 I2C interrupt enable 1 Enable 0 Disable 0 R/W
D14 IIEN6 SPI interrupt enable 0 R/W
D13 IIEN5 Remote controller interrupt enable 0 R/W
D12 IIEN4 UART interrupt enable 0 R/W
D11 IIEN3 16-bit timer Ch.2 interrupt enable 0 R/W
D10 IIEN2 16-bit timer Ch.1 interrupt enable 0 R/W
D9 IIEN1 16-bit timer Ch.0 interrupt enable 0 R/W
D8 IIEN0 8-bit timer interrupt enable 0 R/W
D7 EIEN7 PWM&capture timer interrupt en-
able
0 R/W
D6 EIEN6 reserved 0 R/W
D5 EIEN5 reserved 0 R/W
D4 EIEN4 8-bit OSC1 timer interrupt enable 0 R/W
D3 EIEN3 Clock timer interrupt enable 0 R/W
D2 EIEN2 Stopwatch timer interrupt enable 0 R/W
D1 EIEN1 P1 port interrupt enable 0 R/W
D0 EIEN0 P0 port interrupt enable 0 R/W
D[15:0] IIEN[7:0], EIEN[7:0]: Interrupt Enable Bits
These bits permit or prohibit interrupt events.
1 (R/W): Interrupt permitted
0 (R/W): Interrupt prohibited (default)
Setting the interrupt enable bit to 1 permits interrupts. Setting it to 0 prohibits interrupts.
Even if interrupt prohibition has been set, the corresponding interrupt can still be used to cancel Stand-
by mode.
Table 6.7.4: Hardware interrupt factors and interrupt enable bits
Interrupt enable bit Hardware interrupt factor
EIEN0 (D0) P0 port interrupt: P00 to P07 port input
EIEN1 (D1) P1 port interrupt: P10 to P17 port input
EIEN2 (D2) Stopwatch timer interrupt: 100 Hz/10 Hz/1 Hz signal
EIEN3 (D3) Clock timer interrupt: 32 Hz/8 Hz/2 Hz/1 Hz signal
EIEN4 (D4) 8-bit OSC1 timer interrupt: Compare match
EIEN7 (D7) PWM & capture timer interrupt: Compare A/Compare B match
IIEN0 (D8) 8-bit timer interrupt: Timer underflow
IIEN1 (D9) 16-bit timer Ch.0 interrupt: Timer underflow
IIEN2 (D10) 16-bit timer Ch.1 interrupt: Timer underflow
IIEN3 (D11) 16-bit timer Ch.2 interrupt: Timer underflow
IIEN4 (D12) UART interrupt: Transmit buffer empty/Receive buffer full/Receive error
IIEN5 (D13) Remote controller interrupt: Data length counter underflow/Input rise-up/Input drop-
off
IIEN6 (D14) SPI interrupt: Transmit buffer empty/Receive buffer full
IIEN7 (D15) I2C interrupt: Transmit buffer empty/Receive buffer full
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0x4304: ITC Control Register (ITC_CTL)
Register name Address Bit Name Function Setting Init. R/W Remarks
ITC Control
Register
(ITC_CTL)
0x4304
(16 bits)
D15–1 –reserved – – – 0 when being read.
D0 ITEN ITC enable 1 Enable 0 Disable 0 R/W
D[15:1] Reserved
D0 ITEN: ITC Enable Bit
Permits interrupt control using the ITC.
1 (R/W): Permitted
0 (R/W): Prohibited (default)
Set to 1 before using the ITC.
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0x4306: External Interrupt Level Setup Register 0 (ITC_ELV0)
Register name Address Bit Name Function Setting Init. R/W Remarks
External
Interrupt Level
Setup Register 0
(ITC_ELV0)
0x4306
(16 bits)
D15–13 –reserved – – – 0 when being read.
D12 EITG1 P1 interrupt trigger mode 1 Level 0 Pulse 0 R/W Be sure to set to 1.
D11 –reserved – – – 0 when being read.
D10–8 EILV1[2:0] P1 interrupt level 0 to 7 0x0 R/W
D7–5 –reserved – – – 0 when being read.
D4 EITG0 P0 interrupt trigger mode 1 Level 0 Pulse 0 R/W Be sure to set to 1.
D3 –reserved – – – 0 when being read.
D2–0 EILV0[2:0] P0 interrupt level 0 to 7 0x0 R/W
D[15:13] Reserved
D12 EITG1: P1 Port Interrupt Trigger Mode Select Bit
Selects P1 port interrupt trigger mode. This should be set to 1 for the S1C17001.
1 (R/W): Level trigger mode
0 (R/W): Pulse trigger mode (default)
In pulse trigger mode, the ITC samples interrupt signals using system clock rising edges. When the
pulse High period is detected, the ITC sets the interrupt flag (EIFTx) to 1 and stops sampling that inter-
rupt signal. The ITC resumes interrupt signal sampling after the application program (interrupt process-
ing routine) resets the interrupt flag (EIFTx) to 0.
In level trigger mode, the ITC samples interrupt signals using system clock rising edges. When High
level is detected, the interrupt flag (EIFTx) is set to 1 and is subsequently reset to 0 when Low level is
detected. Interrupt flags (EIFTx) cannot be reset by writing 1 in this mode. The interrupt signal must be
maintained at High until the interrupt source module is accepted by the S1C17 core, and the interrupt
signal must then be cleared.
D11 Reserved
D[10:8] EILV1[2:0]: P1 Port Interrupt Level Bits
Set the P1 port interrupt level (0 to 7). (Default: 0)
The S1C17 core does not accept interrupts with levels set lower than the PSR IL value.
The ITC uses the interrupt level when multiple interrupt factors occur simultaneously.
If multiple interrupts occur at the same time permitted by the interrupt enable bit, the ITC sends the in-
terrupt request with the highest level set by the ITC_ELVx and ITC_ILVx registers (0x4306 to 0x4314)
to the S1C17 core.
If multiple interrupt factors with the same interrupt level occur simultaneously, the interrupt with the
lowest vector number is processed first. The other interrupts are held until all have been accepted by the
S1C17 core in descending order of priority.
If an interrupt factor of higher priority occurs while the ITC outputs an interrupt request signal to the
S1C17 core (before acceptance by the S1C17 core), the ITC alters the vector number and interrupt level
signal to the setting details of the most recent interrupt. The immediately preceding interrupt is held.
D[7:5] Reserved
D4 EITG0: P0 Port Interrupt Trigger Mode Select Bit
Selects P0 port interrupt trigger mode. This should be set to 1 for the S1C17001.
1 (R/W): Level trigger mode
0 (R/W): Pulse trigger mode (default)
Refer to the EITG1 (D12) description.
D3 Reserved
D[2:0] EILV0[2:0]: P0 Port Interrupt Level Bits
Set the P0 port interrupt level (0 to 7). (Default: 0)
Refer to the EILV1[2:0] (D[10:8]) description.
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0x4308: External Interrupt Level Setup Register 1 (ITC_ELV1)
Register name Address Bit Name Function Setting Init. R/W Remarks
External
Interrupt Level
Setup Register 1
(ITC_ELV1)
0x4308
(16 bits)
D15–13 –reserved – – – 0 when being read.
D12 EITG3 CT interrupt trigger mode 1 Level 0 Pulse 0 R/W Be sure to set to 1.
D11 –reserved – – – 0 when being read.
D10–8 EILV3[2:0] CT interrupt level 0 to 7 0x0 R/W
D7–5 –reserved – – – 0 when being read.
D4 EITG2 SWT interrupt trigger mode 1 Level 0 Pulse 0 R/W Be sure to set to 1.
D3 –reserved – – – 0 when being read.
D2–0 EILV2[2:0] SWT interrupt level 0 to 7 0x0 R/W
D[15:13] Reserved
D12 EITG3: Clock Timer Interrupt Trigger Mode Select Bit
Selects clock timer interrupt trigger mode. This should be set to 1 for the S1C17001.
1 (R/W): Level trigger mode
0 (R/W): Pulse trigger mode (default)
Refer to the ITC_ELV0 register (0x4306) EITG1 (D12) description.
D11 Reserved
D[10:8] EILV3[2:0]: Clock Timer Interrupt Level Bits
Set the clock timer interrupt level (0 to 7). (Default: 0)
Refer to the ITC_ELV0 register (0x4306) EILV1[2:0] (D[10:8]) description.
D[7:5] Reserved
D4 EITG2: Stopwatch Timer Interrupt Trigger Mode Select Bit
Selects stopwatch timer interrupt trigger mode. This should be set to 1 for the S1C17001.
1 (R/W): Level trigger mode
0 (R/W): Pulse trigger mode (default)
Refer to the ITC_ELV0 register (0x4306) EITG1 (D12) description.
D3 Reserved
D[2:0] EILV2[2:0]: Stopwatch Timer Interrupt Level Bits
Set the stopwatch timer interrupt level (0 to 7). (Default: 0)
Refer to the ITC_ELV0 register (0x4306) EILV1[2:0] (D[10:8]) description.
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0x430a: External Interrupt Level Setup Register 2 (ITC_ELV2)
Register name Address Bit Name Function Setting Init. R/W Remarks
External
Interrupt Level
Setup Register 2
(ITC_ELV2)
0x430a
(16 bits)
D15–5 –reserved – – – 0 when being read.
D4 EITG4 T8OSC1 interrupt trigger mode 1 Level 0 Pulse 0 R/W Be sure to set to 1.
D3 –reserved – – – 0 when being read.
D2–0 EILV4[2:0] T8OSC1 interrupt level 0 to 7 0x0 R/W
D[15:5] Reserved
D4 EITG4: 8-bit OSC1 Timer Interrupt Trigger Mode Select Bit
Selects 8-bit OSC1 timer interrupt trigger mode. This should be set to 1 for the S1C17001.
1 (R/W): Level trigger mode
0 (R/W): Pulse trigger mode (default)
Refer to the ITC_ELV0 register (0x4306) EITG1 (D12) description.
D3 Reserved
D[2:0] EILV4[2:0]: 8-bit OSC1 Timer Interrupt Level Bits
Set the 8-bit OSC1 timer interrupt level (0 to 7). (Default: 0)
Refer to the ITC_ELV0 register (0x4306) EILV1[2:0] (D[10:8]) description.
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0x430c: External Interrupt Level Setup Register 3 (ITC_ELV3)
Register name Address Bit Name Function Setting Init. R/W Remarks
External
Interrupt Level
Setup Register 3
(ITC_ELV3)
0x430c
(16 bits)
D15–13 –reserved – – – 0 when being read.
D12 EITG7 T16E interrupt trigger mode 1 Level 0 Pulse 0 R/W Be sure to set to 1.
D11 –reserved – – – 0 when being read.
D10–8 EILV7[2:0] T16E interrupt level 0 to 7 0x0 R/W
D7–0 –reserved – – – 0 when being read.
D[15:13] Reserved
D12 EITG7: PWM & Capture Timer Interrupt Trigger Mode Select Bit
Selects PWM & capture timer interrupt trigger mode. This should be set to 1 for the S1C17001.
1 (R/W): Level trigger mode
0 (R/W): Pulse trigger mode (default)
Refer to the ITC_ELV0 register (0x4306) EITG1 (D12) description.
D11 Reserved
D[10:8] EILV7[2:0]: PWM & Capture Timer Interrupt Level Bits
Set the PWM & capture timer interrupt level (0 to 7). (Default: 0)
Refer to the ITC_ELV0 register (0x4306) EILV1[2:0] (D[10:8]) description.
D[7:0] Reserved
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0x430e: Internal Interrupt Level Setup Register 0 (ITC_ILV0)
Register name Address Bit Name Function Setting Init. R/W Remarks
Internal Inter-
rupt Level
Setup Register 0
(ITC_ILV0)
0x430e
(16 bits)
D15–11 –reserved – – – 0 when being read.
D10–8 IILV1[2:0] T16 Ch.0 interrupt level 0 to 7 0x0 R/W
D7–3 –reserved – – – 0 when being read.
D2–0 IILV0[2:0] T8 interrupt level 0 to 7 0x0 R/W
D[15:11] Reserved
D[10:8] IILV1[2:0]: 16-bit Timer Ch.0 Interrupt Level Bits
Set the 16-bit timer Ch.0 interrupt level (0 to 7). (Default: 0)
The S1C17 core does not accept interrupts with levels set lower than the PSR IL value.
The ITC uses the interrupt level when multiple interrupt factors occur simultaneously.
If multiple interrupts occur at the same time permi tted by the interrupt enable bit, the ITC sends the in-
terrupt request with the highest level set by the ITC_ELVx and ITC_ILVx registers (0x4306 to 0x4314)
to the S1C17 core.
If multiple interrupt factors with the same interrupt level occur simultaneously, the interrupt with the
lowest vector number is processed first. The other interrupts are held until all have been accepted by the
S1C17 core in descending order of priority.
If an interrupt factor of higher priority occurs while the ITC outputs an interrupt request signal to the
S1C17 core (before acceptance by the S1C17 core), the ITC alters the vector number and interrupt level
signal to the setting details of the most recent interrupt. The immediately preceding interrupt is held.
D[7:3] Reserved
D[2:0] IILV0[2:0]: 8-bit Timer Interrupt Level Bits
Set the 8-bit timer interrupt level (0 to 7). (Default: 0)
Refer to the IILV1[2:0] (D[10:8]) description.
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0x4310: Internal Interrupt Level Setup Register 1 (ITC_ILV1)
Register name Address Bit Name Function Setting Init. R/W Remarks
Internal
Interrupt Level
Setup Register 1
(ITC_ILV1)
0x4310
(16 bits)
D15–11 –reserved – – – 0 when being read.
D10–8 IILV3[2:0] T16 Ch.2 interrupt level 0 to 7 0x0 R/W
D7–3 –reserved – – – 0 when being read.
D2–0 IILV2[2:0] T16 Ch.1 interrupt level 0 to 7 0x0 R/W
D[15:11] Reserved
D[10:8] IILV3[2:0]: 16-bit Timer Ch.2 Interrupt Level Bits
Set the 16-bit timer Ch.2 interrupt level (0 to 7). (Default: 0)
Refer to the ITC_ILV0 register (0x430e) IILV1[2:0] (D[10:8]) description.
D[7:3] Reserved
D[2:0] IILV2[2:0]: 16-bit Timer Ch.1 Interrupt Level Bits
Set the 16-bit timer Ch.1 interrupt level (0 to 7). (Default: 0)
Refer to the ITC_ILV0 register (0x430e) IILV1[2:0] (D[10:8]) description.
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0x4312: Internal Interrupt Level Setup Register 2 (ITC_ILV2)
Register name Address Bit Name Function Setting Init. R/W Remarks
Internal
Interrupt Level
Setup Register 2
(ITC_ILV2)
0x4312
(16 bits)
D15–11 –reserved – – – 0 when being read.
D10–8 IILV5[2:0] REMC interrupt level 0 to 7 0x0 R/W
D7–3 –reserved – – – 0 when being read.
D2–0 IILV4[2:0] UART interrupt level 0 to 7 0x0 R/W
D[15:11] Reserved
D[10:8] IILV5[2:0]: Remote Controller Interrupt Level Bits
Set the remote controller interrupt level (0 to 7). (Default: 0)
Refer to the ITC_ILV0 register (0x430e) IILV1[2:0] (D[10:8]) description.
D[7:3] Reserved
D[2:0] IILV4[2:0]: UART Interrupt Level Bits
Set the UART interrupt level (0 to 7). (Default: 0)
Refer to the ITC_ILV0 register (0x430e) IILV1[2:0] (D[10:8]) description.
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0x4314: Internal Interrupt Level Setup Register 3 (ITC_ILV3)
Register name Address Bit Name Function Setting Init. R/W Remarks
Internal
Interrupt Level
Setup Register 3
(ITC_ILV3)
0x4314
(16 bits)
D15–11 –reserved – – – 0 when being read.
D10–8 IILV7[2:0] I2C interrupt level 0 to 7 0x0 R/W
D7–3 –reserved – – – 0 when being read.
D2–0 IILV6[2:0] SPI interrupt level 0 to 7 0x0 R/W
D[15:11] Reserved
D[10:8] IILV7[2:0]: I2C Interrupt Level Bits
Set the I2C interrupt level (0 to 7). (Default: 0)
Refer to the ITC_ILV0 register (0x430e) IILV1[2:0] (D[10:8]) description.
D[7:3] Reserved
D[2:0] IILV6[2:0]: SPI Interrupt Level Bits
Set the SPI interrupt level (0 to 7). (Default: 0)
Refer to the ITC_ILV0 register (0x430e) IILV1[2:0] (D[10:8]) description.
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6.8 Precautions
• To prevent the recurrence of interrupts due to the same interrupt factor, always reset the interrupt flag before per-
mitting interrupts, resetting PSR, or executing the reti command.
• The S1C17001 interrupts listed below are in level trigger mode.
- P0 port interrupt
- P1 port interrupt
- Stopwatch timer interrupt
- Clock timer interrupt
- 8-bit OSC1 timer interrupt
- PWM & capture timer interrupt
Make sure all EITGx bits within the ITC_ELVx registers (0x4306 to 0x430c) have been set to 1 (level trigger
mode).
The interrupt flag within peripheral modules must be reset (to 1) within the interrupt processing routine rather
than EIFTx. For more information on interrupt flags for resetting, refer to the peripheral module description.
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7 OSCILLATOR CIRCUIT (OSC)
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7OscillatorCircuit(OSC)
7.1 OSC Module Configuration
The S1C17001 incorporates two internal oscillator circuits (OSC3 and OSC1). The OSC3 oscillator circuit gener-
ates the main clock (max. 8.2 MHz) for high-speed operation of the S1C17 core and peripheral circuits. The OSC1
oscillator circuit generates a sub-clock (typ. 32.768 kHz) for timer and low-power operations.
The OSC3 clock is selected as the system clock after initial resetting.
Oscillator circuit on/off switching and system clock selection (between OSC3 and OSC1) is controlled by software.
External clock output is also possible.
Figure 7.1.1 illustrates the clock system and OSC module configuration.
OSC3
CCLK
OSC1
OSC1
FOUT3
output circuit
OSC3
oscillator circuit
(8.2 MHz)
OSC1
oscillator circuit
(32.768 kHz)
Division circuit
(1/1 to 1/4)
Wait circuit for
wakeup Clock gear
(1/1 to 1/8)
Gate S1C17 core
BCLK Internal bus, RAM,
ROM
ITC, T16, T8F, UART,
SPI, I2C, T16E, P,
MISC, REMC,
Control register (CT,
SWT, WDT, T8OSC1)
PCLK
CLK_256Hz
OSC3
OSC4
Clock source
selection
System
clock
FOUT3
FOUT1
output circuit
FOUT1
Noise filter
RESET
OSC1
OSC2
SLEEP, on/off control
Gear selection
wakeup HALT
On/off control
S1C17 core
S1C17 core
Division ratio
selection
Division circuit
(1/1 to 1/16K)
Division ratio selection On/off control
On/off control
On/off control
SLEEP, on/off control
Noise filter
NMI
On/off control
CT, SWT, WDT
T8OSC1
Division
circuit
Gate
Gate
On/off control
On/off control
Gate
CLG
PSC
OSC
T8F, T16, T16E,
REMC, P, UART, SPI,
I2C
Gate
HALT
(1/1 to 1/32)
(1/128)
Figure 7.1.1: OSC module configuration
To reduce power consumption, control the clock in conjunction with processing and use standby mode. For more
information on reducing power consumption, refer to “Appendix B: Power Saving.”
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7.2 OSC3 Oscillator Circuit
The OSC3 oscillator circuit generates the main clock (max. 8.2 MHz) for high-speed operation of the S1C17 core
and peripheral circuits. The oscillator circuit can be either crystal- or ceramic-based. It also supports external clock
input.
Oscillator circuit
control signal
Oscillator circuit
control signal
SLEEP control SLEEP control
VSS
OSC4
OSC3
CD3
CG3
X'tal3
or
Ceramic
OSC3
OSC4
OSC3
External
clock
N.C.
VSS
LVDD
OSC3
(1) Crystal/ceramic oscillator circuit (2) External clock input
Rf
Rd
Figure 7.2.1 illustrates the OSC3 oscillator circuit configuration.
When used as a crystal or ceramic oscillator circuit, a crystal oscillator (X’tal3) or ceramic oscillator (Ceramic)
and feedback resistor (Rf) should be connected between the OSC3 and OSC4 pins. Two capacitors (CG3 and CD3)
should also be connected between the OSC3/OSC4 pins and VSS. A drain resistor (Rd) should be connected between
the OSC4 pin and CD3, if required.
When used with external clock input, the OSC4 pin should be left free, and a clock with a duty ratio of 50% at
LVDD level should be input to the OSC3 pin.
OSC3 oscillation on/off
The OSC3 oscillator circuit stops oscillating if OSC3EN (D0/OSC_CTL register) is set to 0 and starts oscillat-
ing if set to 1. The OSC3 oscillator circuit stops oscillating even in SLEEP mode.
* OSC3EN: OSC3 Enable Bit in the Oscillation Control (OSC_CTL) Register (D0/0x5061)
After initial resetting, OSC3EN is set to 1 and the OSC3 oscillator circuit is on. Since the OSC3 clock is used
as the system clock, the S1C17 core begins operating using the OSC3 clock.
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S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 59
Stabilization wait time at start of OSC3 oscillation
The OSC3 oscillator circuit incorporates an oscillation stabilization wait timer to prevent malfunctions due
to unstable clock operations at the start of OSC3 oscillation—for example, when power is first turned on, on
awaking from SLEEP, or when the OSC3 oscillation circuit is turned on via software. The OSC3 clock is not
fed to the system until the time set for this timer has elapsed.
Four different oscillation stabilization wait times can be selected using the OSC3WT[1:0] (D[5:4]/OSC_CTL
register)
* OSC3WT[1:0]: OSC3 Wait Cycle Select Bits in the Oscillation Control (OSC_CTL) Register (D[5:4]/0x5061)
Table 7.2.2: OSC3 oscillation stabilization wait time settings
OSC3WT[1:0] Oscillation stabilization
wait time
0x3 128 cycles
0x2 256 cycles
0x1 512 cycles
0x0 1,024 cycles
(Default: 0x0)
This is set to 1,024 cycles (OSC3 clock) after initial resetting. The CPU does not begin operating immediately after
resetting until this time has elapsed.
Note: The OSC3 oscillation start time depends on the oscillator and externally connected compo-
nents. The time should be set with an adequate oscillation stabilization wait time. Refer to the
typical oscillation start times specified in “24 Electrical Characteristics.”
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7.3 OSC1 Oscillator Circuit
The OSC1 oscillator circuit generates a (typ.) 32.768 kHz sub-clock.
The OSC1 clock is generally used as the timer operation clock (for the clock timer, stopwatch timer, watchdog tim-
er, and 8-bit OSC1 timer). It reduces power consumption and can be used as the system clock instead of the OSC3
clock when no high-speed processing is required.
The oscillator circuit is crystal-based. The oscillator circuit also allows use of an external clock input.
Figure 7.3.1 illustrates the OSC1 oscillator circuit configuration.
Low level
OSC1 External
clock
N.C.
VSS
LVDD
OSC1
(1) Crystal oscillator circuit
VSS
(3) When not used
(2) External clock input
VSS
CD1
CG1
X'tal1 Rf
Rd
OSC2
OSC1
OSC2
OSC1
OSC2
OSC1
Oscillator circuit
control signal
Oscillator circuit
control signal
SLEEP control
Oscillator circuit
control signal
SLEEP control
SLEEP control
Figure 7.3.1: OSC1 oscillator circuit
When this is used as a crystal oscillator circuit, connect a crystal oscillator X’tal1 (typ. 32.768 kHz) and feedback
resistor (Rf) between the OSC1 and OSC2 pins. Connect two capacitors (CG1 and CD1) between the OSC1/OSC2
pins and VSS. A drain resistor (Rd) should be connected between the OSC2 pin and CD1, if required.
When used with external clock (max. 100 kHz) input, the OSC2 pin should be left free, and a clock with a duty ra-
tio of 50% at LVDD level should be input to the OSC1 pin.
If the OSC1 oscillator circuit is not used, connect the OSC1 pin to VSS while leaving the OSC2 pin open.
OSC1 oscillation on/off
The OSC1 oscillator circuit stops oscillating if OSC1EN (D1/OSC_CTL register) is set to 0 and starts oscillat-
ing if set to 1. The OSC1 oscillator circuit stops oscillating even in SLEEP mode.
* OSC1EN: OSC1 Enable Bit in the Oscillation Control (OSC_CTL) Register (D1/0x5061)
Stabilization wait time at start of OSC1 oscillation
The OSC1 oscillator circuit incorporates an oscillation stabilization wait timer to prevent malfunctions due
to unstable clock operations at the start of OSC1 oscillation—for example, when power is first turned on, on
awaking from SLEEP, or when the OSC1 oscillation circuit is turned on via software. The OSC1 clock does not
feed the system for a period of 256 cycles after the start of oscillation.
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7.4 System Clock Switching
The software can be used to select the OSC3 or OSC1 clocks as the system clock. If possible, you can reduce pow-
er consumption by stopping OSC3 oscillation after switching the system clock to OSC1.
The procedure is given below.
OSC3 to OSC1
1. If OSC1 oscillation is stopped, start oscillation by setting OSC1EN (D1/OSC_CTL register) to 1.
* OSC1EN: OSC1 Enable Bit in the Oscillation Control (OSC_CTL) Register (D1/0x5061)
2. Set CLKSRC (D0/OSC_SRC register) to 1 and switch the system clock from OSC3 to OSC1.
* CLKSRC: System Clock Source Select Bit in the Clock Source Select (OSC_SRC) Register (D0/0x5060)
3. If operation is not required for peripheral modules using OSC3 as an oscillation source, set OSC3EN (D0/
OSC_CTL register) to 0 to stop OSC3 oscillation.
* OSC3EN: OSC3 Enable Bit in the Oscillation Control (OSC_CTL) Register (D0/0x5061)
Note: • Switching the system clock from OSC3 to OSC1 immediately after starting OSC1 oscillation will
stop the system clock until the OSC1 clock starts up (for the OSC1 clock 256-cycle period).
• OSC3 oscillation cannot be stopped before switching the system clock to OSC1.
OSC1 to OSC3
1. Set the OSC3WT[1:0] (D[5:4]/OSC_CTL register) to an oscillation stabilization wait time (see Table 7.2.2)
at least as long as OSC3 oscillation start time. (Not necessary if already set.)
* OSC3WT[1:0]: OSC3 Wait Cycle Select Bits in the Oscillation Control (OSC_CTL) Register (D[5:4]/0x5061)
2. If the OSC3 oscillation is stopped, set OSC3EN (D0/OSC_CTL register) to 1 to start oscillation. After start-
ing OSC3 oscillation, the OSC3 clock is not fed until the time set in OSC3WT[1:0] (D[5:4]/OSC_CTL regis-
ter) has elapsed.
3. Set CLKSRC (D0/OSC_SRC register) to 0 to switch the system clock from OSC1 to OSC3.
4. If operation is not required for peripheral modules using OSC1 as an oscillation source, set OSC1EN (D1/
OSC_CTL register) to 0 to stop OSC1 oscillation.
Note: • Steps 1 and 2 are not required if the OSC3 oscillation circuit is already operating.
• The OSC3 oscillation start time depends on the oscillator and externally connected compo-
nents. The time should be set with an adequate oscillation stabilization wait time. Refer to the
typical oscillation start times specified in “24 Electrical Characteristics.”
• OSC1 oscillation cannot be stopped before switching the system clock to OSC3.
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7.5 8-bit OSC1 Timer Clock Control
The OSC module consists of a division circuit for generating the 8-bit OSC1 timer operation clock and a device
for controlling the feed. The 8-bit OSC1 timer is a programmable timer that operates only using the OSC1 division
clock. For detailed information, refer to “14 8-bit OSC1 Timer (T8OSC1).”
OSC1 clock 8-bit OSC1 timer
Division ratio selection On/off control
Division circuit
(1/1 to 1/32)
Gate
Figure 7.5.1: 8-bit OSC1 timer clock control circuit
Clock division ratio selection
Select the OSC1 clock division ratio using T8O1CK[2:0] (D[3:1]/OSC_T8OSC1 register)
* T8O1CK[2:0]: T8OSC1 Clock Division Ratio Select Bits in the T8OSC1 Clock Control (OSC_T8OSC1)
Register (D[3:1]/0x5065)
Table 7.5.1: T8OSC1 clock division ratio selection
T8O1CK[2:0] Division ratio
0x7 to 0x6 Reserved
0x5 OSC1-1/32
0x4 OSC1-1/16
0x3 OSC1-1/8
0x2 OSC1-1/4
0x1 OSC1-1/2
0x0 OSC1-1/1
(Default: 0x0)
Clock feed control
The clock feed to the 8-bit OSC1 timer is controlled using T8O1CE (D0/OSC_T8OSC1 register).
The T8O1CE default setting is 0, which stops the clock feed. Setting T8O1CE to 1 sends the clock generated as
above to the 8-bit OSC1 timer. Stop the clock feed to reduce power consumption if 8-bit OSC1 timer operation
is not required.
* T8O1CE: T8OSC1 Clock Enable Bit in the T8OSC1 Clock Control (OSC_T8OSC1) Register (D0/0x5065)
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7.6 Clock External Output (FOUT3, FOUT1)
The OSC3 division clock (FOUT3) and OSC1 clock (FOUT1) can be output to devices outside the chip.
Division circuit
(1/1 to 1/4)
FOUT3(P30)
OSC3 clock FOUT3
Output circuit
P30 port
On/off control P30 function selection
P13 function selection
Division ratio selection
FOUT1(P13)
OSC1 clock FOUT1
Output circuit
P13 port
On/off control
Figure 7.6.1: Clock output circuit
FOUT3 output
FOUT3 is the OSC3 division clock.
Output pin setting
The FOUT3 output pin is combined with the P30 port. This functions as the P30 port pin by default, so the
pin function should be changed by writing 1 to P30MUX (D0/P3_PMUX register) if use is required for
FOUT3 output.
* P30MUX: P30 Port Function Select Bit in the P3 Port Function Select (P3_PMUX) Register (D0/0x52a3)
FOUT3 clock frequency selection
Three different clock output frequencies can be selected. Select the division ratio for the OSC3 clock using
FOUT3D[1:0] (D[3:2]/OSC_FOUT register).
* FOUT3D[1:0]: FOUT3 Clock Division Ratio Select Bits in the FOUT Control (OSC_FOUT) Register
(D[3:2]/0x5064)
Table 7.6.1: FOUT3 clock division ratio selection
FOUT3D[1:0] Division ratio
0x3 Reserved
0x2 OSC3-1/4
0x1 OSC3-1/2
0x0 OSC3-1/1
(Default: 0x0)
Clock output control
The clock output is controlled using the FOUT3E (D1/OSC_FOUT register). Setting FOUT3E to 1 outputs
the FOUT3 clock from the FOUT3 pin. Setting it to 0 halts output.
* FOUT3E: FOUT3 Output Enable Bit in the FOUT Control (OSC_FOUT) Register (D1/0x5064)
FOUT3E
FOUT3 output (P30)
0 01
Figure 7.6.2: FOUT3 output
Note: Since the FOUT3 signal is asynchronized with FOUT3E writing, switching output on or off will
generate certain hazards.
7 OSCILLATOR CIRCUIT (OSC)
64 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
FOUT1 output
FOUT1 is the OSC1 clock.
Output pin setting
The FOUT1 output pin is combined with the P13 port. This functions as the P13 port pin by default, so the
pin function should be changed by writing 1 to P13MUX (D3/P1_PMUX register) if use is required for
FOUT1 output.
* P13MUX: P13 Port Function Select Bit in the P1 Port Function Select (P1_PMUX) Register (D3/0x52a1)
Clock output control
The clock output is controlled using the FOUT1E (D0/OSC_FOUT register). Setting FOUT1E to 1 outputs
the FOUT1 clock from the FOUT1 pin. Setting it to 0 halts output.
* FOUT1E: FOUT1 Output Enable Bit in the FOUT Control (OSC_FOUT) Register (D1/0x5064)
FOUT1E
FOUT1 output (P13)
0 01
Figure 7.6.3: FOUT1 output
Note: Since the FOUT1 signal is asynchronized with FOUT1E writing, switching output on or off will
generate certain hazards.
7 OSCILLATOR CIRCUIT (OSC)
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7.7 RESET and NMI Input Noise Filters
Since accidental activation of RESET or NMI by noise in the S1C17 core input signal will cause unintended reset-
ting or NMI processing, the OSC module incorporates noise filters operated by the system clock. The filters remove
noise from these signals before they reach the S1C17 core.
Separate noise filters are used for each signal. You can select to use or bypass them individually. All are active im-
mediately after the initial resetting.
RESET input noise filter: Filters noise when RSTFE (D1/OSC_NFEN register) = 1; bypassed when RSTFE = 0
NMI input noise filter: Filters noise when NMIFE (D0/OSC_NFEN register) = 1; bypassed when NMIFE = 0
* RSTFE: Reset Noise Filter Enable Bit in the Noise Filter Enable (OSC_NFEN) Register (D1/0x5062)
* NMIFE: NMI Noise Filter Enable Bit in the Noise Filter Enable (OSC_NFEN) Register (D0/0x5062)
The noise filters operate using the system clock (OSC3 or OSC1 clock) divided to 1/8. When activated, they filter
out noise with pulses not exceeding two clock cycles.
This means the pulse width must be at least 16 cycles of the system clock to input as a valid signal.
Note: • All noise filters should normally be enabled.
• The S1C17001 does not feature external NMI input pins, but the watchdog timer NMI request
signal passes through these filters.
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66 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
7.8 Control Register Details
Table 7.8.1 OSC register list
Address Register name Function
0x5060 OSC_SRC Clock Source Select Register Clock source selection
0x5061 OSC_CTL Oscillation Control Register Oscillation control
0x5062 OSC_NFEN Noise Filter Enable Register Noise filter on/off
0x5064 OSC_FOUT FOUT Control Register Clock external output control
0x5065 OSC_T8OSC1 T8OSC1 Clock Control Register 8-bit OSC1 timer clock setting
The OSC module registers are described in detail below. These are 8-bit registers.
Note: When data is written to the registers, the “Reserved” bits must always be written as 0 and not 1.
7 OSCILLATOR CIRCUIT (OSC)
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 67
0x5060: Clock Source Select Register (OSC_SRC)
Register name Address Bit Name Function Setting Init. R/W Remarks
Clock Source
Select
Register
(OSC_SRC)
0x5060
(8 bits)
D7–1
–
reserved – – – 0 when being read.
D0 CLKSRC System clock source select 1 OSC1 0 OSC3 0 R/W
D[7:1] Reserved
D0 CLKSRC: System Clock Source Select Bit
Selects the system clock source.
1 (R/W): OSC1
0 (R/W): OSC3 (default)
OSC3 is selected for normal (high-speed) operations. If the OSC3 clock is not required, OSC1 can be
set as the system clock and OSC3 stopped to reduce power consumption.
Note: If the system clock is switched from OSC3 to OSC1 immediately after starting OSC1 oscilla-
tion, the system clock will stop until the OSC1 clock starts up (for the OSC1 clock 256-cycle
period).
7 OSCILLATOR CIRCUIT (OSC)
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0x5061: Oscillation Control Register (OSC_CTL)
Register name Address Bit Name Function Setting Init. R/W Remarks
Oscillation
Control Register
(OSC_CTL)
0x5061
(8 bits)
D7–6 –reserved – – – 0 when being read.
D5–4
OSC3WT[1:0]
OSC3 wait cycle select OSC3WT[1:0] Wait cycle 0x0 R/W
0x3
0x2
0x1
0x0
128 cycles
256 cycles
512 cycles
1024 cycles
D3–2 –reserved – – – 0 when being read.
D1 OSC1EN OSC1 enable 1 Enable 0 Disable 1 R/W
D0 OSC3EN OSC3 enable 1 Enable 0 Disable 1 R/W
D[7:6] Reserved
D[5:4] OSC3WT[1:0]: OSC3 Wait Cycle Select Bits
An oscillation stabilization wait timer is set to prevent malfunctions due to unstable clock operation at
the start of OSC3 oscillation.
The OSC3 clock is not fed to the system immediately after OSC3 oscillation starts—for example, when
power is first turned on, on awaking from SLEEP, or when the OSC3 oscillation circuit is turned on via
software—until the time set here has elapsed.
Table 7.8.2: OSC3 oscillation stabilization wait time settings
OSC3WT[1:0] Oscillation stabilization
wait time
0x3 128 cycles
0x2 256 cycles
0x1 512 cycles
0x0 1,024 cycles
(Default: 0x0)
This is set to 1,024 cycles (OSC3 clock) after initial resetting. The CPU does not begin operating im-
mediately after resetting until this time has elapsed.
Note: The OSC3 oscillation start time depends on the oscillator and externally connected compo-
nents. The time should be set with an adequate oscillation stabilization wait time. Refer to the
typical oscillation start times specified in “24 Electrical Characteristics.”
D1 OSC1EN: OSC1 Enable Bit
Permits or prohibits OSC1 oscillator circuit operation.
1 (R/W): Permitted (on) (default)
0 (R/W): Prohibited (off)
Note: • The OSC1 oscillator circuit cannot be stopped if the OSC1 clock is being used as the system
clock.
• The OSC1 clock is not fed to the system for 256 cycles to prevent malfunctions immediately af-
ter OSC1 oscillation is started by changing the OSC1EN setting from 0 to 1.
D0 OSC3EN: OSC3 Enable Bit
Permits or prohibits OSC3 oscillator circuit operation.
1 (R/W): Permitted (on) (default)
0 (R/W): Prohibited (off)
Note: The OSC3 oscillator circuit cannot be stopped if the OSC3 clock is being used as the system
clock.
7 OSCILLATOR CIRCUIT (OSC)
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0x5062: Noise Filter Enable Register (OSC_NFEN)
Register name Address Bit Name Function Setting Init. R/W Remarks
Noise Filter
Enable Register
(OSC_NFEN)
0x5062
(8 bits)
D7–2 –reserved – – – 0 when being read.
D1 RSTFE Reset noise filter enable 1 Enable 0 Disable 1 R/W
D0 NMIFE NMI noise filter enable 1 Enable 0 Disable 1 R/W
D1 RSTFE: Reset Noise Filter Enable Bit
Enables or disables the RESET input noise filter.
1 (R/W): Enabled (noise filtering) (default)
0 (R/W): Disabled (bypass)
This noise filter inputs only RESET pulses of not less than 16 cycles of the system clock (OSC3 or
OSC1 clock) to the S1C17 core. Pulses having widths of less than 16 cycles are filtered out as noise.
This should normally be enabled.
D0 NMIFE: NMI Noise Filter Enable Bit
Enables or disables the NMI input noise filter.
1 (R/W): Enabled (noise filtering) (default)
0 (R/W): Disabled (bypass)
This noise filter inputs only NMI pulses of not less than 16 cycles of the system clock (OSC3 or OSC1
clock) to the S1C17 core. Pulses having widths of less than 16 cycles are filtered out as noise. This
should normally be enabled.
Note: The S1C17001 does not feature external NMI input pins, but the watchdog timer NMI request
signal passes through these filters.
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0x5064: FOUT Control Register (OSC_FOUT)
Register name Address Bit Name Function Setting Init. R/W Remarks
FOUT Control
Register
(OSC_FOUT
)
0x5064
(8 bits)
D7–4 –reserved – – – 0 when being read.
D3–2
FOUT3D[1:0]
FOUT3 clock division ratio select FOUT3D[1:0] Division ratio 0x0 R/W
0x3
0x2
0x1
0x0
reserved
OSC3-1/4
OSC3-1/2
OSC3-1/1
D1 FOUT3E FOUT3 output enable 1 Enable 0 Disable 0 R/W
D0 FOUT1E FOUT1 output enable 1 Enable 0 Disable 0 R/W
D[7:4] Reserved
D[3:2] FOUT3D[1:0]: FOUT3 Clock Division Ratio Select Bits
Select the OSC3 clock division ratio to set the FOUT3 clock frequency.
Table 7.8.3: FOUT3 clock division ratio selection
FOUT3D[1:0] Division ratio
0x3 Reserved
0x2 OSC3-1/4
0x1 OSC3-1/2
0x0 OSC3-1/1
(Default: 0x0)
D1 FOUT3E: FOUT3 Output Enable Bit
Permits or prohibits FOUT3 clock (OSC3 division clock) external output.
1 (R/W): Permitted (on)
0 (R/W): Prohibited (off) (default)
Setting FOUT3E to 1 outputs the FOUT3 clock from the FOUT3 pin. Setting it to 0 stops the output.
The FOUT3 output pin is combined with the P30 port. This functions as the P30 port pin by default, so
the pin function should be changed by writing 1 to P30MUX (D0/P3_PMUX register) if use is required
for FOUT3 output.
* P30MUX: P30 Port Function Select Bit in the P3 Port Function Select (P3_PMUX) Register
(D0/0x52a3)
D0 FOUT1E: FOUT1 Output Enable Bit
Permits or prohibits FOUT1 clock (OSC1 clock) external output.
1 (R/W): Permitted (on)
0 (R/W): Prohibited (off) (default)
Setting FOUT1E to 1 outputs the FOUT1 clock from the FOUT1 pin. Setting it to 0 stops the output.
The FOUT1 output pin is combined with the P13 port. This functions as the P13 port pin by default, so
the pin function should be changed by writing 1 to P13MUX (D3/P1_PMUX register) if use is required
for FOUT1 output.
* P13MUX: P13 Port Function Select Bit in the P1 Port Function Select (P1_PMUX) Register
(D3/0x52a1)
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0x5065: T8OSC1 Clock Control Register (OSC_T8OSC1)
Register name Address Bit Name Function Setting Init. R/W Remarks
T8OSC1 Clock
Control Register
(OSC_T8OSC1
)
0x5065
(8 bits)
D7–4 –reserved – – – 0 when being read.
D3–1
T8O1CK[2:0]
T8OSC1 clock division ratio select T8O1CK[2:0] Division ratio 0x0 R/W
0x7–0x6
0x5
0x4
0x3
0x2
0x1
0x0
reserved
OSC1-1/32
OSC1-1/16
OSC1-1/8
OSC1-1/4
OSC1-1/2
OSC1-1/1
D0 T8O1CE T8OSC1 clock output enable 1 Enable 0 Disable 0 R/W
D[7:4] Reserved
D[3:1] T8O1CK[2:0]: T8OSC1 Clock Division Ratio Select Bits
Select the OSC1 clock division ratio and set the 8-bit OSC1 timer operation clock.
Table 7.8.4: T8OSC1 clock division ratio selection
T8O1CK[2:0] Division ratio
0x7 to 0x6 Reserved
0x5 OSC1-1/32
0x4 OSC1-1/16
0x3 OSC1-1/8
0x2 OSC1-1/4
0x1 OSC1-1/2
0x0 OSC1-1/1
(Default: 0x0)
D0 T8O1CE: T8OSC1 Clock Output Enable Bit
Permits or prohibits clock feed to the 8-bit OSC1 timer.
1 (R/W): Permitted (on)
0 (R/W): Prohibited (off) (default)
The T8O1CE default setting is 0, which stops the clock feed. Setting T8O1CE to 1 sends the clock
selected by the above bit to the 8-bit OSC1 timer. Stop the clock feed to reduce power consumption if
8-bit OSC1 timer operation is not required.
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7.9 Precautions
• The OSC3 oscillation start time depends on the oscillator and externally connected components. The time should
be set with an adequate OSC3 oscillation stabilization wait time. Refer to the typical oscillation start times speci-
fied in “24 Electrical Characteristics.”
• Switching the system clock from OSC3 to OSC1 immediately after starting OSC1 oscillation will stop the sys-
tem clock until the OSC1 clock starts up (for the OSC1 clock 256-cycle period).
• The OSC3 oscillator circuit cannot be stopped if the OSC3 clock is being used as the system clock.
• The OSC1 oscillator circuit cannot be stopped if the OSC1 clock is being used as the system clock.
• Since the FOUT3/FOUT1 signal is asynchronized with FOUT3E/FOUT1E writing, switching output on or off
will generate certain hazards.
8 CLOCK GENERATOR (CLG)
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8.ClockGenerator(CLG)
8.1 Clock Generator Configuration
The clock generator controls the system clock feed to the S1C17 core and peripheral modules.
Figure 8.1.1 illustrates the clock system and CLG module configuration.
OSC3
CCLK
OSC1
OSC1
FOUT3
output circuit
OSC3
oscillator circuit
(8.2 MHz)
OSC1
oscillator circuit
(32.768 kHz)
Wait circuit for
wakeup Clock gear
(1/1 to 1/8)
Gate S1C17 core
BCLK Internal bus, RAM,
ROM
ITC, T16, T8F, UART,
SPI, I2C, T16E, P,
MISC, REMC,
Control register (CT,
SWT, WDT, T8OSC1)
PCLK
CLK_256Hz
OSC3
OSC4
FOUT3
FOUT1
output circuit
FOUT1
Noise filter
RESET
OSC1
OSC2
SLEEP, on/off control
Gear selection
wakeup HALT
On/off control
S1C17 core
S1C17 core
Division ratio selection On/off control
On/off control
On/off control
SLEEP, on/off control
Noise filter
NMI
On/off control
Division
circuit
CT, SWT, WDT
T8OSC1
Gate
Gate
On/off control
On/off control
Gate
CLG
PSC
OSC
T8F, T16, T16E,
REMC, P, UART, SPI,
I2C
Gate
HALT
Clock source
selection
System
clock
Division circuit
(1/1 to 1/4)
Division ratio
selection
(1/1 to 1/32)
(1/128)
Division circuit
(1/1 to 1/16K)
Figure 8.1.1: CLG module configuration
To reduce power consumption, control the clock in conjunction with processing and use standby mode. For more
information on reducing power consumption, refer to “Appendix B: Power Saving.”
8 CLOCK GENERATOR (CLG)
74 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
8.2 CPU Core Clock (CCLK) Control
The CLG module incorporates a clock gear to slow down the system clock to send to the S1C17 core. To reduce
power consumption, operate the S1C17 core with the slowest possible clock speed. The halt command can be ex-
ecuted to stop the clock feed from the CLG to the S1C17 core for power savings.
OSC3 CCLK
OSC1
Cock gear
(1/1 to 1/8)
Gate S1C17 core
Gear selection
System clock
HALT
Figure 8.2.1: CCLK feed system
Clock gear settings
CCLKGR[1:0] (D[1:0]/CLG_CCLK register) is used to select the gear ratio to reduce system clock speeds.
*
CCLKGR[1:0]: CCLK Clock Gear Ratio Select Bits in the CCLK Control (CLG_CCLK) Register (D[1:0]/0x5081
)
Table 8.2.1: CCLK gear ratio selection
CCLKGR[1:0] Gear ratio
0x3 1/8
0x2 1/4
0x1 1/2
0x0 1/1
(Default: 0x0)
Clock feed control
The CCLK clock feed is stopped by executing the halt command. Since this does not stop the system clock, pe-
ripheral modules will continue to operate.
HALT mode is cleared by resetting, NMI, or other interrupts. The CCLK feed resumes when HALT mode is
cleared.
Executing the slp command suspends system clock feed to the CLG, thereby halting the CCLK feed as well.
Clearing SLEEP mode with an external interrupt restarts the system clock feed and the CCLK feed.
For more information on system clock control, refer to “7. Oscillator Circuit (OSC).”
8 CLOCK GENERATOR (CLG)
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8.3 Peripheral Module Clock (PCLK) Control
The CLG module also controls the clock feed to peripheral modules.
The system clock is used unmodified for the peripheral module clock (PCLK).
Internal peripheral circuits
• Prescaler
• UART
• 8-bit timer
• 16-bit timer Ch.0 to 2
• Interrupt controller
• SPI
• I2C
• P port & port MUX
• PWM & capture timer
• MISC register
• Remote controller
• Control register for the
modules listed below
Clock timer
Stopwatch timer
Watchdog timer
8-bit OSC1 timer
Gate
On/off control
PCLK
OSC3
OSC1
System clock
Figure 8.3.1: Peripheral module clock control circuit
Clock feed control
PCLK feed is controlled by PCKEN[1:0] (D[1:0]/CLG_PCLK register).
* PCKEN[1:0]: PCLK Enable Bits in the PCLK Control (CLG_PCLK) Register (D[1:0]/0x5080)
Table 8.3.1: PCLK control
PCKEN[1:0] PCLK feed
0x3 Permitted (on)
0x2 Setting prohibited
0x1 Setting prohibited
0x0 Prohibited (off)
(Default: 0x3)
The default setting is 0x3, which enables the clock feed. Stop the clock feed to reduce power consumption un-
less all peripheral modules (modules listed above) within the internal peripheral circuit area need to be running.
Note: Do not set PCKEN[1:0] (D[1:0]/CLG_PCLK register) to 0x2 or 0x1, since doing so will stop the
operation of certain peripheral modules.
Peripheral modules not operating on PCLK
With the exception of control register access, the clock timer, stopwatch timer, watchdog timer, and 8-bit OSC1
timer operate using the OSC1 division clock. Stopping the PCLK prevents read/write access to/from the control
register, but operation will continue.
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8.4 Control Register Details
Table 8.4.1 CLG register list
Address Register name Function
0x5080 CLG_PCLK PCLK Control Register PCLK feed control
0x5081 CLG_CCLK CCLK Control Register CCLK division ratio setting
The CLG module registers are described in detail below. These are 8-bit registers.
Note: When data is written to the registers, the “Reserved” bits must always be written as 0 and not 1.
8 CLOCK GENERATOR (CLG)
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0x5080: PCLK Control Register (CLG_PCLK)
Register name Address Bit Name Function Setting Init. R/W Remarks
PCLK Control
Register
(CLG_PCLK
)
0x5080
(8 bits)
D7–2 –reserved – – – 0 when being read.
D1–0 PCKEN[1:0] PCLK enable PCKEN[1:0] PCLK supply 0x3 R/W
0x3
0x2
0x1
0x0
Enable
Not allowed
Not allowed
Disable
D[7:2] Reserved
D[1:0] PCKEN[1:0]: PCLK Enable Bits
Permit or prohibit clock (PCLK) feed to internal peripheral modules.
Table 8.4.2: PCLK control
PCKEN[1:0] PCLK feed
0x3 Permitted (on)
0x2 Setting prohibited
0x1 Setting prohibited
0x0 Prohibited (off)
(Default: 0x3)
The PCKEN[1:0] default setting is 0x3, which enables clock feed. Stop the clock feed to reduce power
consumption if the peripheral modules listed below are not required.
Peripheral modules operated using PCLK
• Prescaler (PWM & capture timer, remote controller, P port)
• UART
• 8-bit timer
• 16-bit timer Ch.0 to 2
• Interrupt controller
• SPI
• I2C
• P port & port MUX
• PWM & capture timer
• MISC register
• Remote controller
Since the following peripheral modules are not operated using PCLK except for control register access,
PCLK is not required after setting the control register to start operations.
• Clock timer
• Stopwatch timer
• Watchdog timer
• 8-bit OSC1 timer
Note: Do not set PCKEN[1:0] to 0x2 or 0x1, since doing so will stop the operation of certain pe-
ripheral modules.
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0x5081: CCLK Control Register (CLG_CCLK)
Register name Address Bit Name Function Setting Init. R/W Remarks
CCLK Control
Register
(CLG_CCLK
)
0x5081
(8 bits)
D7–2 –reserved – – – 0 when being read.
D1–0 CCLK-
GR[1:0]
CCLK clock gear ratio select CCLKGR[1:0] Gear ratio 0x0 R/W
0x3
0x2
0x1
0x0
1/8
1/4
1/2
1/1
D[7:2] Reserved
D[1:0] CCLKGR[1:0]: CCLK Clock Gear Ratio Select Bits
Select the gear ratio for reducing system clock speed and set the CCLK clock speed for operating the
S1C17 core. To reduce power consumption, operate the S1C17 core using the slowest possible clock
speed.
Table 8.4.3: CCLK gear ratio selection
CCLKGR[1:0] Gear ratio
0x3 1/8
0x2 1/4
0x1 1/2
0x0 1/1
(Default: 0x0)
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8.5 Precautions
(1) The default settings enable PCLK feed to peripheral modules. To reduce power consumption, stop the clock
feed if the peripheral modules listed below are not used.
Peripheral modules operated using PCLK
• Prescaler (PWM & capture timer, remote controller, P port)
• UART
• 8-bit timer
• 16-bit timer Ch.0 to 2
• Interrupt controller
• SPI
• I2C
• P port & port MUX
• PWM & capture timer
• MISC register
• Remote controller
Since the following peripheral modules are not operated using PCLK except for control register access, PCLK
is not required after setting the control register to start operations.
• Clock timer
• Stopwatch timer
• Watchdog timer
• 8-bit OSC1 timer
(2) Do not set PCKEN[1:0] (D[1:0]/CLG_PCLK register) to 0x2 or 0x1, since doing so will stop the operation of
certain peripheral modules.
* PCKEN[1:0]: PCLK Enable Bits in the PCLK Control (CLG_PCLK) Register (D[1:0]/0x5080)
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9 PRESCALER (PSC)
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9.Prescaler(PSC)
9.1 Prescaler Configuration
The S1C17001 incorporates a prescaler to generate a clock for timer operations. The prescaler generates 15 differ-
ent frequencies by dividing the PCLK clock fed from the clock generator into 1/1 to 1/16K. The peripheral modules
to which the clock is fed include clock selection registers enabling selection of one as a count or operation clock.
1/1
PCLK
Debug status
signal
PSC
1/2 1/4 1/8 1/16 1/32 1/64 1/128
1/256 1/512 1/1K 1/2K 1/4K 1/8K 1/16K
8-bit timer
16-bit timer Ch.0
16-bit timer Ch.1
16-bit timer Ch.2
UART
SPI
I2C
PWM & capture timer
Remote controller
P port
Figure 9.1.1: Prescaler
The prescaler is controlled by the PRUN bit (D0/PSC_CTL register). To operate the prescaler, write 1 to PRUN.
Writing 0 to PRUN stops the prescaler. Stopping the prescaler while the timer and interface module are halted en-
ables the current consumption to be reduced. The prescaler is stopped immediately after initial resetting.
* PRUN: Prescaler Run/Stop Control Bit in the Prescaler Control (PSC_CTL) Register (D0/0x4020)
Note: PCLK must be fed from the clock generator to use the prescaler.
The prescaler features another control bit, PRUND (D1/PSC_CTL register), which specifies prescaler operations
in Debug mode. Setting PRUND to 1 also operates the prescaler in Debug mode. Setting it to 0 stops the prescaler
once the S1C17 core switches to Debug mode. Set PRUND to 1 if the timer and interface module are to be used
during debugging.
* PRUND: Prescaler Run/Stop Setting Bit in Debug Mode in the Prescaler Control (PSC_CTL) Register (D1/0x4020)
9 PRESCALER (PSC)
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9.2 Control Register Details
Table 9.2.1: Prescaler register
Address Register name Function
0x4020 PSC_CTL Prescaler Control Register Prescaler start/stop control
The prescaler register is an 8-bit register.
Note: When data is written to the registers, the “Reserved” bits must always be written as 0 and not 1.
0x4020: Prescaler Control Register (PSC_CTL)
Register name Address Bit Name Function Setting Init. R/W Remarks
Prescaler
Con-
trol Register
(PSC_CTL)
0x4020
(8 bits)
D7–2 –reserved – – – 0 when being read.
D1 PRUND Prescaler run/stop in debug mode 1 Run 0 Stop 0 R/W
D0 PRUN Prescaler run/stop control 1 Run 0 Stop 0 R/W
D[7:2] Reserved
D1 PRUND: Prescaler Run/Stop Setting Bit for Debug Mode
Selects prescaler operations in Debug mode.
1 (R/W): Operate
0 (R/W): Stop (default)
Setting PRUND to 1 operates the prescaler even in Debug mode. Setting it to 0 stops the prescaler once
the S1C17 core switches to Debug mode. Set PRUND to 1 to use the timer and interface module during
debugging.
D0 PRUN: Prescaler Run/Stop Control Bit
Starts or stops prescaler operation.
1 (R/W): Start operation
0 (R/W): Stop (default)
Write 1 to PRUN to operate the prescaler. Write 0 to PRUN to stop the prescaler. To reduce current con-
sumption, stop the prescaler if the timer and interface module are already stopped.
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9.3 Precautions
PCLK must be fed from the clock generator to use the prescaler.
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10 Input/Output Port (P)
10.1 Input/Output Port Configuration
The S1C17001 includes 28 input/output ports (P0[7:0], P1[7:0], P2[7:0], P3[3:0]) to allow software switching of
input/output direction. These share internal peripheral module input/output pins (with certain exceptions), but pins
not used for peripheral modules can be used as general purpose input/output ports.
Figure 10.1.1 illustrates the input/output port configuration.
HVDD
VSS
Internal data bus
Pxy
Peripheral module input
Peripheral module output
Peripheral module I/O control
PxPUy
PxIOy
PxOUTy
PxyMUX
Pull-up enable
Input/output direction selection
Output data
Function selection
Figure 10.1.1: Input/output port configuration
The P0 and P1 ports can generate input interrupts.
The P0[3:0] port can be used for key entry resets. (For more information, refer to “5.1.2 P0 Port Key Entry Reset.”)
Note: The PCLK clock must be fed from the clock generator to access the input/output port.
The prescaler output clock is also needed to operate the P0 port chattering filter. Switch on
the prescaler when using this function.
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10.2 Input/Output Pin Function Selection (Port MUX)
The input/output port pins share peripheral module input/output pins (with certain exceptions). Each pin can be set
for use as an input/output port or for peripheral modules via the corresponding port function selection bits for each
port. Pins not used for peripheral modules can be used as general purpose input/output ports.
Table 10.2.1: Input/output pin function selection
Pin function 1
PxxMUX = 0
Pin function 2
PxxMUX = 1
Port function
selection bit Control register
P00 – – –
P01 – – –
P02 – – –
P03 – – –
P04 REMI (REMC) P04MUX (D4) P0 Port Function Select (P0_PMUX) Register (0x52a0)
P05 REMO (REMC) P05MUX (D5)
P06/EXCL2 (T16CH2) – – –
P07/EXCL1 (T16CH1) – – –
P10 – – –
P11 – – –
P12 – – –
P13 FOUT1 (OSC) P13MUX (D3) P1 Port Function Select (P1_PMUX) Register (0x52a1)
P14 SDA (I2C) P14MUX (D4)
P15 SCL (I2C) P15MUX (D5)
P16/EXCL0 (T16CH0) – – –
P17 #SPISS (SPI) P17MUX (D7) P1 Port Function Select (P1_PMUX) Register (0x52a1)
P20 SDI (SPI) P20MUX (D0) P2 Port Function Select (P2_PMUX) Register (0x52a2)
P21 SDO (SPI) P21MUX (D1)
P22 SPICLK (SPI) P22MUX (D2)
P23 SIN (UART) P23MUX (D3)
P24 SOUT (UART) P24MUX (D4)
P25 SCLK (UART) P25MUX (D5)
P26 TOUT (T16E) P26MUX (D6)
P27 EXCL3 (T16E) P27MUX (D7)
P30 FOUT3 (OSC) P30MUX (D0) P3 Port Function Select (P3_PMUX) Register (0x52a3)
DCLK (DBG) P31 P31MUX (D1)
DST2 (DBG) P32 P32MUX (D2)
DSIO (DBG) P33 P33MUX (D3)
Resetting the input/output port pins (Pxx) resets them to their default functions (pin function 1 in Table 10.2.1).
Pins P06, P07, and P16 can also be used as 16-bit timer external clock input pins by setting them to input mode.
Note, however, that no port function selection bits are available, since they are simultaneously set to function as
general purpose input ports.
For information on functions other than the input/output ports, refer to the discussion of the peripheral modules in-
dicated in parentheses. The sections below discuss port functions with the pins set as general purpose input/output
ports.
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10.3 Data Input/Output
The input/output ports permit selection of the data input/output direction for each bit using PxIO[7:0] (Px_IO regis-
ter).
* P0IO[7:0]: P0[7:0] Port I/O Direction Select Bits in the P0 Port I/O Direction Control (P0_IO) Register (D[7:0]/0x5202)
* P1IO[7:0]: P1[7:0] Port I/O Direction Select Bits in the P1 Port I/O Direction Control (P1_IO) Register (D[7:0]/0x5212)
* P2IO[7:0]: P2[7:0] Port I/O Direction Select Bits in the P2 Port I/O Direction Control (P2_IO) Register (D[7:0]/0x5222)
* P3IO[3:0]: P3[3:0] Port I/O Direction Select Bits in the P3 Port I/O Direction Control (P3_IO) Register (D[3:0]/0x5232)
The input/output direction for the port selecting the peripheral module function is controlled by the peripheral mod-
ule. The PxIO[7:0] setting is ignored.
Data input
When set to input mode, PxIO[7:0] is set to 0 (default). The input/output port set to input mode switches to
high-impedance state, and functions as the input port. If pull-up is enabled by the Px_PU register, the port will
be pulled up.
In input mode, the input pin state can be read out directly from PxIN[7:0] (Px_IN register). The value read will
be 1 when the input pin is at High (HVDD) level and 0 when it is at Low (VSS) level.
* P0IN[7:0]: P0[7:0] Port Input Data Bits in the P0 Port Input Data (P0_IN) Register (D[7:0]/0x5200)
* P1IN[7:0]: P1[7:0] Port Input Data Bits in the P1 Port Input Data (P1_IN) Register (D[7:0]/0x5210)
* P2IN[7:0]: P2[7:0] Port Input Data Bits in the P2 Port Input Data (P2_IN) Register (D[7:0]/0x5220)
* P3IN[3:0]: P3[3:0] Port Input Data Bits in the P3 Port Input Data (P3_IN) Register (D[3:0]/0x5230)
Data output
When set to output mode, PxIO[7:0] is set to 1. The input/output port set to output mode functions as the output
port, while the port pin outputs High (HVDD) level if PxOUT[7:0] (Px_OUT register) is written as 1 and outputs
Low (VSS) level if written as 0. Note that the port will not be pulled up in output mode even if pull-up is en-
abled by the Px_PU register.
* P0OUT[7:0]: P0[7:0] Port Output Data Bits in the P0 Port Output Data (P0_OUT) Register (D[7:0]/0x5201)
* P1OUT[7:0]: P1[7:0] Port Output Data Bits in the P1 Port Output Data (P1_OUT) Register (D[7:0]/0x5211)
* P2OUT[7:0]: P2[7:0] Port Output Data Bits in the P2 Port Output Data (P2_OUT) Register (D[7:0]/0x5221)
* P3OUT[3:0]: P3[3:0] Port Output Data Bits in the P3 Port Output Data (P3_OUT) Register (D[3:0]/0x5231)
Writing to PxOUT[7:0] is possible without affecting pin status, even in input mode.
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10.4 Pull-up Control
The input/output port contains a pull-up resistor, which you can choose to use or not use individually for each bit
using the PxPU[7:0] (Px_PU register).
* P0PU[7:0]: P0[7:0] Port Pull-up Enable Bits in the P0 Port Pull-up Control (P0_PU) Register (D[7:0]/0x5203)
* P1PU[7:0]: P1[7:0] Port Pull-up Enable Bits in the P1 Port Pull-up Control (P1_PU) Register (D[7:0]/0x5213)
* P2PU[7:0]: P2[7:0] Port Pull-up Enable Bits in the P2 Port Pull-up Control (P2_PU) Register (D[7:0]/0x5223)
* P3PU[3:0]: P3[3:0] Port Pull-up Enable Bits in the P3 Port Pull-up Control (P3_PU) Register (D[3:0]/0x5233)
Setting PxPU[7:0] to 1 (default) enables the pull-up resistor and pulls up the port pin in input mode. It will not be
pulled up if set to 0.
The PxPU[7:0] setting is disabled in output mode, and the pin is not pulled up.
Input/output ports that are not used should be set with pull-up enabled.
This pull-up setting is also enabled for ports for which the peripheral module function has been selected.
A delay will occur in the waveform rise-up depending on time constants such as pull-up resistance and pin load
capacitance if the port pin is switched from Low level to High level by the internal pull-up resistor. An appropriate
wait time must be set for the input/output port loading. The wait time set should be a value not less than that calcu-
lated from the following equation.
Wait time = RIN x (CIN + load capacitance on board) x 1.6 [s]
RIN: pull-up resistance maximum value
CIN: pin capacitance maximum value
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10.5 Input Interface Level
The S1C17001 input interface level is pegged to the CMOS mute level.
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10.6 P0 Port Chattering Filter Function
The P0 port includes a chattering filter circuit for key entry, which you can select to use or not use (and for which
you can select a verification time if used) individually for the four P0[3:0] and P0[7:4] ports using P0CFx[2:0] (P0_
CHAT register).
* P0CF1[2:0]: P0[3:0] Chattering Filter Time Select Bits in the P0 Port Chattering Filter Control (P0_CHAT)
Register (D[2:0]/0x5208)
* P0CF2[2:0]: P0[7:4] Chattering Filter Time Select Bits in the P0 Port Chattering Filter Control (P0_CHAT)
Register (D[6:4]/0x5208)
Table 10.6.1: Chattering filter function settings
P0CFx[2:0] Verification time *
0x7 16384/fPCLK (8ms)
0x6 8192/fPCLK (4ms)
0x5 4096/fPCLK (2ms)
0x4 2048/fPCLK (1ms)
0x3 1024/fPCLK (512µs)
0x2 512/fPCLK (256µs)
0x1 256/fPCLK (128µs)
0x0 No verification time
(Off)
(Default: 0x0, *when OSC3 = 2 MHz and PCLK = OSC3)
Note: • The chattering filter verification time refers to the maximum pulse width that can be filtered.
Generating an input interrupt requires a minimum input time of the verification time and a maxi-
mum input time of twice the verification time.
• Input interrupts will not be accepted for a transition into SLEEP mode with the chattering filter
left on. The chattering filter should be set off (no verification time) before executing the slp com-
mand.
• P0 port interrupts must be blocked when P0_CHAT register (0x5208) settings are being
changed. Changing the setting while interrupts are permitted may generate inadvertent P0 in-
terrupts.
• A phenomenon may occur in which the internal signal oscillates due to the time elapsed until
the signal reaches the threshold value if the input signal rise-up/drop-off time is delayed. Since
input interrupts will malfunction under these conditions, the input signal rise-up/drop-off time
should normally be set to 25 ns or less.
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10.7 Port Input Interrupt
Ports P0 and P1 include input interrupt functions.
Select which of the 16 ports are to be used for interrupts based on requirements. You can also select whether inter-
rupts are generated for either the rising edge or falling edge of input signals.
Figure 10.7.1 illustrates the port input interrupt circuit configuration.
Chattering filter
Interrupt flag
Interrupt enable
Interrupt edge selection
P00 P0CF1[2:0]
P0EDGE0
P0IF0
P0IE0
P07 P0CF2[2:0]
P0EDGE7
P0IF7
P0IE7
• • •
P10
P1EDGE0
P1IF0
P1IE0
P17
P1EDGE7
P1IF7
P1IE7
• • •
P0 port
interrupt
request
(to ITC)
P1 port
interrupt
request
(to ITC)
Figure 10.7.1: Port input interrupt circuit configuration
Interrupt port selection
Select the port generating an interrupt using PxIE[7:0] (Px_IMSK register).
* P0IE[7:0]: P0[7:0] Port Interrupt Enable Bits in the P0 Port Interrupt Mask (P0_IMSK) Register (D[7:0]/0x5205)
* P1IE[7:0]: P1[7:0] Port Interrupt Enable Bits in the P1 Port Interrupt Mask (P1_IMSK) Register (D[7:0]/0x5215)
Setting PxIE[7:0] to 1 enables interrupt generation by the corresponding port. Setting to 0 (default) disables in-
terrupt generation.
The interrupt controller must also be set to actually generate an interrupt. For more information on making in-
terrupt controller settings, refer to “6. Interrupt Controller (ITC).”
Interrupt edge selection
Port input interrupts can be generated at either the rising edge or falling edge of the input signal. Select the edge
used to generate interrupts using PxEDGE[7:0] (Px_EDGE register).
* P0EDGE[7:0]: P0[7:0] Port Interrupt Edge Select Bits in the P0 Port Interrupt Edge Select (P0_EDGE)
Register (D[7:0]/0x5206)
* P1EDGE[7:0]: P1[7:0] Port Interrupt Edge Select Bits in the P1 Port Interrupt Edge Select (P1_EDGE)
Register (D[7:0]/0x5216)
Setting PxEDGE[7:0] to 1 generates port input interrupts at the input signal falling edge. Setting it to 0 (default)
generates interrupts at the rising edge.
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Interrupt flags in P port module
The ITC is able to accept interrupt requests for both P0 and P1 port interrupts, and the P port module contains
interrupt flags PxIF[7:0] corresponding to the individual 16 ports to enable individual control of the 16 P0[7:0]
and P1[7:0] port interrupts. Setting the corresponding PxIE[7:0] to 1 sets PxIF[7:0] to 1 at the specified edge
(rising or falling edge) of the input signal. A P0 or P1 port interrupt request signal is also output to the ITC at
the same time. This interrupt request signal causes the P0/P1 port interrupt flag inside the ITC to be set to 1.
Meeting the ITC and S1C17 core interrupt conditions generates an interrupt.
* P0IF[7:0]: P0[7:0] Port Interrupt Flags in the P0 Port Interrupt Flag (P0_IFLG) Register (D[7:0]/0x5207)
* P1IF[7:0]: P1[7:0] Port Interrupt Flags in the P1 Port Interrupt Flag (P1_IFLG) Register (D[7:0]/0x5217)
The following processing is needed to manage the interrupt factor occurrence state using the P port module in-
terrupt flags.
1. Set the ITC P0 and P1 interrupt trigger mode to level trigger mode.
2. Reset the P port module interrupt flag PxIF[7:0] within the interrupt processing routine after the interrupt oc-
curs (this also resets the ITC interrupt flag).
PxIF[7:0] is reset by writing as 1.
Note: To prevent generating unnecessary interrupts, reset the relevant PxIF[7:0] before permitting
interrupts for the required port using PxIE[7:0] (Px_IMSK register).
Port interrupt ITC register
A P0 or P1 port interrupt signal is output to the ITC if the port for which interrupts are permitted as previously
set detects the specified edge of an input signal.
The interrupt level and interrupt permission should be set for the ITC register in order to generate a port inter-
rupt.
Table 10.7.1 illustrates the port interrupt ITC control bits.
Table 10.7.1: ITC control bits
Port Interrupt flag Interrupt enable Interrupt level setting Trigger mode setting
P0 EIFT0 (D0/ITC_IFLG) EIEN0 (D0/ITC_EN) EILV0[2:0] (D[2:0]/ITC_ELV0) EITG0 (D4/ITC_ELV0)
P1 EIFT1 (D1/ITC_IFLG) EIEN1 (D1/ITC_EN) EILV1[2:0] (D[10:8]/ITC_ELV0) EITG1 (D12/ITC_ELV0)
ITC_IFLG register (0x4300)
ITC_EN register (0x4302)
ITC_ELV0 register (0x4306)
The relevant ITC interrupt flag is set to 1 when the P0 or P1 port interrupt signal is activated. When the inter-
rupt enable bit corresponding to that interrupt flag is set to 1, the ITC sends an interrupt request to the S1C17
core. To block port interrupts, set the interrupt enable bit to 0. The interrupt flag is set to 1 by the P0 or P1 port
interrupt signal regardless of the interrupt enable bit setting (even if set to 0).
The interrupt level setting bit sets the port interrupt level (0 to 7). The P0 port takes precedence if the same in-
terrupt level is set.
As previously mentioned, the port interrupt trigger mode setting bit must always be set to 1 (level trigger).
The S1C17 core accepts interrupts when all of the following conditions are met:
• Interrupt enable bit is set to 1
• The PSR (S1C17 core internal processor status register) IE (interrupt enable) bit is set to 1.
• The port interrupt has a higher set interrupt level than the PSR IL (interrupt level).
• No other interrupt factors having higher precedence (e.g., NMI) are present.
For more information on these interrupt control registers and procedures for when an interrupt occurs, refer to “6
Interrupt Controller (ITC).”
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Interrupt vector
The port interrupt vector numbers and vector addresses are as shown below.
Table 10.7.2: Port interrupt vectors
Port Vector number Vector address
P0 4 (0x04) 0x8010
P1 5 (0x05) 0x8014
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10.8 Control Register Details
Table 10.8.1: Input/output port control register list
Address Register name Function
0x5200 P0_IN P0 Port Input Data Register P0 port input data
0x5201 P0_OUT P0 Port Output Data Register P0 port output data
0x5202 P0_IO P0 Port I/O Direction Control Register P0 port input/output direction selection
0x5203 P0_PU P0 Port Pull-up Control Register P0 port pull-up control
0x5205 P0_IMSK P0 Port Interrupt Mask Register P0 port interrupt mask setting
0x5206 P0_EDGE P0 Port Interrupt Edge Select Register P0 port interrupt edge selection
0x5207 P0_IFLG P0 Port Interrupt Flag Register P0 port interrupt occurrence status display/reset
0x5208 P0_CHAT P0 Port Chattering Filter Control Register P0 port chattering filter control
0x5209 P0_KRST P0 Port Key-Entry Reset Configuration Register P0 port key entry reset setting
0x5210 P1_IN P1 Port Input Data Register P1 port input data
0x5211 P1_OUT P1 Port Output Data Register P1 port output data
0x5212 P1_IO P1 Port I/O Direction Control Register P1 port input/output direction selection
0x5213 P1_PU P1 Port Pull-up Control Register P1 port pull-up control
0x5215 P1_IMSK P1 Port Interrupt Mask Register P1 port interrupt mask setting
0x5216 P1_EDGE P1 Port Interrupt Edge Select Register P1 port interrupt edge selection
0x5217 P1_IFLG P1 Port Interrupt Flag Register P1 port interrupt occurrence status display/reset
0x5220 P2_IN P2 Port Input Data Register P2 port input data
0x5221 P2_OUT P2 Port Output Data Register P2 port output data
0x5222 P2_IO P2 Port I/O Direction Control Register P2 port input/output direction selection
0x5223 P2_PU P2 Port Pull-up Control Register P2 port pull-up control
0x5230 P3_IN P3 Port Input Data Register P3 port input data
0x5231 P3_OUT P3 Port Output Data Register P3 port output data
0x5232 P3_IO P3 Port I/O Direction Control Register P3 port input/output direction selection
0x5233 P3_PU P3 Port Pull-up Control Register P3 port pull-up control
0x52a0 P0_PMUX P0 Port Function Select Register P0 port function selection
0x52a1 P1_PMUX P1 Port Function Select Register P1 port function selection
0x52a2 P2_PMUX P2 Port Function Select Register P2 port function selection
0x52a3 P3_PMUX P3 Port Function Select Register P3 port function selection
The input/output port registers are described in detail below. These are 8-bit registers.
Note: When data is written to the registers, the “Reserved” bits must always be written as 0 and not 1.
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0x5200/0x5210/0x5220/0x5230: Px Port Input Data Registers (Px_IN)
Register name Address Bit Name Function Setting Init. R/W Remarks
P0 Port Input
Data Register
(P0_IN)
0x5200
(8 bits)
D7–0 P0IN[7:0] P0[7:0] port input data 1 1 (H) 0 0 (L) × R
P1 Port Input
Data Register
(P1_IN)
0x5210
(8 bits)
D7–0 P1IN[7:0] P1[7:0] port input data 1 1 (H) 0 0 (L) × R
P2 Port Input
Data Register
(P2_IN)
0x5220
(8 bits)
D7–0 P2IN[7:0] P2[7:0] port input data 1 1 (H) 0 0 (L) × R
P3 Port Input
Data Register
(P3_IN)
0x5230
(8 bits)
D7–4 –reserved – – – 0 when being read.
D3–0 P3IN[3:0] P3[3:0] port input data 1 1 (H) 0 0 (L) × R
Note: The “x” in the bit names indicates the port number (0 to 3).
D[7:0] PxIN[7:0]: Px[7:0] Port Input Data Bits (P3 port is P3IN[3:0])
Read out the P port pin status. (Default: external pin status)
1(R): High level
0(R): Low level
PxIN[7:0] correspond directly to the Px[7:0] pins and read the pin voltage level regardless of input/out-
put mode. 1 is read when the pin voltage is High; 0 is read when the voltage is Low.
Writing operations to the read-only PxIN[7:0] are disabled.
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0x5201/0x5211/0x5221/0x5231: Px Port Output Data Registers (Px_OUT)
Register name Address Bit Name Function Setting Init. R/W Remarks
P0 Port Output
Data Register
(P0_OUT)
0x5201
(8 bits)
D7–0 P0OUT[7:0] P0[7:0] port output data 1 1 (H) 0 0 (L) 0 R/W
P1 Port Output
Data Register
(P1_OUT)
0x5211
(8 bits)
D7–0 P1OUT[7:0] P1[7:0] port output data 1 1 (H) 0 0 (L) 0 R/W
P2 Port Output
Data Register
(P2_OUT)
0x5221
(8 bits)
D7–0 P2OUT[7:0] P2[7:0] port output data 1 1 (H) 0 0 (L) 0 R/W
P3 Port Output
Data Register
(P3_OUT)
0x5231
(8 bits)
D7–4 –reserved – – – 0 when being read.
D3–0 P3OUT[3:0] P3[3:0] port output data 1 1 (H) 0 0 (L) 0 R/W
Note: The “x” in the bit names indicates the port number (0 to 3).
D[7:0] PxOUT[7:0]: Px[7:0] Port Output Data Bits (P3 port is P3OUT[3:0])
Set the data to be output from the port pin.
1(R/W): High level
0(R/W): Low level (default)
PxOUT[7:0] correspond directly to the Px[7:0] pins and output data from the port pin as written. Setting
the data bit to 1 sets the port pin to High; setting it to 0 sets it to Low.
Port data can also be written in input mode.
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0x5202/0x5212/0x5222/0x5232: Px Port I/O Direction Control Registers (Px_IO)
Register name Address Bit Name Function Setting Init. R/W Remarks
P0 Port
I/O Direction
Control Register
(P0_IO)
0x5202
(8 bits)
D7–0 P0IO[7:0] P0[7:0] port I/O direction select 1 Output 0 Input 0 R/W
P1 Port
I/O Direction
Control Register
(P1_IO)
0x5212
(8 bits)
D7–0 P1IO[7:0] P1[7:0] port I/O direction select 1 Output 0 Input 0 R/W
P2 Port
I/O Direction
Control Register
(P2_IO)
0x5222
(8 bits)
D7–0 P2IO[7:0] P2[7:0] port I/O direction select 1 Output 0 Input 0 R/W
P3 Port
I/O Direction
Control Register
(P3_IO)
0x5232
(8 bits)
D7–4 –reserved – – – 0 when being read.
D3–0 P3IO[3:0] P3[3:0] port I/O direction select 1 Output 0 Input 0 R/W
Note: The “x” in the bit names indicates the port number (0 to 3).
D[7:0] PxIO[7:0]: Px[7:0] Port I/O Direction Select Bits (P3 port is P3IN[3:0])
Set the input/output mode for the input/output port.
1(R/W): Output mode
0(R/W): Input mode (default)
PxIO[7:0] are the input/output direction selection bits corresponding directly to the Px[7:0] ports. Set-
ting to 1 selects output mode, while setting to 0 selects input mode. The peripheral module function
determines the input/output direction for when a pin is used for peripheral modules.
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0x5203/0x5213/0x5223/0x5233: Px Port Pull-up Control Registers (Px_PU)
Register name Address Bit Name Function Setting Init. R/W Remarks
P0 Port Pull-up
Control Register
(P0_PU)
0x5203
(8 bits)
D7–0 P0PU[7:0] P0[7:0] port pull-up enable 1 Enable 0 Disable 1
(0xff)
R/W
P1 Port Pull-up
Control Register
(P1_PU)
0x5213
(8 bits)
D7–0 P1PU[7:0] P1[7:0] port pull-up enable 1 Enable 0 Disable 1
(0xff)
R/W
P2 Port Pull-up
Control Register
(P2_PU)
0x5223
(8 bits)
D7–0 P2PU[7:0] P2[7:0] port pull-up enable 1 Enable 0 Disable 1
(0xff)
R/W
P3 Port Pull-up
Control Register
(P3_PU)
0x5233
(8 bits)
D7–4 –reserved – – – 0 when being read.
D3–0 P3PU[3:0] P3[3:0] port pull-up enable 1 Enable 0 Disable 1
(0xff)
R/W
Note: The “x” in the bit names indicates the port number (0 to 3).
D[7:0] PxPU[7:0]: Px[7:0] Port Pull-up Enable Bits (P3 port is P3PU[3:0])
Enable or disable the pull-up resistor included in each port.
1 (R/W): Enabled (default)
0 (R/W): Disabled
PxPU[7:0] are the pull-up control bits that correspond directly to the Px[7:0] ports. Setting to 1 enables
the pull-up resistor and pulls up the port pin in input mode. It will not be pulled up if set to 0.
The PxPU[7:0] setting is disabled in output mode, and the pin is not pulled up.
Input/output ports that are not used should be set with pull-up enabled.
This pull-up setting is also enabled for ports for which the peripheral module function has been select-
ed.
A delay will occur in the waveform rise-up depending on time constants such as pull-up resistance and
pin load capacitance if the port pin is switched from Low level to High level by the internal pull-up re-
sistor. An appropriate wait time must be set for the input/output port loading. The wait time set should
be a value not less than that calculated from the following equation.
Wait time = RIN x (CIN + load capacitance on board) x 1.6 [s]
RIN: pull-up resistance maximum value
CIN: pin capacitance maximum value
10 INPUT/OUTPUT PORT (P)
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0x5205/5215: Px Port Interrupt Mask Registers (Px_IMSK)
Register name Address Bit Name Function Setting Init. R/W Remarks
P0 Port
Interrupt Mask
Register
(P0_IMSK)
0x5205
(8 bits)
D7–0 P0IE[7:0] P0[7:0] port interrupt enable 1 Enable 0 Disable 0 R/W
P1 Port
Interrupt Mask
Register
(P1_IMSK)
0x5215
(8 bits)
D7–0 P1IE[7:0] P1[7:0] port interrupt enable 1 Enable 0 Disable 0 R/W
Note: The “x” in the bit names indicates the port number (0 or 1).
D[7:0] PxIE[7:0]: Px[7:0] Port Interrupt Enable Bits
Permit or prohibit P0[7:0] and P1[7:0] port interrupt.
1 (R/W): Interrupt permitted
0 (R/W): Interrupt prohibited (default)
Setting PxIE[7:0] to 1 permits the corresponding interrupt, while setting to 0 blocks interrupts. Status
changes for the input pin with interrupt blocked do not affect interrupt occurrence.
To enable interrupt generation, the ITC P0 and P1 port interrupt enable bits must also be set to permit
interrupts.
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0x5206/5216: Px Port Interrupt Edge Select Registers (Px_EDGE)
Register name Address Bit Name Function Setting Init. R/W Remarks
P0 Port
Interrupt Edge
Select Register
(P0_EDGE)
0x5206
(8 bits)
D7–0
P0EDGE[7:0]
P0[7:0] port interrupt edge select 1 Falling edge 0 Rising edge 0 R/W
P1 Port
Interrupt Edge
Select Register
(P1_EDGE)
0x5216
(8 bits)
D7–0
P1EDGE[7:0]
P1[7:0] port interrupt edge select 1 Falling edge 0 Rising edge 0 R/W
Note: The “x” in the bit names indicates the port number (0 or 1).
D[7:0] PxEDGE[7:0]: Px[7:0] Port Interrupt Edge Select Bits
Select the input signal edge for generating P0[7:0] and P1[7:0] port interrupts.
1 (R/W): Falling edge
0 (R/W): Rising edge (default)
Port interrupts are generated at the input signal falling edge if PxEDGE[7:0] are set to 1 and at the ris-
ing edge if set to 0.
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0x5207/5217: Px Port Interrupt Flag Registers (Px_IFLG)
Register name Address Bit Name Function Setting Init. R/W Remarks
P0 Port
Interrupt Flag
Register
(P0_IFLG)
0x5207
(8 bits)
D7–0 P0IF[7:0] P0[7:0] port interrupt flag 1 Cause of
interrupt
occurred
0 Cause of
interrupt not
occurred
0 R/W Reset by writing 1.
P1 Port
Interrupt Flag
Register
(P1_IFLG)
0x5217
(8 bits)
D7–0 P1IF[7:0] P1[7:0] port interrupt flag 1 Cause of
interrupt
occurred
0 Cause of
interrupt not
occurred
0 R/W Reset by writing 1.
Note: The “x” in the bit names indicates the port number (0 or 1).
D[7:0] PxIF[7:0]: Px[7:0] Port Interrupt Flags
These are interrupt flags indicating the interrupt factor occurrence status.
1(R): Interrupt factor present
0(R): No interrupt factor (default)
1(W): Reset flag
0(W): Disabled
PxIF[7:0] are interrupt flags corresponding to the individual 16 ports of P0[7:0] and P1[7:0]. Setting
the corresponding PxIE[7:0] (Px_IMSK register) to 1 sets PxIF[7:0] to 1 at the specified edge (rising or
falling edge) of the input signal. A P0 or P1 port interrupt request signal is also output to the ITC at the
same time. This interrupt request signal causes the P0/P1 port interrupt flag inside the ITC to be set to 1.
Meeting the ITC and S1C17 core interrupt conditions generates an interrupt.
The following processing is needed to manage the interrupt factor occurrence state using the PxIF[7:0].
1. Set the ITC P0 and P1 interrupt trigger mode to level trigger mode.
2. Reset the P port module interrupt flag PxIF[7:0] within the interrupt processing routine after the
interrupt occurs (this also resets the ITC interrupt flag).
PxIF[7:0] is reset by writing as 1.
Note: To prevent genarating unnecessary interrupts, reset the relevant PxIF[7:0] before
permitting interrupts for the required port using PxIE[7:0] (Px_IMSK register).
* P0IE[7:0]: P0[7:0] Port Interrupt Enable Bits in the P0 Port Interrupt Mask (P0_IMSK) Register
(D[7:0]/0x5205)
* P1IE[7:0]: P1[7:0] Port Interrupt Enable Bits in the P1 Port Interrupt Mask (P1_IMSK) Register
(D[7:0]/0x5215)
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0x5208: P0 Port Chattering Filter Control Register (P0_CHAT)
Register name Address Bit Name Function Setting Init. R/W Remarks
P0 Port
Chattering
Filter Control
Register
(P0_CHAT)
0x5208
(8 bits)
D7 –reserved – – – 0 when being read.
D6–4 P0CF2[2:0] P0[7:4] chattering filter time P0CF2[2:0] Filter time 0 R/W
0x7
0x6
0x5
0x4
0x3
0x2
0x1
0x0
16384/fPCLK
8192/fPCLK
4096/fPCLK
2048/fPCLK
1024/fPCLK
512/fPCLK
256/fPCLK
None
0x0 R/W
D3 –reserved – – – 0 when being read.
D2–0 P0CF1[2:0] P0[3:0] chattering filter time P0CF1[2:0] Filter time 0x0 R/W
0x7
0x6
0x5
0x4
0x3
0x2
0x1
0x0
16384/fPCLK
8192/fPCLK
4096/fPCLK
2048/fPCLK
1024/fPCLK
512/fPCLK
256/fPCLK
None
D7 Reserved
D[6:4] P0CF2[2:0]: P0[7:4] Chattering Filter Time Select Bits
Set the chattering filter circuit included in the P0[7:4] ports.
D3 Reserved
D[2:0] P0CF1[2:0]: P0[3:0] Chattering Filter Time Select Bits
Set the chattering filter circuit included in the P0[3:0] ports.
The P0 port includes a chattering filter circuit for key entry, which you can select to use or not use (and
for which you can select a verification time if used) individually for the four P0[3:0] and P0[7:4] ports
using P0CFx[2:0].
Table 10.8.2: Chattering filter function settings
P0CFx[2:0] Verification time *
0x7 16384/fPCLK (8ms)
0x6 8192/fPCLK (4ms)
0x5 4096/fPCLK (2ms)
0x4 2048/fPCLK (1ms)
0x3 1024/fPCLK (512µs)
0x2 512/fPCLK (256µs)
0x1 256/fPCLK (128µs)
0x0 No verification time (Off)
(Default: 0x0, *when OSC3 = 2 MHz and PCLK = OSC3)
Note: • The chattering filter verification time refers to the maximum pulse width that can be filtered.
Generating an input interrupt requires a minimum input time of the verification time and a
maximum input time of twice the verification time.
• Input interrupts will not be accepted for a transition into SLEEP mode with the chattering
filter left on. The chattering filter should be set off (no verification time) before executing the
slp command.
• P0 port interrupts must be blocked when P0_CHAT register settings are being changed.
Changing the setting while interrupts are permitted may generate inadvertent P0 interrupts.
• A phenomenon may occur in which the internal signal oscillates due to the time elapsed un-
til the signal reaches the threshold value if the input signal rise-up/drop-off time is delayed.
Since input interrupts will malfunction under these conditions, the input signal rise-up/drop-
off time should normally be set to 25 ns or less.
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0x5209: P0 Port Key-Entry Reset Configuration Register (P0_KRST)
Register name Address Bit Name Function Setting Init. R/W Remarks
P0 Port Key-
Entry Reset
Configuration
Register
(P0_KRST)
0x5209
(8 bits)
D7–2 –reserved – – – 0 when being read.
D1–0
P0KRST[1:0]
P0 port key-entry reset
configuration
P0KRST[1:0] Configuration 0x0 R/W
0x3
0x2
0x1
0x0
P0[3:0] = 0
P0[2:0] = 0
P0[1:0] = 0
Disable
D[7:2] Reserved
D[1:0] P0KRST[1:0]: P0 Port Key-Entry Reset Configuration Bits
Select the port combination used for P0 port key entry resetting.
Table 10.8.3: P0 port key entry input reset settings
P0KRST[1:0] Ports used
0x3 P00, P01, P02, P03
0x2 P00, P01, P02
0x1 P00, P01
0x0 Not used
(Default: 0x0)
The key entry reset function performs an initial reset by inputting Low level simultaneously from exter-
nally to the port selected here.
For example, if P0KRST[1:0] is set to 0x3, an initial reset is performed when the four ports P00 to P03
are simultaneously set to Low level.
Set P0KRST[1:0] to 0x0 when this reset function is not used.
Note: • Make sure the specified ports are not simultaneously switched to Low during normal opera-
tions when using the P0 port key-entry reset function.
• The P0 port key entry reset function is disabled on initial resetting and cannot be used for
resetting at power-on.
• The P0 port key-entry reset function cannot be used in SLEEP state.
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0x52a0: P0 Port Function Select Register (P0_PMUX)
Register name Address Bit Name Function Setting Init. R/W Remarks
P0 Port
Function Select
Register
(P0_PMUX)
0x52a0
(8 bits)
D7–6 –reserved – – – 0 when being read.
D5 P05MUX P05 port function select 1 REMO 0 P05 0 R/W
D4 P04MUX P04 port function select 1 REMI 0 P04 0 R/W
D3–0 –reserved – – – 0 when being read.
The P04 and P05 input/output port pins are shared with the peripheral module pins. This register is used to select
how the pins are used.
D[7:6] Reserved
D5 P05MUX: P05 Port Function Select Bit
1 (R/W): REMO (REMC)
0 (R/W): P05 port (default)
D4 P04MUX: P04 Port Function Select Bit
1 (R/W): REMI (R EMC)
0 (R/W): P04 port (default)
D[3:0] Reserved
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0x52a1: P1 Port Function Select Register (P1_PMUX)
Register name Address Bit Name Function Setting Init. R/W Remarks
P1 Port
Function Select
Register
(P1_PMUX)
0x52a1
(8 bits)
D7 P17MUX P17 port function select 1 #SPISS 0 P17 0 R/W
D6 –reserved – – – 0 when being read.
D5 P15MUX P15 port function select 1 SCL 0 P15 0 R/W
D4 P14MUX P14 port function select 1 SDA 0 P14 0 R/W
D3 P13MUX P13 port function select 1 FOUT1 0 P13 0 R/W
D2–0 –reserved – – – 0 when being read.
The P13 to P15 and P17 input/output port pins are shared with the peripheral module pins. This register is used to
select how the pins are used.
D7 P17MUX: P17 Port Function Select Bit
1 (R/W): #SPISS (SPI)
0 (R/W): P17 port (default)
D6 Reserved
D5 P15MUX: P15 Port Function Select Bit
1 (R/W): SCL (I2C)
0 (R/W): P15 port (default)
D4 P14MUX: P14 Port Function Select Bit
1 (R/W): SDA (I2C)
0 (R/W): P14 port (default)
D3 P13MUX: P13 Port Function Select Bit
1 (R/W): FOUT1 (OSC)
0 (R/W): P13 port (default)
D[2:0] Reserved
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0x52a2: P2 Port Function Select Register (P2_PMUX)
Register name Address Bit Name Function Setting Init. R/W Remarks
P2 Port
Function Select
Register
(P2_PMUX)
0x52a2
(8 bits)
D7 P27MUX P27 port function select 1 EXCL3 0 P27 0 R/W
D6 P26MUX P26 port function select 1 TOUT 0 P26 0 R/W
D5 P25MUX P25 port function select 1 SCLK 0 P25 0 R/W
D4 P24MUX P24 port function select 1 SOUT 0 P24 0 R/W
D3 P23MUX P23 port function select 1 SIN 0 P23 0 R/W
D2 P22MUX P22 port function select 1 SPICLK 0 P22 0 R/W
D1 P21MUX P21 port function select 1 SDO 0 P21 0 R/W
D0 P20MUX P20 port function select 1 SDI 0 P20 0 R/W
The P20 to P27 input/output port pins are shared with the peripheral module pins. This register is used to select
how the pins are used.
D7 P27MUX: P27 Port Function Select Bit
1 (R/W): EXCL3 (T16E)
0 (R/W): P27 port (default)
D6 P26MUX: P26 Port Function Select Bit
1 (R/W): TOUT (T16E)
0 (R/W): P26 port (default)
D5 P25MUX: P25 Port Function Select Bit
1 (R/W): SCLK (UART)
0 (R/W): P25 port (default)
D4 P24MUX: P24 Port Function Select Bit
1 (R/W): SOUT (UART)
0 (R/W): P24 port (default)
D3 P23MUX: P23 Port Function Select Bit
1 (R/W): SIN (UART)
0 (R/W): P23 port (default)
D2 P22MUX: P22 Port Function Select Bit
1 (R/W): SPICLK (SPI)
0 (R/W): P22 port (default)
D1 P21MUX: P21 Port Function Select Bit
1 (R/W): SDO (SPI)
0 (R/W): P21 port (default)
D0 P20MUX: P20 Port Function Select Bit
1 (R/W): SDI (SPI)
0 (R/W): P20 port (default)
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0x52a3: P3 Port Function Select Register (P3_PMUX)
Register name Address Bit Name Function Setting Init. R/W Remarks
P3 Port
Function Select
Register
(P3_PMUX)
0x52a3
(8 bits)
D7–4 –reserved – – – 0 when being read.
D3 P33MUX P33 port function select 1 P33 0 DSIO 0 R/W
D2 P32MUX P32 port function select 1 P32 0 DST2 0 R/W
D1 P31MUX P31 port function select 1 P31 0 DCLK 0 R/W
D0 P30MUX P30 port function select 1 FOUT3 0 P30 0 R/W
The P30 to P33 input/output port pins are shared with the peripheral module pins. This register is used to select
how the pins are used.
D[7:4] Reserved
D3 P33MUX: P33 Port Function Select Bit
1 (R/W): P33 port
0 (R/W): DSIO (DBG) (default)
D2 P32MUX: P32 Port Function Select Bit
1 (R/W): P32 port
0 (R/W): DST2 (DBG) (default)
D1 P31MUX: P31 Port Function Select Bit
1 (R/W): P31 port
0 (R/W): DCLK (DBG) (default)
D0 P30MUX: P30 Port Function Select Bit
1 (R/W): FOUT3 (OSC)
0 (R/W): P30 port (default)
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10.9 Precautions
Operation clock
• The PCLK clock must be fed from the clock generator to access the input/output port.
The prescaler output clock is also needed to operate the P0 port chattering filter. Switch on the prescaler
when using this function.
Pull-up
• A delay will occur in the waveform rise-up depending on time constants such as pull-up resistance and pin
load capacitance if the port pin is switched from Low level to High level by the internal pull-up resistor. An
appropriate wait time must be set for the input/output port loading. The wait time set should be a value not
less than that calculated from the following equation.
Wait time = RIN x (CIN + load capacitance on board) x 1.6 [s]
RIN: pull-up resistance maximum value
CIN: pin capacitance maximum value
• Input/output ports that are not used should be set with pull-up resistance enabled.
P0 and P1 port interrupts
• To prevent generating unnecessary interrupts, reset the corresponding interrupt flag—P0IF[7:0] (0x5207) or
P1IF[7:0] (0x5217)—before permitting interrupts for the required port with the P0_IMSK register (0x5205)
or P1_IMSK register (0x5215).
• Set the ITC P0 and P1 port interrupt trigger mode to level trigger mode.
Reset the P port module interrupt flag P0IF[7:0] (0x5207) and P1IF[7:0] (0x5217) within the interrupt pro-
cessing routine after the interrupt occurs. This also resets the ITC interrupt flag.
P0 Port chattering filter circuit
• Input interrupts will not be accepted for a transition into SLEEP mode with the chattering filter left on. The
chattering filter should be set off (no verification time) before executing the slp command.
• P0 port interrupts must be blocked when P0_CHAT register (0x5208) settings are being changed. Changing
the setting while interrupts are permitted may generate inadvertent P0 interrupts.
• The chattering filter verification time refers to the maximum pulse width that can be filtered. Generating an
input interrupt requires a minimum input time of the verification time and a maximum input time of twice the
verification time.
• A phenomenon may occur in which the internal signal oscillates due to the time elapsed until the signal
reaches the threshold value if the input signal rise-up/drop-off time is delayed. Since input interrupts will
malfunction under these conditions, the input signal rise-up/drop-off time should normally be set to 25 ns or
less.
P0 port key-entry reset
• Make sure the specified ports are not simultaneously switched to Low during normal operations when using
the P0 port key-entry reset function.
• The P0 port key entry reset function is disabled on initial resetting and cannot be used for resetting at power-
on.
• The P0 port key-entry reset function cannot be used in SLEEP state.
11 16-BIT TIMER (T16)
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11 16-bit Timer (T16)
11.1 16-bit Timer Overview
The S1C17001 incorporates a 3-channel 16-bit timer (T16).
The 16-bit timer consists of a 16-bit presettable down counter and a 16-bit reload data register holding the preset
values. The timer counts down from the initial value set in the reload data register and outputs an underflow signal
when the counter underflows. The underflow signal is used to generate an interrupt and an internal serial interface
clock. The underflow cycle can be programmed by selecting the prescaler clock and reload data, enabling the appli-
cation program to obtain time intervals and serial transfer speeds as required.
The timer also combines an event counter function via the input/output port pins and the external input signal pulse
width measurement function.
Figure 11.1.1 illustrates the 16-bit timer configuration.
Reload data register
T16_TRx
PRUN
DF[3:0]
PCLK-1/1 to 1/16 K
Underflow
RUN/STOP control
Internal data bus
Count clock selection
Interrupt request
Serial transfer clock
To ITC
To SPI (from Ch.1)
To I2C (from Ch.2)
P16 (Ch.0)
P07 (Ch.1)
P06 (Ch.2)
PRESER Timer reset
Down counter
T16_TCx
Control
circuit
External input signal
polarity selection CKACTV
Operating mode
selection CKSL[1:0]
Count mode selection TRMD
Prescaler
16-bit timer Ch.x
Figure 11.1.1: 16-bit timer configuration (1-channel)
Note: The 3-channel 16-bit timer module has the same functions except for the control register ad-
dress. The description in this section applies to all channels of the 16-bit timer. The “x” in the
register name refers to the channel number (0 to 2). The register addresses are referenced as
“Ch.0,” “Ch.1,” and “Ch.2.”
Example: T16_CTLx register (0x4226/0x4246/0x4266)
Ch.0: T16_CTL0 register (0x4226)
Ch.1: T16_CTL1 register (0x4246)
Ch.2: T16_CTL2 register (0x4266)
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11.2 16-bit Timer Operating Modes
The 16-bit timer has the following three operating modes:
1. Internal clock mode (Normal timer counting internal clock)
2. External clock mode (Functions as event counter)
3. Pulse width measurement mode (Counts external input pulse width using internal clock)
The operating mode is selected using CKSL[1:0] (D[9:8]/T16_CTLx register).
* CKSL[1:0]: Input Clock and Pulse Width Count Mode Select Bits in the 16-bit Timer Ch.x Control (T16_
CTLx) Register (D[9:8]/0x4226/0x4246/0x4266)
Table 11.2.1: Operating mode selection
CKSL[1:0] Operating mode
0x3 Reserved
0x2 Pulse width measurement mode
0x1 External clock mode
0x0 Internal clock mode
(Default: 0x0)
11.2.1 Internal Clock Mode
Internal clock mode uses the prescaler output clock as the count clock.
The timer counts down from the initial value set in the reload data register and outputs an underflow signal when
the counter underflows. The underflow signal is used to generate an interrupt and an internal serial interface clock.
The time until underflow occurs can be finely programmed by selecting the prescaler clock and initial counter
value, making it useful for serial transfer clock generation and sporadic time measurement.
Count clock selection
The count clock is selected by the DF[3:0] (D[3:0]/T16_CLKx register) from the 15 types generated by the pr-
escaler dividing the PCLK clock into 1/1 to 1/16 K divisions.
* DF[3:0]: Timer Input Clock Select Bits in the 16-bit Timer Ch.x Input Clock Select (T16_CLKx) Register
(D[3:0]/0x4220/0x4240/0x4260)
Table 11.2.1.1: Count clock selection
DF[3:0] Prescaler output clock DF[3:0] Prescaler output clock
0xf Reserved 0x7 PCLK-1/128
0xe PCLK-1/16384 0x6 PCLK-1/64
0xd PCLK-1/8192 0x5 PCLK-1/32
0xc PCLK-1/4096 0x4 PCLK-1/16
0xb PCLK-1/2048 0x3 PCLK-1/8
0xa PCLK-1/1024 0x2 PCLK-1/4
0x9 PCLK-1/512 0x1 PCLK-1/2
0x8 PCLK-1/256 0x0 PCLK-1/1
(Default: 0x0)
Note: • The prescaler must run before operating the 16-bit timer in internal clock mode.
• Make sure the 16-bit timer count is halted before changing count clock settings.
For detailed information on the prescaler control, see “9 Prescaler (PSC).”
11 16-BIT TIMER (T16)
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11.2.2 External Clock Mode
External clock mode uses the clock and pulses input via the input/output port as a count clock. These inputs can
also be used as an event counter. Timer operations other than the input clock are the same as for internal clock
mode.
External clock input port
The following input ports are used for external clock or pulse input.
Table 11.2.2.1: External clock input port
Timer channel Input signal name Input/output port pin
Ch.0 EXCL0 P16
Ch.1 EXCL1 P07
Ch.2 EXCL2 P06
Confirm that the input/output ports used for external clock or pulse input are set to input mode (the default set-
ting). No pin function selection is needed. While the input/output ports function as general purpose inputs, the
input signal is also sent to the 16-bit timer.
The P07 and P06 ports used by 16-bit timer Ch.1 and Ch.2 incorporate chattering filter circuits and can also be
used as EXCLx inputs. For instructions on controlling chattering filter circuits, see “10.6 P0 Port Chattering
Filter Function.”
Signal polarity selection
CKACTV (D10/T16_CTLx register) is used in this mode to select the falling edge or rising edge of the input
signal for counting.
* CKACTV: External Clock Active Level Select Bit in the 16-bit Timer Ch.x Control (T16_CTLx) Register
(D10/0x4226/0x4246/0x4266)
Counting down uses the rising edge when CKACTV is 1 (default) and uses the falling edge when set to 0.
External input clock
PRUN
Counter (CKACTV = 1)
Counter (CKACTV = 0)
n-1 n-2 n-3 n-4 n-5 n-6 n-7 n-8 n-9 n-10n
n-1 n-2 n-3 n-4 n-5 n-6 n-7 n-8 n-9 n-10n
Figure 11.2.2.1: External clock mode count
The 16-bit timer does not use the prescaler in this mode. If no other peripheral modules use the prescaler clock, the
prescaler can be stopped to reduce current consumption. (The prescaler clock is used for P0 port chattering filter-
ing.)
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11.2.3 Pulse Width Measurement Mode
In pulse width measurement mode, when pulses with the specified polarity are input from the external clock port,
the internal clock is fed only while the signal is active, enabling counting. This enables interrupt generation and in-
put pulse width measurements for pulse inputs of the specified width or greater.
Pulse input port
The Input/output port used for external pulse input is the same as for external clock mode (see Table 11.2.2.1).
Input pulses using the input/output port corresponding to the timer channel in input mode.
Count clock selection
Counting uses the prescaler output clock selected by DF[3:0] (D[3:0]/T16_CLKx register) in the same way as
for internal clock mode. Select the clock to suit approximate input pulse widths and counting accuracy.
Signal polarity selection
CKACTV (D10/T16_CTLx register) is used to select the active level for the pulses counted. The High period is
measured when CKACTV is 1 (default) and the Low period is measured when CKACTV is set to 0.
Internal count clock
PRUN
External input signal
Counter (CKACTV = 1) n-1 n-2 n-3 0x2 0x1 0x0 nn
Internal count clock
PRUN
External input signal
Counter (CKACTV = 1)
Underflow interrupt
0xff 0xfe 0xfd n+3 n+2 n+1 n0x0
Example 1: Pulse width measurement
Example 2: Detecting pulses over specified width
Figure 11.2.3.1: Pulse width measurement mode count operation
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11.3 Count Mode
The 16-bit timer features two count modes: Repeat mode and One-shot mode. These modes are selected using the
TRMD (D4/T16_CTLx register).
* TRMD: Count Mode Select Bit in the 16-bit Timer Ch.x Control (T16_CTLx) Register
(D4/0x4226/0x4246/0x4266)
Repeat mode (TRMD = 0, default)
Setting TRMD to 0 sets the 16-bit timer to Repeat mode.
In this mode, once the count starts, the 16-bit timer continues running until stopped by the application program.
If the counter underflows, the timer presets the reload data register value into the counter and continues the
count. Thus, the timer periodically outputs an underflow pulse. The 16-bit timer should be set to this mode to
generate periodic interrupts at desired intervals or to generate a serial transfer clock.
One-shot mode (TRMD = 1)
Setting TRMD to 1 sets the 16-bit timer to One-shot mode.
In this mode, the 16-bit timer stops automatically as soon as the counter underflows. This means only one inter-
rupt can be generated after the timer starts. Note that the timer presets the reload data register value to the coun-
ter, then stops after an underflow has occurred. The 16-bit timer should be set to this mode to set a specific wait
time or for pulse width measurement.
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11.4 16-bit Timer Reload Register and Underflow Cycle
The reload data register T16_TRx (0x4222/0x4242/0x4262) is used to set the initial value for the down counter.
The initial counter value set in the reload data register is preset to the down counter if the 16-bit timer is reset or the
counter underflows. If the 16-bit timer is started after resetting, the timer counts down from the reload value (initial
value). This means this reload value and the input clock frequency. determines the time elapsed from the point at
which the timer starts until the underflow occurs (or between underflows). The time determined is used to obtain
the specified wait time, the intervals between periodic interrupts, and the programmable serial interface transfer
clock.
One-shot mode
Counter
Repeat mode
Counter
01n-1n n
Preset by timer reset
Preset by timer reset
Auto preset
Underflow
Auto preset
(n = reload data)
01n-1n n
Underflow
Timer start
Timer start
Auto preset
01n-1 n
Underflow
Figure 11.4.1: Preset timing
The underflow cycle can be calculated as follows:
TR + 1 clk_in
Underflow interval = ——— [s] Underflow cycle = ——— [Hz]
clk_in TR + 1
clk_in: Count clock (prescaler output clock) frequency [Hz]
TR: Reload data (0 to 65535)
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11.5 16-bit Timer Reset
The 16-bit timer is reset by writing 1 to PRESER (D1/T16_CTLx register). The reload data is preset and the
counter is initialized.
* PRESER: Timer Reset Bit in the 16-bit Timer Ch.x Control (T16_CTLx) Register (D1/0x4226/0x4246/0x4266)
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11.6 16-bit Timer RUN/STOP Control
Make the following settings before starting the 16-bit timer.
(1) Select the operating mode (Internal clock, External clock, or Pulse width measurement). See Section 11.2.
(2) For Internal clock or Pulse width measurement mode, select the count clock (prescaler output clock). See Sec-
tion 11.2.1.
(3) Set the count mode (One-shot or Repeat). See Section 11.3.
(4) Calculate the initial counter value and set the reload data register. See Section 11.4.
(5) Reset the timer and preset the counter to the initial value. See Section 11.5.
(6) If using timer interrupts, set the interrupt level and allow interrupts for the relevant timer channel. See Section
11.8.
To start the 16-bit timer, write 1 to PRUN (D0/T16_CTLx register).
* PRUN: Timer Run/Stop Control Bit in the 16-bit Timer Ch.x Control (T16_CTLx) Register
(D0/0x4226/0x4246/0x4266)
The timer starts counting down from the initial value or from the current counter value if no initial value was pre-
set. When the counter underflows, the timer outputs an underflow pulse and presets the counter to the initial value.
An interrupt request is sent simultaneously to the interrupt controller (ITC).
If One-shot mode is set, the timer stops the count.
If Repeat mode is set, the timer continues to count from the reloaded initial value.
Write 0 to PRUN to stop the 16-bit timer via the application program. The counter stops counting and retains the
current counter value until either the timer is reset or restarted. To restart the count from the initial value, the timer
should be reset before writing 1 to PRUN.
Count clock
PRESER writing
PRUN
Counter
Interrupt request
01n-1n n
Count clock
PRESER writing
PRUN
Counter
Interrupt request
01n-1n n 01n-1 n n-1
One-shot mode
Repeat mode
Reset by hardwareSet by software
Set by software Reset by software
Figure 11.6.1: Count operation
In Pulse width measurement mode, the timer counts only while PRUN is set to 1 and the external input signal is at
the specified active level. When the external input signal becomes inactive, the 16-bit timer stops counting and re-
tains the counter value until the next active level input. (See Figure 11.2.3.1.)
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11.7 16-bit Timer Output Signal
The 16-bit timer outputs underflow pulses when the counter underflows.
These pulses are used for timer interrupt requests.
These pulses are also used to generate the internal serial interface serial transfer clock.
Underflow signal
Timer output
(serial transfer clock)
Interrupt request to ITC
Figure 11.7.1: Timer output clock
The clock generated is sent to the internal serial interface, as shown below.
16-bit timer Ch.1 output clock → SPI
16-bit timer Ch.2 output clock → I2C
Use the following equations to calculate the reload data register value for obtaining the desired transfer rate:
clk_in
SPI TR = ———— - 1
bps × 2
clk_in
I2C TR = ———— - 1
bps × 4
clk_in: Count clock (prescaler output clock) frequency [Hz]
TR: Reload data (0 to 65535)
bps: Transfer rate (bit/s)
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11.8 16-bit Timer Interrupts
The 16-bit timer outputs interrupt requests to the interrupt controller (ITC) when the counter underflows.
To generate a timer underflow interrupt, the interrupt level and interrupt permission should be set using the ITC
registers.
Timer interrupt ITC registers
Table 11.8.1 lists the ITC control registers for each timer channel.
Table 11.8.1: ITC registers
Timer channel Interrupt flag Interrupt enable bit Interrupt level setting bit
Ch.0 IIFT1 (D9/ITC_IFLG) IIEN1 (D9/ITC_EN) IILV1[2:0] (D[10:8]/ITC_ILV0)
Ch.1 IIFT2 (D10/ITC_IFLG) IIEN2 (D10/ITC_EN) IILV2[2:0] (D[2:0]/ITC_ILV1)
Ch.2 IIFT3 (D11/ITC_IFLG) IIEN3 (D11/ITC_EN) IILV3[2:0] (D[10:8]/ITC_ILV1)
ITC_IFLG register (0x4300)
ITC_EN register (0x4302)
ITC_ILV0 register (0x430e)
ITC_ILV1 register (0x4310)
If an underflow occurs in the timer, the corresponding interrupt flag is set to 1.
If the interrupt enable bit corresponding to that interrupt flag is set to 1, the ITC sends an interrupt request to
the S1C17 core. To prohibit timer interrupts, set the interrupt enable bit to 0 beforehand. The interrupt flag will
be set to 1 by the timer underflow pulse regardless of the interrupt enable bit setting (i.e., even if set to 0).
The interrupt level setting bit sets the timer interrupt level (0 to 7). If set to the same interrupt level, the 16-bit
timer Ch.0 takes the highest priority, while the 16-bit timer Ch.2 takes the lowest priority.
The S1C17 core accepts interrupts when all of the following conditions are satisfied:
• The interrupt enable bit has been set to 1.
• The PSR (S1C17 core internal processor status register) IE (interrupt enable) bit has been set to 1.
• The timer interrupt has a higher interrupt level set than that set for the PSR IL (interrupt level).
• No other interrupt factors having higher precedence (e.g., NMI) are present.
For more information on these interrupt control registers and operations when interrupts occur, see “6 Interrupt
Controller (ITC).”
Interrupt vectors
The timer interrupt vector numbers and vector addresses are listed below.
Table 11.8.2: Timer interrupt vectors
Timer channel Vector number Vector address
Timer Ch.0 13 (0x0d) 0x8034
Timer Ch.1 14 (0x0e) 0x8038
Timer Ch.2 15 (0x0f) 0x803c
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11.9 Control Register Details
Table 11.9.1: 16-bit timer register list
Address Register name Function
0x4220 T16_CLK0 16-bit Timer Ch.0 Input Clock Select Register Prescaler output clock selection
0x4222 T16_TR0 16-bit Timer Ch.0 Reload Data Register Reload data setting
0x4224 T16_TC0 16-bit Timer Ch.0 Counter Data Register Counter data
0x4226 T16_CTL0 16-bit Timer Ch.0 Control Register Timer mode setting and timer RUN/STOP
0x4240 T16_CLK1 16-bit Timer Ch.1 Input Clock Select Register Prescaler output clock selection
0x4242 T16_TR1 16-bit Timer Ch.1 Reload Data Register Reload data setting
0x4244 T16_TC1 16-bit Timer Ch.1 Counter Data Register Counter data
0x4246 T16_CTL1 16-bit Timer Ch.1 Control Register Timer mode setting and timer RUN/STOP
0x4260 T16_CLK2 16-bit Timer Ch.2 Input Clock Select Register Prescaler output clock selection
0x4262 T16_TR2 16-bit Timer Ch.2 Reload Data Register Reload data setting
0x4264 T16_TC2 16-bit Timer Ch.2 Counter Data Register Counter data
0x4266 T16_CTL2 16-bit Timer Ch.2 Control Register Timer mode setting and timer RUN/STOP
The 16-bit timer registers are described in detail below. These are 16-bit registers.
Note: When data is written to the registers, the “Reserved” bits must always be written as 0 and not 1.
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0x4220/0x4240/0x4260: 16-bit Timer Ch.x Input Clock Select Registers (T16_CLKx)
Register name Address Bit Name Function Setting Init. R/W Remarks
16-bit Timer
Ch.x Input
Clock Select
Register
(T16_CLKx)
0x4220
0x4240
0x4260
(16 bits)
D15–4 –reserved – – – 0 when being read.
D3–0 DF[3:0] Timer input clock select
(Prescaler output clock)
DF[3:0] Clock 0x0 R/W
0xf
0xe
0xd
0xc
0xb
0xa
0x9
0x8
0x7
0x6
0x5
0x4
0x3
0x2
0x1
0x0
reserved
PCLK-1/16384
PCLK-1/8192
PCLK-1/4096
PCLK-1/2048
PCLK-1/1024
PCLK-1/512
PCLK-1/256
PCLK-1/128
PCLK-1/64
PCLK-1/32
PCLK-1/16
PCLK-1/8
PCLK-1/4
PCLK-1/2
PCLK-1/1
Note: The “x” in the register names indicates the channel number (0 to 2).
D[15:4] Reserved
D[3:0] DF[3:0]: Timer Input Clock Select Bits
Select the 16-bit timer count clock from the 15 different prescaler output clocks.
Table 11.9.2: Count clock selection
DF[3:0] Prescaler output clock DF[3:0] Prescaler output clock
0xf Reserved 0x7 PCLK-1/128
0xe PCLK-1/16384 0x6 PCLK-1/64
0xd PCLK-1/8192 0x5 PCLK-1/32
0xc PCLK-1/4096 0x4 PCLK-1/16
0xb PCLK-1/2048 0x3 PCLK-1/8
0xa PCLK-1/1024 0x2 PCLK-1/4
0x9 PCLK-1/512 0x1 PCLK-1/2
0x8 PCLK-1/256 0x0 PCLK-1/1
(Default: 0x0)
Note: Make sure the 16-bit timer count is halted before changing count clock settings.
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0x4222/0x4242/0x4262: 16-bit Timer Ch.x Reload Data Registers (T16_TRx)
Register name Address Bit Name Function Setting Init. R/W Remarks
16-bit Timer
Ch.x Reload
Data Register
(T16_TRx)
0x4222
0x4242
0x4262
(16 bits)
D15–0 TR[15:0] 16-bit timer reload data
TR15 = MSB
TR0 = LSB
0x0 to 0xffff 0x0 R/W
Note: The “x” in the register names indicates the channel number (0 to 2).
0x4222: 16-bit Timer Ch.0 Reload Data Register (T16_TR0)
0x4242: 16-bit Timer Ch.1 Reload Data Register (T16_TR1)
0x4262: 16-bit Timer Ch.2 Reload Data Register (T16_TR2)
D[15:0] TR[15:0]: 16-bit Timer Reload Data
Sets the counter initial value. (Default: 0x0)
The reload data set in this register is preset to the counter if the timer is reset or the counter underflows.
If the 16-bit timer is started after resetting, the timer counts down from the reload value (initial value).
This means this reload value and the input clock frequency determine the time elapsed from the point at
which the timer starts until the underflow occurs (or between underflows). The time determined is used
to obtain the desired wait time, the intervals between periodic interrupts, and the programmable serial
interface transfer clock.
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0x4224/0x4244/0x4264: 16-bit Timer Ch.x Counter Data Registers (T16_TCx)
Register name Address Bit Name Function Setting Init. R/W Remarks
16-bit Timer
Ch.x Counter
Data Register
(T16_TCx)
0x4224
0x4244
0x4264
(16 bits)
D15–0 TC[15:0] 16-bit timer counter data
TC15 = MSB
TC0 = LSB
0x0 to 0xffff 0x0 R
Note: The “x” in the register names indicates the channel number (0 to 2).
0x4224: 16-bit Timer Ch.0 Counter Data Register (T16_TC0)
0x4244: 16-bit Timer Ch.1 Counter Data Register (T16_TC1)
0x4264: 16-bit Timer Ch.2 Counter Data Register (T16_TC2)
D[15:0] TC[15:0]: 16-bit Timer Counter Data
Reads out the counter data. (Default: 0x0)
This register is read-only and cannot be written to.
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0x4226/0x4246/0x4266: 16-bit Timer Ch.x Control Registers (T16_CTLx)
Register name Address Bit Name Function Setting Init. R/W Remarks
16-bit Timer
Ch.x Control
Register
(T16_CTLx)
0x4226
0x4246
0x4266
(16 bits)
D15–11 –reserved – – – 0 when being read.
D10 CKACTV External clock active level select 1 High 0 Low 1 R/W
D9–8 CKSL[1:0] Input clock and pulse width
measurement mode select
CKSL[1:0] Mode 0x0 R/W
0x3
0x2
0x1
0x0
reserved
Pulse width
External clock
Internal clock
D7–5 –reserved – – – 0 when being read.
D4 TRMD Count mode select 1 One shot 0 Repeat 0 R/W
D3–2 –reserved – – – 0 when being read.
D1 PRESER Timer reset 1 Reset 0 Ignored 0 W
D0 PRUN Timer run/stop control 1 Run 0 Stop 0 R/W
Note: The “x” in the register names indicates the channel number (0 to 2).
0x4226: 16-bit Timer Ch.0 Control Register (T16_CTL0)
0x4246: 16-bit Timer Ch.1 Control Register (T16_CTL1)
0x4266: 16-bit Timer Ch.2 Control Register (T16_CTL2)
D[15:11] Reserved
D10 CKACTV: External Clock Active Level Select Bit
Selects the external input pulse polarity or external clock counting edge.
1 (R/W): Active High/Rising edge (default)
0 (R/W): Active Low/Falling edge
This setting determines whether the external input clock rising edge or falling edge is used for counting
in external clock mode (when CKSL[1:0] = 0x1). In pulse width measurement mode (when CKSL[1:0]
= 0x2), this setting determines external input pulse polarity.
D[9:8] CKSL[1:0]: Input Clock and Pulse Width Measurement Mode Select Bits
Select the 16-bit timer operating mode.
Table 11.9.3: Operating mode selection
CKSL[1:0] Operating mode
0x3 Reserved
0x2 Pulse width measurement mode
0x1 External clock mode
0x0 Internal clock mode
(Default: 0x0)
Internal clock mode uses the prescaler output clock as the count clock. The timer counts down from
the initial value set in the reload data register and outputs an underflow signal when the counter under-
flows. The underflow signal is used to generate an interrupt and an internal serial interface clock. The
time until underflow occurs can be finely programmed by selecting the prescaler clock and initial coun-
ter value, allowing its use for serial transfer clock generation and sporadic time measurement.
External clock mode uses the clock and pulses input via the input/output ports (Ch.0: P16, Ch.1: P07,
Ch.2: P06) as a count clock and can also be used as an event counter. Timer operations other than the
input clock are the same as for internal clock mode.
In pulse width measurement mode, when pulses with the specified polarity are input from the external
clock port, the internal clock is fed only while the signal is active, enabling counting. This enables inter-
rupt generation and input pulse width measurements for pulse inputs of the specified width or greater.
D[7:5] Reserved
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D4 TRMD: Count Mode Select Bit
Selects the 16-bit timer count mode.
1 (R/W): One-shot mode
0 (R/W): Repeat mode (default)
Setting TRMD to 0 sets the 16-bit timer to Repeat mode. In this mode, once the count starts, the 16-bit
timer continues to run until stopped by the application. If the counter underflows, the timer presets the
counter to the reload data register value and continues the count. Thus, the timer periodically outputs an
underflow pulse. Set the 16-bit timer to this mode to generate periodic interrupts at desired intervals or
to generate a serial transfer clock.
Setting TRMD to 1 sets the 16-bit timer to One-shot mode. In this mode, the 16-bit timer stops
automatically as soon as the counter underflows. This means only one interrupt can be generated after
the timer starts. Note that the timer presets the counter to the reload data register value, then stops when
an underflow occurs. Set the 16-bit timer to this mode to set a specific wait time or for pulse width
measurement.
D1 PRESER: Timer Reset Bit
Resets the 16-bit timer.
1 (W): Reset
0 (W): Disabled
0 (R): Normally 0 when read out (default)
Writing 1 to this bit presets the counter to the reload data value.
D0 PRUN: Timer Run/Stop Control Bit
Controls the timer RUN/STOP.
1 (R/W): Run
0 (R/W): Stop (default)
The timer starts counting when PRUN is written as 1 and stops when written as 0. When the timer is
stopped, the counter data is retained until reset or until the next RUN state.
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11.10 Precautions
• The prescaler must run before the 16-bit timer.
• Set the count clock and count mode only while the 16-bit timer count is stopped.
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128-bitTimer(T8F)
12.1 8-bit Timer Overview
The S1C17001 incorporates an 8-bit timer with Fine mode.
The 8-bit timer consists of an 8-bit presettable down counter and an 8-bit reload data register holding the preset
values. The timer counts down from the initial value set in the reload data register and outputs an underflow signal
when the counter underflows. The underflow signal is used to generate an interrupt and UART clock. The under-
flow cycle can be programmed by selecting the prescaler clock and reload data, enabling the application program to
obtain time intervals and serial transfer speeds as required. Fine mode provides a function that minimizes transfer
rate errors.
Figure 12.1.1 illustrates the 8-bit timer configuration.
Reload data register
T8F_TR
PRUN
DF[3:0]
PCLK-1/1 to 1/16 K
Underflow
RUN/STOP control
Internal data bus
Fine mode setting
Interrupt request
Serial transfer clock
To ITC
To UART
Timer reset
Down counter
T8F_TC
Control circuit
PRESER
TFMD[3:0]
Prescaler
8-bit timer
Count clock selection
Figure 12.1.1: 8-bit timer configuration
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12.2 8-bit Timer Count Mode
The 8-bit timer features two count modes: Repeat mode and One-shot mode. These modes are selected using the
TRMD bit (D4/T8F_CTL register).
* TRMD: Count Mode Select Bit in the 8-bit Timer Control (T8F_CTL) Register (D4/0x4206)
Repeat mode (TRMD = 0, default)
Setting TRMD to 0 sets the 8-bit timer to Repeat mode.
In this mode, once the count starts, the 8-bit timer continues running until stopped by the application program.
If the counter underflows, the timer presets the reload data register value into the counter and continues the
count. Thus, the timer periodically outputs an underflow pulse. The 8-bit timer should be set to this mode to
generate periodic interrupts at desired intervals or to generate a serial transfer clock.
One-shot mode (TRMD = 1)
Setting TRMD to 1 sets the 8-bit timer to One-shot mode.
In this mode, the 8-bit timer stops automatically as soon as the counter underflows. This means only one inter-
rupt can be generated after the timer starts. Note that the timer presets the reload data register value to the coun-
ter, then stops after an underflow has occurred. The 8-bit timer should be set to this mode to set a specific wait
time.
Note: Make sure the 8-bit timer count is halted before changing count mode settings.
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12.3 Count Clock
The 8-bit timer uses the prescaler output clock as the count clock. The prescaler generates 15 different clocks by di-
viding the PCLK clock into 1/1 to 1/16 K divisions. One of these is selected by the DF[3:0] bit (D[3:0]/T8F_CLK
register).
* DF[3:0]: Timer Input Clock Select Bits in the 8-bit Timer Input Clock Select (T8F_CLK) Register
(D[3:0]/0x4200)
Table 12.3.1: Count clock selection
DF[3:0] Prescaler output clock DF[3:0] Prescaler output clock
0xf Reserved 0x7 PCLK-1/128
0xe PCLK-1/16384 0x6 PCLK-1/64
0xd PCLK-1/8192 0x5 PCLK-1/32
0xc PCLK-1/4096 0x4 PCLK-1/16
0xb PCLK-1/2048 0x3 PCLK-1/8
0xa PCLK-1/1024 0x2 PCLK-1/4
0x9 PCLK-1/512 0x1 PCLK-1/2
0x8 PCLK-1/256 0x0 PCLK-1/1
(Default: 0x0)
Note: • The prescaler must run before the 8-bit timer.
• Make sure the 8-bit timer count is halted before changing count clock settings.
For detailed information on the prescaler control, see “9 Prescaler (PSC).”
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12.4 8-bit Timer Reload Register and Underflow Cycle
The reload data register T8F_TR (0x4202) is used to set the initial value for the down counter.あ
The initial counter value set in the reload data register is preset to the down counter if the 8-bit timer is reset or the
counter underflows. If the 8-bit timer is started after resetting, the timer counts down from the reload value (initial
value). This means this reload value and the input clock frequency. determines the time elapsed from the point at
which the timer starts until the underflow occurs (or between underflows). The time determined is used to obtain
the specified wait time, the intervals between periodic interrupts, and the programmable serial interface transfer
clock.
One-shot mode
Counter
Repeat mode
Counter
01n-1n n
Preset by timer reset
Preset by timer reset
Auto preset
Underflow
Auto preset
(n = reload data)
01n-1n n
Underflow
Timer start
Timer start
Auto preset
01n-1 n
Underflow
Figure 12.4.1: Preset timing
The underflow cycle can be calculated as follows:
T8F_TR + 1 clk_in
Underflow interval = —————— [s] Underflow cycle = —————— [Hz]
clk_in T8F_TR + 1
clk_in: Count clock (prescaler output clo ck) frequency [Hz]
T8F_TR: Reload data (0 to 255)
Note: The UART generates a sampling clock that divides the 8-bit timer output into 1/16 divisions.
Be careful when setting the transfer rate.
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12.5 8-bit Timer Reset
The 8-bit timer is reset by writing 1 to PRESER bit (D1/T8F_CTL register). The reload data is preset and the coun-
ter is initialized.
* PRESER: Timer Reset Bit in the 8-bit Timer Control (T8F_CTL) Register (D1/0x4206)
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12.6 8-bit Timer RUN/STOP Control
Make the following settings before starting the 8-bit timer:
(1) Set the count mode (One-shot or Repeat). See Section 12.2.
(2) Select the count clock (prescaler output clock). See Section 12.3.
(3) Calculate the initial counter value and set it to the reload data register. See Section 12.4.
(4) Reset the timer and preset the initial value to the counter. See Section 12.5.
(5) If using timer interrupts, set the interrupt level and permit interrupts. See Section 12.9.
To start the 8-bit timer, write 1 to PRUN (D0/T8F_CTL register).
* PRUN: Timer Run/Stop Control Bit in the 8-bit Timer Control (T8F_CTL) Register (D0/0x4206)
The timer starts counting down from the initial value or from the current counter value if no initial value was pre-
set. When the counter underflows, the timer outputs an underflow pulse and presets the counter to the initial value.
An interrupt request is sent simultaneously to the interrupt controller (ITC).
If One-shot mode is set, the timer stops the count.
If Repeat mode is set, the timer continues to count from the reloaded initial value.
Write 0 to PRUN bit to stop the 8-bit timer via the application program. The counter stops counting and retains the
current counter value until either the timer is reset or restarted. To restart the count from the initial value, the timer
should be reset before writing 1 to PRUN.
Resetting the timer while counting is underway sets the counter to the reload register value and continues the count.
Count clock
PRESER writing
PRUN
Counter
Interrupt request
01n-1n n
Count clock
PRESER writing
PRUN
Counter
Interrupt request
01n-1n n 01n-1 n n-1
One-shot mode
Repeat mode
Reset by hardwareSet by software
Set by software Reset by software
Figure 12.6.1: Count operation
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12.7 8-bit Timer Output Signal
The 8-bit timer outputs underflow pulses when the counter underflows.
These pulses are used for timer interrupt requests.
Underflow signal
Timer output
(serial transfer clock)
Interrupt request to ITC
Figure 12.7.1: Timer output clock
The underflow pulses are also used to generate the serial transfer clock and are transmitted to the UART.
Use the following equations to calculate the reload data register value for obtaining the desired transfer rate.
clk_in
bps = —————————————
{(T8F_TR + 1) × 16 + TFMD}
clk_in
T8F_TR =
(
——— - TFMD - 16
)
÷ 16
bps
clk_in: Count clock (prescaler output clock) frequency [Hz]
T8F_TR: Reload data (0 to 255)
bps: Transfer rate (bit/s)
TFMD: Fine mode setting (0 to15)
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12.8 Fine Mode
Fine mode provides a function that minimizes transfer rate errors.
The 8-bit timer can output a programmable clock signal for use as the UART serial transfer clock. The timer output
clock can be set to the required frequency by selecting the appropriate prescaler output clock and reload data. Note
that errors may occur, depending on the transfer rate. Fine mode extends the output clock cycle by delaying the un-
derflow pulse from the counter. This delay can be specified with the TFMD[3:0] bit (D[11:8]/T8F_CTL register).
* TFMD[3:0]: Fine Mode Setup Bits in the 8-bit Timer Control (T8F_CTL) Register (D[11:8]/0x4206)
The TFMD[3:0] bit specifies the delay pattern to be inserted into the 16 underflow intervals. Inserting one delay
extends the output clock cycle by one count clock cycle. This setting delays the interrupt timing in the same way.
Table 12.8.1: Delay patterns specified by TFMD[3:0]
TFMD[3:0] Underflow number
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
0x0 ––––––––––––––––
0x1 –––––––––––––––D
0x2 –––––––D–––––––D
0x3 –––––––D–––D–––D
0x4 – – – D – – – D – – – D – – – D
0x5 – – – D – – – D – – – D – D – D
0x6 –––D–D–D–––D–D–D
0x7 –––D–D–D–D–D–D–D
0x8 –D–D–D–D–D–D–D–D
0x9 –D–D–D–D–D–D–DDD
0xa –D–D–DDD–D–D–DDD
0xb – D – D – D D D – D D D – D D D
0xc – D D D – D D D – D D D – D D D
0xd –DDD–DDD–DDDDDDD
0xe –DDDDDDD–DDDDDDD
0xf –DDDDDDDDDDDDDDD
D: Indicates the insertion of a delay cycle.
Count clock
Underflow signal (no correction)
Underflow signal (with correction)
Output clock (no correction)
Output clock (with correction)
Delay
15 16
15 16
1
1
Figure 12.8.1: Delay cycle insertion in Fine mode
After the initial resetting, TFMD[3:0] is set to 0x0, preventing insertion of delay cycles.
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12.9 8-bit Timer Interrupts
The 8-bit timer outputs interrupt requests to the interrupt controller (ITC) when the counter underflows.
To generate a timer underflow interrupt, the interrupt level and interrupt permission should be set using the ITC
registers.
Timer interrupt ITC register
The 8-bit timer ITC control bits are listed below.
Interrupt flag IIFT0
* IIFT0: 8-bit Timer Interrupt Flag in the Interrupt Flag (ITC_IFLG) Register (D8/0x4300)
Interrupt enable bit IIEN0
* IIEN0: 8-bit Timer Interrupt Enable Bit in the Interrupt Enable (ITC_EN) Register (D8/0x4302)
Interrupt level setting bit IILV0
* IILV0[2:0]: 8-bit Timer Interrupt Level Bits in the Internal Interrupt Level Setup (ITC_ILV0) Register 0
(D[2:0]/0x430e)
If an underflow occurs in the timer, the corresponding interrupt flag is set to 1.
If the interrupt enable bit corresponding to that interrupt flag is set to 1, the ITC sends an interrupt request to
the S1C17 core. To prohibit timer interrupts, set the interrupt enable bit to 0 beforehand. The interrupt flag will
be set to 1 by the timer underflow pulse regardless of the interrupt enable bit setting (i.e., even if set to 0).
The interrupt level setting bit sets the timer interrupt level (0 to 7).
The S1C17 core accepts interrupts when all of the following conditions are satisfied:
• The interrupt enable bit has been set to 1.
• The PSR (S1C17 core internal processor status register) IE (interrupt enable) bit has been set to 1.
• The timer interrupt has a higher interrupt level set than that set for the PSR IL (interrupt level).
• No other interrupt factors having higher precedence (e.g., NMI) are present.
For more information on these interrupt control registers and operations when interrupts occur, see “6 Interrupt
Controller (ITC).”
Interrupt vectors
The 8-bit timer interrupt vector numbers and vector addresses are listed below.
Vector number: 12 (0x0c)
Vector address: 0x8030
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12.10 Control Register Details
Table 12.10.1: 8-bit timer register list
Address Register name Function
0x4200 T8F_CLK 8-bit Timer Input Clock Select Register Prescaler output clock selection
0x4202 T8F_TR 8-bit Timer Reload Data Register Reload data setting
0x4204 T8F_TC 8-bit Timer Counter Data Register Counter data
0x4206 T8F_CTL 8-bit Timer Control Register Timer mode setting and timer RUN/STOP
The 8-bit timer registers are described in detail below. These are 16-bit registers.
Note: When data is written to the registers, the “Reserved” bits must always be written as 0 and not 1.
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0x4200: 8-bit Timer Input Clock Select Register (T8F_CLK)
Register name Address Bit Name Function Setting Init. R/W Remarks
8-bit Timer
Input Clock
Select Register
(T8F_CLK)
0x4200
(16 bits)
D15–4 –reserved – – – 0 when being read.
D3–0 DF[3:0] Timer input clock select
(Prescaler output clock)
DF[3:0] Clock 0x0 R/W
0xf
0xe
0xd
0xc
0xb
0xa
0x9
0x8
0x7
0x6
0x5
0x4
0x3
0x2
0x1
0x0
reserved
PCLK-1/16384
PCLK-1/8192
PCLK-1/4096
PCLK-1/2048
PCLK-1/1024
PCLK-1/512
PCLK-1/256
PCLK-1/128
PCLK-1/64
PCLK-1/32
PCLK-1/16
PCLK-1/8
PCLK-1/4
PCLK-1/2
PCLK-1/1
D[15:4] Reserved
D[3:0] DF[3:0]: Timer Input Clock Select Bits
Select the 8-bit timer count clock from the 15 different prescaler output clocks.
Table 12.10.2: Count clock selection
DF[3:0] Prescaler output clock DF[3:0] Prescaler output clock
0xf Reserved 0x7 PCLK-1/128
0xe PCLK-1/16384 0x6 PCLK-1/64
0xd PCLK-1/8192 0x5 PCLK-1/32
0xc PCLK-1/4096 0x4 PCLK-1/16
0xb PCLK-1/2048 0x3 PCLK-1/8
0xa PCLK-1/1024 0x2 PCLK-1/4
0x9 PCLK-1/512 0x1 PCLK-1/2
0x8 PCLK-1/256 0x0 PCLK-1/1
(Default: 0x0)
Note: Make sure the 8-bit timer count is halted before changing count clock settings.
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0x4202: 8-bit Timer Reload Data Register (T8F_TR)
Register name Address Bit Name Function Setting Init. R/W Remarks
8-bit Timer
Reload Data
Register
(T8F_TR)
0x4202
(16 bits)
D15–8 –reserved – – – 0 when being read.
D7–0 TR[7:0] 8-bit timer reload data
TR7 = MSB
TR0 = LSB
0x0 to 0xff 0x0 R/W
D[15:8] Reserved
D[7:0] TR[7:0]: 8-bit Timer Reload Data
Sets the counter initial value. (Default: 0x0)
The reload data set in this register is preset to the counter if the timer is reset or the counter underflows.
If the 8-bit timer is started after resetting, the timer counts down from the reload value (initial value).
This means this reload value and the input clock frequency determine the time elapsed from the point at
which the timer starts until the underflow occurs (or between underflows). The time determined is used
to obtain the desired wait time, the intervals between periodic interrupts, and the programmable serial
interface transfer clock.
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0x4204: 8-bit Timer Counter Data Register (T8F_TC)
Register name Address Bit Name Function Setting Init. R/W Remarks
8-bit Timer
Counter Data
Register
(T8F_TC)
0x4204
(16 bits)
D15–8 –reserved – – – 0 when being read.
D7–0 TC[7:0] 8-bit timer counter data
TC7 = MSB
TC0 = LSB
0x0 to 0xff 0x0 R
D[15:8] Reserved
D[7:0] TC[7:0]: 8-bit Timer Counter Data
Reads out the counter data. (Default: 0x0)
This register is read-only and cannot be written to.
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0x4206: 8-bit Timer Control Register (T8F_CTL)
Register name Address Bit Name Function Setting Init. R/W Remarks
8-bit Timer
Control Register
(T8F_CTL)
0x4206
(16 bits)
D15–12 –reserved – – – 0 when being read.
D11–8 TFMD[3:0] Fine mode setup 0x0 to 0xf 0x0 R/W
Set a number of times
to insert delay into a
16-underflow period.
D7–5 –reserved – – – 0 when being read.
D4 TRMD Count mode select 1 One shot 0 Repeat 0 R/W
D3–2 –reserved – – – 0 when being read.
D1 PRESER Timer reset 1 Reset 0 Ignored 0 W
D0 PRUN Timer run/stop control 1 Run 0 Stop 0 R/W
D[15:12] Reserved
D[11:8] TFMD[3:0]: Fine Mode Setup Bits
Correct the transfer rate error. (Default: 0x0)
The TFMD[3:0] bit specifies the delay pattern to be inserted into the 16 underflow intervals. Inserting
one delay extends the output clock cycle by one count clock cycle. This setting delays the interrupt tim-
ing in the same way.
Table 12.10.3: Delay patterns specified by TFMD[3:0]
TFMD[3:0] Underflow number
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
0x0 ––––––––––––––––
0x1 –––––––––––––––D
0x2 –––––––D–––––––D
0x3 –––––––D–––D–––D
0x4 – – – D – – – D – – – D – – – D
0x5 – – – D – – – D – – – D – D – D
0x6 –––D–D–D–––D–D–D
0x7 –––D–D–D–D–D–D–D
0x8 –D–D–D–D–D–D–D–D
0x9 –D–D–D–D–D–D–DDD
0xa –D–D–DDD–D–D–DDD
0xb – D – D – D D D – D D D – D D D
0xc – D D D – D D D – D D D – D D D
0xd –DDD–DDD–DDDDDDD
0xe –DDDDDDD–DDDDDDD
0xf –DDDDDDDDDDDDDDD
D: Indicates the insertion of a delay cycle.
Count clock
Underflow signal (no correction)
Underflow signal (with correction)
Output clock (no correction)
Output clock (with correction)
Delay
15 16
15 16
1
1
Figure 12.10.1: Delay cycle insertion in Fine mode
D[7:5] Reserved
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D4 TRMD: Count Mode Select Bit
Selects the 8-bit timer count mode.
1 (R/W): One-shot mode
0 (R/W): Repeat mode (default)
Setting TRMD to 0 sets the 8-bit timer to Repeat mode. In this mode, once the count starts, the 8-bit
timer continues to run until stopped by the application. If the counter underflows, the timer presets the
counter to the reload data register value and continues the count. Thus, the timer periodically outputs an
underflow pulse. Set the 8-bit timer to this mode to generate periodic interrupts at desired intervals or to
generate a serial transfer clock.
Setting TRMD to 1 sets the 8-bit timer to One-shot mode. In this mode, the 8-bit timer stops automati-
cally as soon as the counter underflows. This means only one interrupt can be generated after the timer
starts. Note that the timer presets the counter to the reload data register value, then stops when an un-
derflow occurs. Set the 8-bit timer to this mode to set a specific wait time.
Note: Make sure the 8-bit timer count is halted before changing count mode settings.
D[3:2] Reserved
D1 PRESER: Timer Reset Bit
Resets the 8-bit timer.
1 (W): Reset
0 (W): Disabled
0 (R): Normally 0 when read out (default)
Writing 1 to this bit presets the counter to the reload data value.
D0 PRUN: Timer Run/Stop Control Bit
Controls the timer RUN/STOP.
1 (R/W): Run
0 (R/W): Stop (default)
The timer starts counting when PRUN is written as 1 and stops when written as 0. When the timer is
stopped, the counter data is retained until reset or until the next RUN state.
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12.11 Precautions
• The prescaler must run before the 8-bit timer.
• Set the count clock and count mode only while the 8-bit timer count is stopped.
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13PWM&CaptureTimer(T16E)
13.1 PWM & Capture Timer Overview
The S1C17001 incorporates a single-channel PWM & capture timer.
Figure 13.1.1 illustrates the PWM & capture timer configuration.
Compare data A register
T16E_CA
T16EDF[3:0]
PCLK-1/1 to 1/16K
Internal data bus
Prescaler clock selection
Compare A interrupt request
Compare B interrupt request
PWM output
To ITC
TOUT (P26)
EXCL3 (P27)
Compare data B register
T16E_CB
Compare A
signal
Up-counter
T16E_TC
Count
control
circuit
Output
control
circuit
Interrupt
control
circuit
Comparator
CLKSEL
Input clock selection
RUN/STOP control T16ERUN
Clock output enable OUTEN
Initial output level selection INITOL
Inverted output INVOUT
Fine mode selection SELFM
Timer reset T16ERST
Compare buffer enable
Compare A interrupt enable
CBUFEN
CAIE
Compare B interrupt enable
CBIE
Prescaler
Compare data A buffer
(T16E_CA)
Compare data B buffer
(T16E_CB)
Compare B
signal Comparator
PWM & capture timer
Figure 13.1.1: PWM & capture timer configuration
The PWM & capture timer includes a 16-bit up-counter (T16E_TC register), two 16-bit compare data registers
(T16E_CA and T16E_CB registers), and the corresponding buffers.
The 16-bit counter can be reset to 0 or set to a counter value by software and counts up for external signals from the
prescaler output clock or P27 port pin. The count value can be read by software.
The compare data A and B registers hold data for comparison against the up-counter contents. Data can be read or
written directly to or from the compare data registers. The compare data buffers enables loading to the compare
data registers of comparison values set when the counter is reset by software or by a compare B match signal.
Software can be used to set which of the compare data register and buffer the comparison values are written to.
If the counter value matches the contents of each compare data register, the comparator outputs a signal to control
interrupts and output signals. These registers can be used to program the interrupt occurrence cycle and output
clock frequency and duty ratio.
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13.2 PWM & Capture Timer Operating Modes
The PWM & capture timer has the following two operating modes:
1. Internal clock mode (Timer counting internal clock)
2. External clock mode (Functions as event counter)
The operating mode is selected using CLKSEL (D3/T16E_CTL register).
* CLKSEL: Input Clock Select Bit in the PWM Timer Control (T16E_CTL) Register (D3/0x5306)
Setting CLKSEL to 0 (default) selects internal clock mode, while setting to 1 selects external clock mode.
Internal clock mode
Internal clock mode uses the prescaler output clock as the count clock.
The count clock is selected by the T16EDF[3:0] (D[3:0]/T16E_CLK register) from the 15 types generated by
the prescaler dividing the PCLK clock into 1/1 to 1/16 K divisions.
* T16EDF[3:0]: Timer Input Clock Select Bits in the PWM Timer Input Clock Select (T16E_CLK) Register
(D[3:0]/0x5308)
Table 13.2.1: Prescaler clock selection
T16EDF[3:0] Prescaler output clock T16EDF[3:0] Prescaler output clock
0xf Reserved 0x7 PCLK-1/128
0xe PCLK-1/16384 0x6 PCLK-1/64
0xd PCLK-1/8192 0x5 PCLK-1/32
0xc PCLK-1/4096 0x4 PCLK-1/16
0xb PCLK-1/2048 0x3 PCLK-1/8
0xa PCLK-1/1024 0x2 PCLK-1/4
0x9 PCLK-1/512 0x1 PCLK-1/2
0x8 PCLK-1/256 0x0 PCLK-1/1
(Default: 0x0)
Note: • The prescaler must run before operating the PWM & capture timer in internal clock mode.
• Make sure the PWM & capture timer count is halted before changing count clock settings.
For detailed information on the prescaler control, see “9 Prescaler (PSC).”
External clock mode
External clock mode uses the clock and pulses input via the P27 (EXCL3) port as a count clock. These inputs
can also be used as an event counter. Timer operations other than the input clock are the same as for internal
clock mode.
To input the EXCL3 clock from the P27 port, P27MUX (D7/P2_PMUX register) must be written as 1 and the
P27 pin function must be changed.
* P27MUX: P27 Port Function Select Bit in the P2 Port Function Select (P2_PMUX) Register
The PWM & capture timer increments counts based on the input signal rising edge.
The PWM & capture timer does not use the prescaler in this mode. If no other peripheral modules are using the
prescaler clock, the prescaler can be stopped to reduce current consumption.
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13.3 Setting and Resetting Counter Value
The PWM & capture timer counter can be reset to 0 by writing 1 to the T16ERST bit (D1/T16E_CTL register).
* T16ERST: Timer Reset Bit in the PWM Timer Control (T16E_CTL) Register (D1/0x5306)
Normally, the counter should be reset by writing 1 to this bit before starting the count.
The counter is reset by hardware if the counter matches compare data B after the count starts.
The counter can also be set to any desired value by writing data to T16ETC[15:0] (D[15:0]/T16E_TC register).
* T16ETC[15:0]: Counter Data in the PWM Timer Counter Data (T16E_TC) Register (D[15:0]/0x5304)
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13.4 Compare Data Settings
Compare data register/buffer selection
The PWM & capture timer incorporates a data comparator allowing comparison of counter data against any
desired value. This comparison data is stored in the compare data A and B registers. Data can be read or written
directly to or from the compare data registers.
The compare data buffers enable automatic loading to the compare data registers of the comparison values set
in the buffers when the counter is reset by software (writing 1 to T16ERST) or by a compare B match signal.
The CBUFEN (D5/0x5306) is used to set which of the compare data register and buffer the comparison values
are written to.
* CBUFEN: Comparison Buffer Enable Bit in the PWM Timer Control (T16E_CTL) Register (D5/0x5306)
Writing 1 to CBUFEN selects the compare data buffer. Writing 0 to it selects the compare data register. The
compare data register is selected after initial resetting.
Compare data writing
Compare data A is written to T16ECA[15:0] (D[15:0]/T16E_CA register). Compare data B is written to
T16ECB[15:0] (D[15:0]/T16E_CB register).
* T16ECA[15:0]: Compare Data A in the PWM Timer Compare Data A (T16E_CA) Register (D[15:0]/0x5300)
* T16ECB[15:0]: Compare Data B in the PWM Timer Compare Data B (T16E_CB) Register (D[15:0]/0x5302)
When CBUFEN is set to 0, the compare data register values can be read or written directly by these registers.
When CBUFEN is set to 1, data is read from and written to these registers via the compare data buffers. The
buffer contents are loaded into the compare data registers when the counter is reset.
The compare data registers and buffers are set to 0x0 after initial resetting.
The timer compares the count data against the compare data registers and generates a compare match signal if
the values are equal. This compare match signal generates an interrupt and controls the clock (TOUT signal)
output externally.
Compare data B also determines the counter reset cycle.
The counter reset cycle can be calculated as follows:
CB + 1
Counter reset interval= ———— [s]
clk_in
clk_in
Counter reset cycle = ———— [Hz]
CB + 1
CB: Compare data B (T16E_CB register value)
clk_in: Prescaler output clock frequency
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13.5 PWM & Capture Timer RUN/STOP Control
Set the following before starting the PWM & capture timer.
(1) Set the operating mode (input clock). See Section 13.2.
(2) Set the clock output. See Section 13.6.
(3) If using interrupts, set the interrupt level and permit interrupts for the PWM & capture timer. See Section 13.7.
(4) Set the counter value or reset to 0. See Section 13.3.
(5) Set the compare data. See Section 13.4.
The PWM & capture timer includes T16ERUN (D0/T16E_CTL register) to control Run/Stop.
* T16ERUN: Timer Run/Stop Control Bit in the PWM Timer Control (T16E_CTL) Register (D0/0x5306)
The timer starts counting when T16ERUN is written as 1. Writing 0 to T16ERUN prevents clock input and stops
the count.
This control does not affect the counter data. The counter data is retained even when the count is halted, allowing
resumption of the count from that data.
If T16ERUN and T16ERST are written as 1 simultaneously, the timer starts counting after the reset.
If the counter matches the compare data A register setting during counting, a compare A match signal is output and
a compare A interrupt factor generated.
Likewise, if the counter matches the compare data B register setting, a compare B match signal is output and a
compare B interrupt factor generated. The counter is reset to 0 at the same time. If CBUFEN is set to 1, the value
set in the compare data buffers is loaded into the compare data registers. If interrupts are permitted, an interrupt re-
quest is sent to the interrupt controller (ITC).
In either case, counting continues unaffected. For compare B, counting starts from the counter value 0.
T16ERUN
T16ERST
T16E_CA
T16E_CB
Input clock
T16E_TC
Reset Compare A
interrupt
Reset and
compare B
interrupt
Compare A
interrupt
Reset and
compare B
interrupt
0x2
01234501234501
0x5
Figure 13.5.1: Basic counter operation timing
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13.6 Clock Output Control
The PWM & capture timer can generate a TOUT signal using the compare match signal.
Figure 13.6.1 shows the PWM & capture timer clock output circuit.
Logic
INITOL
Compare A
Compare B
Clock OUTEN
TOUT (P26)
INVOUT
D Q
Q
Figure 13.6.1: PWM & capture timer clock output circuit
Initial output level settings
The default output level is 0 (Low level) while the clock output is Off. This can be changed to 1 (High level) by
INITOL (D8/T16E_CTL register).
* INITOL: Initial Output Level Select Bit in the PWM Timer Control (T16E_CTL) Register (D8/0x5306)
The initial output level is Low when INITOL is 0 (default). Setting to 1 switches the initial output level to High.
The timer output will switch to the initial output level set here even when the timer is reset by writing 1 to
T16ERST.
Output signal polarity selection
By default, an active High (normal Low) output signal is generated. This logic can be inverted by INVOUT (D4/
T16E_CTL register). Writing 1 to INVOUT causes the timer to generate an active Low (normal High) signal.
* INVOUT: Inverse Output Control Bit in the PWM Timer Control (T16E_CTL) Register (D4/0x5306)
Setting INVOUT to 1 also inverts the initial output level set for INITOL.
For detailed information on the output waveform, refer to Figure 13.6.2.
Output pin setting
The TOUT signal generated here can be output from the TOUT (P26) pin. This signal can provide a program-
mable clock and PWM signal to external devices.
The P26 pin used for output is set for input/output port use after initial resetting and switches to input mode.
The pin then becomes high-impedance.
Switching the pin function to TOUT output outputs the level set by INITOL and INVOUT. After the timer out-
put starts, the output is maintained at this level until changed by the counter value.
Table 13.6.1: Initial output level
INITOL INVOUT Initial output level
1 1 Low
1 0 High
0 1 High
0 0 Low
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Clock output start
To output the TOUT clock, write 1 to OUTEN (D2/T16E_CTL register). Writing 0 to OUTEN switches the
output to the initial output level as set by INITOL and INVOUT.
* OUTEN: Clock Output Enable Bit in the PWM Timer Control (T16E_CTL) Register (D2/0x5306)
Figure 13.6.2 illustrates the output waveform.
Input clock
T16ERST
OUTEN
T16ERUN
Counter value
Compare A signal
Compare B signal
TOUT output (INITOL = 0, INVOUT = 0)
TOUT output (INITOL = 0, INVOUT = 1)
TOUT output (INITOL = 1, INVOUT = 0)
TOUT output (INITOL = 1, INVOUT = 1)
1234500 1 234501234501
(When T16E_CA = 3 and T16E_CB = 5)
Figure 13.6.2: PWM & capture timer output waveform
When INVOUT = 0 (Active High)
The timer outputs Low level (initial output level at output start) until the counter matches the compare data A
set in the T16E_CA register (0x5300). When the counter reaches the next compare data A value, the output pin
switches to High level, and a compare A interrupt factor is generated. If the counter subsequently counts up to
compare data B set in the T16E_CB register (0x5302), the counter is reset and the output pin is returned to the
Low level. A compare B interrupt factor is also generated at the same time.
When INVOUT = 1 (Active Low)
The timer outputs High level (inverted value of the initial output level at output start) until the counter matches
the compare data A set in the T16E_CA register (0x5300). When the counter reaches the next compare data A
value, the output pin switches to Low level, and a compare A interrupt factor is generated. If the counter subse-
quently counts up to compare data B set in the T16E_CB register (0x5302), the counter is reset and the output
pin is returned to the High level. A compare B interrupt factor is also generated at the same time.
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Clock output Fine mode settings
With the default settings, the clock output changes at the input clock rise-up if the counter value matches the
compare data A.
If the counter data register T16ETC[14:0] matches the compare data A register T16ECA0[15:1], the Fine mode
clock output changes in accordance with the compare data A bit 0 (T16ECA0) value.
When T16ECA0 is 0: Changes at input clock rise-up.
When T16ECA0 is 1: Changes at half-cycle delayed input clock drop-off.
Input clock
Counter value
T16E_CA
T16E_CB
Compare A signal
Compare B signal
TOUT output (INVOUT = 0)
TOUT output (INVOUT = 1)
0
23456
123450123450123450123450123
5
Figure 13.6.3: Fine mode clock output
The output duty can thus be adjusted in Fine mode in input clock half-cycle steps. Note that a pulse will be out-
put with an input clock 1-cycle width when compare data A = 0 (same as for default). The maximum value for
compare data B in Fine mode is 215 – 1 = 32,767, and the compare data A range will be 0 to (2 x compare data
B - 1).
Fine mode is set by SELFM (D6/T16E_CTL register).
* SELFM: Fine Mode Select Bit in the PWM Timer Control (T16E_CTL) Register (D6/0x5306)
Writing 1 to SELFM sets Fine mode. Fine mode is disabled after initial resetting.
Precautions
(1) Compare data should be set with A ≥ 0 and B ≥ 1 when using the timer output. The minimum settings are A
= 0 and B = 1, and the timer output cycle is half the input clock.
(2) Setting compare data with A > B (A > B x 2 for Fine mode) generates a compare B match signal only. It
does not generate a compare A match signal. In this case, the timer output is fixed at Low (High when IN-
VOUT = 1).
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13.7 PWM & Capture Timer Interrupts
The T16E module includes functions for generating the following two kinds of interrupts:
• Compare A match interrupt
• Compare B match interrupt
The T16E module outputs a single interrupt signal shared by the above two interrupt factors to the interrupt control-
ler (ITC). The interrupt flag within the T16E module should be read to identify the interrupt factor that occurred.
Compare A match interrupt
This interrupt request is generated when the counter matches the compare data A register setting during count-
ing. It sets the interrupt flag CAIF (D0/T16E_IFLG register) within the T16E module to 1.
* CAIF: Compare A Interrupt Flag in the PWM Timer Interrupt Flag (T16E_IFLG) Register (D0/0x530c)
To use this interrupt, set CAIE (D0/T16E_IMSK register) to 1. If CAIE is set to 0 (default), CAIF is not set to 1,
and the interrupt request for this factor is not sent to the ITC.
* CAIE: Compare A Interrupt Enable Bit in the PWM Timer Interrupt Mask (T16E_IMSK) Register (D0/0x530a)
If CAIF is set to 1, the T16E module outputs an interrupt request to the ITC. This interrupt request signal sets
the PWM & capture timer interrupt flag inside the ITC to 1 and generates an interrupt if the ITC and S1C17
core interrupt conditions are satisfied.
The CAIF should be read and checked in the PWM & capture timer interrupt processing routine to determine
whether the PWM & capture timer interrupt is due to compare A matching.
The interrupt factor should be cleared with the interrupt processing routine by resetting the T16E module CAIF
(to 1) rather than the ITC PWM & capture timer interrupt flag.
Compare B match interrupt
This interrupt request is generated when the counter matches the compare data B register setting during count-
ing. It sets the interrupt flag CBIF (D1/T16E_IFLG register) within the T16E module to 1.
* CBIF: Compare B Interrupt Flag in the PWM Timer Interrupt Flag (T16E_IFLG) Register (D1/0x530c)
To use this interrupt, set CBIE (D1/T16E_IMSK register) to 1. If CBIE is set to 0 (default), CBIF is not set to 1,
and the interrupt request for this factor is not sent to the ITC.
* CBIE: Compare B Interrupt Enable Bit in the PWM Timer Interrupt Mask (T16E_IMSK) Register (D1/0x530a)
If CBIF is set to 1, the T16E module outputs an interrupt request to the ITC. This interrupt request signal sets
the PWM & capture timer interrupt flag inside the ITC to 1 and generates an interrupt if the ITC and S1C17
core interrupt conditions are satisfied.
The CBIF should be read and checked in the PWM & capture timer interrupt processing routine to determine
whether the PWM & capture timer interrupt is due to compare B matching.
The interrupt factor should be cleared with the interrupt processing routine by resetting the T16E module CBIF (to
1) rather than the ITC PWM & capture timer interrupt flag.
Note: To prevent generating unnecessary interrupts, reset the corresponding CAIF or CBIF before
permitting compare A or compare B interrupts from CAIE or CBIE.
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PWM & capture timer interrupt ITC register
The T16E module outputs an interrupt signal to the ITC if a compare match with interrupt permitted is gener-
ated by the settings previously described. To generate PWM & capture timer interrupts, the interrupt level and
interrupt permission should be set in the ITC register.
The PWM & capture timer ITC control bits are shown below.
Interrupt flag inside ITC
* EIFT7: PWM & Capture Timer Interrupt Flag in the Interrupt Flag (ITC_IFLG) Register (D7/0x4300)
Interrupt enable bit inside ITC
* EIEN7: PWM & Capture Timer Interrupt Enable Bit in the Interrupt Enable (ITC_EN) Register (D7/0x4302)
Interrupt level setting bit inside ITC
*
EILV7[2:0]: T16E Interrupt Level Bits in the External Interrupt Level Setup (ITC_ELV3) Register 3
(D[10:8]/0x430c)
Interrupt trigger mode selection bit inside ITC (Fix at 1)
*
EITG7: T16E Interrupt Trigger Mode Select Bit in the External Interrupt Level Setup (ITC_ELV3) Register 3
(D12/0x430c)
EIFT7 is set to 1 when a compare match is generated with interrupt permitted in the T16E module. If EIEN7 is
set to 1 here, the ITC sends an interrupt request to the S1C17 core. To prevent PWM & capture timer interrupts,
set the EIEN7 to 0. EIFT7 is set to 1 by the interrupt signal from the T16E module regardless of the EIEN7 set-
ting (even if it is set to 0).
EILV7[2:0] sets the PWM & capture timer interrupt level (0 to 7).
The S1C17 core accepts interrupts when the following conditions are satisfied:
• The interrupt enable bit has been set to 1.
• The PSR (S1C17 core internal processor status register) IE (interrupt enable) bit has been set to 1.
• The PWM & capture timer interrupt has been set to a higher interrupt level than that set for the PSR IL (interrupt
level).
• No other interrupt factors having higher precedence (e.g., NMI) are present.
For detailed information on these interrupt control registers and operations when interrupts occur, refer to “6
Interrupt Controller (ITC).”
Note: The following processes must be performed to manage the interrupt factor occurrence state
using the T16E module interrupt flag.
1. Set the ITC PWM & capture timer interrupt trigger mode to level trigger mode.
2. Reset the T16E module interrupt flags CAIF and CBIF within the interrupt processing routine
after the interrupt occurs (this also resets the ITC interrupt flag).
Interrupt vectors
The PWM & capture timer interrupt vector numbers and vector addresses are listed below.
Vector number: 11 (0x0b)
Vector address: 0x802c
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13.8 Control Register Details
Table 13.8.1: PWM & capture timer register list
Address Register name Function
0x5300 T16E_CA PWM Timer Compare Data A Register Compare data A setting
0x5302 T16E_CB PWM Timer Compare Data B Register Compare data B setting
0x5304 T16E_TC PWM Timer Counter Data Register Counter data
0x5306 T16E_CTL PWM Timer Control Register Timer mode setting and timer RUN/STOP
0x5308 T16E_CLK PWM Timer Input Clock Select Register Prescaler output clock selection
0x530a T16E_IMSK PWM Timer Interrupt Mask Register Interrupt mask setting
0x530c T16E_IFLG PWM Timer Interrupt Flag Register Interrupt occurrence status display/resetting
The PWM & capture timer registers are described in detail below. These are 16-bit registers.
Note: When data is written to the registers, the “Reserved” bits must always be written as 0 and not 1.
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0x5300: PWM Timer Compare Data A Register (T16E_CA)
Register name Address Bit Name Function Setting Init. R/W Remarks
PWM Timer
Compare Data
A Register
(T16E_CA)
0x5300
(16 bits)
D15–0
T16ECA[15:0]
Compare data A
T16ECA15 = MSB
T16ECA0 = LSB
0x0 to 0xffff 0x0 R/W
D[15:0] T16ECA[15:0]: Compare Data A
Sets the PWM & capture timer compare data A. (Default: 0x0)
When CBUFEN (D5/T16E_CTL register) is set to 0, this register can be used to directly read from or
directly write to the compare data A register.
When CBUFEN is set to 1, data is read from and written to these registers via the compare data A buf-
fer. The buffer contents are loaded into the compare data A register when the counter is reset.
The data set is compared against the counter data, and a compare A interrupt factor is generated if the
contents match. The timer output waveform changes at the same time (rising when INVOUT (D4/
T16E_CTL register) = 0 and trailing when INVOUT = 1). These processes do not affect the counter
data or the count process.
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0x5302: PWM Timer Compare Data B Register (T16E_CB)
Register name Address Bit Name Function Setting Init. R/W Remarks
PWM Timer
Compare Data
B Register
(T16E_CB)
0x5302
(16 bits)
D15–0
T16ECB[15:0]
Compare data B
T16ECB15 = MSB
T16ECB0 = LSB
0x0 to 0xffff 0x0 R/W
D[15:0] T16ECB[15:0]: Compare Data B
Sets the PWM & capture timer compare data B. (Default: 0x0)
When CBUFEN (D5/T16E_CTL register) is set to 0, this register can be used to directly read from or
directly write to the compare data B register.
When CBUFEN is set to 1, data is read from and written to these registers via the compare data B buf-
fer. The buffer contents are loaded into the compare data B register when the counter is reset.
The data set is compared against the counter data, and a compare B interrupt factor is generated if the
contents match. The timer output waveform changes at the same time (rising when INVOUT (D4/
T16E_CTL register) = 0 and trailing when INVOUT = 1). The counter is reset to 0.
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0x5304: PWM Timer Counter Data Register (T16E_TC)
Register name Address Bit Name Function Setting Init. R/W Remarks
PWM Timer
Counter Data
Register
(T16E_TC)
0x5304
(16 bits)
D15–0
T16ETC[15:0]
Counter data
T16ETC15 = MSB
T16ETC0 = LSB
0x0 to 0xffff 0x0 R/W
D[15:0] T16ETC[15:0]: Counter Data
Counter data can be read out. (Default: 0x0)
The counter value can also be set by writing data to this register.
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0x5306: PWM Timer Control Register (T16E_CTL)
Register name Address Bit Name Function Setting Init. R/W Remarks
PWM Timer
Control Register
(T16E_CTL)
0x5306
(16 bits)
D15–9 –reserved – – – 0 when being read.
D8 INITOL Initial output level 1 High 0 Low 0 R/W
D7 –reserved – – – 0 when being read.
D6 SELFM Fine mode select 1 Fine mode 0
Normal mode
0 R/W
D5 CBUFEN Comparison buffer enable 1 Enable 0 Disable 0 R/W
D4 INVOUT Inverse output 1 Invert 0 Normal 0 R/W
D3 CLKSEL Input clock select 1 External 0 Internal 0 R/W
D2 OUTEN Clock output enable 1 Enable 0 Disable 0 R/W
D1 T16ERST Timer reset 1 Reset 0 Ignored 0 W 0 when being read.
D0 T16ERUN Timer run/stop control 1 Run 0 Stop 0 R/W
D[15:9] Reserved
D8 INITOL: Initial Output Level Bit
Sets the timer output initial output level.
1 (R/W): High
0(R/W): Low (default)
The timer output pin switches to the initial output level set here when the clock output is switched off
by writing 0 to OUTEN (D2) or when the timer is reset by writing 1 to T16ERST (D1). Note that this
level will be inverted when INVOUT (D4) is 1.
D7 Reserved
D6 SELFM: Fine Mode Select Bit
Sets the clock output to Fine mode.
1 (R/W): Fine mode
0 (R/W): Normal output (default)
When SELFM is set to 1, the clock output is set to Fine mode, and the output clock duty becomes ad-
justable in input clock half-cycle steps.
When SELFM is set to 0, normal clock output is used.
D5 CBUFEN: Comparison Buffer Enable Bit
Permits and prevents writing to the compare data buffer.
1 (R/W): Permitted
0 (R/W): Prohibited (default)
When CBUFEN is set to 1, compare data is read and written via the compare data buffer. The buffer
contents are loaded into the compare data register when the counter is reset by software or compare B
signal.
When CBUFEN is set to 0, compare data is read and written directly to and from the compare data reg-
ister.
D4 INVOUT: Inverse Output Control Bit
Selects the timer output signal polarity.
1 (R/W): Inverted (active Low)
0 (R/W): Normal (active High) (default)
Writing 1 to INVOUT generates a TOUT output active Low signal (Off level = High). When INVOUT
is 0, an active High signal (Off level = Low) is generated.
Writing 1 to this bit also inverts the initial output level set by INITOL (D8).
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D3 CLKSEL: Input Clock Select Bit
Selects the timer input clock.
1 (R/W): External clock
0 (R/W): Internal clock (default)
If CLKSEL is written as 0, the internal clock (prescaler output) is selected as the timer input clock. If
written as 1, the external clock (clock input from EXCL3 (P27) pin) is selected and functions as an
event counter.
Note: To input the EXCL3 clock from the P27 port, P27MUX (D7/P2_PMUX register) must be
written as 1, and the P27 pin function must be changed beforehand.
* P27MUX: P27 Port Function Select Bit in the P2 Port Function Select (P2_PMUX) Register
D2 OUTEN: Clock Output Enable Bit
Controls the TOUT signal (timer output clock) output.
1 (R/W): Permitted
0 (R/W): Prohibited (default)
Writing 1 to OUTEN outputs the TOUT signal from the TOUT (P26) output pin. Writing 0 to OUTEN
halts output and switches to Off level in accordance with the INVOUT(D4) and INITOL(D8) settings.
P26 must be set to the TOUT pin using the P26 port function selection register before outputting the
TOUT signal.
D1 T16ERST: Timer Reset Bit
Resets the counter.
1 (W): Reset
0 (W): Disabled
0 (R): Normally 0 when read out (default)
Writing 1 to T16ERST resets the PWM & capture timer counter.
D0 T16ERUN: Timer Run/Stop Control Bit
Controls the timer Run/Stop.
1 (R/W): Run
0 (R/W): Stop (default)
The PWM & capture timer starts the count when T16ERUN is written as 1 and stops when written as 0.
The counter data is retained when stopped until the subsequent reset or run. Counting can be resumed
when switched from Stop to Run from the data retained.
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0x5308: PWM Timer Input Clock Select Register (T16E_CLK)
Register name Address Bit Name Function Setting Init. R/W Remarks
PWM Timer
Input Clock
Select Register
(T16E_CLK)
0x5308
(16 bits)
D15–4 –reserved – – – 0 when being read.
D3–0
T16EDF[3:0]
Timer input clock select
(Prescaler output clock)
T16EDF[3:0] Clock 0x0 R/W
0xf
0xe
0xd
0xc
0xb
0xa
0x9
0x8
0x7
0x6
0x5
0x4
0x3
0x2
0x1
0x0
reserved
PCLK-1/16384
PCLK-1/8192
PCLK-1/4096
PCLK-1/2048
PCLK-1/1024
PCLK-1/512
PCLK-1/256
PCLK-1/128
PCLK-1/64
PCLK-1/32
PCLK-1/16
PCLK-1/8
PCLK-1/4
PCLK-1/2
PCLK-1/1
D[15:4] Reserved
D[3:0] T16EDF[3:0]: Timer Input Clock Select Bits
Select the PWM & capture timer count clock from the 15 different prescaler output clocks.
Table 13.8.2: Count clock selection
T16EDF[3:0] Prescaler output clock T16EDF[3:0] Prescaler output clock
0xf Reserved 0x7 PCLK-1/128
0xe PCLK-1/16384 0x6 PCLK-1/64
0xd PCLK-1/8192 0x5 PCLK-1/32
0xc PCLK-1/4096 0x4 PCLK-1/16
0xb PCLK-1/2048 0x3 PCLK-1/8
0xa PCLK-1/1024 0x2 PCLK-1/4
0x9 PCLK-1/512 0x1 PCLK-1/2
0x8 PCLK-1/256 0x0 PCLK-1/1
(Default: 0x0)
Note: Make sure the PWM & capture timer count is halted before changing count clock settings.
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0x530a: PWM Timer Interrupt Mask Register (T16E_IMSK)
Register name Address Bit Name Function Setting Init. R/W Remarks
PWM Timer
Interrupt
Mask Register
(T16E_IMSK)
0x530a
(16 bits)
D15–2 –reserved – – – 0 when being read.
D1 CBIE Compare B interrupt enable 1 Enable 0 Disable 0 R/W
D0 CAIE Compare A interrupt enable 1 Enable 0 Disable 0 R/W
D[15:2] Reserved
D1 CBIE: Compare B Interrupt Enable Bit
Permits or prohibits compare B match interrupts.
1 (R/W): Interrupt permitted
0 (R/W): Interrupt prohibited (default)
Setting CBIE to 1 permits compare B interrupt requests to the ITC. Setting it to 0 prohibits interrupts.
The ITC PWM & capture timer interrupt enable bits must also be set to permit interrupts in order to
generate interrupts.
D0 CAIE: Compare A Interrupt Enable Bit
Permits or prohibits compare A match interrupts.
1 (R/W): Interrupt permitted
0 (R/W): Interrupt prohibited (default)
Setting CAIE to 1 permits compare A interrupt requests to the ITC. Setting it to 0 prohibits interrupts.
The ITC PWM & capture timer interrupt enable bits must also be set to permit interrupts in order to
generate interrupts.
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0x530c: PWM Timer Interrupt Flag Register (T16E_IFLG)
Register name Address Bit Name Function Setting Init. R/W Remarks
PWM Timer
Interrupt
Flag Register
(T16E_IFLG)
0x530c
(16 bits)
D15–2 –reserved – – – 0 when being read.
D1 CBIF Compare B interrupt flag 1 Cause of
interrupt
occurred
0 Cause of
interrupt not
occurred
0 R/W Reset by writing 1.
D0 CAIF Compare A interrupt flag 0 R/W
D[15:2] Reserved
D1 CBIF: Compare B Interrupt Flag
Interrupt flag indicating the compare B interrupt factor occurrence status.
1(R): Interrupt factor present
0(R): No interrupt factor (default)
1(W): Reset flag
0(W): Disabled
CBIF is the interrupt flag corresponding to compare B interrupts. Setting CBIE (D1/T16E_IMSK) to 1
sets this to 1 when the counter matches the compare data B register setting during counting. A PWM &
capture timer interrupt request signal is output to the ITC at the same time. This interrupt request signal
sets the ITC PWM & capture timer interrupt flag to 1 and generates an interrupt if the ITC and S1C17
core interrupt conditions are satisfied.
D0 CAIF: Compare A Interrupt Flag
Interrupt flag indicating the compare A interrupt factor occurrence status.
1(R): Interrupt factor present
0(R): No interrupt factor (default)
1(W): Reset flag
0(W): Disabled
CAIF is the interrupt flag corresponding to compare A interrupts. Setting CAIE (D0/T16E_IMSK) to 1
sets this to 1 when the counter matches the compare data A register setting during counting. A PWM &
capture timer interrupt request signal is output to the ITC at the same time. This interrupt request signal
sets the ITC PWM & capture timer interrupt flag to 1 and generates an interrupt if the ITC and S1C17
core interrupt conditions are satisfied.
The following processes must be performed to manage the interrupt factor occurrence state using this
register.
1. Set the ITC PWM & capture timer interrupt trigger mode to level trigger mode.
2. Reset the T16E module interrupt flags CAIF and CBIF within the interrupt processing routine after
the interrupt occurs (this also resets the ITC interrupt flag).
CAIF and CBIF are reset by writing as 1.
Note: To prevent generating unnecessary interrupts, reset the corresponding CAIF or CBIF be-
fore permitting compare A or compare B interrupts from CAIE (D0/T16E_IMSK) or CBIE (D1/
T16E_IMSK).
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13.9 Precautions
• The prescaler must run before operating the PWM & capture timer.
• Make sure the PWM & capture timer count is halted before changing count clock settings.
• Compare data should be set with A ≥ 0 and B ≥ 1 when using the timer output. The minimum settings are A = 0
and B = 1, and the timer output cycle is half the input clock.
• Setting compare data with A > B (A > B x 2 for Fine mode) generates a compare B match signal only. It does not
generate a compare A match signal. In this case, the timer output is fixed at Low (High when INVOUT = 1).
• To prevent generating unnecessary interrupts, reset the corresponding CAIF (D0/T16E_IFLG register) or CBIF
(D1/T16E_IFLG register) before permitting compare A or compare B interrupts from CAIE (D0/T16E_IMSK
register) or CBIE (D1/T16E_IMSK register).
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148-bitOSC1Timer(T8OSC1)
14.1 8-bit OSC1 Timer Overview
The S1C17001 incorporates a single-channel 8-bit OSC1 timer that uses the OSC1 clock as its oscillation source.
Figure 14.1.1 illustrates the 8-bit OSC1 timer configuration.
Compare data register
T8OSC1_CMP
OSC1-1/1 to 1/32
Internal data bus
Compare match interrupt request
To ITC
Compare
match
signal
Up counter
T8OSC1_CNT
Count
control
circuit
Interrupt
control circuit
Comparator
RUN/STOP control T8ORUN
Timer reset T8ORST
Count mode
selection T8ORMD
Interrupt enable
T8OIE
8-bit OSC1 timerOSC
OSC1 oscillator/
division circuit
Gate
Division ratio selection
Figure 14.1.1: 8-bit OSC1 timer configuration
The 8-bit OSC1 timer includes an 8-bit up-counter (T8OSC1_CNT register) and 8-bit compare data register
(T8OSC1_CMP register).
The 8-bit counter can be reset to 0 by software and counts up using the OSC1 division clock (OSC1-1/1 to
OSC1-1/32). The count value can be read by software.
The compare data register contains the data for comparisons against the up counter contents. The comparator out-
puts a signal to control interrupts if the counter value matches the contents of the compare data register. This means
the compare data register can be used to program the interrupt occurrence cycle.
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14.2 8-bit OSC1 Timer Count Mode
The 8-bit OSC1 timer features two count modes: Repeat mode and One-shot mode. These modes are selected using
the T8ORMD bit (D1/T8OSC1_CT register).
* T8ORMD: Count Mode Select Bit in the 8-bit OSC1 Timer Control (T8OSC1_CTL) Register (D1/0x50c0)
Repeat mode (T8ORMD = 0, default)
Setting T8ORMD to 0 sets the 8-bit OSC1 timer to Repeat mode.
In this mode, once the count starts, the 8-bit OSC1 timer continues running until stopped by the application
program. If the counter matches the compare data, the timer resets the counter and continues counting. Since
the interrupt signsl is output at the same time, the 8-bit OSC1 timer should be set to this mode to generate
periodic interrupts at desired intervals.
One-shot mode (T8ORMD = 1)
Setting T8ORMD to 1 sets the 8-bit OSC1 timer to One-shot mode.
In this mode, the 8-bit OSC1 timer stops automatically as soon as the counter matches the compare data.
This means only one interrupt can be generated after the timer starts. Note that the timer resets the counter, then
stops after a complete match has occurred. The 8-bit OSC1 timer should be set to this mode to set a specific
wait time.
Note: Make sure the 8-bit OSC1 timer count is halted before changing count mode settings.
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14.3 Count Clock
The 8-bit OSC1 timer uses the OSC1 division clock output by the OSC module as the count clock. The OSC mod-
ule generates 6 different clocks by dividing the OSC1 clock into 1/1 to 1/32 divisions. One of these is selected by
T8O1CK[2:0] (D[3:1]/OSC_T8OSC1 register).
* T8O1CK[2:0]: T8OSC1 Clock Division Ratio Select Bits in the T8OSC1 Clock Control (OSC_T8OSC1) Register
(D[3:1]/0x5065)
Table 14.3.1: Count clock selection
T8O1CK[2:0] Division ratio
0x7 to 0x6 Reserved
0x5 OSC1-1/32
0x4 OSC1-1/16
0x3 OSC1-1/8
0x2 OSC1-1/4
0x1 OSC1-1/2
0x0 OSC1-1/1
(Default: 0x0)
The clock feed to the 8-bit OSC1 timer is controlled using T8O1CE (D0/OSC_T8OSC1 register). The T8O1CE
default setting is 0, which stops the clock feed. Setting T8O1CE to 1 sends the clock generated as above to the 8-bit
OSC1 timer. If 8-bit OSC1 timer operation is not required, the clock feed should be stopped to reduce power con-
sumption.
* T8O1CE: T8OSC1 Clock Enable Bit in the T8OSC1 Clock Control (OSC_T8OSC1) Register (D0/0x5065)
Note: Make sure the 8-bit OSC1 timer count is halted before changing count clock settings.
For detailed information on clock control, refer to “7 Oscillator Circuit (OSC).”
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14.4 Resetting 8-bit OSC1 Timer
The 8-bit OSC1 Timer can be reset to 0 by writing 1 to the T8ORS bit (D4/T8OSC1_CTL register).
* T8ORST: Timer Reset Bit in the 8-bit OSC1 Timer Control (T8OSC1_CTL) Register (D4/0x50c0)
Normally, the counter should be reset by writing 1 to this bit before starting the count.
The counter is reset by hardware if the counter matches compare data after the count starts.
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14.5 Compare Data Settings
Compare data is written to T8OCMP[7:0] (D[7:0]/T8OSC1_CMP register).
* T8OCMP[7:0]:
Compare Data Bits in the 8-bit OSC1 Timer Compare Data (T8OSC1_CMP) Register
(D[7:0]/0x50c2)
After initial resetting, the compare data register is set to 0x0.
The timer compares the count data against the compare data register and generates a compare match signal as well
as resets the counter if the values are equal. This compare match signal can generate an interrupt.
The compare match cycle can be calculated as follows:
CMP + 1
Compare match interval = ————— [s]
clk_in
clk_in
Compare match cycle = ————— [Hz]
CMP + 1
CMP: Compare data (T8OSC1_CMP register value)
clk_in: 8-bit OSC1 timer count clock frequency
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14.6 8-bit OSC1 Timer RUN/STOP Control
Set the following items before starting the 8-bit OSC1 timer.
(1) Set the count mode (One-shot or Repeat). See Section 14.2.
(2) Select the operation clock. See Section 14.3.
(3) If using interrupts, set the interrupt level and permit interrupts for the 8-bit OSC1 timer. See Section 14.7.
(4) Reset the timer. See Section 14.4.
(5) Set the compare data. See Section 14.5.
The 8-bit OSC1 timer includes T8ORUN (D0/T8OSC1_CTL register) to control Run/Stop.
* T8ORUN: Timer Run/Stop Control Bit in the 8-bit OSC1 Timer Control (T8OSC1_CTL) Register (D0/0x50c0)
The timer starts counting when T8ORUN is written as 1. Writing 0 to T8ORUN prevents clock input and stops the
count.
This control does not affect the counter data. The counter data is retained even when the count is halted, allowing
resumption of the count from that data.
If T8ORUN and T8ORST are written as 1 simultaneously, the timer starts counting after the reset.
If the counter matches the compare data register setting during counting, a compare match signal is output and a
compare interrupt factor generated.
Likewise, if the counter matches the compare data B register setting, a compare B match signal is output and a
compare B interrupt factor generated. The counter is reset to 0 at the same time.
If interrupts are permitted, an interrupt request is sent to the interrupt controller (ITC).
If One-shot mode is set, the timer stops the count.
If Repeat mode is set, the timer continues to count from 0.
T8ORUN
T8ORST
T8OCMP
Input clock
T8OCNT
Reset Reset &
compare match interrupt
Reset &
compare match interrupt
01234501234501
0x5
T8ORUN
T8ORST
T8OCMP
Input clock
T8OCNT
Reset Reset &
compare match interrupt
012345 0
0x5
One-shot mode
Repeat mode
Figure 14.6.1: Basic counter operation timing
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14.7 8-bit OSC1 Timer Interrupts
The T8OSC1 module outputs an interrupt request to the interrupt controller (ITC) by compare match.
Compare match interrupt
This interrupt request is generated when the counter matches the compare data register setting during counting.
It sets the interrupt flag T8OIF (D0/T8OSC1_IFLG register) within the T8OSC1 module to 1.
* T8OIF: 8-bit OSC1 Timer Interrupt Flag in the 8-bit OSC1 Timer Interrupt Flag (T8OSC1_IFLG) Register
(D0/0x50c4)
To use this interrupt, set T8OIE (D0/T8OSC1_IMSK register) to 1. If T8OIE is set to 0 (default), T8OIE is not
set to 1, and the interrupt request for this factor is not sent to the ITC.
* T8OIE: 8-bit OSC1 Timer Interrupt Enable Bit in the 8-bit OSC1 Timer Interrupt Mask (T8OSC1_IMSK)
Register (D0/0x50c3)
If T8OIF is set to 1, the T8OSC1 module outputs an interrupt request to the ITC. This interrupt request signal
sets the 8-bit OSC1 timer interrupt flag inside the ITC to 1 and generates an interrupt if the ITC and S1C17
core interrupt conditions are satisfied.
The interrupt factor should be cleared with the interrupt processing routine by resetting the T8OSC1 module
T8OIF (to 1) rather than the 8-bit OSC1 timer interrupt flag.
Note: To prevent generating unnecessary interrupts, reset the corresponding T8OIF before permit-
ting compare 8-bit OSC1 interrupts from T8OIE.
8-bit OSC1 timer interrupt ITC register
The 8-bit OSC timer outputs an interrupt signal to the ITC is generated by the settings previously described. To
generate 8-bit OSC timer interrupts, the interrupt level and interrupt permission should be set in the ITC regis-
ter.
The 8-bit OSC timer ITC control bits are shown below.
Interrupt flag inside ITC
* EIFT4: 8-bit OSC1 Timer Interrupt Flag in the Interrupt Flag (ITC_IFLG) Register (D4/0x4300)
Interrupt enable bit inside ITC
* EIEN4: 8-bit OSC1 Timer Interrupt Enable Bit in the Interrupt Enable (ITC_EN) Register (D4/0x4302)
Interrupt level setting bit inside ITC
*
EILV4[2:0]: T8OSC1 Interrupt Level Bits in the External Interrupt Level Setup (ITC_ELV2) Register 2
(D[2:0]/0x430a)
Interrupt trigger mode selection bit inside ITC (Fix at 1)
*
EITG4:
T8OSC1 Interrupt Trigger Mode Select Bit in the External Interrupt Level Setup (ITC_ELV2) Register 2
(D4/0x430a)
EIFT4 is set to 1 when a compare match is generated with interrupt permitted in the T8OSC1 module. If EIEN4
is set to 1 here, the ITC sends an interrupt request to the S1C17 core. To prevent 8-bit OSC timer interrupts, set
the EIEN4 to 0. EIFT4 is set to 1 by the interrupt signal from the T8OSC1 module regardless of the EIEN4 set-
ting (even if it is set to 0).
EILV4[2:0] sets the 8-bit OSC1 timer interrupt level (0 to 7).
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The S1C17 core accepts interrupts when the following conditions are satisfied:
• The interrupt enable bit has been set to 1.
• The PSR (S1C17 core internal processor status register) IE (interrupt enable) bit has been set to 1.
• The 8-bit OSC timer interrupt has been set to a higher interrupt level than that set for the PSR IL (interrupt
level).
• No other interrupt factors having higher precedence (e.g., NMI) are present.
For detailed information on these interrupt control registers and operations when interrupts occur, refer to “6
Interrupt Controller (ITC).”
Note: The following processes must be performed to manage the interrupt factor occurrence state
using the T8OSC1 module interrupt flag.
1. Set the 8-bit OSC timer interrupt trigger mode to level trigger mode.
2. Reset the 8-bit OSC module interrupt flags T8OIF within the interrupt processing routine after
the interrupt occurs (this also resets the ITC interrupt flag).
Interrupt vectors
The 8-bit OSC timer interrupt vector numbers and vector addresses are listed below.
Vector number: 8 (0x08)
Vector address: 0x8020
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14.8 Control Register Details
Table 14.8.1: 8-bit OSC1 timer register list
Address Register name Function
0x50c0 T8OSC1_CTL 8-bit OSC1 Timer Control Register Timer mode setting and timer RUN/STOP
0x50c1 T8OSC1_CNT 8-bit OSC1 Timer Counter Data Register Counter data
0x50c2 T8OSC1_CMP 8-bit OSC1 Timer Compare Data Register Compare data setting
0x50c3 T8OSC1_IMSK 8-bit OSC1 Timer Interrupt Mask Register Interrupt mask setting
0x50c4 T8OSC1_IFLG 8-bit OSC1 Timer Interrupt Flag Register Interrupt occurrence status display/resetting
The 8-bit OSC1 timer registers are described in detail below. These are 8-bit registers.
Note: When data is written to the registers, the “Reserved” bits must always be written as 0 and not 1.
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0x50c0: 8-bit OSC1 Timer Control Register (T8OSC1_CTL)
Register name Address Bit Name Function Setting Init. R/W Remarks
8-bit OSC1
Timer Control
Register
(T8OSC1_CTL)
0x50c0
(8 bits)
D7–5 –reserved – – – 0 when being read.
D4 T8ORST Timer reset 1 Reset 0 Ignored 0 W
D3–2 –reserved – – –
D1 T8ORMD Count mode select 1 One shot 0 Repeat 0 R/W
D0 T8ORUN Timer run/stop control 1 Run 0 Stop 0 R/W
D[7:5] Reserved
D4 T8ORST: Timer Reset Bit
Resets the 8-bit OSC1 timer.
1 (W): Reset
0 (W): Disabled
0 (R): Normally 0 when read out (default)
Writing 1 to this bit resets the counter to 0.
D[3:2] Reserved
D1 T8ORMD: Count Mode Select Bit
Selects the 8-bit OSC1 timer count mode.
1 (R/W): One-shot mode
0 (R/W): Repeat mode (default)
Setting T8ORMD to 0 sets the 8-bit OSC1 timer to Repeat mode. In this mode, once the count starts,
the 8-bit timer continues to run until stopped by the application. If the counter matches the compare
data register value, the timer resets the counter and continues counting. This means the timer periodi-
cally outputs a compare match signal. Set the 8-bit OSC1 timer to this mode to generate periodic inter-
rupts at the desired interval.
Setting T8ORMD to 1 sets the 8-bit OSC1 timer to One-shot mode. In this mode, the 8-bit OSC1 timer
stops automatically when the counter matches the compare data register value. This means an interrupt
can be generated only once after the timer has been started. Note that the timer resets the counter and
then stops after a compare match has occurred. Set the 8-bit OSC1 timer to this mode to create a spe-
cific wait time.
Note: Set the count mode only while the 8-bit OSC1 timer count is stopped.
D0 T8ORUN: Timer Run/Stop Control Bit
Controls the timer RUN/STOP.
1 (R/W): Run
0 (R/W): Stop (default)
The timer starts counting when T8ORUN is written as 1 and stops when written as 0. When the timer is
stopped, the counter data is retained until reset or until the next RUN state.
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0x50c1: 8-bit OSC1 Timer Counter Data Register (T8OSC1_CNT)
Register name Address Bit Name Function Setting Init. R/W Remarks
8-bit OSC1
Timer Counter
Data Register
(T8OSC1_CNT)
0x50c1
(8 bits)
D7–0
T8OCNT[7:0]
Timer counter data
T8OCNT7 = MSB
T8OCNT0 = LSB
0x0 to 0xff 0xff R
D[7:0] T8OCNT[7:0]: Counter Data
Reads out the counter data. (Default: 0xff)
This register is read-only and cannot be written to.
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0x50c2: 8-bit OSC1 Timer Compare Data Register (T8OSC1_CMP)
Register name Address Bit Name Function Setting Init. R/W Remarks
8-bit OSC1
Timer Compare
Data Register
(T8OSC1_CMP)
0x50c2
(8 bits)
D7–0
T8OCMP[7:0]
Compare data
T8OCMP7 = MSB
T8OCMP0 = LSB
0x0 to 0xff 0x0 R/W
D[7:0] T8OCMP[7:0]: Compare Data
Sets the 8-bit OSC1 timer compare data. (Default: 0x0)
The data set is compared against the counter data, and a compare match interrupt factor is generated if
the contents match. And the counter is reset to 0.
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0x50c3: 8-bit OSC1 Timer Interrupt Mask Register (T8OSC1_IMSK)
Register name Address Bit Name Function Setting Init. R/W Remarks
8-bit OSC1
Timer Interrupt
Mask Register
(T8OSC1_IMSK)
0x50c3
(8 bits)
D7–1 –reserved – – – 0 when being read.
D0 T8OIE 8-bit OSC1 timer interrupt enable 1 Enable 0 Disable 0 R/W
D[7:1] Reserved
D0 T8OIE: 8-bit OSC1 Timer Interrupt Enable Bit
Permits or prohibits compare match interrupts.
1 (R/W): Interrupt permitted
0 (R/W): Interrupt prohibited (default)
Setting T8OIE to 1 permits 8-bit OSC1 timer interrupt requests to the ITC. Setting it to 0 prohibits in-
terrupts.
The ITC 8-bit OSC1 timer interrupt enable bits must also be set to permit interrupts in order to generate
interrupts.
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0x50c4: 8-bit OSC1 Timer Interrupt Flag Register (T8OSC1_IFLG)
Register name Address Bit Name Function Setting Init. R/W Remarks
8-bit OSC1
Timer Interrupt
Flag Register
(T8OSC1_IFLG)
0x50c4
(8 bits)
D7–1 –reserved – – – 0 when being read.
D0 T8OIF 8-bit OSC1 timer interrupt flag 1 Cause of
interrupt
occurred
0 Cause of
interrupt not
occurred
0 R/W Reset by writing 1.
D[7:1] Reserved
D0 T8OIF: 8-bit OSC1 Timer Interrupt Flag
Interrupt flag indicating the compare match interrupt factor occurrence status.
1(R): Interrupt factor present
0(R): No interrupt factor (default)
1(W): Reset flag
0(W): Disabled
T8OIF is the T8OSC1 module interrupt flag. Setting T8OIE (D0/T8OSC1_IMSK register) to 1 sets this
to 1 when the counter matches the compare data register setting during counting. An 8-bit OSC1 timer
interrupt request signal output simultaneously to the ITC sets the ITC 8-bit OSC1 timer interrupt flag to
1 and generates an interrupt if the ITC and S1C17 core interrupt conditions are met.
The following processes must be performed to manage the interrupt factor occurrence state using this
register.
1. Set the ITC 8-bit OSC1 timer interrupt trigger mode to level trigger mode.
2. Reset the T8OSC1 module interrupt flag T8OIF within the interrupt processing routine after the in-
terrupt occurs (this also resets the ITC interrupt flag).
T8OIF is reset by writing as 1.
Note: To prevent generating unnecessary interrupts, reset T8OIF before permitting compare
match interrupts using T8OIE (D0/T8OSC1_IMSK register).
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14.9 Precautions
• The 8-bit OSC1 timer clock must be output from the OSC module before the 8-bit OSC1 timer begins running.
• Set the count clock and count mode only while the 8-bit OSC1 timer count is stopped.
• To prevent generating unnecessary interrupts, reset T8OIF (D0/T8OSC1_IFLG register) before permitting com-
pare match interrupts using T8OIE (D0/T8OSC1_IMSK register).
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15 Clock Timer (CT)
15.1 Clock Timer Overview
The S1C17001 incorporates a single-channel clock timer that uses the OSC1 clock as its oscillation source.
The clock timer consists of an 8-bit binary counter that uses the 256 Hz signal divided from the OSC1 clock as the
input clock and allows data for each bit (128 Hz to 1 Hz) to be read out by software.
The clock timer can also generate interrupts using the 32 Hz, 8 Hz, 2 Hz, and 1 Hz signals.
This clock timer is normally used for various timing functions, such as clocks.
Figure 15.1.1 illustrates the clock timer configuration.
256Hz
Internal data bus
Clock timer interrupt request
To ITC
128
Hz
64
Hz
32
Hz
16
Hz
8
Hz
4
Hz
2
Hz
1
Hz
Count
control
circuit
Interrupt
control
circuit
RUN/STOP
control
Interrupt enable
CTRUN
CTIE32
CTIE8
CTIE2
CTIE1
Timer reset CTRST
CT_CNT
D0 D1 D2 D3 D4 D5 D6 D7
Clock timerOSC
OSC1 oscillator/
division circuit
Figure 15.1.1: Clock timer configuration
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15.2 Operation Clock
The clock timer uses the 256 Hz clock output by the OSC module as the operation clock.
The OSC module generates this operation clock by dividing the OSC1 clock into 1/128, resulting in a frequency of
256 Hz when the OSC1 clock frequency is 32.768 kHz. The frequency described in this section will vary accord-
ingly for other OSC1 clock frequencies.
The OSC module does not include a 256 Hz clock output control bit. The 256 Hz clock is normally fed to the clock
timer when the OSC1 oscillation is on.
For detailed information on OSC1 oscillator circuit control, refer to “7 Oscillator Circuit (OSC).”
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15.3 Clock Timer Resetting
Reset the clock timer by writing 1 to the CTRST bit (D4/CT_CTL register). This clears the counter to 0.
* CTRST: Clock Timer Reset Bit in the Clock Timer Control (CT_CTL) Register (D4/0x5000)
Apart from this operation, the counter is also cleared by initial resetting.
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15.4 Clock Timer RUN/STOP Control
Set the following items before starting the clock timer.
(1) If using interrupts, set the interrupt level and permit interrupts for the clock timer. See Section 15.5.
(2) Reset the timer. See Section 15.3.
The clock timer includes CTRUN (D0/CT_CTL register) to control Run/Stop.
* CTRUN: Clock Timer Run/Stop Control Bit in the Clock Timer Control (CT_CTL) Register (D0/0x5000)
The clock timer starts operating when CTRUN is written as 1. Writing 0 to CTRUN prevents clock input and stops
the operation.
This control does not affect the counter (CT_CNT register) data. The counter data is retained even when the count
is halted, allowing resumption of the count from that data.
If CTRUN and CTRST are written as 1 simultaneously, the clock timer starts counting after the reset.
Interrupt factors are generated during counting at the corresponding 32 Hz, 8 Hz, 2 Hz, and 1 Hz signal falling
edges. If interrupts are permitted, interrupt requests are sent to the interrupt controller (ITC).
256Hz
128Hz
64Hz
32Hz
16Hz
8Hz
4Hz
2Hz
1Hz
32 Hz interrupt
8 Hz interrupt
2 Hz interrupt
1 Hz interrupt
OSC1-1/128
CTCNT0
CTCNT1
CTCNT2
CTCNT3
CTCNT4
CTCNT5
CTCNT6
CTCNT7
Figure 15.4.1: Clock timer timing chart
Note: The clock timer switches to Run/Stop mode when data is written to CTRUN synchronized
with the 256 Hz signal falling edge. When 0 is written to CTRUN, the timer switches to Stop
state after counting an additional “+1.” 1 is retained for CTRUN reading until the timer actually
stops.
Figure 15.4.2 shows the Run/Stop control timing chart.
CTRUN(WR)
CT_CNT register 0x57 0x58 0x59 0x5a 0x5b 0x5c
CTRUN(RD)
256Hz
Figure 15.4.2: Run/Stop control timing chart
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15.5 Clock Timer Interrupts
The CT module includes functions for generating the following four kinds of interrupts:
32 Hz, 8 Hz, 2 Hz, 1 Hz interrupts
The CT module outputs a single interrupt signal shared by the above four interrupt factors to the interrupt controller
(ITC). The interrupt flag within the CT module should be read to identify the interrupt factor that occurred.
32 Hz, 8 Hz, 2 Hz, 1 Hz interrupts
Generated at the 32 Hz, 8 Hz, 2 Hz, and 1 Hz signal falling edges, these interrupt requests set the following in-
terrupt flags in the CT module to 1.
* CTIF32: 32 Hz Interrupt Flag in the Clock Timer Interrupt Flag (CT_IFLG) Register (D3/0x5003)
* CTIF8: 8 Hz Interrupt Flag in the Clock Timer Interrupt Flag (CT_IFLG) Register (D2/0x5003)
* CTIF2: 2 Hz Interrupt Flag in the Clock Timer Interrupt Flag (CT_IFLG) Register (D1/0x5003)
* CTIF1: 1 Hz Interrupt Flag in the Clock Timer Interrupt Flag (CT_IFLG) Register (D0/0x5003)
To use these interrupts, set the following interrupt enable bits to 1 for the corresponding interrupt flags. If the
interrupt enable bits are set to 0 (default), the interrupt flag will not be set to 1, and the interrupt requests for
this factor will not be sent to the ITC.
* CTIE32: 32 Hz Interrupt Enable Bit in the Clock Timer Interrupt Mask (CT_IMSK) Register (D3/0x5002)
* CTIE8: 8 Hz Interrupt Enable Bit in the Clock Timer Interrupt Mask (CT_IMSK) Register (D2/0x5002)
* CTIE2: 2 Hz Interrupt Enable Bit in the Clock Timer Interrupt Mask (CT_IMSK) Register (D1/0x5002)
* CTIE1: 1 Hz Interrupt Enable Bit in the Clock Timer Interrupt Mask (CT_IMSK) Register (D0/0x5002)
The CT module outputs an interrupt request to the ITC if the CTIF* is set to 1. This interrupt request signal sets
the clock timer interrupt flag inside the ITC to 1 and generates an interrupt if the ITC and S1C17 core interrupt
conditions are met.
Check the frequency of a clock timer interrupt by reading CTIF* as part of the clock timer interrupt processing
routine.
The interrupt factor should be cleared with the interrupt processing routine by resetting the CT module CTIF* (to
1) rather than the clock timer interrupt flag.
Note: To prevent generating unnecessary interrupts, reset the corresponding CTIF* before permitting
clock timer interrupts from CTIE*.
Clock timer interrupt ITC register
The clock timer outputs an interrupt signal to the ITC using the falling edge for the frequency for which inter-
rupts are permitted in the settings previously described. To generate clock timer interrupts, the interrupt level
and interrupt permission should be set in the ITC register.
The clock timer ITC control bits are shown below.
Interrupt flag inside ITC
* EIFT3: Clock Timer Interrupt Flag in the Interrupt Flag (ITC_IFLG) Register (D3/0x4300)
Interrupt enable bit inside ITC
* EIEN3: Clock Timer Interrupt Enable Bit in the Interrupt Enable (ITC_EN) Register (D3/0x4302)
Interrupt level setting bit inside ITC
*
EILV3[2:0]: CT Interrupt Level Bits in the External Interrupt Level Setup (ITC_ELV1) Register 1
(D[10:8]/0x4308)
Interrupt trigger mode selection bit inside ITC (Fix at 1)
*
EITG3: CT Interrupt Trigger Mode Select Bit in the External Interrupt Level Setup (ITC_ELV1) Register 1
(D12/0x4308)
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EIFT3 is set to 1 at the falling edge of the 32/8/2/1 Hz signals for which interrupts are permitted by the CT
module. If EIEN3 is set to 1 here, the ITC sends an interrupt request to the S1C17 core. To prevent clock timer
interrupts, set the EIEN3 to 0. EIFT3 is set to 1 by the interrupt signal from the CT module regardless of the
EIEN3 setting (even if it is set to 0).
EILV3[2:0] sets the clock timer interrupt level (0 to 7).
The S1C17 core accepts interrupts when the following conditions are satisfied:
• The interrupt enable bit has been set to 1.
• The PSR (S1C17 core internal processor status register) IE (interrupt enable) bit has been set to 1.
• The clock timer interrupt has been set to a higher interrupt level than that set for the PSR IL (interrupt level).
• No other interrupt factors having higher precedence (e.g., NMI) are present.
For detailed information on these interrupt control registers and operations when interrupts occur, refer to “6
Interrupt Controller (ITC).”
Note: The following processes must be performed to manage the interrupt factor occurrence state
using the CT module interrupt flag.
1. Set the clock timer interrupt trigger mode to level trigger mode.
2. Reset the CT module interrupt flags CTIF* within the interrupt processing routine after the in-
terrupt occurs (this also resets the ITC interrupt flag).
Interrupt vectors
The clock timer interrupt vector numbers and vector addresses are listed below.
Vector number: 7 (0x07)
Vector address: 0x801c
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15.6 Control Register Details
Table 15.6.1: Clock timer registers list
Address Register name Function
0x5000 CT_CTL Clock Timer Control Register Timer resetting and Run/Stop control
0x5001 CT_CNT Clock Timer Counter Register Counter data
0x5002 CT_IMSK Clock Timer Interrupt Mask Register Interrupt mask setting
0x5003 CT_IFLG Clock Timer Interrupt Flag Register Interrupt occurrence status display/resetting
The clock timer registers are described in detail below. These are 8-bit registers.
Note: When data is written to the registers, the “Reserved” bits must always be written as 0 and not 1.
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0x5000: Clock Timer Control Register (CT_CTL)
Register name Address Bit Name Function Setting Init. R/W Remarks
Clock Timer
Control Register
(CT_CTL)
0x5000
(8 bits)
D7–5 –reserved – – – 0 when being read.
D4 CTRST Clock timer reset 1 Reset 0 Ignored 0 W
D3–1 –reserved – – –
D0 CTRUN Clock timer run/stop control 1 Run 0 Stop 0 R/W
D[7:5] Reserved
D4 CTRST: Clock Timer Reset Bit
Resets the clock timer.
1 (W): Reset
0 (W): Disabled
0 (R): Normally 0 when read out (default)
Writing 1 to this bit resets the counter to 0x0. When reset in Run state, the clock timer restarts immedi-
ately after resetting. The reset data 0x0 is retained when in Stop state.
D[3:1] Reserved
D0 CTRUN: Clock Timer Run/Stop Control Bit
Controls the clock timer Run/Stop.
1 (R/W): Run
0 (R/W): Stop (default)
The clock timer starts counting when CTRUN is written as 1 and stops when written as 0. The counter
data is retained at Stop state until a reset or the next Run state.
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0x5001: Clock Timer Counter Register (CT_CNT)
Register name Address Bit Name Function Setting Init. R/W Remarks
Clock Timer
Counter Regis-
ter
(CT_CNT)
0x5001
(8 bits)
D7–0 CTCNT[7:0] Clock timer counter value 0x0 to 0xff 0 R
D[7:0] CTCNT[7:0]: Clock Timer Counter Value
Reads out the counter data. (Default: 0xff)
This register is read-only and cannot be written to.
The bits correspond to various frequencies, as follows:
D7: 1Hz
D6: 2Hz
D5: 4Hz
D4: 8Hz
D3: 16Hz
D2: 32Hz
D1: 64Hz
D0: 128Hz
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0x5002: Clock Timer Interrupt Mask Register (CT_IMSK)
Register name Address Bit Name Function Setting Init. R/W Remarks
Clock Timer
Interrupt Mask
Register
(CT_IMSK)
0x5002
(8 bits)
D7–4 –reserved – – – 0 when being read.
D3 CTIE32 32 Hz interrupt enable 1 Enable 0 Disable 0 R/W
D2 CTIE8 8 Hz interrupt enable 1 Enable 0 Disable 0 R/W
D1 CTIE2 2 Hz interrupt enable 1 Enable 0 Disable 0 R/W
D0 CTIE1 1 Hz interrupt enable 1 Enable 0 Disable 0 R/W
This register permits or prohibits interrupt requests individually for the clock timer 32 Hz, 8 Hz, 2 Hz, and 1 Hz
signals. Setting the CTIE*bit to 1 permits clock timer interrupts for the corresponding frequency signal falling
edge, while setting to 0 prohibits interrupts.
To enable interrupt generation, the ITC clock timer interrupt enable bits must also be set to permit interrupts.
D[7:4] Reserved
D3 CTIE32: 32 Hz Interrupt Enable Bit
Permits or prohibits 32 Hz signal interrupts.
1 (R/W): Interrupt permitted
0 (R/W): Interrupt prohibited (default)
D2 CTIE8: 8 Hz Interrupt Enable Bit
Permits or prohibits 8 Hz signal interrupts.
1 (R/W): Interrupt permitted
0 (R/W): Interrupt prohibited (default)
D1 CTIE2: 2 Hz Interrupt Enable Bit
Permits or prohibits 2 Hz signal interrupts.
1 (R/W): Interrupt permitted
0 (R/W): Interrupt prohibited (default)
D0 CTIE1: 1 Hz Interrupt Enable Bit
Permits or prohibits 1 Hz signal interrupts.
1 (R/W): Interrupt permitted
0 (R/W): Interrupt prohibited (default)
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0x5003: Clock Timer Interrupt Flag Register (CT_IFLG)
Register name Address Bit Name Function Setting Init. R/W Remarks
Clock Timer
Interrupt Flag
Register
(CT_IFLG)
0x5003
(8 bits)
D7–4 –reserved – – – 0 when being read.
D3 CTIF32 32 Hz interrupt flag 1 Cause of
interrupt
occurred
0 Cause of
interrupt not
occurred
0 R/W Reset by writing 1.
D2 CTIF8 8 Hz interrupt flag 0 R/W
D1 CTIF2 2 Hz interrupt flag 0 R/W
D0 CTIF1 1 Hz interrupt flag 0 R/W
This register indicates the occurrence state of interrupt factors due to clock timer 32 Hz, 8 Hz, 2 Hz, and 1 Hz sig-
nals. If a clock timer interrupt occurs, identify the interrupt factor (frequency) by reading the interrupt flag in this
register. CTIF* are CT module interrupt flags corresponding to the individual 32 Hz, 8 Hz, 2 Hz, and 1 Hz inter-
rupts. It is set to 1 at the falling edge of each signal if CTIE* (CT_IMSK register) is set to 1. The clock timer inter-
rupt request signal is output to the ITC at the same time. This interrupt request signal sets the clock timer interrupt
flag in the ITC to 1 and generates an interrupt if the ITC and S1C17 core interrupt conditions are met.
The following processes must be performed to manage the interrupt factor occurrence state using this register.
1. Set the ITC clock timer interrupt trigger mode to level trigger mode.
2. Reset the CT module interrupt flag within the interrupt processing routine after the interrupt occurs (this also re-
sets the ITC interrupt flag).
CTIF* is reset by writing as 1.
Note: To prevent generating unnecessary interrupts, CTIF* must be reset before permitting clock
timer interrupts using CTIE.*
D3 CTIF32: 32 Hz Interrupt Flag
Interrupt flag indicating the 32 Hz interrupt factor occurrence status.
1(R): Interrupt factor present
0(R): No interrupt factor (default)
1(W): Reset flag
0(W): Disabled
Setting CTIE32 (D3/CT_IMSK register) to 1 sets CTIF32 to 1 at the 32 Hz signal falling edge.
D2 CTIF8: 8 Hz Interrupt Flag
Interrupt flag indicating the 8 Hz interrupt factor occurrence status.
1(R): Interrupt factor present
0(R): No interrupt factor (default)
1(W): Reset flag
0(W): Disabled
Setting CTIE8 (D2/CT_IMSK register) to 1 sets CTIF8 to 1 at the 8 Hz signal falling edge.
D1 CTIF2: 2 Hz Interrupt Flag
Interrupt flag indicating the 2 Hz interrupt factor occurrence status.
1(R): Interrupt factor present
0(R): No interrupt factor (default)
1(W): Reset flag
0(W): Disabled
Setting CTIE2 (D1/CT_IMSK register) to 1 sets CTIF2 to 1 at the 2 Hz signal falling edge.
D0 CTIF1: 1 Hz Interrupt Flag
Interrupt flag indicating the 1 Hz interrupt factor occurrence status.
1(R): Interrupt factor present
0(R): No interrupt factor (default)
1(W): Reset flag
0(W): Disabled
Setting CTIE1 (D0/CT_IMSK register) to 1 sets CTIF1 to 1 at the 1 Hz signal falling edge.
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15.7 Precautions
• The OSC1 oscillator circuit must be set to On before operating the clock timer.
• To prevent generating unnecessary interrupts, reset the CT_IFLG register interrupt flag before permitting clock
timer interrupts by the CT_IMSK register.
• The clock timer switches to Run/Stop mode when data is written to CTRUN synchronized with the 256 Hz signal
falling edge. When 0 is written to CTRUN (D0/CT_CTL register), the timer switches to Stop state after counting
an additional “+1.” 1 is retained for CTRUN reading until the timer actually stops.
Figure 15.7.1 shows the Run/Stop control timing chart.
CTRUN(WR)
CT_CNT register 0x57 0x58 0x59 0x5a 0x5b 0x5c
CTRUN(RD)
256Hz
Figure 15.7.1: Run/Stop control timing chart
• Executing the slp command will destabilize a running clock timer (CTRUN = 1) during recovery from SLEEP
state. When switching to SLEEP state, set the clock timer to STOP (CTRUN = 0) before executing the slp com-
mand.
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16StopwatchTimer(SWT)
16.1 Stopwatch Timer Overview
The S1C17001 incorporates a 1/100-second and 1/10-second stopwatch timer. The stopwatch timer consists of a
4-bit 2-stage BCD counter (1/100 and 1/10 second) that uses the 256 Hz signal divided from the OSC1 clock as the
input clock and allows count data to be read out by software.
The stopwatch timer can also generate interrupts using the 100 Hz (approximately 100 Hz), 10 Hz (approximately
10 Hz), and 1 Hz signals.
Figure 16.1.1 illustrates the stopwatch timer configuration.
256Hz
Internal data bus
Interrupt request
To ITC
Feedback
division
circuit
1/100-second
4-bit BCD counter
1/10-second
4-bit BCD counter
Count
control
circuit
Interrupt
control
circuit
SWTRUN
SIE100
SIE10
SIE1
Reset SWTRST
Stopwatch timerOSC
OSC1 oscillator/
division circuit
Approximate 100 Hz
Approximate 10 Hz
1Hz
RUN/STOP
control
Interrupt enable
Figure 16.1.1: Stopwatch timer configuration
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16.2 BCD Counters
The stopwatch counter consists of 1/100-second and 1/10-second 4-bit BCD counters.
The count value can be read from the SWT_BCNT register.
1/100-second counter
* BCD100[3:0]: 1/100 Sec. BCD Counter Value in the Stopwatch Timer BCD Counter (SWT_BCNT) Register
(D[3:0]/0x5021)
1/10-second counter
* BCD10[3:0]: 1/10 Sec. BCD Counter Value in the Stopwatch Timer BCD Counter (SWT_BCNT) Register
(D[7:4]/0x5021)
Count-up Pattern
A feedback division circuit is used to generate 100 Hz, 10 Hz, and 1 Hz signals from the 256 Hz clock. The
counter count-up pattern varies as shown in Figure 16.2.1.
3
256
2
256
3
256
2
256
3
256
2
256
3
256
2
256
3
256
2
256
1/100-second counter count-up pattern 1
256Hz
Approximate 100 Hz
(Feedback division circuit output)
1/100-second counter
Approximate 10 Hz
(1/100-second counter output)
Approximate 10 Hz
(1/100-second counter output)
1/10-second counter
1Hz
(1/10-second counter output)
25
256
1/100-second counter count-up pattern 2
seconds
26
256 × 6 + 25
256 × 4 = 1
second
26
256 seconds 26
256 seconds 25
256 seconds 25
256 seconds 26
256 seconds 26
256 seconds 25
256 seconds 25
256 seconds 26
256 seconds 26
256 seconds
seconds
26
256
3
256
3
256
3
256
2
256
3
256
2
256
3
256
2
256
3
256
2
256
0 1 2 3 4 5 6 7 8 9
0123456789
0 1 2 3 4 5 6 7 8 9
1/10-second counter count-up pattern
Figure 16.2.1: Stopwatch timer count-up patterns
The feedback division circuit generates an approximate 100 Hz signal at 2/256-second and 3/256-second inter-
vals from the 256 Hz signal fed from the OSC module.
The 1/100-second counter counts the approximate 100 Hz signal output by the feedback division circuit and
generates an approximate 10 Hz signal at 25/256-second and 26/256-second intervals.
Count-up will be pseudo 1/100-second counting at 2/256-second and 3/256-second intervals.
The 1/10-second counter counts the approximate 10 Hz signal generated by the 1/100-second counter at a ratio
of 4:6, and generates a 1 Hz signal.
Count-up will be pseudo 1/10-second counting at 25/256-second and 26/256-second intervals.
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16.3 Operation Clock
The stopwatch timer uses the 256 Hz clock output by the OSC module as the operation clock.
The OSC module generates this operation clock by dividing the OSC1 clock into 1/128, resulting in a frequency of
256 Hz when the OSC1 clock frequency is 32.768 kHz. The frequency described in this section will vary accord-
ingly for other OSC1 clock frequencies.
The OSC module does not include a 256 Hz clock output control bit. The 256 Hz clock is normally fed to the stop-
watch timer when the OSC1 oscillation is on.
For detailed information on OSC1 oscillator circuit control, refer to “7 Oscillator Circuit (OSC).”
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16.4 Stopwatch Timer Resetting
Reset the stopwatch timer by writing 1 to the SWTRST bit (D4/SWT_CTL register). This clears the counter to 0.
* SWTRST: Stopwatch Timer Reset Bit in the Stopwatch Timer Control (SWT_CTL) Register (D4/0x5020)
Apart from this operation, the counter is also cleared by initial resetting.
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16.5 Stopwatch Timer RUN/STOP Control
Set the following items before starting the stopwatch timer.
(1) If using interrupts, set the interrupt level and permit interrupts for the stopwatch timer. See Section 16.6.
(2) Reset the timer. See Section 16.4.
The stopwatch timer includes SWTRUN (D0/SWT_CTL register) to control Run/Stop.
*
SWTRUN: Stopwatch Timer Run/Stop Control Bit in the Stopwatch Timer Control (SWT_CTL) Register (D0/0x5020)
The stopwatch timer starts counting when SWTRUN is written as 1. Writing 0 to SWTRUN prevents clock input
and stops the count.
This control does not affect the counter (SWT_BCNT register) data. The counter data is retained even when the
count is halted, allowing resumption of the count from that data.
If SWTRUN and SWTRST are written as 1 simultaneously, the stopwatch timer starts counting after the reset.
Interrupt factors are generated during counting at the corresponding 100 Hz (approximate 100 Hz), 10 Hz (approxi-
mate 10 Hz), and 1 Hz signal falling edges. If interrupts are permitted, interrupt requests are sent to the interrupt
controller (ITC).
BCD100[0]
BCD100[1]
BCD100[2]
BCD100[3]
100 Hz interrupt
10 Hz interrupt
1/100-
second
counter
BCD data
1/10-
second
counter
BCD data
BCD10[0]
BCD10[1]
BCD10[2]
BCD10[3]
1 Hz interrupt
123456789012345678901234
0
Figure 16.5.1: Stopwatch timer timing chart
Note: The stopwatch timer switches to Run/Stop mode when data is written to SWTRUN synchro-
nized with the 256 Hz signal falling edge. When 0 is written to SWTRUN, the timer switches to
Stop state after counting an additional “+1.” 1 is retained for SWTRUN reading until the timer
actually stops.
Figure 16.5.2 shows the Run/Stop control timing chart.
SWTRUN(WR)
SWT_BCNT register 27 28 29 30 31 32
SWTRUN(RD)
256Hz
Figure 16.5.2: Run/Stop control timing chart
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16.6 Stopwatch Timer Interrupts
The SWT module includes functions for generating the following three kinds of interrupts:
• 100 Hz interrupt
• 10 Hz interrupt
• 1 Hz interrupt
The SWT module outputs a single interrupt signal shared by the above three interrupt factors to the interrupt con-
troller (ITC). The interrupt flag within the SWT module should be read to identify the interrupt factor that occurred.
100 Hz, 10 Hz, 1 Hz interrupts
Generated at the 100 Hz (approximate 100 Hz), 10 Hz (approximate 10 Hz), and 1 Hz signal falling edges,
these interrupt requests set the following interrupt flags in the SWT module to 1.
* SIF1: 1 Hz Interrupt Flag in the Stopwatch Timer Interrupt Flag (SWT_IFLG) Register (D2/0x5023)
* SIF10: 10 Hz Interrupt Flag in the Stopwatch Timer Interrupt Flag (SWT_IFLG) Register (D1/0x5023)
* SIF100: 100 Hz Interrupt Flag in the Stopwatch Timer Interrupt Flag (SWT_IFLG) Register (D0/0x5023)
To use these interrupts, set the following interrupt enable bits to 1 for the corresponding interrupt flags. If the
interrupt enable bits are set to 0 (default), the interrupt flag will not be set to 1, and the interrupt requests for
this factor will not be sent to the ITC.
* SIE1: 1 Hz Interrupt Enable Bit in the Stopwatch Timer Interrupt Mask (SWT_IMSK) Register (D2/0x5022)
* SIE10: 10 Hz Interrupt Enable Bit in the Stopwatch Timer Interrupt Mask (SWT_IMSK) Register (D1/0x5022)
* SIE100: 100 Hz Interrupt Enable Bit in the Stopwatch Timer Interrupt Mask (SWT_IMSK) Register (D0/0x5022)
The SWT module outputs an interrupt request to the ITC if the SIF* is set to 1. This interrupt request signal
sets the stopwatch timer interrupt flag inside the ITC to 1 and generates an interrupt if the ITC and S1C17 core
interrupt conditions are met.
Check the frequency of a stopwatch timer interrupt by reading SIF* as part of the stopwatch timer interrupt
processing routine.
The interrupt factor should be cleared with the interrupt processing routine by resetting the SWT module SIF* (to
1) rather than the ITC stopwatch timer interrupt flag.
Note: To prevent generating unnecessary interrupts, reset the corresponding SIF* before permitting
stopwatch timer interrupt from SIE*.
Stopwatch timer interrupt ITC register
The stopwatch timer outputs an interrupt signal to the ITC using the falling edge for the frequency for which
interrupts are permitted in the settings previously described. To generate stopwatch timer interrupts, the inter-
rupt level and interrupt permission should be set in the ITC register.
The stopwatch timer ITC control bits are shown below.
Interrupt flag inside ITC
* EIFT2: Stopwatch Timer Interrupt Flag in the Interrupt Flag (ITC_IFLG) Register (D2/0x4300)
Interrupt enable bit inside ITC
* EIEN2: Stopwatch Timer Interrupt Enable Bit in the Interrupt Enable (ITC_EN) Register (D2/0x4302)
Interrupt level setting bit inside ITC
*
EILV2[2:0]: SWT Interrupt Level Bits in the External Interrupt Level Setup (ITC_ELV1) Register 1
(D[2:0]/0x4308)
Interrupt trigger mode selection bit inside ITC (Fix at 1)
*
EITG2: SWT Interrupt Trigger Mode Select Bit in the External Interrupt Level Setup (ITC_ELV1) Register 1
(D4/0x4308)
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EIFT2 is set to 1 at the falling edge of the 100/10/1 Hz signals for which interrupts are permitted by the SWT
module. If EIEN2 is set to 1 here, the ITC sends an interrupt request to the S1C17 core. To prevent stopwatch
timer interrupts, set the EIEN2 to 0. EIFT2 is set to 1 by the interrupt signal from the SWT module regardless
of the EIEN2 setting (even if it is set to 0).
EILV2[2:0] sets the stopwatch timer interrupt level (0 to 7).
The S1C17 core accepts interrupts when the following conditions are satisfied:
• The interrupt enable bit has been set to 1.
• The PSR (S1C17 core internal processor status register) IE (interrupt enable) bit has been set to 1.
• The stopwatch timer interrupt has been set to a higher interrupt level than that set for the PSR IL (interrupt
level).
• No other interrupt factors having higher precedence (e.g., NMI) are present.
For detailed information on these interrupt control registers and operations when interrupts occur, refer to “6
Interrupt Controller (ITC).”
Note: The following processes must be performed to manage the interrupt factor occurrence state
using the SWT module interrupt flag.
1. Set the ITC stopwatch timer interrupt trigger mode to level trigger mode.
2. Reset the SWT module interrupt flag SIF* within the interrupt processing routine after the
interrupt occurs (this also resets the ITC interrupt flag).
Interrupt vectors
The stopwatch timer interrupt vector numbers and vector addresses are listed below.
Vector number: 6 (0x06)
Vector address: 0x8018
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16.7 Control Register Details
Table 16.7.1 Stopwatch timer register list
Address Register name Function
0x5020 SWT_CTL Stopwatch Timer Control Register Timer resetting and Run/Stop control
0x5021 SWT_BCNT Stopwatch Timer BCD Counter Register BCD counter data
0x5022 SWT_IMSK Stopwatch Timer Interrupt Mask Register Interrupt mask setting
0x5023 SWT_IFLG Stopwatch Timer Interrupt Flag Register Interrupt occurrence status display/resetting
The stopwatch timer registers are described in detail below. These are 8-bit registers.
Note: When data is written to the registers, the “Reserved” bits must always be written as 0 and not 1.
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0x5020: Stopwatch Timer Control Register (SWT_CTL)
Register name Address Bit Name Function Setting Init. R/W Remarks
Stopwatch
Timer
Control
Register
(SWT_CTL)
0x5020
(8 bits)
D7–5 –reserved – – – 0 when being read.
D4 SWTRST Stopwatch timer reset 1 Reset 0 Ignored 0 W
D3–1 –reserved – – –
D0 SWTRUN Stopwatch timer run/stop control 1 Run 0 Stop 0 R/W
D[7:5] Reserved
D4 SWTRST: Stopwatch Timer Reset Bit
Resets the stopwatch timer.
1 (W): Reset
0 (W): Disabled
0 (R): Normally 0 when read out (default)
Writing 1 to this bit resets the counter to 0x0. When reset in Run state, the stopwatch timer restarts im-
mediately after resetting. The reset data 0x0 is retained when in Stop state.
D[3:1] Reserved
D0 SWTRUN: Stopwatch Timer Run/Stop Control Bit
Controls the stopwatch timer Run/Stop.
1 (R/W): Run
0 (R/W): Stop (default)
The stopwatch timer starts counting when SWTRUN is written as 1 and stops when written as 0. The
counter data is retained at Stop state until a reset or the next Run state.
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0x5021: Stopwatch Timer BCD Counter Register (SWT_BCNT)
Register name Address Bit Name Function Setting Init. R/W Remarks
Stopwatch
Timer BCD
Counter Regis-
ter
(SWT_BCNT)
0x5021
(8 bits)
D7–4
BCD10[3:0] 1/10 sec. BCD counter value 0 to 9 0 R
D3–0
BCD100[3:0]
1/100 sec. BCD counter value 0 to 9 0 R
D[7:4] BCD10[3:0]: 1/10 Sec. BCD Counter Value
Read the 1/10-second counter BCD data. (Default: 0)
This register is read-only and cannot be written to.
D[3:0] BCD100[3:0]: 1/100 Sec. BCD Counter Value
Read the 1/100-second counter BCD data. (Default: 0)
This register is read-only and cannot be written to.
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0x5022: Stopwatch Timer Interrupt Mask Register (SWT_IMSK)
Register name Address Bit Name Function Setting Init. R/W Remarks
Stopwatch
Timer Interrupt
Mask Register
(SWT_IMSK)
0x5022
(8 bits)
D7–3 –reserved – – – 0 when being read.
D2 SIE1 1 Hz interrupt enable 1 Enable 0 Disable 0 R/W
D1 SIE10 10 Hz interrupt enable 1 Enable 0 Disable 0 R/W
D0 SIE100 100 Hz interrupt enable 1 Enable 0 Disable 0 R/W
This register permits or prohibits interrupt requests individually for the stopwatch timer 100 Hz, 10 Hz, and 1 Hz
signals. Setting the SIE*bit to 1 permits stopwatch timer interrupts for the corresponding frequency signal falling
edge, while setting to 0 prohibits interrupts.
To enable interrupt generation, the ITC stopwatch timer interrupt enable bits must also be set to permit interrupts.
D[7:3] Reserved
D2 SIE1: 1 Hz Interrupt Enable Bit
Permits or prohibits 1 Hz signal interrupts.
1 (R/W): Interrupt permitted
0 (R/W): Interrupt prohibited (default)
D1 SIE10: 10 Hz Interrupt Enable Bit
Permits or prohibits 10 Hz signal interrupts.
1 (R/W): Interrupt permitted
0 (R/W): Interrupt prohibited (default)
D0 SIE100: 100 Hz Interrupt Enable Bit
Permits or prohibits 100 Hz signal interrupts.
1 (R/W): Interrupt permitted
0 (R/W): Interrupt prohibited (default)
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0x5023: Stopwatch Timer Interrupt Flag Register (SWT_IFLG)
Register name Address Bit Name Function Setting Init. R/W Remarks
Stopwatch
Timer Interrupt
Flag Register
(SWT_IFLG)
0x5023
(8 bits)
D7–3 –reserved – – – 0 when being read.
D2 SIF1 1 Hz interrupt flag 1 Cause of
interrupt
occurred
0 Cause of
interrupt not
occurred
0 R/W Reset by writing 1.
D1 SIF10 10 Hz interrupt flag 0 R/W
D0 SIF100 100 Hz interrupt flag 0 R/W
This register indicates the occurrence state of interrupt factors due to stopwatch timer 100 Hz, 10 Hz, and 1 Hz sig-
nals. If a stopwatch timer interrupt occurs, identify the interrupt factor (frequency) by reading the interrupt flag in
this register.
SIF* are SWT module interrupt flags corresponding to the individual 100 Hz, 10 Hz, and 1 Hz interrupts. It is set to
1 at the falling edge of each signal if SIE* (SWT_IMSK register) is set to 1. The stopwatch timer interrupt request
signal is output to the ITC at the same time. This interrupt request signal sets the stopwatch timer interrupt flag in
the ITC to 1 and generates an interrupt if the ITC and S1C17 core interrupt conditions are met.
The following processes must be performed to manage the interrupt factor occurrence state using this register.
1. Set the ITC stopwatch timer interrupt trigger mode to level trigger mode.
2. Reset the SWT module interrupt flag within the interrupt processing routine after the interrupt occurs (this also
resets the ITC interrupt flag).
SIF* is reset by writing as 1.
Note: To prevent generating unnecessary interrupts, SIF* must be reset before permitting clock timer
interrupts using SIE.*
D[7:3] Reserved
D2 SIF1: 1 Hz Interrupt Flag
Interrupt flag indicating the 1 Hz interrupt factor occurrence status.
1(R): Interrupt factor present
0(R): No interrupt factor (default)
1(W): Reset flag
0(W): Disabled
Setting SIE1 (D2/SWT_IMSK register) to 1 sets SIF1 to 1 at the 1 Hz signal falling edge.
D1 SIF10: 10 Hz Interrupt Flag
Interrupt flag indicating the 10 Hz interrupt factor occurrence status.
1(R): Interrupt factor present
0(R): No interrupt factor (default)
1(W): Reset flag
0(W): Disabled
Setting SIE10 (D1/SWT_IMSK register) to 1 sets SIF10 to 1 at the 10 Hz signal falling edge.
D0 SIF100: 100 Hz Interrupt Flag
Interrupt flag indicating the 100 Hz interrupt factor occurrence status.
1(R): Interrupt factor present
0(R): No interrupt factor (default)
1(W): Reset flag
0(W): Disabled
Setting SIE100 (D0/SWT_IMSK register) to 1 sets SIF100 to 1 at the 100 Hz signal falling edge.
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16.8 Precautions
• The OSC1 oscillator circuit must be set to On before operating the stopwatch timer.
• To prevent generating unnecessary interrupts, reset the SWT_IFLG register interrupt flag before permitting stop-
watch timer interrupts by the SWT_IMSK register.
• The stopwatch timer switches to Run/Stop mode when data is written to SWTRUN (D0/SWT_CTL resister) syn-
chronized with the 256 Hz signal falling edge. When 0 is written to SWTRUN, the timer switches to Stop state
after counting an additional “+1.” 1 is retained for SWTRUN reading until the timer actually stops.
Figure 16.8.1 shows the Run/Stop control timing chart.
SWTRUN(WR)
SWT_BCNT register 27 28 29 30 31 32
SWTRUN(RD)
256Hz
Figure 16.8.1: Run/Stop control timing chart
• Executing the slp command will destabilize a running stopwatch timer (SWTRUN = 1) during recovery from
SLEEP state. When switching to SLEEP state, set the stopwatch timer to STOP (SWTRUN = 0) before executing
the slp command.
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17WatchdogTimer(WDT)
17.1 Watchdog Timer Overview
The S1C17001 incorporates a watchdog timer that uses the OSC1 oscillator circuit as its oscillation source. The
watchdog timer generates an NMI or reset (selectable via software) to the CPU if not reset within 131,072/fOSC1
seconds (4 seconds when fOSC1 = 32.768 kHz).
Reset the watchdog timer via software within this cycle to prevent NMI/resets, which in turn enables runaway de-
tection for programs that do not pass through the processing routine.
Figure 17.1.1 illustrates the watchdog timer block diagram.
256Hz
NMI
Reset
10-bit counter
Interrupt
control circuit
Run/Stop control
NMI/Reset mode
selection
WDTRUN[3:0]
WDTMD
Watchdog timer reset WDTRST Watchdog timerOSC
OSC1 oscillation/
division circuit
Figure 17.1.1: Watchdog timer block diagram
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17.2 Operation Clock
The watchdog timer uses the 256 Hz clock output by the OSC module as the operation clock.
The OSC module generates this operation clock by dividing the OSC1 clock into 1/128, resulting in a frequency of
256 Hz when the OSC1 clock frequency is 32.768 kHz. The frequency described in this section will vary accord-
ingly for other OSC1 clock frequencies.
The OSC module does not include a 256 Hz clock output control bit. The 256 Hz clock is normally fed to the
watchdog timer when the OSC1 oscillation is on.
For detailed information on OSC1 oscillator circuit control, refer to “7 Oscillator Circuit (OSC).”
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17.3 Watchdog Timer Control
17.3.1 NMI/Reset Mode Selection
WDTMD (D1/WDT_ST register) is used to select whether an NMI signal or a reset signal is output when the
watchdog timer has not been reset within the NMI/Reset occurrence cycle.
* WDTMD: NMI/Reset Mode Select Bit in the Watchdog Timer Status (WDT_ST) Register (D1/0x5041)
To generate an NMI, set WDTMD to 0 (default). Set to 1 to generate a reset.
17.3.2 Watchdog Timer Run/Stop Control
The watchdog timer starts counting when a value other than 0b1010 is written to WDTRUN[3:0] (D[3:0]/WDT_
CTL register) and stops when 0b1010 is written.
* WDTRUN[3:0]: Watchdog Timer Run/Stop Control Bits in the Watchdog Timer Control (WDT_CTL) Register
(D[3:0]/0x5040)
Initial resetting sets WDTRUN[3:0] to 0b1010 and stops the watchdog timer.
Since an NMI or Reset may be generated immediately after running depending on the counter value, the watchdog
timer should also be reset concurrently (before running the watchdog timer), as explained in the following section.
17.3.3 Watchdog Timer Resetting
To reset the watchdog timer, write 1 to WDTRST (D4/WDT_CTL register).
* WDTRST: Watchdog Timer Reset Bit in the Watchdog Timer Control (WDT_CTL) Register (D4/0x5040)
A location should be provided for periodically processing the routine for resetting the watchdog timer before an
NMI or Reset is generated when using the watchdog timer. Process this routine within 131,072/fOSC1 second (4 sec-
onds when fOSC1 = 32.768 kHz) cycle.
After resetting, the watchdog timer starts counting with a new NMI/Reset generation cycle.
If the watchdog timer is not reset within the NMI/Reset generation cycle for any reason, the CPU is switched to
interrupt processing by NMI or resetting, an interrupt vector is read out, and an interrupt processing routine is ex-
ecuted.
The reset and NMI vector addresses are 0x8000 and 0x8008.
If the counter overflows and generates an NMI without the watchdog timer being reset, WDTST (D0/WDT_ST
register) is set to 1.
* WDTST: NMI Status Bit in the Watchdog Timer Status (WDT_ST) Register (D0/0x5041)
This bit is provided to confirm that the watchdog timer was the source of the NMI.
The WDTST set to 1 is cleared to 0 by resetting the watchdog timer.
17.3.4 Operation in Standby Mode
HALT mode
The watchdog timer operates in HALT mode, as the clock is fed. HALT mode is therefore canceled by an NMI
or Reset if it continues for more than the NMI/Reset cycle. To disable the watchdog timer while in HALT
mode, stop the watchdog timer by writing 0b1010 to WDTRUN[3:0] before executing the halt command. Reset
the watchdog timer before resuming operations after HALT mode is canceled.
SLEEP mode
The clock fed from the OSC module is stopped in SLEEP mode, which also stops the watchdog timer. To pre-
vent generation of an unnecessary NMI or Reset after canceling SLEEP mode, reset the watchdog timer before
executing the slp command. The watchdog should also be stopped as required using WDTRUN[3:0].
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17.4 Control Register Details
Table 17.4.1 Watchdog timer register list
Address Register name Function
0x5040 WDT_CTL Watchdog Timer Control Register Timer reset and Run/Stop control
0x5041 WDT_ST Watchdog Timer Status Register Timer mode setting and NMI status display
The watchdog timer registers are described in detail below. These are 8-bit registers.
Note: When data is written to the registers, the “Reserved” bits must always be written as 0 and not 1.
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0x5040: Watchdog Timer Control Register (WDT_CTL)
Register name Address Bit Name Function Setting Init. R/W Remarks
Watchdog
Timer
Control
Register
(WDT_CTL)
0x5040
(8 bits)
D7–5 –reserved – – – 0 when being read.
D4 WDTRST Watchdog timer reset 1 Reset 0 Ignored 0 W
D3–0
WDTRUN[3:0]
Watchdog timer run/stop control
Other than 1010
Run
1010
Stop
1010 R/W
D[7:5] Reserved
D4 WDTRST: Watchdog Timer Reset Bit
Resets the watchdog timer.
1 (W): Reset
0 (W): Disabled
0 (R): Normally 0 when read out (default)
To use the watchdog timer, it must be reset by writing 1 to this bit within the NMI/Reset generation
cycle (4 seconds when fOSC1 = 32.768 kHz).
This resets the up-counter to 0 and starts counting with a new NMI/Reset generation cycle.
D[3:0] WDTRUN[3:0]: Watchdog Timer Run/Stop Control Bits
Controls the watchdog timer Run/Stop.
Values other than 0b1010 (R/W): Run
0b1010 (R/W): Stop (default)
The watchdog timer must also be reset to prevent generation of an unnecessary NMI or Reset while the
watchdog timer operates.
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0x5041: Watchdog Timer Status Register (WDT_ST)
Register name Address Bit Name Function Setting Init. R/W Remarks
Watchdog
Timer Status
Register
(WDT_ST)
0x5041
(8 bits)
D7–2 –reserved – – – 0 when being read.
D1 WDTMD NMI/Reset mode select 1 Reset 0 NMI 0 R/W
D0 WDTST NMI status 1 NMI oc-
curred
0 Not oc-
curred
0 R
D[7:2] Reserved
D1 WDTMD: NMI/Reset Mode Select Bit
Selects NMI or Reset generation on counter overflow.
1 (R/W): Reset
0 (R/W): NMI (default)
Setting this bit to 1 outputs a reset signal when the counter overflows. Setting to 0 outputs an NMI
signal.
D0 WDTST: NMI Status Bit
Indicates a counter overflow and NMI occurrence.
1 (R): NMI occurred (counter overflow)
0 (R): NMI did not occur (default)
This bit confirms that the watchdog timer was the source of the NMI.
The WDTST set to 1 is cleared to 0 by resetting the watchdog timer.
This is also set by a counter overflow if reset output is selected, but is cleared by initial resetting and
cannot be confirmed.
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17.5 Precautions
• When the watchdog timer is running, this must be reset by software within a 131,072 fOSC1 seconds (4 seconds
when fOSC1 = 32.768 kHz) cycle.
• The watchdog timer must also be reset to prevent generation of an unnecessary NMI or Reset while the watchdog
timer operates.
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18 UART
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18UART
18.1 UART Configuration
The S1C17001 incorporates a single-channel UART. The UART transfers asynchronous data with external devices
at a transfer rate of 150 to 460,800 bps (115,200 bps in IrDA mode). It includes a 2-byte receive data buffer and
1-byte transmit data buffer and is capable of full-duplex communications. The transfer clock can be either the inter-
nal clock using the timer module or an external clock input via the SCLK (P25) pin. Data length (7 or 8 bits), stop
bit length (1 or 2 bits), and parity mode (even, odd, no parity) can be selected via the software. The start bit is fixed
at 1 bit. Overrun errors, framing errors, and parity errors can be detected while receiving data. The UART generates
three different interrupt types (transmit buffer empty, receive buffer full, and receive error) and enables efficient
processing of serial data transfer using interrupt processing.
This UART module also incorporates an RZI modulation/demodulation circuit that enables IrDA 1.0-compatible
infrared communications simply by adding basic external circuits.
Figure 18.1.1 illustrates the UART configuration.
Shift register
Receive data
buffer (2 bytes) SIN (P23)
sclk
(from 8-bit timer)
Internal bus
ITC
UART
Bus I/F
and
control
register
SCLK (P25)
Shift register
Transmit data
buffer (1 byte)
Clock/transfer control
SOUT (P24)
RZI demodulation
circuit
RZI modulation
circuit
Interrupt
control
Figure 18.1.1: UART configuration
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18.2 UART Pin
Table 18.2.1 lists the UART input/output pins.
Table 18.2.1: UART pin list
Pin name I/O Qty Function
SIN (P23) I 1 UART data input pin
Inputs serial data sent from an external device.
SOUT (P24) O 1 UART data output pin
Outputs serial data sent to an external device.
SCLK (P25) I 1 UART clock input pin
Inputs the external clock when used for the transfer clock.
The UART input/output pins (SIN, SOUT, SCLK) are shared with general purpose input/output port pins (P23,
P24, P25) and are initially set as general purpose input/output port pins. The function must be switched using the
P2_PMUX register setting to use general purpose input/output port pins as UART input/output pins. Switch the
pins to serial interface mode by setting the following control bits to 1.
P23 → SIN
* P23MUX: P23 Port Function Select Bit in the P2 Port Function Select (P2_PMUX) Register (D3/0x52a2)
P24 → SOUT
* P24MUX: P24 Port Function Select Bit in the P2 Port Function Select (P2_PMUX) Register (D4/0x52a2)
P25 → SCLK (only when using external clock)
* P25MUX: P25 Port Function Select Bit in the P2 Port Function Select (P2_PMUX) Register (D5/0x52a2)
For detailed information on pin function switching, refer to “10.2 Input/output Pin Function Selection (Port
MUX).”
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18.3 Transfer Clock
The UART transfer clock can be set to internal or external using SSCK (D0/UART_MOD register).
* SSCK: Input Clock Select Bit in the UART Mode (UART_MOD) Register (D0/0x4103)
Note: Make sure the UART is halted (when RXEN/UART_CTL register = 0) before changing SSCK.
* RXEN: UART Enable Bit in the UART Control (UART_CTL) Register (D0/0x4104)
Internal clock
Setting SSCK to 0 (default) selects the internal clock. Since the UART uses the 8-bit timer output clock as the
transfer clock, the 8-bit timer must be programmed to output a clock suited to the transfer rate.
For detailed information on 8-bit timer control, refer to “12 8-bit Timer (T8F).”
External clock
Setting SSCK to 1 selects the external clock. In this case, set P25 to the SCLK pin (see Section 18.2) to input
the external clock.
Note: • The UART generates a sampling clock that divides the 8-bit timer output into 1/16 divisions. Be
careful when setting the transfer rate.
• To input the external clock via the SCLK pin, the clock frequency must be less than half of the
PCLK and have a duty ratio of 50%.
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18.4 Transfer Data Settings
Set the following conditions to set the transfer data format.
• Data length: 7 or 8 bits
• Start bit: Fixed at 1 bit
• Stop bit: 1 or 2 bits
• Parity bit: Even, odd, no parity
Note: Make sure the UART is halted (when RXEN/UART_CTL register = 0) before changing transfer
data format settings.
* RXEN: UART Enable Bit in the UART Control (UART_CTL) Register (D0/0x4104)
Data length
The data length is selected by CHLN (D4/UART_MOD register). Setting CHLN to 0 (default) sets the data
length to 7 bits. Setting CHLN to 1 sets the data length to 8 bits.
* CHLN: Character Length Select Bit in the UART Mode (UART_MOD) Register (D4/0x4103)
Stop bit
The stop bit length is selected by STPB (D1/UART_MOD register). Setting STPB to 0 (default) sets the stop
bit length to 1 bit. Setting STPB to 1 sets the stop bit length to 2 bits.
* STPB: Stop Bit Select Bit in the UART Mode (UART_MOD) Register (D1/0x4103)
Parity bit
Whether the parity function is enabled or disabled is selected by PREN (D3/UART_MOD register). Setting
PREN to 0 (default) disables the parity function. In this case, no parity bit is added to the transfer data and the
data is not checked for parity when received. Setting PREN to 1 enables the parity function. In this case, a par-
ity bit is added to the transfer data and the data is checked for parity when received.
When the parity function is enabled, the parity mode is selected by PMD (D2/UART_MOD register). Setting
PMD to 0 (default) adds a parity bit and checks for even parity. Setting PMD to 1 adds a parity bit and checks
for odd parity.
* PREN: Parity Enable Bit in the UART Mode (UART_MOD) Register (D3/0x4103)
* PMD: Parity Mode Select Bit in the UART Mode (UART_MOD) Register (D2/0x4103)
Sampling clock (sclk-1/16)
CHLN = 0, PREN = 0, STPB = 0
CHLN = 0, PREN = 1, STPB = 0
CHLN = 0, PREN = 0, STPB = 1
CHLN = 0, PREN = 1, STPB = 1
CHLN = 1, PREN = 0, STPB = 0
CHLN = 1, PREN = 1, STPB = 0
CHLN = 1, PREN = 0, STPB = 1
CHLN = 1, PREN = 1, STPB = 1
s1: Start bit, s2 & s3: Stop bits, p: Parity bit
s1 D0 D1 D2 D3 D4 D5 D6 s2
s1 D0 D1 D2 D3 D4 D5 D6 p s2
s1 D0 D1 D2 D3 D4 D5 D6 s2 s3
s1 D0 D1 D2 D3 D4 D5 D6 p s2 s3
s1 D0 D1 D2 D3 D4 D5 D6 D7 s2
s1 D0 D1 D2 D3 D4 D5 D6 D7 p s2
s1 D0 D1 D2 D3 D4 D5 D6 D7 s2 s3
s1 D0 D1 D2 D3 D4 D5 D6 D7 p s2 s3
Figure 18.4.1: Transfer data format
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18.5 Data Transfer Control
Make the following settings before starting data transfers.
(1) Select input clock. (See Section 18.3.)
To use the internal clock, program the 8-bit timer to output the transfer clock. See Section 12.
(2) Set the transfer data format. (See Section 18.4.)
(3) To use the IrDA interface, set IrDA mode. (See Section 18.8.)
(4) Set interrupt conditions to use UART interrupts. (See Section 18.7.)
Note: Make sure the UART is halted (when RXEN/UART_CTL register = 0) before changing the above
settings.
* RXEN: UART Enable Bit in the UART Control (UART_CTL) Register (D0/0x4104)
Permitting data transfers
Set the RXEN bit (D0/UART_CTL register) to 1 to permit data transfers. This switches transfer circuits to en-
able transfers.
Note: Do not set the RXEN bit to 0 while the UART is sending or receiving data.
Data transfer control
To start data transmission, write the transmission data to the UART_TXD register (0x4101).
* UART_TXD: UART Transmit Data Register (0x4101)
The data is written to the transmit data buffer, and the transmission circuit starts sending data.
The buffer data is sent to the transmit shift register, and the start bit is output from the SOUT pin. The data in
the shift register is then output from the LSB. The transfer data bit is shifted in sync with the sampling clock
rising edge and output in sequence via the SOUT pin. Following output of MSB, the parity bit (if parity is en-
abled) and stop bit are output.
The transmission circuit includes the TDBE (D0/UART_ST register) and TRBS (D2/UART_ST register) status
flags.
* TDBE: Transmit Data Buffer Empty Flag in the UART Status (UART_ST) Register (D0/0x4100)
* TRBS: Transmit Busy Flag in the UART Status (UART_ST) Register (D2/0x4100)
The TDBE flag indicates the transmit data buffer status. This flag switches to 0 when the application program
writes data to the transmit data buffer and reverts to 1 when the buffer data is sent to the transmit shift register.
Interrupts can be generated when this flag is 1 (see Section 18.7). Subsequent data is sent after confirming that
the transmit data buffer is empty either by using this interrupt or by inspecting the TDBE flag. The transmission
buffer size is 1 byte, but a shift register is provided separately to allow data to be written while the previous
data is being sent. Always confirm that the transmit data buffer is empty before writing transmission data. Writ-
ing data while the TDBE flag is 0 will overwrite earlier transmission data inside the transmit data buffer.
The TRBS flag indicates the shift register status. This flag switches to 1 when transmission data is loaded from
the transmit data buffer to the shift register and reverts to 0 once the data is sent. Read this flag to check wheth-
er the transmission circuit is operating or at standby.
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S1: Start bit, S2: Stop bit, P: Parity bit,
Wr: data writing to transmit data buffer
Sampling clock
SOUT
TDBE
TRBS
Interrupt
S1 D0 D1 D2 D3 D4 D5 D6 D7 P S2 S1 D0 D1 D7 P S2 S1 D0 D1 D7 P
Wr Wr Wr
S2
Figure 18.5.1: Data transmission timing chart
Data reception control
The receiving circuit is launched by setting the RXEN bit to 1, enabling data to be received from an external
serial device.
When the external serial device sends the start bit, the receiving circuit detects its Low level and starts sampling
the following data bits. The data bits are sampled at the sampling clock rising edge, and the lead bit is loaded
into the receive shift register as LSB. Once the MSB has been received into the shift register, the received data
is loaded into the receive data buffer. If parity checking is enabled, the receiving circuit checks parity at the
same time by checking the parity bit received immediately after the MSB.
The receive data buffer, a 2-byte FIFO, receives data until full.
Received data in the buffer can be read from the UART_RXD register (0x4102). The oldest data is read out
first, clearing the register.
* UART_RXD: UART Receive Data Register (0x4102)
The receiving circuit includes the RDRY (D1/UART_ST register) and RD2B (D3/UART_ST register) buffer
status flags.
* RDRY: Receive Data Ready Flag in the UART Status (UART_ST) Register (D1/0x4100)
* RD2B: Second Byte Receive Flag in the UART Status (UART_ST) Register (D3/0x4100)
The RDRY flag indicates that the receive data buffer still contains data. The RD2B flag indicates that the re-
ceive data buffer is full.
(1) RDRY = 0, RD2B = 0
The receive data buffer contents need not be read, since no data has been received.
(2) RDRY = 1, RD2B = 0
One data item has been received. Read the receive data buffer once. This reading resets the RDRY flag. The
buffer reverts to state (1) above.
If the receive data buffer contents are read twice, the second data read will be invalid.
(3) RDRY = 1, RD2B = 1
Two 8-bit data have been received. Read the receive data buffer contents twice. The receive data buffer
outputs the oldest data first. This reading resets the RD2B flag. The buffer then reverts to the state in (2)
above. The second read outputs the most recent received data, after which the buffer reverts to the state in (1)
above.
Even when the receive data buffer is full, the shift register can start receiving one more 8-bit data. An
overrun error will occur if receiving is finished before the receive data buffer has been read. In this case, the
last received data cannot be read. The contents of the receive data buffer must be read out before an overrun
error occurs. For detailed information on overrun errors, refer to Section 18.6.
The volume of data received can be checked by reading these flags.
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The UART allows receive buffer full interrupts to be generated once data has been received in the receive data
buffer. These interrupts can be used to read the receive data buffer. With default settings, a receive buffer full
interrupt occurs when the receive data buffer receives one item of data (status (2) above). This can be changed
by setting the RBFI bit (D1/UART_CTL register) to 1 so that an interrupt occurs when the receive data buffer
receives two items of data.
* RBFI: Receive Buffer Full Interrupt Condition Setup Bit in the UART Control (UART_CTL) Register (D1/0x4104)
Three error flags are also provided in addition to the flags previously mentioned. See Section 18.6 for detailed
information on flags and receive errors.
Receive buffer full interrupt request
(RBFI = 0)
Overrun error
interrupt request
Sampling clock
SIN
Receive data buffer
RDRY
RD2B
RXD[7:0]
Interrupt
data 1
S1 D0 ··· P S2 S1 D0 ··· P S2 S1 D0 ··· P S2 S1 D0 ··· P S2 S1 D0 ··· P S2 S1 D0 ··· P S2
data 2 data 3 data 4 data 5 data 6
Rd
Rd
data 3, 4data 2data 1 –
data 2, 3
data 3
data 3data 2data 1
S1: Start bit, S2: Stop bit, P: Parity bit, Rd: Data bits from RXD[7:0]
Figure 18.5.2: Data receiving timing chart
Blocking data transfers
After a data transfer is completed (both transmission and reception), data transfers are blocked by writing 0 to
the RXEN bit. Confirm that the TDBE flag is 1 and the TRBS and RDRY flags are both 0 before blocking data
transfer.
Setting the RXEN bit to 0 empties the transmission data buffer, clearing any remaining data. The data being
transferred cannot be guaranteed if RXEN is set to 0 while data is being sent or received.
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18.6 Receive Errors
Three different receive errors may be detected while receiving data.
Since receive errors are interrupt factors, they can be processed by generating interrupts. For more information on
UART interrupt control, refer to Section 18.7.
Parity error
If PREN (D3/UART_MOD register) has been set to 1 (parity enabled), data received is checked for parity.
Data received in the shift register is checked for parity when sent to the receive data buffer. The matching is
checked against the PMD (D2/UART_MOD register) setting (odd or even parity). If the result is a non-match, a
parity error is issued, and the parity error flag PER (D5/UART_ST register) is set to 1.
Even if this error occurs, the data received is sent to the receive data buffer, and the receiving operation contin-
ues. However, the received data cannot be guaranteed if a parity error occurs.
The PER flag (D5/UART_ST register) is reset to 0 by writing as 1.
* PREN: Parity Enable Bit in the UART Mode (UART_MOD) Register (D3/0x4103)
* PMD: Parity Mode Select Bit in the UART Mode (UART_MOD) Register (D2/0x4103)
* PER: Parity Error Flag in the UART Status (UART_ST) Register (D5/0x4100)
Framing error
A framing error occurs if the stop bit is received as 0 and the UART determines sync offset. If the stop bit is set
to two bits, only the first bit is checked.
The framing error flag FER (D6/UART_ST register) is set to 1 if this error occurs. The received data is still
transferred to the receive data buffer if this error occurs and the receiving operation continues, but the data can-
not be guaranteed, even if no framing error occurs for subsequent data receiving.
The FER flag (D6/UART_ST register) is reset to 0 by writing as 1.
* FER: Framing Error Flag in the UART Status (UART_ST) Register (D6/0x4100)
Overrun error
Even if the receive data buffer is full (two data items already received), a third item of data can be received in
the shift register. However, if the receive data buffer is not emptied (by reading out data received) by the time
this data has been received, the third data received in the shift register will not be sent to the buffer and generate
an overrun error.
If an overrun error occurs, the overrun error flag OER (D4/UART_ST register) is set to 1.
The receiving operation continues even if this error occurs.
The OER flag (D4/UART_ST register) is reset to 0 by writing as 1.
* OER: Overrun Error Flag in the UART Status (UART_ST) Register (D4/0x4100)
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18.7 UART Interrupts
The UART includes a function for generating the following three different interrupt types.
• Transmit buffer empty interrupt
• Receive buffer full interrupt
• Receive error interrupt
The UART outputs one interrupt signal shared by the three above interrupt factor types to the interrupt controller
(ITC). Inspect the status flag or error flag to determine the interrupt factor occurring.
Transmit buffer empty interrupt
To use this interrupt, set TIEN (D4/UART_CTL register) to 1. If TIEN is set to 0 (default), interrupt requests
for this factor will not be sent to the ITC.
* TIEN: Transmit Buffer Empty Interrupt Enable Bit in the UART Control (UART_CTL) Register (D4/0x4104)
When transmission data written to the transmit data buffer is transferred to the shift register, the UART sets
the TDBE bit (D0/UART_ST register) to 1, indicating that the transmit data buffer is empty. If transmit buffer
empty interrupts are permitted (TIEN = 1), an interrupt request pulse is sent simultaneously to the ITC.
* TDBE: Transmit Data Buffer Empty Flag in the UART Status (UART_ST) Register (D0/0x4100)
An interrupt occurs if other interrupt conditions are met.
You can inspect the TDBE flag in the UART interrupt processing routine to determine whether the UART in-
terrupt is attributable to a transmit buffer empty. If TDBE is 0, the next transmission data can be written to the
transmit data buffer by the interrupt processing routine.
Receive buffer full interrupt
To use this interrupt, set RIEN (D5/UART_CTL register) to 1. If RIEN is set to 0 (default), interrupt requests
for this factor will not be sent to the ITC.
* RIEN: Receive Buffer Full Interrupt Enable Bit in the UART Control (UART_CTL) Register (D5/0x4104)
If the specified volume of received data is loaded into the receive data buffer when a receive buffer full inter-
rupt is permitted (RIEN = 1), the UART outputs an interrupt request pulse to the ITC. If RBFI (D1/UART_CTL
register) is 0, an interrupt request pulse is output as soon as one item of received data is loaded into the receive
data buffer (RDRY flag (D1/UART_ST register) is set to 1). If RBFI (D1/UART_CTL register) is 1, an inter-
rupt request pulse is output as soon as two items of received data are loaded into the receive data buffer (RD2B
flag (D3/UART_ST register) is set to 1).
* RBFI:
Receive Buffer Full Interrupt Condition Setup Bit in the UART Control (UART_CTL) Register (D1/0x4104)
* RDRY: Receive Data Ready Flag in the UART Status (UART_ST) Register (D1/0x4100)
* RD2B: Second Byte Receive Flag in the UART Status (UART_ST) Register (D3/0x4100)
An interrupt occurs if other interrupt conditions are met.
You can inspect the RDRY and RD2B flags in the UART interrupt processing routine to determine whether the
UART interrupt is attributable to a receive buffer full. If RDRY or RD2B is 1, the received data can be read
from the receive data buffer by the interrupt processing routine.
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Receive error interrupt
To use this interrupt, set REIEN (D6/UART_CTL register) to 1. If REIEN is set to 0 (default), interrupt re-
quests will not be sent to the ITC for this factor.
* REIEN: Receive Error Interrupt Enable Bit in the UART Control (UART_CTL) Register (D6/0x4104)
The UART sets the error flags shown below to 1 if a parity error, framing error, or overrun error is detected
when receiving data. If receive error interrupts are permitted (REIEN = 1), an interrupt request pulse is output
at the same time to the ITC.
* PER: Parity Error Flag in the UART Status (UART_ST) Register (D5/0x4100)
* FER: Framing Error Flag in the UART Status (UART_ST) Register (D6/0x4100)
* OER: Overrun Error Flag in the UART Status (UART_ST) Register (D4/0x4100)
If other interrupt conditions are satisfied, an interrupt occurs.
Inspect the error flags above as part of the UART interrupt processing routine to determine whether the UART
interrupt was caused by a receive error. If any of the error flags has the value 1, the interrupt processing routine
will proceed with error recovery.
UART interrupt ITC registers
The UART ITC control bits are listed below.
Interrupt flag
* IIFT4: UART Interrupt Flag in the Interrupt Flag (ITC_IFLG) Register (D12/0x4300)
Interrupt enable bit
* IIEN4: UART Interrupt Enable Bit in the Interrupt Enable (ITC_EN) Register (D12/0x4302)
Interrupt level setting bit
* IILV4[2:0]: UART Interrupt Level Bits in the Internal Interrupt Level Setup (ITC_ILV2) Register 2
(D[2:0]/0x4312)
If an interrupt request pulse is output by the UART, the corresponding interrupt flag is set to 1.
If the interrupt enable bit corresponding to this interrupt flag is set to 1, the ITC sends an interrupt request to
the S1C17 core. To prohibit UART interrupts, set the interrupt enable bit to 0. The interrupt flag is set to 1 by a
UART interrupt request pulse, regardless of the interrupt enable bit setting (i.e., even if set to 0).
The interrupt level setting bit sets the UART interrupt level (0 to 7).
The S1C17 core accepts interrupts when all of the following conditions are met:
• The interrupt enable bit is set to 1.
• The PSR (S1C17 core internal processor status register) IE (interrupt enable) bit is set to 1.
• The UART interrupt has a higher interrupt level set than that set for the PSR IL (interrupt level).
• No other interrupt factors having higher precedence (e.g., NMI) are present.
For detailed information on these interrupt registers and operations when interrupts occur, refer to “6 Interrupt
Controller (ITC).”
Interrupt vectors
The UART interrupt vector numbers and vector addresses are as listed below.
Vector number: 16 (0x10)
Vector address: 0x8040
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18.8 IrDA Interface
This UART module incorporates an RZI modulation/demodulation circuit enabling implementation of IrDA
1.0-compatible infrared communication simply by adding basic external circuits.
The transmission data output from the UART transmit shift register is input to the modulation circuit and output
from the SOUT pin after the Low pulse has been modulated to a 3/16 sclk cycle.
sclk
Modulation circuit input (shift register output)
Modulation circuit output (SOUT)
1 2 3 8 9 10 11 16
3 × sclk
Modulation circuit input (shift register output)
Modulation circuit output (SOUT)
S1 D0 D1 D2 D3 D4 D5 D6 D7 P S2 S3
(S1: Start bit, S2 & S3: Stop bits, P: Parity bit)
Figure 18.8.1: Transmission signal waveform
The received IrDA signal is input to the demodulation circuit and the Low pulse width is converted to 16 sclk cy-
cles before entry to the receive shift register. The demodulation circuit uses the pulse detection clock selected from
the prescaler output clock separately from the transfer cock to detect Low pulses input (when minimum pulse width
= 1.41 µs/115,200 bps).
(S1: Start bit, S2 & S3: Stop bits, P: Parity bit)
sclk
irclk
Demodulation circuit input (SIN)
Demodulation circuit output
(shift register input)
1 2 3 4 16
16 × sclkAt least 2 × irclk
Demodulation circuit input (SIN)
S1 D0 D1 D2 D3 D4 D5 D6 D7 P S2 S3
Demodulation circuit output
(shift register input)
Figure 18.8.2: Receive signal waveform
IrDA enable
To use the IrDA interface function, set IRMD (D0/UART_EXP register) to 1. This enables the RZI modulation/
demodulation circuit.
* IRMD: IrDA Mode Select Bit in the UART Expansion (UART_EXP) Register (D0/0x4105)
Note: This must be set before setting other UART conditions.
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IrDA receive detection clock selection
The input pulse detection clock is selected from among the prescaler output clock PCLK-1/1 to PCLK-1/128
using IRCLK[2:0] (D[6:4]/UART_EXP register)
* IRCLK[2:0]: IrDA Receive Detection Clock Select Bits in the UART Expansion (UART_EXP) Register
(D[6:4]/0x4105)
Table 18.8.1: IrDA receive detection clock selection
IRCLK[2:0] Prescaler output clock
0x7 PCLK-1/128
0x6 PCLK-1/64
0x5 PCLK-1/32
0x4 PCLK-1/16
0x3 PCLK-1/8
0x2 PCLK-1/4
0x1 PCLK-1/2
0x0 PCLK-1/1
(Default: 0x0)
This clock must be selected as a clock faster than the 8-bit timer or transfer clock sclk input via the SCLK pin.
The demodulation circuit treats Low pulses with a width of at least 2 IrDA receive detection clock cycles as
valid and converts them to 16 sclk cycle width Low pulses. Select the prescaler output clock to enable detection
of input pulses with a minimum width of 1.41 µs.
Serial data transfer control
Data transfer control in IrDA mode is identical to that for normal interfaces. For detailed information on data
format settings and data transfer and interrupt control methods, refer to the previous discussions.
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18.9 Control Register Details
Table 18.9.1: UART register list
Address Register name Function
0x4100 UART_ST UART Status Register Transfer, buffer, error status display
0x4101 UART_TXD UART Transmit Data Register Transmission data
0x4102 UART_RXD UART Receive Data Register Received data
0x4103 UART_MOD UART Mode Register Transfer data format setting
0x4104 UART_CTL UART Control Register Data transfer control
0x4105 UART_EXP UART Expansion Register IrDA mode setting
The UART registers are described in detail below. These are 8-bit registers.
Note: When data is written to the registers, the “Reserved” bits must always be written as 0 and not 1.
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0x4100: UART Status Register (UART_ST)
Register name Address Bit Name Function Setting Init. R/W Remarks
UART Status
Register
(UART_ST)
0x4100
(8 bits)
D7 –reserved – – – 0 when being read.
D6 FER Framing error flag 1 Error 0 Normal 0 R/W Reset by writing 1.
D5 PER Parity error flag 1 Error 0 Normal 0 R/W
D4 OER Overrun error flag 1 Error 0 Normal 0 R/W
D3 RD2B Second byte receive flag 1 Ready 0 Empty 0 R
D2 TRBS Transmit busy flag 1 Busy 0 Idle 0 R Shift register status
D1 RDRY Receive data ready flag 1 Ready 0 Empty 0 R
D0 TDBE Transmit data buffer empty flag 1 Empty 0 Not empty 1 R
D7 Reserved
D6 FER: Framing Error Flag
Indicates whether a framing error has occurred.
1 (R): Error occurred
0 (R): No error (default)
1 (W): Reset to 0
0 (W): Disabled
FER is set to 1 when a framing error occurs. Framing errors occur when data is received with the stop
bit set to 0.
FER is reset by writing 1.
D5 PER: Parity Error Flag
Indicates whether a parity error has occurred.
1 (R): Error occurred
0 (R): No error (default)
1 (W): Reset to 0
0 (W): Disabled
PER is set to 1 when a parity error occurs. Parity checking is enabled only when PREN (D3/
UART_MOD register) is set to 1 and is performed when received data is transferred from the shift reg-
ister to the receive data buffer.
PER is reset by writing 1.
D4 OER: Overrun Error Flag
Indicates whether an overrun error has occurred.
1 (R): Error occurred
0 (R): No error (default)
1 (W): Reset to 0
0 (W): Disabled
OER is set to 1 when an overrun error occurs. Overrun errors occur when data is received in the shift
register when the receive data buffer is already full and additional data is sent. The receive data buffer
is not overwritten if this error occurs. The shift register is overwritten as soon as the error occurs.
OER is reset by writing 1.
D3 RD2B: Second Byte Received Flag
Indicates that the receive data buffer contains two items of received data.
1 (R): Second byte can be read
0 (R): Second byte not received (default)
RD2B is set to 1 when the second byte of data is loaded into the receive data buffer and is reset to 0
when the first data is read from the receive data buffer.
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D2 TRBS: Transmit Busy Flag
Indicates the transmit shift register status.
1 (R): Operating
0 (R): Standby (default)
TRBS is set to 1 when transmission data is loaded from the transmit data buffer into the shift register
and is reset to 0 when the data transfer is complete. Inspect TRBS to determine whether the transmit
circuit is operating or at standby.
D1 RDRY: Receive Data Ready Flag
Indicates that the receive data buffer contains valid received data.
1 (R): Data can be read
0 (R): Buffer empty (default)
RDRY is set to 1 when received data is loaded into the receive data buffer and is reset to 0 when all data
has been read from the receive data buffer.
D0 TDBE: Transmit Data Buffer Empty Flag
Indicates the state of the transmit data buffer.
1 (R): Buffer empty (default)
0 (R): Data exists
TDBE is reset to 0 when transmit data is written to the transmit data buffer and is set to 1 when the data
is transferred to the shift register.
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0x4101: UART Transmit Data Register (UART_TXD)
Register name Address Bit Name Function Setting Init. R/W Remarks
UART Transmit
Data Register
(UART_TXD)
0x4101
(8 bits)
D7–0 TXD[7:0] Transmit data
TXD7(6) = MSB
TXD0 = LSB
0x0 to 0xff (0x7f) 0x0 R/W
D[7:0] TXD[7:0]: Transmit Data
Write transmit data to be set in the transmit data buffer. (Default: 0x0)
The UART begins transmitting when data is written to this register. Data written to TXD[7:0] is re-
tained until sent to the transmit data buffer.
Transmitting data from within the transmit data buffer generates a transmit buffer empty interrupt fac-
tor.
TXD7 (MSB) is invalid in 7-bit mode.
Serial converted data is output from the SOUT pin, with the LSB first bits set to 1 as High level and bits
set to 0 as Low level.
This register can also be read from.
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0x4102: UART Receive Data Register (UART_RXD)
Register name Address Bit Name Function Setting Init. R/W Remarks
UART Receive
Data Register
(UART_RXD)
0x4102
(8 bits)
D7–0 RXD[7:0] Receive data in the receive data
buffer
RXD7(6) = MSB
RXD0 = LSB
0x0 to 0xff (0x7f) 0x0 R Older data in the
buffer is read out
first.
D[7:0] RXD[7:0]: Receive Data
Data in the receive data buffer is read out in sequence, starting with the oldest. Received data is placed
in the receive data buffer. The receive data buffer is a 2-byte FIFO that allows proper data receipt until
it fills, even if data is not read out. If the buffer is full and the shift register also contains received data,
an overrun error will occur, unless the data is read out before receipt of the subsequent data starts.
The receive circuit includes two receive buffer status flags: RDRY (D1/UART_ST register) and RD2B
(D3/UART_ST register). The RDRY flag indicates the presence of valid received data in the receive
data buffer, while RD2B flag indicates the presence of two items of received data in the receive data
buffer.
A receive buffer full interrupt occurs when the received data in the receive data buffer reaches the num-
ber specified by RBFI (D1/UART_CTL register).
0 is loaded into RXD7 in 7-bit mode.
Serial data input via the SIN pin is converted to parallel, with the initial bit as LSB, the High level bit as 1,
and the Low level bit as 0. This data is then loaded into the receive data buffer.
This register is read-only. (Default: 0x0)
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0x4103: UART Mode Register (UART_MOD)
Register name Address Bit Name Function Setting Init. R/W Remarks
UART Mode
Register
(UART_MOD)
0x4103
(8 bits)
D7–5 –reserved – – – 0 when being read.
D4 CHLN Character length 1 8 bits 0 7 bits 0 R/W
D3 PREN Parity enable 1 With parity 0 No parity 0 R/W
D2 PMD Parity mode select 1 Odd 0 Even 0 R/W
D1 STPB Stop bit select 1 2 bits 0 1 bit 0 R/W
D0 SSCK Input clock select 1 External 0 Internal 0 R/W
D[7:5] Reserved
D4 CHLN: Character Length Select Bit
Selects the serial transfer data length.
1 (R/W): 8 bits
0 (R/W): 7 bits (default)
D3 PREN: Parity Enable Bit
Enables the parity function.
1 (R/W): With parity
0 (R/W): No parity (default)
PREN is used to select receive data parity checking and to determine whether a parity bit is added to
transmitted data. Setting PREN to 1 parity-checks the received data. A parity bit is automatically added
to the transmitted data. If PREN is set to 0, no parity bit is checked or added.
D2 PMD: Parity Mode Select Bit
Selects the parity mode.
1 (R/W): Odd parity
0 (R/W): Even parity (default)
Writing 1 to PMD selects odd parity; writing 0 to it selects even parity. Parity checking and parity bit
addition are enabled only when PREN (D3) is set to 1. The PMD setting is disabled if PREN (D3) is 0.
D1 STPB: Stop Bit Select Bit
Selects the stop bit length.
1 (R/W): 2 bits
0 (R/W): 1 bit (default)
Writing 1 to STPB selects two stop bits; writing 0 to it selects one bit. The start bit is fixed at one bit.
D0 SSCK: Input Clock Select Bit
Selects the input clock.
1 (R/W): External clock (SCLK)
0 (R/W): Internal clock (default)
Selects whether the internal clock (8-bit timer output clock) or external clock (input via SCLK pin) is
used. Writing 1 to SSCK selects the external clock; Writing 0 to it selects the internal clock.
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0x4104: UART Control Register (UART_CTL)
Register name Address Bit Name Function Setting Init. R/W Remarks
UART
Control
Register
(UART_CTL)
0x4104
(8 bits)
D7 –reserved – – – 0 when being read.
D6 REIEN Receive error int. enable 1 Enable 0 Disable 0 R/W
D5 RIEN Receive buffer full int. enable 1 Enable 0 Disable 0 R/W
D4 TIEN Transmit buffer empty int. enable 1 Enable 0 Disable 0 R/W
D3–2 –reserved – – – 0 when being read.
D1 RBFI Receive buffer full int. condition 1 2 bytes 0 1 byte 0 R/W
D0 RXEN UART enable 1 Enable 0 Disable 0 R/W
D7 Reserved
D6 REIEN: Receive Error Interrupt Enable Bit
Permits interrupt requests to the ITC when a receive error occurs.
1 (R/W): Permitted
0 (R/W): Prohibited (default)
Set this bit to 1 to process receive errors using interrupts.
D5 RIEN: Receive Buffer Full Interrupt Enable Bit
Permits interrupt requests to the ITC caused when the received data quantity in the receive data buffer
reaches the quantity specified in RBFI (D1).
1 (R/W): Permitted
0 (R/W): Prohibited (default)
Set this bit to 1 to read receive data using interrupts.
D4 TIEN: Transmit Buffer Empty Interrupt Enable Bit
Permits interrupt requests to the ITC caused when transmission data in the transmit data buffer is sent
to the shift register (i.e. when data transmission begins).
1 (R/W): Permitted
0 (R/W): Prohibited (default)
Set this bit to 1 to write data to the transmit data buffer using interrupts.
D[3:2] Reserved
D1 RBFI: Receive Buffer Full Interrupt Condition Setup Bit
Sets the quantity of data in the receive buffer to generate a receive buffer full interrupt.
1 (R/W): 2 bytes
0 (R/W): 1 byte (default)
If receive buffer full interrupts are permitted (RIEN = 1), the UART outputs an interrupt request pulse
to the ITC when the quantity of received data specified by RBFI is loaded into the receive data buffer.
If the RBFI bit is 0, an interrupt request pulse is output as soon as one item of received data is loaded
into the receive data buffer (when the RDRY flag (D1/UART_ST register) is set to 1). If RBFI is 1, an
interrupt request pulse is output as soon as two items of received data are loaded into the receive data
buffer (when the RD2B flag (D3/UART_ST register) is set to 1).
D0 RXEN: UART Enable Bit
Permits data transfer by the UART.
1 (R/W): Permitted
0 (R/W): Prohibited (default)
Set RXEN to 1 before starting UART transfers. Setting RXEN to 0 will stop data transfers. Set the
transfer conditions while RXEN is 0.
Preventing transfers by writing 0 to RXEN also clears transmit data buffer.
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0x4105: UART Expansion Register (UART_EXP)
Register name Address Bit Name Function Setting Init. R/W Remarks
UART
Expansion
Register
(UART_EXP)
0x4105
(8 bits)
D7 –reserved – – – 0 when being read.
D6–4 IRCLK[2:0] IrDA receive detection clock
select
IRCLK[2:0] Clock 0x0 R/W
0x7
0x6
0x5
0x4
0x3
0x2
0x1
0x0
PCLK-1/128
PCLK-1/64
PCLK-1/32
PCLK-1/16
PCLK-1/8
PCLK-1/4
PCLK-1/2
PCLK-1/1
D3–1 –reserved – – – 0 when being read.
D0 IRMD IrDA mode select 1 On 0 Off 0 R/W
D7 Reserved
D[6:4] IRCLK[2:0]: IrDA Receive Detection Clock Select Bits
Select the prescaler output clock used as the IrDA input pulse detection clock.
Table 18.9.2: IrDA receive detection clock selection
IRCLK[2:0] Prescaler output clock
0x7 PCLK-1/128
0x6 PCLK-1/64
0x5 PCLK-1/32
0x4 PCLK-1/16
0x3 PCLK-1/8
0x2 PCLK-1/4
0x1 PCLK-1/2
0x0 PCLK-1/1
(Default: 0x0)
This clock must be selected as a clock faster than the 8-bit timer or transfer clock sclk input via the
SCLK pin.
The demodulation circuit treats Low pulses with a width of at least 2 IrDA receive detection clock
cycles as valid. Select the appropriate prescaler output clock to enable detection of input pulses with a
minimum width of 1.41 µs.
D[3:1] Reserved
D0 IRMD: IrDA Mode Select Bit
Switches the IrDA interface function on and off.
1 (R/W): On
0 (R/W): Off (default)
Set this to 1 to use the IrDA interface. When this bit is set to 0, this module functions as a normal
UART, with no IrDA functions.
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18.10 Precautions
• Change the UART settings only while transfers are blocked (RXEN = 0).
* RXEN: UART Enable Bit in the UART Control (UART_CTL) Register (D0/0x4104)
• Do not set RXEN to 0 while the UART is transmitting or receiving data.
• The UART transfer rate is capped at 460,800 bps (115,200 bps in IrDA mode). Do not set faster transfer rates.
• Preventing transfer by setting RXEN to 0 clears (initializes) transfer data buffers. Before writing 0 to RXEN,
confirm the absence of data in the buffers awaiting transmission.
• The IrDA receive detection clock must be selected as a clock faster than the 8-bit timer or transfer clock sclk in-
put via the SCLK pin.
• The IrDA interface demodulation circuit treats Low pulses with a width of at least 2 IrDA receive detection clock
cycles as valid. Select the appropriate prescaler output clock to enable detection of input pulses with a minimum
width of 1.41 µs as a 2 IrDA receive detection clock.
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19SPI
19.1 SPI Configuration
The S1C17001 incorporates a synchronized serial interface module (SPI). This SPI module supports both Master
and Slave modes and is used for 8-bit data transfers. Four different data transfer timing patterns (clock phase and
polarity) can be selected.
The SPI module includes a transmit data buffer and receive data buffer separate from the shift register, and is ca-
pable of generating two different interrupt types (transmit buffer empty and receive buffer full). This allows easy
processing of continuous serial data transfer using interrupts.
Figure 19.1.1 illustrates the SPI module configuration.
Shift register
Receive data
buffer (1 byte) SDI
SPI clock
(from 16-bit timer Ch.1)
Internal bus
ITC
SPI
Bus I/F
and
control
register SPICLK
#SPISS
Shift register
Transmit data
buffer (1 byte)
Clock/transfer control
SDO
Interrupt
control
Figure 19.1.1: SPI module configuration
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19.2 SPI Input/Output Pins
Table 19.2.1 lists the SPI pins.
Table 19.2.1: SPI pin list
Pin name I/O Qty Function
SDI (P20) I 1 SPI data input pin
Inputs serial data from SPI bus.
SDO (P21) O 1 SPI data output pin
Outputs serial data to SPI bus.
SPICLK (P22) I/O 1 SPI external clock input/output pin
Outputs SPI clock when SPI is in Master mode.
Inputs external clock when SPI is used in Slave mode.
#SPISS (P17) I 1 SPI slave selection signal (active Low) input pin
SPI (Slave mode) is selected as slave device by Low input to this pin.
The SPI input/output pins (SDI, SDO, SPICLK, #SPISS) are shared with general purpose input/output port pins (P20,
P21, P22, P17) and are initially set as general purpose input/output port pins. The function must be switched using
the P2_PMUX and P1_PMUX register settings to use general purpose input/output port pins as SPI input/output
pins. Switch the pins to SPI mode by setting the following control bits to 1.
P20 → SDI
* P20MUX: P20 Port Function Select Bit in the P2 Port Function Select (P2_PMUX) Register (D0/0x52a2)
P21 → SDO
* P21MUX: P21 Port Function Select Bit in the P2 Port Function Select (P2_PMUX) Register (D1/0x52a2)
P22 → SPICLK
* P22MUX: P22 Port Function Select Bit in the P2 Port Function Select (P2_PMUX) Register (D2/0x52a2)
P17 → #SPISS
* P17MUX: P17 Port Function Select Bit in the P1 Port Function Select (P1_PMUX) Register (D7/0x52a1)
For detailed information on pin function switching, refer to “10.2 Input/Output Pin Function Selection (Port
MUX).”
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19.3 SPI Clock
The Master mode SPI uses the internal clock output by the 16-bit timer Ch.1 as the SPI clock. This clock is output
from the SPICLK pin to the slave device while also driving the shift register. It should be programmed to output a
clock matching the transfer rate from the 16-bit timer Ch.1. For detailed information on 16-bit timer control, refer
to “11 16-bit Timer (T16).”
PCLK
16-bit timer Ch.1 underflow signal
SPI clock (SPICLK output)
Figure 19.3.1: Master mode SPI clock
In Slave mode, the SPI clock is input via the SPICLK pin.
Note: The duty ratio of the clock input via the SPICLK pin must be 50%.
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19.4 Data Transfer Condition Settings
The SPI module can be set to Master or Slave modes. The SPI clock polarity and phase can also be set via the SPI_
CTL register.
The data length is fixed at 8 bits.
Note: Make sure the SPI module is halted (when SPEN/SPI_CTL register = 0) before Master/Slave
mode selection and clock condition settings.
* SPEN: SPI Enable Bit in the SPI Control (SPI_CTL) Register (D0/0x4326)
Master/Slave mode selection
MSSL (D1/SPI_CTL register) is used to set the SPI module to Master mode or Slave mode. Setting MSSL to 1
sets Master mode; setting it to 0 (default) sets Slave mode. In Master mode, data is transferred using the inter-
nal clock. In Slave mode, data is transferred by inputting the master device clock.
* MSSL: Master/Slave Mode Select Bit in the SPI Control (SPI_CTL) Register (D1/0x4326)
SPI clock polarity and phase settings
The SPI clock polarity is selected by CPOL (D2/SPI_CTL register). Setting CPOL to 1 treats the SPI clock as
active Low; setting it to 0 (default) treats it as active High.
* CPOL: Clock Polarity Select Bit in the SPI Control (SPI_CTL) Register (D2/0x4326)
The SPI clock phase is selected by CPHA (D3/SPI_CTL register).
* CPHA: Clock Phase Select Bit in the SPI Control (SPI_CTL) Register (D3/0x4326)
As shown below, these control bits set transfer timing.
SPICLK(CPOL = 1, CPHA = 1)
SPICLK(CPOL = 1, CPHA = 0)
SPICLK(CPOL = 0, CPHA = 1)
SPICLK(CPOL = 0, CPHA = 0)
SDI/SDO
Receive data load timing
to shift register
D7 (MSB) D0 (LSB)
Figure 19.4.1: Clock and data transfer timing
Note: When the SPI module is used in master mode with CPHA set to 0, the clock may change a mini-
mum of one system clock cycle time from change of the first transmit data bit.
PCLK
16-bit timer output
SPI_TXD register
SPICLKx
SDOx
write
Minimum1/fsysclk
Figure 19.4.2 SDOx and SPICLKx Change Timings when CPHA = 0
The half SPICLKx cycle will be secured from change of data to change of the clock for the second and following
transmit data bits and the second and following bytes during continuous transfer.
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19.5 Data Transfer Control
Make the following settings before starting data transfers.
(1) Set the 16-bit timer Ch.1 to output the SPI clock. (See Section 11.)
(2) Select Master mode or Slave mode. (See Section 19.4.)
(3) Set clock conditions. (See Section 19.4.)
(4) Set the interrupt conditions to use SPI interrupts. (See Section 19.6.)
Note: Make sure the SPI is halted (when SPEN/SPI_CTL register = 0) before changing the above set-
tings.
* SPEN: SPI Enable Bit in the SPI Control (SPI_CTL) Register (D0/0x4326)
Permitting data transfers
Set the SPEN bit (D0/SPI_CTL register) to 1 to permit SPI operations. This enables SPI transfers and permits
clock input/output.
Note: Do not set SPEN to 0 when the SPI module is transferring data.
Data transfer control
To start data transmission, write the transmission data to the SPI_TXD register (0x4322).
* SPI_TXD: SPI Transmit Data Register (0x4322)
The data is written to the transmit data buffer, and the SPI module begins sending data. The buffer data is sent
to the transmit shift register. In Master mode, the module starts clock output from the SPICLK pin. In Slave
mode, the module awaits clock input from the SPICLK pin. The data in the shift register is shifted in sequence
at the clock rising or falling edge, as determined by CPHA (D3/SPI_CTL register) and CPOL (D2/SPI_CTL
register) (see Figure 19.4.1) and sent from the SDO pin with MSB leading.
* CPHA: Clock Phase Select Bit in the SPI Control (SPI_CTL) Register (D3/0x4326)
* CPOL: Clock Polarity Select Bit in the SPI Control (SPI_CTL) Register (D2/0x4326)
The SPI module includes the SPTBE (D0/SPI_ST register) and SPBSY (D2/SPI_ST register) status flags for
transfer control.
* SPTBE: Transmit Data Buffer Empty Flag in the SPI Status (SPI_ST) Register (D0/0x4320)
* SPBSY: Transfer Busy Flag in the SPI Status (SPI_ST) Register (D2/0x4320)
The SPTBE flag indicates the transmit data buffer status. This flag switches to 0 when the application program
writes data to the SPI_TXD register (transmit data buffer) and reverts to 1 when the buffer data is sent to the
transmit shift register. Interrupts can be generated when this flag is 1 (see Section 19.6). Subsequent data is sent
after confirming that the transmit data buffer is empty either by using this interrupt or by inspecting the SPTBE
flag. The transmission buffer size is 1 byte, but a shift register is provided separately to allow data to be writ-
ten while the previous data is being sent. Always confirm that the transmit data buffer is empty before writing
transmission data. Writing data while the SPTBE flag is 0 will overwrite earlier transmission data inside the
transmit data buffer.
In Master mode, the SPBSY flag indicates the shift register status. This flag switches to 1 when transmission
data is loaded from the transmit data buffer to the shift register and reverts to 0 once the data is sent. Read this
flag to check whether the SPI module is operating or at standby.
The Slave mode SPBSY flag indicates the SPI slave selection signal (#SPISS pin) status. The flag has the value
1 when the SPI module is selected in Slave mode and the value 0 when the module is not selected.
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Data receipt control
In Master mode, dummy data is written to the SPI_TXD register (0x4322). Writing to the SPI TXD register cre-
ates the trigger for receipt as well as transmission start. Writing actual transmission data enables simultaneous
transfers.
This starts the SPI clock output from SPICLK.
In Slave mode, the module waits until the clock is input from SPICLK. Slave mode involves only data receipt.
There is no need to write to the SPI_TXD register if no transmission is required. The receiving operation is
started by clock input from the master device. If data is transferred simultaneously, the transmission data is
written to the SPI_TXD register before the clock is input.
The data is loaded into the shift register in sequence with the MSB leading at the clock rising or tailing edge, as
determined by CPHA (D3/SPI_CTL register) and CPOL (D2/SPI_CTL register) (see Figure 19.4.1).
The received data is loaded into the receive data buffer once the 8 bits of data are received in the shift register.
Received data in the buffer can be read from the SPI_RXD register (0x4324)
* SPI_RXD: SPI Receive Data Register (0x4324)
The SPI module includes an SPRBF flag (D1/SPI_ST register) for receipt control.
* SPRBF: Receive Data Buffer Full Flag in the SPI Status (SPI_ST) Register (D1/0x4320)
The SPRBF flag indicates the receive data buffer status. This flag is set to 1 when the data received in the shift
register is loaded into the receive data buffer, indicating that the receive data can be read out. It reverts to 0
when the buffer data is read out from the SPI_RXD register. An interrupt can be generated as soon as the flag is
set to 1 (see Section 19.6). The received data should be read out either by using this interrupt or by inspecting
the SPRBF flag to confirm that the receive data buffer contains valid receive data. The receive data buffer is 1
byte in size, but a shift register is also provided, enabling received data to be retained in the buffer even while
the subsequent data is being received. Note that the receive data buffer should be read out before receiving the
subsequent data is complete. If receiving the subsequent data is complete before the receive data buffer contents
are read out, the newly received data will overwrite the previous received data in the buffer.
In Master mode, the SPBSY flag indicating the shift register state can be used in the same way while transfer-
ring data.
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PCLK
SPEN
SPI_TXDx register
Shift register
SPICLKx pin
(CPOL = 0, CPHA = 1)
SPICLKx pin
(CPOL = 0, CPHA = 0)
SDOx
SDIx
SPI_RXD register
SPBSY
SPTBE
SPRBF
Write Write Write
Data A Data B Data C
AD7 AD6 AD5 AD4 AD3 AD2 AD1 AD0
A’D7 A’D6 A’D5 A’D4 A’D3 A’D2 A’D1 A’D0 B’D7 B’D6 B’D5 B’D4 B’D3 B’D2 B’D1 B’D0
BD7 BD6 BD5 BD4 BD3 BD2 BD1 BD0
Data A’ Data B’
ReadRead
Figure 19.5.1: Data Transmission/Receiving Timing Chart (MSB first)
Blocking data transfers
After a data transfer is completed (both transmission and reception), data transfers are blocked by writing 0 to
the SPEN bit. Confirm that the SPTBE flag is 1 and the SPBSY flag is 0 before blocking data transfer.
The data being transferred cannot be guaranteed if SPEN is set to 0 while data is being sent or received.
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19.6 SPI Interrupts
The SPI module includes a function for generating the following two different interrupt types.
• Transmit buffer empty interrupt
• Receive buffer full interrupt
The SPI module outputs one interrupt signal shared by the three above interrupt factor types to the interrupt con-
troller (ITC). Inspect the status flag to determine the interrupt factor occurring.
Transmit buffer empty interrupt
To use this interrupt, set SPTIE (D4/SPI_CTL register) to 1. If SPTIE is set to 0 (default), interrupt requests for
this factor will not be sent to the ITC.
∗
SPTIE: Transmit Data Buffer Empty Interrupt Enable Bit in the SPI Control (SPI_CTL) Register (D4/0x4326)
When transmission data written to the transmit data buffer is transferred to the shift register, the SPI module
sets the SPTBE bit (D0/SPI_ST register) to 1, indicating that the transmit data buffer is empty. If transmit buf-
fer empty interrupts are permitted (SPTIE = 1), an interrupt request pulse is sent simultaneously to the ITC.
∗ SPTBE: Transmit Data Buffer Empty Flag in the SPI Status (SPI_ST) Register (D0/0x4320)
An interrupt occurs if other interrupt conditions are met.
You can inspect the SPTBE flag in the SPI interrupt processing routine to determine whether the SPI interrupt
is attributable to a transmit buffer empty. If SPTBE is 1, the next transmission data can be written to the trans-
mit data buffer by the interrupt processing routine.
Receive buffer full interrupt
To use this interrupt, set SPRIE (D5/SPI_CTL register) to 1. If SPRIE is set to 0 (default), interrupt requests for
this factor will not be sent to the ITC.
∗ SPRIE: Receive Data Buffer Full Interrupt Enable Bit in the SPI Control (SPI_CTL) Register (D5/0x4326)
When data received in the shift register is loaded into the receive data buffer, the SPI module sets the SPRBF
bit (D1/SPI_ST register) to 1, indicating that the receive data buffer contains readable received data. If receive
buffer full interrupts are permitted (SPRIE = 1), an interrupt request pulse is output to the ITC at the same time.
∗ SPRBF: Receive Data Buffer Full Flag in the SPI Status (SPI_ST) Register (D1/0x4320)
An interrupt occurs if other interrupt conditions are met.
You can inspect the SPRBF flag in the SPI interrupt processing routine to determine whether the SPI interrupt
is attributable to a receive buffer full. If SPRBF is 1, the received data can be read from the receive data buffer
by the interrupt processing routine.
SPI interrupt ITC registers
The control bits for the SPI module in the ITC are listed below.
Interrupt flag
∗ IIFT6: SPI Interrupt Flag in the Interrupt Flag (ITC_IFLG) Register (D14/0x4300)
Interrupt enable bit
∗ IIEN6: SPI Interrupt Enable Bit in the Interrupt Enable (ITC_EN) Register (D14/0x4302)
Interrupt level setting bit
∗ IILV6[2:0]: SPI Interrupt Level Bits in the Internal Interrupt Level Setup (ITC_ILV3) Register 3 (D[2:0]/0x4314)
If an interrupt request pulse is output by the SPI module, the IIFT6 interrupt flag is set to 1.
If the IIEN6 interrupt enable bit is set to 1, the ITC sends an interrupt request to the S1C17 core. To prohibit
SPI interrupts, set IIEN6 to 0.
The IIFT6 flag is set to 1 by a SPI interrupt request pulse, regardless of the IIEN6 bit setting (i.e., even if set to 0).
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The IILV6[2:0] interrupt level setting bit sets the SPI interrupt level (0 to 7).
The S1C17 core accepts interrupts when all of the following conditions are met:
• The interrupt enable bit is set to 1.
• The PSR (S1C17 core internal processor status register) IE (interrupt enable) bit is set to 1.
• The SPI interrupt has a higher interrupt level set than that set for the PSR IL (interrupt level).
• No other interrupt factors having higher precedence (e.g., NMI) are present.
For detailed information on these interrupt registers and operations when interrupts occur, refer to “6 Interrupt
Controller (ITC).”
Interrupt vectors
The SPI interrupt vector numbers and vector addresses are as listed below.
Vector number: 18 (0x12)
Vector address: 0x8040
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19.7 Control Register Details
Table 19.7.1: SPI register list
Address Register name Function
0x4320 SPI_ST SPI Status Register Transfer, buffer status display
0x4322 SPI_TXD SPI Transmit Data Register Transmission data
0x4324 SPI_RXD SPI Receive Data Register Received data
0x4326 SPI_CTL SPI Control Register SPI mode and data transfer permission setting
The SPI registers are described in detail below. These are 16-bit registers.
Note: • When data is written to the registers, the “Reserved” bits must always be written as 0 and not 1.
• Always use 16-bit access commands to read and write to/from the SPI register. 32-bit and 8-bit
access commands cannot be used to read and write to/from the SPI register.
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0x4320: SPI Status Register (SPI_ST)
Register name Address Bit Name Function Setting Init. R/W Remarks
SPI Status Reg-
ister
(SPI_ST)
0x4320
(16 bits)
D15–3 –reserved – – – 0 when being read.
D2 SPBSY Transfer busy flag (master) 1 Busy 0 Idle 0 R
ss signal low flag (slave) 1 ss = L 0 ss = H
D1 SPRBF Receive data buffer full flag 1 Full 0 Not full 0 R
D0 SPTBE Transmit data buffer empty flag 1 Empty 0 Not empty 1 R
D[15:3] Reserved
D2 SPBSY: Transfer Busy Flag (Master Mode)/ss Signal Low Flag (Slave Mode)
Master mode
Indicates the SPI transfer status.
1 (R): Operating
0 (R): Standby (default)
SPBSY is set to 1 when the SPI starts data transfer in Master mode and is maintained at 1 while transfer
is underway.
It is cleared to 0 once the transfer is complete.
Slave mode
Indicates the slave selection (#SPISS) signal status.
1 (R): Low level (this SPI is selected)
0 (R): High level (this SPI is not selected) (default)
SPBSY is set to 1 when the master device sets the #SPISS signal to active to select this SPI module
(slave device). It is returned to 0 when the master device clears the SPI module selection by returning
the #SPISS signal to inactive.
D1 SPRBF: Receive Data Buffer Full Flag
Indicates the receive data buffer status.
1 (R): Data full
0 (R): No data (default)
SPRBF is set to 1 when data received in the shift register is sent to the receive data buffer (when receiv-
ing is complete), indicating that the data can be read. It reverts to 0 once the buffer data is read from the
SPI_RXD register (0x4324).
D0 SPTBE: Transmit Data Buffer Empty Flag
Indicates the state of the transmit data buffer.
1 (R): Empty (default)
0 (R): Data exists
SPTBE is set to 0 when transmit data is written to the SPI_TXD register (transmit data buffer, 0x4322),
and is set to 1 when the data is transferred to the shift register (when transmission starts).
Transmission data is written to the SPI_TXD register when this bit is 1.
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0x4322: SPI Transmit Data Register (SPI_TXD)
Register name Address Bit Name Function Setting Init. R/W Remarks
SPI Transmit
Data Register
(SPI_TXD)
0x4322
(16 bits)
D15–8 –reserved – – – 0 when being read.
D7–0 SPTDB[7:0] SPI transmit data buffer
SPTDB7 = MSB
SPTDB0 = LSB
0x0 to 0xff 0x0 R/W
D[15:8] Reserved
D[7:0] SPTDB[7:0]: SPI Transmit Data Buffer Bits
Set the transmission data to be written to the transmit data buffer. (Default: 0x0)
In Master mode, transmission is started by writing data to this register. In Slave mode, the contents of
this register are sent to the shift register and transmission begins when the clock is input from the mas-
ter.
SPTBE (D0/SPI_ST register) is set to 1 (empty) as soon as data written to this register has been trans-
ferred to the shift register. A transmit buffer empty interrupt is generated at the same time. The subse-
quent transmit data can then be written, even while data is being transmitted.
Serial converted data is output from the SDO pin with MSB leading, with the bit set to 1 as High level
and the bit set to 0 as Low level.
Note: Make sure that SPEN is set to 1 before writing data to the SPI_TXD register to start data transmis-
sion/reception.
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0x4324: SPI Receive Data Register (SPI_RXD)
Register name Address Bit Name Function Setting Init. R/W Remarks
SPI Receive
Data Register
(SPI_RXD)
0x4324
(16 bits)
D15–8 –reserved – – – 0 when being read.
D7–0 SPRDB[7:0] SPI receive data buffer
SPRDB7 = MSB
SPRDB0 = LSB
0x0 to 0xff 0x0 R
D[15:8] Reserved
D[7:0] SPRDB[7:0]: SPI Receive Data Buffer Bits
Contain the received data. (Default: 0x0)
SPRBF (D1/SPI_ST register) is set to 1 (data full) as soon as data is received and the shift register data
has been transferred to the receive data buffer. A receive buffer full interrupt is generated at the same
time. Data can then be read until subsequent data is received. If receiving the subsequent data is com-
plete before the register has been read out, the new received data overwrites the contents.
Serial data input from the SDI pin with MSB leading is converted to parallel, with the High level bit set
to 1 and the Low level bit set to 0. The data is the loaded into this register.
This register is read-only.
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0x4326: SPI Control Register (SPI_CTL)
Register name Address Bit Name Function Setting Init. R/W Remarks
SPI Control
Register
(SPI_CTL)
0x4326
(16 bits)
D15–6 –reserved – – – 0 when being read.
D5 SPRIE Receive data buffer full int. enable 1 Enable 0 Disable 0 R/W
D4 SPTIE Transmit data buffer empty int.
enable
1 Enable 0 Disable 0 R/W
D3 CPHA Clock phase select 1 Data out 0 Data in 0 R/W These bits must be
set before setting
SPEN to 1.
D2 CPOL Clock polarity select 1 Active L 0 Active H 0 R/W
D1 MSSL Master/slave mode select 1 Master 0 Slave 0 R/W
D0 SPEN SPI enable 1 Enable 0 Disable 0 R/W
D[15:6] Reserved
D5 SPRIE: Receive Data Buffer Full Interrupt Enable Bit
D5 SPRIE: Receive Data Buffer Full Interrupt Enable Bit
Permits or prohibits receive data buffer full SPI interrupts.
1 (R/W): Permitted
0 (R/W): Prohibited (default)
Setting SPRIE to 1 permits the output of SPI interrupt requests to the ITC due to a receive data buffer
full. These interrupt requests are generated when the data received in the shift register is transferred to
the receive data buffer (when receipt is complete).
SPI interrupts are not generated by receive data buffer full if SPRIE is set to 0.
D4 SPTIE: Transmit Data Buffer Empty Interrupt Enable Bit
Permits or prohibits transmit data buffer empty SPI interrupts.
1 (R/W): Permitted
0 (R/W): Prohibited (default)
Setting SPTIE to 1 permits the output of SPI interrupt requests to the ITC due to a transmit data buffer
empty. These interrupt requests are generated when the data written to the transmit data buffer is trans-
ferred to the shift register (when transmission starts).
SPI interrupts are not generated by transmit data buffer empty if SPTIE is set to 0.
D3 CPHA: SPI Clock Phase Select Bit
Selects the SPI clock phase. (Default: 0)
Sets the data transfer timing together with CPOL (D2). (See Figure 19.7.1.)
D2 CPOL: SPI Clock Polarity Select Bit
Selects the SPI clock polarity.
1 (R/W): Active Low
0 (R/W): Active High (default)
Sets the data transfer timing together with CPHA (D3). (See Figure 19.7.1.)
SPICLK(CPOL = 1, CPHA = 1)
SPICLK(CPOL = 1, CPHA = 0)
SPICLK(CPOL = 0, CPHA = 1)
SPICLK(CPOL = 0, CPHA = 0)
SDI/SDO
Receive data load timing
to shift register
D7 (MSB) D0 (LSB)
Figure 19.7.1: Clock and data transfer timing
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D1 MSSL: Master/Slave Mode Select Bit
Sets the SPI module to Master or Slave mode.
1 (R/W): Master mode
0 (R/W): Slave mode (default)
Setting MSSL to 1 selects Master mode; setting it to 0 selects Slave mode. Master mode performs data
transfer with the clock generated by the 16-bit timer Ch.1. In Slave mode, data is transferred by input-
ting the clock from the master device.
D0 SPEN: SPI Enable Bit
Permits or prohibits SPI module operation.
1 (R/W): Permitted
0 (R/W): Prohibited (default)
Setting SPEN to 1 starts the SPI module operation, enabling data transfer.
Setting SPEN to 0 stops the SPI module operation.
Note: The SPEN bit should be set to 0 before setting the CPHA, CPOL, and MSSL bits.
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19.8 Precautions
• Always use 16-bit access commands to read and write to/from the SPI register (0x4320 to 0x4326). 32-bit and
8-bit access commands cannot be used to read and write to/from the SPI register.
• Do not access the SPI_CTL register (0x4326) while the SPBSY flag (D2/SPI_ST register) is set to 1 (while data
is being transferred).
* SPBSY: Transfer Busy Flag in the SPI Status (SPI_ST) Register (D2/0x4320)
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20I2C
20.1 I2C Configuration
The S1C17001 incorporates an I2C bus interface module for high-speed synchronized serial communications. The
I2C module operates as a master device (as single master only) using the clock fed from the 16-bit timer Ch.2. It
supports standard (100 kbps) and fast (400 kbps) modes as well as 7-bit/10-bit slave address mode. It incorporates
a noise filter function to help improve the reliability of data transfers.
This module is capable of generating two different types of interrupts (transmit buffer empty and receive buffer full
interrupts) for easy and continuous processing of serial data transfers with interrupts.
Figure 20.1.1 shows the I2C module configuration.
Shift register SDA
SDA
SCL
SCL
I2C clock
(from 16-bit timer Ch.2)
Internal bus
ITC
I2C
Bus I/F
and
control
register
Shift register
Clock/transfer control
Noise
filter
Interrupt
control
Figure 20.1.1: I2C module configuration
Note: This I2C module does not include a cross-stretch function and does not support I2C slave de-
vices that synchronize communications by cross-stretching.
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20.2 I2C Input/Output Pins
Table 20.2.1 lists the I2C pins.
Table 20.2.1: I2C pin list
Pin name I/O Qty Function
SDA (P14) I/O 1 I2C data input/output pin
Inputs serial data from the I2C bus.
Also outputs serial data to the I2C bus.
SCL (P15) I/O 1 I2C clock input/output pin
Inputs SCL line status.
Also outputs a serial clock.
The I2C input/output pins (SDA, SCL) are shared with general purpose input/output port pins (P14, P15) and are
initially set as general purpose input/output port pins. The function must be switched using the P1_PMUX register
setting to use general purpose input/output port pins as I2C input/output pins. Switch the pins to I2C mode by set-
ting the following control bits to 1.
P14 → SDA
* P14MUX: P14 Port Function Select Bit in the P1 Port Function Select (P1_PMUX) Register (D4/0x52a1)
P15 → SCL
* P15MUX: P15 Port Function Select Bit in the P1 Port Function Select (P1_PMUX) Register (D5/0x52a1)
For detailed information on pin function switching, refer to “10.2 Input/Output Pin Function Selection (Port
MUX).”
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20.3 I2C Clock
The I2C module uses the internal clock output by the 16-bit timer Ch.2 as the synchronizing clock. This clock is
output from the SCL pin to the slave device while also driving the shift register. The clock should be programmed
to output a signal matching the transfer rate from the 16-bit timer Ch.2. For more information on 16-bit timer con-
trol, refer to “11 16-bit Timer (T16).”
The I2C module does not function as a slave device. The SCL input pin is used to check the I2C bus SCL signal sta-
tus. It is not used for synchronization clock input.
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20.4 Settings Before Data Transfer
The I2C module includes an optional noise filter function that can be selected via the application program.
Noise filter function
The I2C module incorporates a function for filtering noise from the SDA and SCL pin input signals. This func-
tion is enabled by setting NSERM (D4/I2C_CTL register) to 1.
Note that using this function requires setting the I2C clock (16-bit timer Ch.2 output clock) frequency to 1/6 or
less of PCLK.
* NSERM: Noise Remove On/Off Bit in the I2C Control (I2C_CTL) Register (D4/0x4342)
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20.5 Data Transfer Control
Make the following settings before starting data transfers.
(1) Set the 16-bit timer Ch.2 to output the I2C clock. (See Section 11.)
(2) Select the option function. (See section 20.4.)
(3) Set the interrupt conditions to use I2C interrupts. (See Section 20.6.)
Note: Make sure the I2C module is halted (when I2CEN/I2C_EN register = 0) before changing the
above settings.
* I2CEN: I2C Enable Bit in the I2C Enable (I2C_EN) Register (D0/0x4340)
Permitting data transfers
Set the I2CEN (D0/I2C_EN register) to 1 to permit I2C operations. This enables I2C transfers and permits clock
input/output.
Note: Do not set I2CEN to 0 when the I2C module is transferring data.
Data transfer start
To start data transfers, the I2C master (this module) must generate the start condition. The slave address is then
sent to establish communications.
(1) Register setting procedure
To generate a START condition, set the following registers in the order shown below:
1. Set the slave address to RTDT[7:0] (D[7:0]/I2CM_DAT register).
2. Set TXE (D9/I2CM_DAT register) to 1.
3. Set STRT (D0/I2CM_CTL register) to 1.
* RTDT[7:0]: Receive/Transmit Data Bits in the I2C Master Data (I2CM_DAT) Register (D[7:0]/0x4344)
* TXE: Transmit Execution Bit in the I2C Master Data (I2CM_DAT) Register (D9/0x4344)
* STRT: Start Control Bit in the I2C Master Control (I2CM_CTL) Register (D0/0x4342)
This procedure generates the communication waveforms as shown in Items (2) and (3) below. Be sure to follow
the register setting procedure.
(2) Generate start condition
The start condition applies when the SCL line is maintained at High and the SDA line is maintained at Low.
SDA (output)
SCL (output)
Start condition
Figure 20.5.1: Start condition
The start condition is generated by setting STRT (D0/I2C_CTL register) to 1.
* STRT: Start Control Bit in the I2C Control (I2C_CTL) Register (D0/0x4342)
STRT is automatically reset to 0 once the start condition is generated.
(3) Slave address transmission
Once the start condition has been generated, the I2C master (this module) sends a bit indicating the slave ad-
dress and transfer direction for communications. I2C slave addresses are either 7-bit or 10-bit. This module uses
an 8-bit transfer data register to send the slave address and transfer direction bit, enabling single transfers in
7-bit address mode. In 10-bit mode, data is sent twice or three times under software control. Figure 20.5.2 gives
the configuration of the address data.
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Third transmit data
(When receiving data)
Issue a repeated start after the second data has been sent and then send the third data as shown below.
D7 D6 D5 D4 D3 D2 D1
1
D0
Slave address
7-bit address
Transfer direction
0: master → slave (transmission)
1: slave → master (reception)
A6 A5
D7 D6
A4
D5
A3
D4
A2
D3
A1
D2
A0
A6 A5 A4 A3 A2 A1 A0
D1
DIR
D0
Slave address
8 low order slave address bits
A7 A6
D7 D6
A5
D5
A4
D4
A3
D3
A2
D2
A1
D1
A0
D0
2 high order
slave address bits
10-bit address
1First transmit data
Second transmit data
1
D7 D6
1
D5
1
D4
0
D3
A9
D2
A8
D1
0
D0
Figure 20.5.2: Slave address and transmission data specifying transfer direction
Transfer direction indicates the data transfer direction after the slave address. This is set to 0 when sending data
from the master to the slave and to 1 when receiving data from the slave.
Transmission is controlled as described below by setting the 8-bit data created as described above to the trans-
fer data register.
The slave address and transfer direction bits can be sent only once after generating the start condition. After the
slave address has been output, data can be sent and received as many times as required. Data must be sent or
received according to the transfer direction set together with the slave address.
Data transmission control
The procedure for transmitting data is described below. Slave address transmission involves the same proce-
dure.
To send byte data, set the transmission data to RTDT[7:0] (D[7:0]/I2C_DAT register). Set TXE (D9/I2C_DAT
register) to 1 to transmit 1 byte.
* RTDT[7:0]: Receive/Transmit Data Bits in the I2C Data (I2C_DAT) Register (D[7:0]/0x4344)
* TXE: Transmit Execution Bit in the I2C Data (I2C_DAT) Register (D9/0x4344)
When TXE is set to 1, the I2C module begins data transmission in sync with the clock. If the start condition or
previous data is currently being transmitted, data transmission starts after this has been completed.
The I2C module first transfers the data written to the shift register, then starts outputting the clock from SCL.
Resetting TXE to 0 at this point generates an interrupt, enabling the subsequent transmission data and TXE to
be reset.
The data bits in the shift register are shifted in sequence at the clock falling edge and output via the SDA pin
with the MSB leading.
The I2C module outputs 9 clocks with each data transmission. In the 9th clock cycle, an ACK or NACK is re-
ceived from the slave device with the SDA signal as high impedance.
The slave device returns ACK(0) to the master if the data is received. If the data is not received, SDA is not
pulled down, which the I2C module interprets to mean an NACK(1) (transmission failed).
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SDA (output)
SDA (input)
SCL (output)
Start condition
1 2 8 9
D7 D6 D0
ACK
NACK
Figure 20.5.3: ACK and NACK
The I2C module includes two status bits, TBUSY (D8/I2C_CTL register) and RTACK (D8/I2C_DAT register),
for transmission control.
* TBUSY: Transmit Busy Flag in the I2C Control (I2C_CTL) Register (D8/0x4342)
* RTACK: Receive/Transmit ACK Bit in the I2C Data (I2C_DAT) Register (D8/0x4344)
The TBUSY flag indicates the data transmission status. This flag becomes 1 when transmission starts (including
slave address transmission) and reverts to 0 once data transmission ends. It also reverts to 0 for Wait state.
Inspect the flag to check whether the I2C module is currently transmitting or at standby.
The RTACK bit indicates whether or not the slave device returned an ACK for the previous transmission.
RTACK is 0 if an ACK was returned and 1 if ACK was not returned.
Data receipt control
The procedure for receiving data is described below. The start condition must first be generated before receiv-
ing data, and the slave address sent with the transfer direction bit set to 1.
To receive data, set RXE (D10/I2C_DAT register) to 1 for receiving 1 byte.
TXE (D9/I2C_DAT register) is set to 1 when sending the slave address, but RXE can also be set to 1 at the
same time. If both TXE and RXE are set to 1, TXE takes priority.
* RXE: Receive Execution Bit in the I2C Data (I2C_DAT) Register (D10/0x4344)
When the RXE bit is set to 1, allowing receiving to start, the I2C module starts outputting the clock from the
SCL pin with the SDA line at high impedance. The data is loaded to the shift register in sequence at the clock
rising edge, with the MSB leading.
RXE is reset to 0 when D6 is loaded.
The receive data is loaded to RTDT[7:0] once the 8-bit data has been received in the shift register. The I2C
module includes two status bits for receive control: RBRDY (D11/I2C_DAT register) and RBUSY (D9/
I2C_CTL register).
* RBRDY: Receive Buffer Ready Bit in the I2C Data (I2C_DAT) Register (D11/0x4344)
* RBUSY: Receive Busy Flag in the I2C Control (I2C_CTL) Register (D9/0x4342)
The RBRDY flag indicates the receive data status. This flag becomes 1 when the data received in the shift
register is loaded to RTDT[7:0] and reverts to 0 when the receive data is read out from RTDT[7:0]. Interrupts
can also be generated once the flag value becomes 1, so either use this interrupt or read the receive data to
determine the presence of valid receive data in RTDT[7:0] by inspecting the RBRDY flag. If the subsequent
data is received before RTDT[7:0] is read out, the newly received data overwrites the data already received in
RTDT[7:0].
The RBUSY flag indicates the receiving operation status. This flag is 1 when receiving starts and reverts to 0
when the data is received. It also reverts to 0 for the Wait state. Inspect the flag to determine whether the I2C
module is currently receiving or in standby.
The I2C module outputs nine clocks for one data transmission. In the 9th clock cycle, 0 or 1 set to RTACK(D8/
I2C_DAT register) is sent from the SDA pin to the slave as ACK, NACK response, respectively. Do not change
RTACK while ACK or NACK is in response.
Note: Receive buffer full interrupt occurs when ACK/NACK is in response (the 9th clock cycle). When
the RTACK setting is rewritten without waiting for the end of the ACK/NACK period immediately
after this interrupt is occured, ACK/NACK response output to the SDA pin is changed during the
response time, the correct communication can not be performed.
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Data transfer end (Stop condition generation)
To end data transfers after all data has been transferred, the I2C master (this module) must generate a stop con-
dition. This stop condition applies when the SCL line is maintained at High and the SDA line changes from
Low to High.
SDA (output)
SCL (output)
Stop condition
Figure 20.5.4: Stop condition
The stop condition is generated by setting STP (D1/I2C_CTL register) to 1.
* STP: Stop Control Bit in the I2C Control (I2C_CTL) Register (D1/0x4342)
The stop condition described above is generated if STP is 1 and TXE (D9/I2C_register), RXE (D10/I2C_DAT
register), and STRT (D0/I2C_CTL register) are set to 0 when data transfer is complete (including ACK trans-
fer). The I2C bus will then be free. STP is automatically reset to 0 if the stop condition is generated.
STP will be disabled if any of TXE, RXE, or STRT is 1.
The I2C module does not support repeated start condition. The stop condition cannot be omitted before generat-
ing the start condition for the subsequent data transfer.
Wait state for TXE, RXE, STRT, and STP settings
The module will switch to Wait state with the SCL output fixed at Low if all of the TXE (D9/I2C_DAT regis-
ter), RXE (D10/I2C_DAT register), STRT (D0/I2C_CTL register), and STP (D1/I2C_CTL register) bits are 0
on completion of transfer for 1 byte of data and the ACK. This state is canceled either by writing 1 to TXE or
RXE to restart data transfer or by generating the stop condition with STP.
Prohibiting data transfer
After the stop condition has been generated, write 0 to I2CEN to disable data transfers. To determine whether the
stop condition has been generated, check to see if STP is automatically cleared to 0 after it is set to 1 by polling.
When I2CMEN is set to 0 while the I2C bus is in busy status, the SCL0 and SDA0 output levels and transfer data
at that point cannot be guaranteed.
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Timing chart
PCLK
T16 Ch.2 output
SCL (input)
SCL (output)
SDA (input)
SDA (output)
STRT
STP
TXE
RXE
TBUSY
RBUSY
RBRDY
RTACK
Shift register
RTDT[7:0]
Interrupt
A6
valid shift valid shiftshift shift shift shift shift shift
A[6:0] + DIR
D[7:0]
A5 A4 A3 A2 A1 A0 D7 D6
(ACK received)
DIR = 0
ACK
Register settings
Start communication Start transmission Start transmissionSet transmit data and TXE
START
condition
Slave address transmission Data transmission
ACK reception
Figure 20.5.5: I2C timing chart 1 (Start condition à Data transmission)
PCLK
T16 Ch.2 output
SCL (input)
SCL (output)
SDA (input)
SDA (output)
STRT
STP
TXE
RXE
TBUSY
RBUSY
RBRDY
RTACK
Shift register
RTDT[7:0]
Interrupt
D0
valid shift shift shift shift shift shift shiftshift
D5 D4 D3 D2 D1 D0D7 D6
D[7:0]
(ACK receipt)
ACK ACK
ACK receipt
Transmission end
Transmission start Stop
condition
Data continuous transmission
ACK receipt
(ACK receipt)
Figure 20.5.6: I2C timing chart 2 (Data transmission à Stop condition)
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PCLK
T16 Ch.2 output
SCL (input)
SCL (output)
SDA (input)
SDA (output)
STRT
STP
TXE
RXE
TBUSY
RBUSY
RBRDY
RTACK
Shift register
RTDT[7:0]
Interrupt
A6
valid shift shift shiftshift shift shift shift shift shift
A[6:0] + DIR
A5 A4 A3 A2 A1 A0
D7 D6
DIR = 1
ACK
Register settings
Start communication Start transmission Start reception
START
condition
Slave address transmission Data reception
ACK reception
(ACK received)
Figure 20.5.7: I2C timing chart 3 (Start condition ➔ Data receipt)
PCLK
T16 Ch.2 output
SCL (input)
SCL (output)
SDA (input)
SDA (output)
STRT
STP
TXE
RXE
TBUSY
RBUSY
RBRDY
RTACK
Shift register
RTDT[7:0]
Interrupt
D0
shift shift shift shift shift shift shift validvalidshift
D5 D4 D3 D2 D1 D0D7 D6
(ACK to transmit)
Cleared by reading RTDT[7:0]
(NAK to transmit)
D[7:0] D[7:0]
ACK
NACK transmission
Terminate reception
Interrupt generation STOP
condition
Continuous data reception
ACK transmission
NAK
Figure 20.5.8: I2C timing chart 4 (Data receipt ➔ Stop condition)
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PCLK
T16 Ch.2 output
SCL (input)
SCL (output)
SDA (input)
SDA (output)
STRT
STP
TXE
RXE
TBUSY
RBUSY
RBRDY
RTACK
Shift register
RTDT[7:0]
Interrupt
A6
valid shift valid shiftshiftshift shift
A[6:0] + DIR
D[7:0]
A5 A0 D6D7 D5
STRT = 0
STP = 0
TXE = 0
RXE = 0
ACK
Start communication
Interrupt generation
Start transmission
Interrupt generation
Set transmit data and TXE
Register settings
Slave address transmission Data transmissionWait
ACK reception
DIR = 0
Fixed at 0
(ACK received)
Figure 20.5.9: I2C timing chart 5 (Wait)
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20.6 I2C Interrupts
The I2C module includes a function for generating the following two different interrupt types.
• Transmit buffer empty interrupt
• Receive buffer full interrupt
The I2C module outputs one interrupt signal shared by the two above interrupt factor types to the interrupt control-
ler (ITC).
Transmit buffer empty interrupt
To use this interrupt, set TINTE (D0/I2C_ICTL register) to 1. If TINTE is set to 0 (default), interrupt requests
for this factor will not be sent to the ITC.
* TINTE: Transmit Interrupt Enable Bit in the I2C Interrupt Control (I2C_ICTL) Register (D0/0x4346)
If transmit buffer empty interrupts are permitted (TINTE = 1), an interrupt request pulse is output to the ITC as
soon as the transmit data set in RTDT[7:0] (D[7:0]/I2C_DAT register) is transferred to the shift register.
* RTDT[7:0]: Receive/Transmit Data Bits in the I2C Data (I2C_DAT) Register (D[7:0]/0x4344)
An interrupt occurs if other interrupt conditions are satisfied.
Transmit buffer empty interrupt occurs when the data was only sent.
• The clear method of transmit buffer empty flag
Write the data to RTDT/I2CM_DAT.
When TXE/I2CM_DAT is 0, the data doesn’t send and the flag is only cleared.
Receive buffer full interrupt
To use this interrupt, set RINTE (D1/I2C_ICTL register) to 1. If RINTE is set to 0 (default), interrupt requests
for this factor will not be sent to the ITC.
* RINTE: Receive Interrupt Enable Bit in the I2C Interrupt Control (I2C_ICTL) Register (D1/0x4346)
If receive buffer full interrupts are permitted (RINTE = 1), an interrupt request pulse is output to the ITC as
soon as the data received in the shift register is loaded to RTDT[7:0].
An interrupt occurs if other interrupt conditions are met.
Receive buffer full interrupt occurs when the data was only received.
• The clear method of receive buffer full flag
Read the data from RTDT/I2CM_DAT.
Note: When I2CM interrupt occurs, decide the transmit buffer empty interrupt or the receive buffer full
interrupt by the program sequence of the I2C master. There’re not registers to decide which inter-
rupt occurred.
I2C interrupt ITC registers
The control bits for the I2C module in the ITC are listed below.
Interrupt flag
* IIFT7: I2C Interrupt Flag in the Interrupt Flag (ITC_IFLG) Register (D15/0x4300)
Interrupt enable bit
* IIEN7: I2C Interrupt Enable Bit in the Interrupt Enable (ITC_EN) Register (D15/0x4302)
Interrupt level setting bit
* IILV7[2:0]: I2C Interrupt Level Bits in the Internal Interrupt Level Setup (ITC_ILV3) Register 3 (D[10:8]/0x4314)
If an interrupt request pulse is output by the I2C module, the IIFT7 interrupt flag is set to 1.
If the IIEN7 interrupt enable bit is set to 1, the ITC sends an interrupt request to the S1C17 core. To prohibit
I2C interrupts, set IIEN7 to 0.
The IIFT7 flag is set to 1 by a I2C interrupt request pulse, regardless of the IIEN7 bit setting (i.e., even if set to 0).
The IILV7[2:0] interrupt level setting bit sets the I2C interrupt level (0 to 7).
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The S1C17 core accepts interrupts when all of the following conditions are met:
• The interrupt enable bit is set to 1.
• The PSR (S1C17 core internal processor status register) IE (interrupt enable) bit is set to 1.
• The I2C interrupt has a higher interrupt level set than that set for the PSR IL (interrupt level).
• There are no other interrupt factors, including NMI, with higher priority.
For detailed information on these interrupt registers and operations when interrupts occur, refer to “6 Interrupt
Controller (ITC).”
Interrupt vectors
The I2C interrupt vector numbers and vector addresses are as listed below.
Vector number: 19 (0x13)
Vector address: 0x804c
20.7 Control Register Details
Table 20.7.1: I2C register list
Address Register name Function
0x4340 I2C_EN I2C Enable Register I2C module enable
0x4342 I2C_CTL I2C Control Register I2C control and transfer status display
0x4344 I2C_DAT I2C Data Register Transfer data
0x4346 I2C_ICTL I2C Interrupt Control Register I2C interrupt control
The I2C module registers are described in detail below. These are 16-bit registers.
Note: • When data is written to the registers, the “Reserved” bits must always be written as 0 and not 1.
• Always use 16-bit access commands to read and write to/from the I2C register. 32-bit and 8-bit
access commands cannot be used to read and write to/from the I2C register.
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0x4340: I2C Enable Register (I2C_EN)
Register name Address Bit Name Function Setting Init. R/W Remarks
I2C Enable Reg-
ister
(I2C_EN)
0x4340
(16 bits)
D15–1 –reserved – – – 0 when being read.
D0 I2CEN I2C enable 1 Enable 0 Disable 0 R/W
D[15:1] Reserved
D0 I2CEN: I2C Enable Bit
Permits or prohibits I2C module operation.
1 (R/W): Permitted
0 (R/W): Prohibited (default)
Setting I2CEN to 1 starts the I2C module operation, enabling data transfer.
Setting I2CEN to 0 stops the I2C module operation.
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0x4342: I2C Control Register (I2C_CTL)
Register name Address Bit Name Function Setting Init. R/W Remarks
I2C Control
Register
(I2C_CTL)
0x4342
(16 bits)
D15–10 –reserved – – – 0 when being read.
D9 RBUSY Receive busy flag 1 Busy 0 Idle 0 R
D8 TBUSY Transmit busy flag 1 Busy 0 Idle 0 R
D7–5 –reserved – – – 0 when being read.
D4 NSERM Noise remove on/off 1 On 0 Off 0 R/W
D3–2 –reserved – – – 0 when being read.
D1 STP Stop control 1 Stop 0 Ignored 0 R/W
D0 STRT Start control 1 Start 0 Ignored 0 R/W
D[15:10] Reserved
D9 RBUSY: Receive Busy Flag
Indicates the I2C receipt status.
1 (R): Operating
0 (R): Standby (default)
RBUSY is set to 1 when the I2C starts data receiving and is maintained at 1 while receiving is under-
way. It is cleared to 0 once receipt is complete or in Wait state.
D8 TBUSY: Transmit Busy Flag
Indicates the I2C transmission status.
1 (R): Operating
0 (R): Standby (default)
TBUSY is set to 1 when the I2C starts data transmission and is maintained at 1 while transmission is
underway. It is cleared to 0 once transmission is complete. It is also returned to 0 in Wait state.
D[7:5] Reserved
D4 NSERM: Noise Remove On/Off Bit
Turns the noise filter function on or off.
1 (R/W): On
0 (R/W): Off (default)
The I2C module incorporates a function for filtering noise from the SDA and SCL pin input signals.
This function is enabled by setting NSERM to 1.
Note that using this function requires setting the I2C clock (16-bit timer Ch.2 output clock) frequency to
1/6 or less of PCLK.
D[3:2] Reserved
D1 STP: Stop Control Bit
Generates the stop condition.
1 (R/W): Stop condition generated
0 (R/W): Disabled (default)
With STP set at 1, the I2C module generates the stop condition by changing the SDA line from Low to
High while maintaining the I2C bus SCL line at High. The I2C bus subsequently becomes free.
Note that the stop condition will be generated only if STP is 1 and TXE (D9/I2C_DAT register), RXE
(D10/I2C_DAT register), and STRT (D0) are set to 0 when data transfer is complete (including ACK
transfer). STP is disabled if any of TXE, RXE, or STRT is 1.
STP is automatically reset to 0 if the stop condition is generated.
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D0 STRT: Start Control Bit
Generates the start condition.
1 (R/W): Start condition generated
0 (R/W): Disabled (default)
With STRT set at 1, the I2C module generates the start condition by changing the SDA line to Low
while maintaining the I2C bus SCL line at High. The I2C bus subsequently becomes busy.
Set STRT to 1 when data transfer starts.
To generate a START condition, set the following registers in the order shown below:
1. Set the slave address to RTDT[7:0] (D[7:0]/I2CM_DAT register).
2. Set TXE (D9/I2CM_DAT register) to 1.
3. Set STRT to 1.
STRT is automatically reset to 0 once the start condition is generated.
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0x4344: I2C Data Register (I2C_DAT)
Register name Address Bit Name Function Setting Init. R/W Remarks
I2C Data
Register
(I2C_DAT)
0x4344
(16 bits)
D15–12 –reserved – – – 0 when being read.
D11 RBRDY Receive buffer ready 1 Ready 0 Empty 0 R
D10 RXE Receive execution 1 Receive 0 Ignored 0 R/W
D9 TXE Transmit execution 1 Transmit 0 Ignored 0 R/W
D8 RTACK Receive/transmit ACK 1 Error 0 ACK 0 R/W
D7–0 RTDT[7:0] Receive/transmit data
RTDT7 = MSB
RTDT0 = LSB
0x0 to 0xff 0x0 R/W
D[15:12] Reserved
D11 RBRDY: Receive Buffer Ready Flag
Indicates the receive buffer status.
1 (R): Receive data exists
0 (R): No receive data (default)
The RBRDY flag becomes 1 when the data received in the shift register is loaded to RTDT[7:0] (D[7:0])
and reverts to 0 when the receive data is read out from RTDT[7:0]. Interrupts can also be generated
once the flag value becomes 1, so either use this interrupt or read the receive data to determine the pres-
ence of valid receive data in RTDT[7:0] by inspecting the RBRDY flag before reading out the receive
data.
D10 RXE: Receive Execution Bit
Receives 1 byte of data.
1 (R/W): Data receipt start
0 (R/W): Disabled (default)
Setting RXE to 1 and TXE (D9) to 0 starts receiving for 1 byte of data. RXE can be set to 1 for subse-
quent receipt, even if the slave address is being sent or data is being received. RXE is reset to 0 as soon
as D6 is loaded to the shift register.
D9 TXE: Transmit Execution Bit
Transmits 1 byte of data.
1 (R/W): Data transmission start
0 (R/W): Disabled (default)
Transmission is started by setting the transmission data to RTDT[7:0] (D[7:0]) and writing 1 to TXE.
TXE can be set to 1 for subsequent transmission, even if the slave address or data is being sent. TXE is
reset to 0 as soon as the data set in RTDT[7:0] is transferred to the shift register.
D8 RTACK: Receive/Transmit ACK Bit
When transmitting data
Indicates the response bit status.
1 (R/W): Error (NACK)
0 (R/W): ACK (default)
RTACK becomes 0 when ACK is returned from the slave after 1 byte of data is sent, indicating that the
slave has received the data correctly. If RTACK is 1, the slave device is not operating or the data was
not received correctly.
When receiving data
Sets the response bit sent to the slave.
1 (R/W): Error (NACK)
0 (R/W): ACK (default)
To return an ACK after data has been received, RTACK should be set to 0 before the I2C module sends
the response bit.
To return an NACK, set RTACK to 1.
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D[7:0] RTDT[7:0]: Receive/Transmit Data Bits
When sending data
Set the transmission data. (Default: 0x0)
Data transmission is started by setting TXE (D9) to 1. If a slave address or data is currently being trans-
mitted, transmission begins once the previous transmission is completed. Serial converted data is output
from the SDA pin with MSB leading and bits set to 0 as Low level.
A transmit buffer empty interrupt factor is generated as soon as the data written to this register is trans-
ferred to the shift register, after which the subsequent transmission data can be written.
When receiving data
Read the receive data. (Default: 0x0)
Data receipt is started by setting RXE (D10) to 1. If a slave address is currently being transmitted or
data is currently being received, the new receipt starts once the previous data has been transferred. The
RBRDY flag (D11) is set and a receive buffer full interrupt factor generated as soon as receipt is com-
plete and the shift register data is transferred to this register. Data can then be read until the subsequent
data has been received. If the subsequent data is received before this register is read out, the contents
are overwritten by the most recent received data.
Serial data input from the SDA pin with MSB leading is converted to parallel, with the High level bit
set to 1 and the Low level bit set to 0, then loaded to this register.
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0x4346: I2C Interrupt Control Register (I2C_ICTL)
Register name Address Bit Name Function Setting Init. R/W Remarks
I2C Interrupt
Control Register
(I2C_ICTL)
0x4346
(16 bits)
D15–2 –reserved – – – 0 when being read.
D1 RINTE Receive interrupt enable 1 Enable 0 Disable 0 R/W
D0 TINTE Transmit interrupt enable 1 Enable 0 Disable 0 R/W
D[15:2] Reserved
D1 RINTE: Receive Interrupt Enable Bit
Permits or prohibits receive buffer full I2C interrupts.
1 (R/W): Permitted
0 (R/W): Prohibited (default)
Setting RINTE to 1 permits the output of I2C interrupt requests to the ITC due to a receive data buffer
full. These interrupt requests are generated when the data received in the shift register is transferred to
RTDT[7:0] (D[7:0]/I2C_DAT register) (when receipt is complete).
I2C interrupts are not generated by receive data buffer full if RINTE is set to 0.
D0 TINTE: Transmit Interrupt Enable Bit
Permits or prohibits transmit buffer empty I2C interrupts.
1 (R/W): Permitted
0 (R/W): Prohibited (default)
Setting TINTE to 1 permits the output of I2C interrupt requests to the ITC due to a transmit buffer
empty. These interrupt requests are generated when the data written to RTDT[7:0] (D[7:0]/I2C_DAT
register) is transferred to the shift register.
I2C interrupts are not generated by transmit buffer empty if TINTE is set to 0.
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21RemoteController(REMC)
21.1 REMC Configuration
The S1C17001 incorporates a remote controller (REMC) module for generating infrared remote control commu-
nication signals. The REMC module consists of a carrier generation circuit for generating a carrier signal using
the prescaler output clock, an 8-bit down-counter for counting the transferred data length, a modulation circuit for
generating transmission data of the specified carrier length, and an edge detection circuit for detecting input signal
rising and falling edges.
The module is also capable of generating counter underflow interrupts indicating that the specified data length has
been transmitted and input rising/falling edge detection interrupts for data receipt processing.
Figure 21.1.1 shows the REMC module configuration.
Carrier generation
circuit
Internal bus
Remote controller
Bus I/F
and
control
register Data length
counter
REMO (P05)
REMI (P04)
Edge detection
circuit
Modulation
circuit
Interrupt
control
PCLK-1/1 to 1/16K
Prescaler
ITC
Figure 21.1.1: REMC module configuration
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21.2 REMC Input/output Pin
Table 21.2.1 lists the REMC input/output pins.
Table 21.2.1: REMC input/output pin list
Pin name I/O Qty Function
REMI (P04) I 1 Remote control transmit data input pin
Inputs receive data.
REMO (P05) O 1 Remote control transmit data output pin
Outputs modulated remote control transmit data.
The REMC module input/output pins (REMI, REMO) are shared with general purpose input/output port pins
(P04, P05) and are initially set as general purpose input/output port pins. The function must be switched using the
P0_PMUX register setting to use general purpose input/output port pins as REMC input/output pins. Switch the
pins to REMC input/output by setting the following control bits to 1.
P04 → REMI
* P04MUX: P04 Port Function Select Bit in the P0 Port Function Select (P0_PMUX) Register (D4/0x52a0)
P05 → REMO
* P05MUX: P05 Port Function Select Bit in the P0 Port Function Select (P0_PMUX) Register (D5/0x52a0)
For detailed information on pin function switching, refer to “10.2 Input/output Pin Function Selection (Port
MUX).”
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21.3 Carrier Generation
The REMC module incorporates a carrier generation circuit that generates a carrier signal for transmission in ac-
cordance with the clock set by the software and carrier H and L section lengths.
The prescaler output clock is used for the carrier signal generation clock. The prescaler generates 15 different
clocks, dividing the PCLK clock from 1/1 to 1/16K. One is selected by CGCLK[3:0] (D[7:4]/REMC_PSC regis-
ter).
* CGCLK[3:0]: Carrier Generator Clock Select Bits in the REMC Prescaler Clock Select (REMC_PSC) Register
(D[7:4]/0x5341)
Table 21.3.1: Carrier generation clock selection
CGCLK[3:0] Prescaler output clock CGCLK[3:0] Prescaler output clock
0xf Reserved 0x7 PCLK-1/128
0xe PCLK-1/16384 0x6 PCLK-1/64
0xd PCLK-1/8192 0x5 PCLK-1/32
0xc PCLK-1/4096 0x4 PCLK-1/16
0xb PCLK-1/2048 0x3 PCLK-1/8
0xa PCLK-1/1024 0x2 PCLK-1/4
0x9 PCLK-1/512 0x1 PCLK-1/2
0x8 PCLK-1/256 0x0 PCLK-1/1
(Default: 0x0)
For more information on prescaler control, refer to “9 Prescaler (PSC).”
Note: The prescaler must run before the REMC module.
The carrier H and L section lengths are set by REMCH[5:0] (D[5:0]/REMC_CARH register) and REMCL[5:0]
(D[5:0]/REMC_CARL register), respectively. These registers set a value corresponding to the number of clock
cycles selected above + 1.
* REMCH[5:0]: H Carrier Length Setup Bits in the REMC H Carrier Length Setup (REMC_CARH) Register
(D[5:0]/0x5342)
* REMCL[5:0]: L Carrier Length Setup Bits in the REMC L Carrier Length Setup (REMC_CARL) Register
(D[5:0]/0x5343)
The carrier H and L section lengths can be calculated as follows:
REMCH + 1
Carrier H section length = —————— [s]
clk_in
REMCL + 1
Carrier L section length = —————— [s]
clk_in
REMCH: Carrier H section length register data value
REMCL: Carrier L section length register data value
clk_in: Prescaler output clock frequency
The carrier signal is generated from these settings as shown in Figure 21.3.1.
Example: CGCLK[3:0] = 0x2 (PCLK-1/4), REMCH[5:0] = 2, REMCL[5:0] = 1
PCLK
PSC output clock
Count
Carrier
0 1 2 0 1 0
Carrier H section length Carrier L section length
Figure 21.3.1: Carrier signal generation
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21.4 Data Length Counter Clock Settings
The data length counter is an 8-bit counter for setting data lengths when transmitting data.
When a value corresponding to the data pulse width is written during data transmission, the data length counter be-
gins counting down from that value, generating an underflow interrupt factor and halting when the counter reaches 0.
The subsequent transmit data is set using this interrupt.
This counter is also used for data receiving, enabling measurement of the receive data length. Interrupts can be gen-
erated at the input signal rising or falling edges when receiving data. The data pulse length can be obtained from the
difference between data pulses by setting the data length counter to 0xff using the interrupt when the input changes
and by reading out the count value when a subsequent interrupt occurs due to input changes.
This data length counter count clock also uses a prescaler output clock and can select one of 15 different types. The
prescaler output clock is selected by the control bit LCCLK[3:0] (D[3:0]/REMC_PSC register) provided separately
to the carrier generation clock.
* LCCLK[3:0]: Length Counter Clock Select Bits in the REMC Prescaler Clock Select (REMC_PSC) Register
(D[3:0]/0x5341)
Table 21.4.1: Data length counter clock selection
LCCLK[3:0] Prescaler output clock LCCLK[3:0] Prescaler output clock
0xf Reserved 0x7 PCLK-1/128
0xe PCLK-1/16384 0x6 PCLK-1/64
0xd PCLK-1/8192 0x5 PCLK-1/32
0xc PCLK-1/4096 0x4 PCLK-1/16
0xb PCLK-1/2048 0x3 PCLK-1/8
0xa PCLK-1/1024 0x2 PCLK-1/4
0x9 PCLK-1/512 0x1 PCLK-1/2
0x8 PCLK-1/256 0x0 PCLK-1/1
(Default: 0x0)
The data length counter can count up to 256. The count clock should be selected to ensure that the data length fits
within this range.
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21.5 Data Transfer Control
Make the following settings before starting data transfers.
(1) Set the carrier signal. (See Section 21.3.)
(2) Select the data length counter clock. (See Section 21.4.)
(3) Set the interrupt conditions. (See Section 21.6.)
Note: Make sure the REMC module is halted (when REMEN/REMC_CFG register = 0) before chang-
ing the above settings.
* REMEN: REMC Enable Bit in the REMC Configuration (REMC_CFG) Register (D0/0x5340)
Data transfer control
REMDT
REMO pin output
Carrier
REMDT
REMO pin output
Figure 21.5.1: Data transmission
PCLK
PSC output clock
(data length counter clock)
REMLEN[7:0]
Interrupt signal
4321 0
Figure 21.5.2: Underflow interrupt generation timing
(1) Data transmit mode setting
Set REMC to transmit mode by writing 0 to REMMD (D1/REMC_CFG register).
* REMMD: REMC Mode Select Bit in the REMC Configuration (REMC_CFG) Register (D1/0x5340)
(2) Permit data transmission
Permit REMC operation by setting REMEN (D0/REMC_CFG register) to 1. This initiates REMC transmission.
Set REMDT (D0/REMC_ST register) to 0 and REMLEN[7:0] (D[7:0]/REMC_LCNT register) to 0x0 before
setting REMEN to 1 to prevent unnecessary data transmission.
(3) Transmission data settings
Set the data to be transmitted (High or Low) to REMDT (D0/REMC_ST register).
* REMDT: Transmit/Receive Data Bit in the REMC Status (REMC_ST) Register (D0/0x5344)
Setting REMDT to 1 outputs High; setting it to 0 outputs Low from the REMO pin after being modulated by
the carrier signal.
(4) Data pulse length setting
Set the value corresponding to the data pulse length (High or Low section) at the start of transmission to REM-
LEN[7:0] (D[7:0]/REMC_LCNT register) to set to the data length counter.
* REMLEN[7:0]: Transmit/Receive Data Length Count Bits in the REMC Length Counter (REMC_LCNT)
Register (D[7:0]/0x5345)
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Given below are the values to which the data length counter is set:
Setting = Data pulse length (seconds) x prescaler output clock frequency (Hz)
The data length counter begins counting down from the value written using the prescaler output clock selected.
An underflow interrupt factor occurs when the data length counter value reaches 0. If interrupts are permitted,
an REMC interrupt request is output to the interrupt controller (ITC). The data length counter stops counting
when it reaches 0.
(5) Interrupt processing
To transmit the subsequent data, set the subsequent data (step 3) and set the data pulse length (step 4) as part of
the interrupt processing routine generated by the data length counter underflow.
(6) Data transmission end
To end data transmission, set REMEN to 0 after the final data transmission is complete (after underflow inter-
rupt has occurred).
Data receipt control
PCLK
PSC output clock
(data length counter clock)
REMI input
REMDT
(sample waveform)
REMRIF
REMFIF
Interrupt signal
REMLEN[7:0]
0xff written
x+2 x+1 x 0xff 0xfe 0xfd 0xff
0xff written
1 written
1 written
Figure 21.5.3: Data receipt
(1) Data receipt mode setting
Set REMC to receipt mode by writing 1 to REMMD (D1/REMC_CFG register).
(2) Permit data receipt
Permit REMC operation by setting REMEN (D0/REMC_CFG register) to 1. This initiates REMC transmission
(input edge detection operation).
.
REMC detects input changes (signal rising or falling edges) by sampling the input signal from the REMI pin
using the prescaler output clock selected for carrier generation. If a signal edge is detected, a rising or falling
edge interrupt factor is generated. An REMC interrupt request is output to the ITC if interrupts are permitted.
Rising edge and falling edge interrupts can be individually permitted or blocked.
Note that if the signal level after the input has changed is not detected for at least two continuous sampling
clock cycles, the interrupt factor is interpreted as noise, and no rising or falling edge interrupt is generated.
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(3) Interrupt processing
When a rising edge or falling edge interrupt occurs, 0xff is written to REMLEN[7:0] (D[7:0]/REMC_LCNT
register) as part of the interrupt processing routine and set as the value of the data length counter.
The data length counter begins counting down using the selected prescaler output clock from the value written.
The data received can be read out from REMDT (D0/REMC_ST register).
The subsequent trailing or rising edge interrupt is generated once the data pulse ends, at which point the data
length counter is read out. The data length can be calculated from the difference between 0xff and the value
read. To receive the subsequent data, set the data length counter to 0xff once again, then wait for the subsequent
interrupt.
If the data length counter becomes 0 after being set to 0xff without the occurrence of an edge interrupt, either
data receiving is complete or a receive error has occurred. Data length counter underflow interrupts are gener-
ated even when receiving data and should be used for end/error processing.
(4) Data receipt end
To end data receipt, write 0 to REMEN after the final data has been received.
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21.6 REMC Interrupts
The REMC module includes functions to generate the following three different interrupt types.
• Underflow interrupt
• Rising edge interrupt
• Falling edge interrupt
The REMC module outputs one interrupt signal shared by the three interrupt factors above to the interrupt control-
ler (ITC). To identify the interrupt factor that occurred, inspect the interrupt flag within the REMC module.
Underflow interrupt
Generated when the data length counter has counted down to 0, this interrupt request sets the interrupt flag RE-
MUIF (D0/REMC_IFLG register) inside the REMC to 1.
When data is being transmitted, the underflow interrupt indicates that the specified data length has been trans-
mitted. When receiving data, the underflow interrupt indicates that data has been received or that a receive error
has occurred.
* REMUIF: Underflow Interrupt Flag in the REMC Interrupt Flag (REMC_IFLG) Register (D0/0x5347)
To use this interrupt, set REMUIE (D0/REMC_IMSK register) to 1. If REMUIE is set to 0 (default), REMUIF
will not be set to 1, and the interrupt request attributable to this factor will not be sent to the ITC.
* REMUIE: Underflow Interrupt Enable Bit in the REMC Interrupt Mask (REMC_IMSK) Register (D0/0x5346)
When REMUIF is set to 1, REMC outputs an interrupt request signal to the ITC. This interrupt request sets the
REMC interrupt flag to 1 within the ITC, and generates an interrupt if the ITC and S1C17 core interrupt condi-
tions are met.
REMUIF should be inspected as part of the REMC interrupt processing routine to determine whether the
REMC interrupt is attributable to data length counter underflow.
The interrupt factor should be cleared as part of the interrupt processing routine by resetting both the ITC
REMC interrupt flag and REMC module REMUIF (i.e., setting both to 1).
Rising edge interrupt
Generated when the REMI pin input signal changes from Low to High, this interrupt request sets the interrupt
flag REMRIF (D1/REMC_IFLG register) to 1 within the REMC.
When data is being received, the data length counter can be operated between this interrupt and a falling edge
interrupt to calculate the received data pulse width from that count value.
* REMRIF: Rising Edge Interrupt Flag in the REMC Interrupt Flag (REMC_IFLG) Register (D1/0x5347)
To use this interrupt, set REMRIE (D1/REMC_IMSK register) to 1. If REMRIE is set to 0 (default), REMRIF
is not set to 1 and the interrupt request for this factor is not sent to the ITC.
* REMRIE: Rising Edge Interrupt Enable Bit in the REMC Interrupt Mask (REMC_IMSK) Register (D1/0x5346)
When REMRIF is set to 1, REMC outputs an interrupt request to the ITC. This interrupt request signal sets the
REMC interrupt flag to 1 within the ITC, generating an interrupt if the ITC and S1C17 core interrupt conditions
are met.
REMRIF should be inspected as part of the REMC interrupt processing routine to determine whether the
REMC interrupt is attributable to input signal rising edge.
The interrupt factor should be cleared as part of the interrupt processing routine by resetting both the ITC
REMC interrupt flag and REMC module REMRIF (i.e., setting both to 1).
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Falling edge interrupt
Generated when the REMI pin input signal changes from High to Low, this interrupt request sets the interrupt
flag REMRIF (D2/REMC_IFLG register) to 1 within the REMC.
When data is being received, the data length counter can be operated between this interrupt and a falling edge
interrupt to calculate the received data pulse width from that count value.
* REMFIF: Falling Edge Interrupt Flag in the REMC Interrupt Flag (REMC_IFLG) Register (D2/0x5347)
To use this interrupt, set REMFIE (D2/REMC_IMSK register) to 1. If REMFIE is set to 0 (default), REMFIF is
not set to 1 and the interrupt request for this factor is not sent to the ITC.
* REMFIE: Falling Edge Interrupt Enable Bit in the REMC Interrupt Mask (REMC_IMSK) Register (D2/0x5346)
When REMFIF is set to 1, REMC outputs an interrupt request to the ITC. This interrupt request signal sets the
REMC interrupt flag to 1 within the ITC, generating an interrupt if the ITC and S1C17 core interrupt conditions
are met.
REMFIF should be inspected as part of the REMC interrupt processing routine to determine whether the
REMC interrupt is attributable to input signal falling edge.
The interrupt factor should be cleared as part of the interrupt processing routine by resetting both the ITC
REMC interrupt flag and REMC module REMFIF (i.e., setting both to 1).
REMC interrupt ITC register
The REMC module outputs an interrupt signal to the ITC if an interrupt factor permitted by the previous set-
tings occurs. To generate an REMC interrupt, the interrupt level and interrupt permission should be set using
the ITC register.
The ITC control bits for the REMC are given below.
ITC internal interrupt flag
* IIFT5: Remote Controller Interrupt Flag in the Interrupt Flag (ITC_IFLG) Register (D13/0x4300)
ITC internal interrupt enable bit
* IIEN5: Remote Controller Interrupt Enable Bit in the Interrupt Enable (ITC_EN) Register (D13/0x4302)
ITC internal interrupt level setting bit
*
IILV5[2:0]: REMC Interrupt Level Bits in the Internal Interrupt Level Setup (ITC_ILV2) Register 2 (D[10:8]/0x4312)
Interrupt signals from the REMC module set IIFT5 to 1. If IIEN5 is set to 1 here, the ITC sends an interrupt
request to the S1C17 core. To block interrupts by the REMC module, set IIEN5 to 0. IIFT5 is set to 1 by the
interrupt signal from the REMC module, regardless of the IIEN5 setting (even if set to 0).
IILV5[2:0] sets the REMC interrupt level (0 to 7).
The S1C17 core accepts interrupts when all of the following conditions are met:
• The interrupt enable bit is set to 1.
• The PSR (S1C17 core internal processor status register) IE (interrupt enable) bit is set to 1.
• The REMC interrupt has a higher interrupt level set than that set for the PSR IL (interrupt level).
• There are no other interrupt factors, including NMI, with higher priority.
For detailed information on these interrupt registers and operations when interrupts occur, refer to “6 Interrupt
Controller (ITC).”
Interrupt vectors
The REMC interrupt vector numbers and vector addresses are as listed below.
Vector number: 17 (0x11)
Vector address: 0x8040
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21.7 Control Register Details
Table 21.7.1: REMC register list
Address Register name Function
0x5340 REMC_CFG REMC Configuration Register Transfer selection and permission
0x5341 REMC_PSC REMC Prescaler Clock Select Register Prescaler output clock selection
0x5342 REMC_CARH REMC H Carrier Length Setup Register Carrier H section length setting
0x5343 REMC_CARL REMC L Carrier Length Setup Register Carrier L section length setting
0x5344 REMC_ST REMC Status Register Transfer bit
0x5345 REMC_LCNT REMC Length Counter Register Transfer data length setting
0x5346 REMC_IMSK REMC Interrupt Mask Register Interrupt mask setting
0x5347 REMC_IFLG REMC Interrupt Flag Register Interrupt occurrence status display and resetting
The REMC registers are described in detail below. These are 8-bit registers.
Note: When data is written to the registers, the “Reserved” bits must always be written as 0 and not 1.
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0x5340: REMC Configuration Register (REMC_CFG)
Register name Address Bit Name Function Setting Init. R/W Remarks
REMC
Configuration
Register
(REMC_CFG)
0x5340
(8 bits)
D7–2 –reserved – – – 0 when being read.
D1 REMMD REMC mode select 1 Receive 0 Transmit 0 R/W
D0 REMEN REMC enable 1 Enable 0 Disable 0 R/W
D[7:2] Reserved
D1 REMMD: REMC Mode Select Bit
Selects the transfer direction.
1 (R/W): Receive
0 (R/W): Transmit (default)
D0 REMEN: REMC Enable Bit
Permits or prohibit data transfer by the REMC module
1 (R/W): Permitted
0 (R/W): Prohibited (default)
Setting REMEN to 1 begins transmission or receiving in accordance with REMMD (D1) settings.
Setting REMEN to 0 halts REMC module operations.
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0x5341: REMC Prescaler Clock Select Register (REMC_PSC)
Register name Address Bit Name Function Setting Init. R/W Remarks
REMC
Prescaler Clock
Select Register
(REMC_PSC)
0x5341
(8 bits)
D7–4 CGCLK[3:0] Carrier generator clock select
(Prescaler output clock)
CGCLK[3:0]
LCCLK[3:0] Clock 0x0 R/W
0xf
0xe
0xd
0xc
0xb
0xa
0x9
0x8
0x7
0x6
0x5
0x4
0x3
0x2
0x1
0x0
reserved
PCLK-1/16384
PCLK-1/8192
PCLK-1/4096
PCLK-1/2048
PCLK-1/1024
PCLK-1/512
PCLK-1/256
PCLK-1/128
PCLK-1/64
PCLK-1/32
PCLK-1/16
PCLK-1/8
PCLK-1/4
PCLK-1/2
PCLK-1/1
D3–0 LCCLK[3:0] Length counter clock select
(Prescaler output clock)
0x0 R/W
D[7:4] CGCLK[3:0]: Carrier Generator Clock Select Bits
Select a carrier generation clock from the 15 prescaler output clocks.
Table 21.7.2: Carrier generation clock selection
CGCLK[3:0] Prescaler output clock CGCLK[3:0] Prescaler output clock
0xf Reserved 0x7 PCLK-1/128
0xe PCLK-1/16384 0x6 PCLK-1/64
0xd PCLK-1/8192 0x5 PCLK-1/32
0xc PCLK-1/4096 0x4 PCLK-1/16
0xb PCLK-1/2048 0x3 PCLK-1/8
0xa PCLK-1/1024 0x2 PCLK-1/4
0x9 PCLK-1/512 0x1 PCLK-1/2
0x8 PCLK-1/256 0x0 PCLK-1/1
(Default: 0x0)
D[3:0] LCCLK[3:0]: Length Counter Clock Select Bits
Select a data length counter clock from the 15 prescaler output clocks.
Table 21.7.3: Carrier generation clock selection
LCCLK[3:0] Prescaler output clock LCCLK[3:0] Prescaler output clock
0xf Reserved 0x7 PCLK-1/128
0xe PCLK-1/16384 0x6 PCLK-1/64
0xd PCLK-1/8192 0x5 PCLK-1/32
0xc PCLK-1/4096 0x4 PCLK-1/16
0xb PCLK-1/2048 0x3 PCLK-1/8
0xa PCLK-1/1024 0x2 PCLK-1/4
0x9 PCLK-1/512 0x1 PCLK-1/2
0x8 PCLK-1/256 0x0 PCLK-1/1
(Default: 0x0)
Note: The clock should be set only while the REMC module is stopped (REMEN/REMC_CFG register
= 0).
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0x5342: REMC H Carrier Length Setup Register (REMC_CARH)
Register name Address Bit Name Function Setting Init. R/W Remarks
REMC H Carrier
Length Setup
Register
(REMC_CARH)
0x5342
(8 bits)
D7–6 –reserved – – – 0 when being read.
D5–0
REMCH[5:0]
H carrier length setup 0x0 to 0x3f 0x0 R/W
D[7:6] Reserved
D[5:0] REMCH[5:0]: H Carrier Length Setup Bits
Set the carrier signal H section length. (Default: 0x0)
Specify a value corresponding to the number of carrier generation clock cycles selected by CG-
CLK[3:0] (D[7:4]/REMC_PSC register) + 1.
Calculate carrier H section length as follows:
REMCH + 1
Carrier H section length = —————— [s]
clk_in
REMCH: REMCH[5:0] settings
clk_in: Prescaler output clock frequency
The L section length is specified by REMCL[5:0] (D[5:0]/REMC_CARL register).
The carrier signal is generated from these settings as shown in Figure 21.7.1.
Example: CGCLK[3:0] = 0x2 (PCLK-1/4), REMCH[5:0] = 2, REMCL[5:0] = 1
PCLK
PSC output clock
Count
Carrier
0 1 2 0 1 0
Carrier H section length Carrier L section length
Figure 21.7.1: Carrier signal generation
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0x5343: REMC L Carrier Length Setup Register (REMC_CARL)
Register name Address Bit Name Function Setting Init. R/W Remarks
REMC L Carrier
Length Setup
Register
(REMC_CARL)
0x5343
(8 bits)
D7–6 –reserved – – – 0 when being read.
D5–0 REMCL[5:0] L carrier length setup 0x0 to 0x3f 0x0 R/W
D[7:6] Reserved
D[5:0] REMCL[5:0]: L Carrier Length Setup Bits
Set the carrier signal L section length. (Default: 0x0)
Specify a value corresponding to the number of carrier generation clock cycles selected by CG-
CLK[3:0] (D[7:4]/REMC_PSC register) + 1.
Calculate carrier L section length as follows:
REMCL + 1
Carrier L section length = —————— [s]
clk_in
REMCH: REMCL[5:0] settings
clk_in: Prescaler output clock frequency
The H section length is specified by REMCH[5:0] (D[5:0]/REMC_CARH register).
The carrier signal is generated from these settings as shown in Figure 21.7.1.
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0x5344: REMC Status Register (REMC_ST)
Register name Address Bit Name Function Setting Init. R/W Remarks
REMC
Status Register
(REMC_ST)
0x5344
(8 bits)
D7–1 –reserved – – – 0 when being read.
D0 REMDT Transmit/receive data 1 1 (H) 0 0 (L) 0 R/W
D[7:1] Reserved
D0 REMDT: Transmit/Receive Data Bit
Sets the transmit data for data transmission. Receive data can be read when receiving data.
1 (R/W): 1 (H)
0 (R/W): 0 (L) (default)
If REMEN (D0/REMC_CFG register) is set to 1, the REMDT setting is modulated by the carrier signal
for data transmission and output from the REMO pin. For data receiving, this bit is set to the value cor-
responding to the signal level of the data pulse input.
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0x5345: REMC Length Counter Register (REMC_LCNT)
Register name Address Bit Name Function Setting Init. R/W Remarks
REMC Length
Counter Register
(REMC_LCNT)
0x5345
(8 bits)
D7–0
REMLEN[7:0]
Transmit/receive data length count
(down counter)
0x0 to 0xff 0x0 R/W
D[7:0] REMLEN[7:0]: Transmit/Receive Data Length Count Bits
Sets the data length counter value and begins counting. (Default: 0x0)
The counter stops when it reaches 0 and generates an underflow interrupt factor.
For data transmission
Sets the transmit data length for data transmission.
When a value corresponding to the data pulse width is written, the data length counter begins counting
down from that value, generating an underflow interrupt and halting when the counter reaches 0.
The subsequent transmit data is set using this interrupt.
For data receiving
Interrupts can be generated at the input signal rising or falling edges when receiving data. The data
pulse length can be obtained from the difference by setting the data length counter to 0xff using the in-
terrupt when the input changes and reading out the count value when the next interrupt occurs due to an
input change.
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0x5346: REMC Interrupt Mask Register (REMC_IMSK)
Register name Address Bit Name Function Setting Init. R/W Remarks
REMC Interrupt
Mask Register
(REMC_IMSK)
0x5346
(8 bits)
D7–3 –reserved – – – 0 when being read.
D2 REMFIE Falling edge interrupt enable 1 Enable 0 Disable 0 R/W
D1 REMRIE Rising edge interrupt enable 1 Enable 0 Disable 0 R/W
D0 REMUIE Underflow interrupt enable 1 Enable 0 Disable 0 R/W
This register permits or blocks individual interrupt requests due to data length counter underflow, input signal rising
edge, or input signal falling edge. Setting the interrupt enable bit to 1 permits interrupt requests from corresponding
factors; setting it to 0 prevents interrupts. To generate interrupts, note that the ITC REMC interrupt enable bit must
also be set to permit interrupts.
D[7:3] Reserved
D2 REMFIE: Falling Edge Interrupt Enable Bit
Permits or blocks input signal falling edge interrupts.
1 (R/W): Interrupt permitted
0 (R/W): Interrupt prohibited (default)
D1 REMRIE: Rising Edge Interrupt Enable Bit
Permits or blocks input signal rising edge interrupts.
1 (R/W): Interrupt permitted
0 (R/W): Interrupt prohibited (default)
D0 REMUIE: Underflow Interrupt Enable Bit
Permits or blocks data length counter underflow interrupts.
1 (R/W): Interrupt permitted
0 (R/W): Interrupt prohibited (default)
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0x5347: REMC Interrupt Flag Register (REMC_IFLG)
Register name Address Bit Name Function Setting Init. R/W Remarks
REMC Interrupt
Flag Register
(REMC_IFLG)
0x5347
(8 bits)
D7–3 –reserved – – – 0 when being read.
D2 REMFIF Falling edge interrupt flag 1 Cause of
interrupt
occurred
0 Cause of
interrupt not
occurred
0 R/W Reset by writing 1.
D1 REMRIF Rising edge interrupt flag 0 R/W
D0 REMUIF Underflow interrupt flag 0 R/W
This register indicates the occurrence status of interrupt factors arising from data length counter underflow, input
signal rising edge, or input signal falling edge. When an REMC interrupt occurs, the interrupt flag in this register
should be inspected to identify the interrupt factor.
Setting the corresponding interrupt enable bit to 1 sets the interrupt flag to 1 when a data length counter underflow,
input signal rising edge, or input signal falling edge occurs. The REMC outputs an interrupt request signal to the
ITC at the same time, which sets the REMC interrupt flag to 1 within the ITC and generates an interrupt if the ITC
and S1C17 core interrupt conditions are met.
Note: To prevent generating unnecessary interrupts, reset the interrupt flag before permitting inter-
rupts by the interrupt enable bit.
D2 REMFIF: Falling Edge Interrupt Flag
Interrupt flag indicating the falling edge interrupt occurrence status.
1(R): Interrupt factor present
0(R): No interrupt factor (default)
1(W): Reset flag
0(W): Disabled
Setting REMFIE (D2/REMC_IMSK register) to 1 sets SIF1 to 1 at the input signal falling edge.
D1 REMRIF: Rising Edge Interrupt Flag
Interrupt flag indicating the rising edge interrupt factor occurrence status.
1(R): Interrupt factor present
0(R): No interrupt factor (default)
1(W): Reset flag
0(W): Disabled
Setting REMRIF (D1/REMC_IMSK register) to 1 sets REMRIE to 1 at the input signal falling edge.
D0 REMUIF: Underflow Interrupt Flag
Interrupt flag indicating the underflow interrupt factor occurrence status.
1(R): Interrupt factor present
0(R): No interrupt factor (default)
1(W): Reset flag
0(W): Disabled
Setting REMUIE (D1/REMC_IMSK register) to 1 sets REMUIF to 1 when a data length counter under-
flow occurs.
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21.8 Precautions
The prescaler must run before operating the REMC module.
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22 ON-CHIP DEBUGGER (DBG)
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22On-chipDebugger(DBG)
22.1 Resource Requirements and Debugging Tool
Debugging work area
Debugging requires a 64-byte debugging work area. In the S1C17001, RAM addresses 0x0007c0 to 0x0007ff
are assigned as the debugging work area. When using the debugging function, avoid using this area for any
other user applications.
The start address for this debugging work area can be read from the DBRAM register (0xffff90).
Debugging tool
Debugging involves connecting an ICD (In-Circuit Debugger) such as S5U1C17001H (ICD Mini) to the
S1C17701 debug pin and inputting the debug command from the PC debugger.
The following tools are required:
• S1C17 Family In-Circuit Debugger (e.g., S5U1C17001H)
• S1C17 Family C compiler package (S5U1C17001C)
Debug pins
The following debug pins are used to connect an ICD (e.g., S5U1C17001H).
Table 22.1.1: Debug pin list
Pin name I/O Qty Function
DCLK (P31) O 1 On-chip debugger clock output pin
Outputs a clock to the ICD.
DSIO (P33) I/O 1 On-chip debugger data input/output pin
Used for inputting/outputting debugging data and inputting break signals.
DST2 (P32) O 1 On-chip debugger status signal output pin
Outputs the processor status during debugging.
Shared with general purpose input/output port pins (P31, P32, P33), the on-chip debugger input/output pins
(DCLK, DST2, DSIO) are initially set for use as debugger pins. If the debugging function is not used, these
pins can be switched via the P3_PMUX register to enable use as general purpose input/output port pins. Set the
control bits shown below to 1 to switch the pins to general purpose input/output port use.
DCLK → P31
* P31MUX: P31 Port Function Select Bit in the P3 Port Function Select (P3_PMUX) Register (D1/0x52a3)
DST2 →P32
* P32MUX: P32 Port Function Select Bit in the P3 Port Function Select (P3_PMUX) Register (D2/0x52a3)
DSIO → P33
* P33MUX: P33 Port Function Select Bit in the P3 Port Function Select (P3_PMUX) Register (D3/0x52a3)
For more information on pin function and switching, refer to “10.2 Input/Output Pin Function Selection (Port
MUX).”
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22.2 Debug Break Operation Status
The S1C17 core switches to debug mode when the brk command is executed or a debug interrupt is generated by
a break signal (Low) input to the DSIO pin. This state persists until the retd command is executed.
During this time, hardware interrupts and NMIs are disabled.
The default setting halts peripheral circuit operations. This setting can be modified even when debugging is under-
way.
Peripheral circuits that operate using the prescaler output clock
• 8-bit timer
• 16-bit timer
• PWM & capture timer
• Remote controller
• P port
• UART
• SPI
• I2C
With the default settings, the prescaler will stop in debug mode, also stopping the peripheral circuits above that
use the prescaler output clock. The prescaler includes PRUND (D1/PSC_CTL register) to specify prescaler
operations during debug mode. When PRUND is set to 1, the prescaler operates even in debug mode, allowing
the peripheral circuits above to operate as well. When PRUND is 0 (default), the prescaler and the peripheral
circuits above will stop when the S1C17 core switches to debug mode.
*
PRUND: Prescaler Run/Stop Setting (in Debug Mode) Bit in the Prescaler Control (PSC_CTL) Register
(D1/0x4020)
Peripheral circuits that operate using the OSC1 clock
• Clock timer
• Watchdog timer
• Stopwatch timer
The MISC register includes O1DBG (D0/MISC_OSC1 register) to specify the operation of the above OSC1
peripheral circuits during debug mode. When O1DBG is set to 1, the OSC1 peripheral circuits operate even in
debug mode. When O1DBG is 0 (default), the OSC1 peripheral circuits will stop when the S1C17 core switch-
es to debug mode.
* O1DBG: OSC1 Peripheral Control (in Debug Mode) Bit in the OSC1 Peripheral Control (MISC_OSC1)
Register (D0/0x5322)
The 8-bit OSC1 timer does not stop in debug mode, even if O1DBG is set to 1.
22 ON-CHIP DEBUGGER (DBG)
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22.3 Control Register Details
Table 22.3.1: Debug register list
Address Register name Function
0x5322 MISC_OSC1 OSC1 Peripheral Control Register OSC1 operation peripheral function setting for debugging
0xffff90 DBRAM Debug RAM Base Register Debug RAM base address display
The debug registers are described in detail below. These are 8-bit registers.
Note: When data is written to the registers, the “Reserved” bits must always be written as 0 and not 1.
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294 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
0x5322: OSC1 Peripheral Control Register (MISC_OSC1)
Register name Address Bit Name Function Setting Init. R/W Remarks
OSC1 Peripheral
Control Register
(MISC_OSC1)
0x5322
(8 bits)
D7–1 –reserved – – – 0 when being read.
D0 O1DBG OSC1 peripheral control in debug
mode
1 Run 0 Stop 0 R/W
D[7:1] Reserved
D0 O1DBG: OSC1 Peripheral Control in Debug Mode Bit
Sets OSC1 peripheral circuit operation in debug mode.
1 (R/W): Operate
0 (R/W): Stop (default)
OSC1 peripheral circuit refers to the following peripheral circuits that operate using the OSC1 clock.
• Clock timer
• Watchdog timer
• Stopwatch timer
The 8-bit OSC1 timer does not stop in debug mode, even if O1DBG is set to 1.
22 ON-CHIP DEBUGGER (DBG)
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0xffff90: Debug RAM Base Register (DBRAM)
Register name Address Bit Name Function Setting Init. R/W Remarks
Debug RAM
Base Register
(DBRAM)
0xffff90
(32 bits)
D31–24 –Unused (fixed at 0) 0x0 0x0 R
D23–0
DBRAM[23:0]
Debug RAM base address 0x7c0
0x7c0
R
D[31:24] Not used (Fixed at 0)
D[23:0] DBRAM[23:0]: Debug RAM Base Address Bits
Read-only register containing the initial address of the debugging work area (64 bytes).
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23 BASIC EXTERNAL CONNECTION DIAGRAM
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23BasicExternalConnectionDiagram
For single power supply (LVDD = HVDD)
P00~P03
P04 (REMI)
P05 (REMO)
P06 (EXCL2)
P07 (EXCL1)
P10~P12
P13 (FOUT1)
P14 (SDA)
P15 (SCL)
P16 (EXCL0)
P17 (#SPISS)
P20 (SDI)
P21 (SDO)
P22 (SPICLK)
P23 (SIN)
P24 (SOUT)
P25 (SCLK)
P26 (TOUT)
P27 (EXCL3)
P30 (FOUT3)
DSIO (P33)
DCLK (P31)
DST2 (P32)
Recommended values for external components
S1C17001
[Circuit board potential (chip underside) is VSS.]
LVDD
HVDD
#TEST1–#TEST5
#RESET
OSC3
OSC4
OSC1
OSC2
TEST0
VSS
ICD or
I/O
I/O
HVDD
10k
Rd3
Rd1
CD3
X'tal3 or CE
Rf3
CG3
CD1
X'tal1
Rf1
CG1
Cres
1.65V
|
2.7V
CP
+
-
Note: The values given here are intended to serve as examples.
They do not represent performance guarantees.
Symbol
X'tal1
CG1
CD1
Rf1
Rd1
X'tal3
CE
CG3
CD3
Rf3
Rd3
CP
Cres
Name
Crystal oscillator
Gate capacitor
Drain capacitor
Feedback resistor
Drain resistor
Crystal oscillator
Ceramic oscillator
Gate capacitor
Drain capacitor
Feedback resistor
Drain resistor
Inter-power supply capacitor
#RESET pin capacitor
Recommended value
32.768kHz (MC-146, Epson Toyocom)
7pF
7pF
10MΩ
0Ω
8MHz (CA-301, Epson Toyocom)
0.2~8MHz
27pF
27pF
1MΩ
0Ω
3.3µF
0.47µF
23 BASIC EXTERNAL CONNECTION DIAGRAM
298 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
For multiple power supplies (LVDD ≠ HVDD)
P00~P03
P04 (REMI)
P05 (REMO)
P06 (EXCL2)
P07 (EXCL1)
P10~P12
P13 (FOUT1)
P14 (SDA)
P15 (SCL)
P16 (EXCL0)
P17 (#SPISS)
P20 (SDI)
P21 (SDO)
P22 (SPICLK)
P23 (SIN)
P24 (SOUT)
P25 (SCLK)
P26 (TOUT)
P27 (EXCL3)
P30 (FOUT3)
DSIO (P33)
DCLK (P31)
DST2 (P32)
S1C17001
[Circuit board potential (chip underside) is VSS.]
HVDD
#TEST1–#TEST5
LVDD
#RESET
OSC3
OSC4
OSC1
OSC2
TEST0
VSS ICD or
I/O
I/O
HVDD
10k
Cres
3.3V CPH
+
-
1.8V CPL
+
-
Recommended values for external components
Note: The values given here are intended to serve as examples.
They do not represent performance guarantees.
Rd3
Rd1
CD3
X'tal3 or CE
Rf3
CG3
CD1
X'tal1
Rf1
CG1
Symbol
X'tal1
CG1
CD1
Rf1
Rd1
X'tal3
CE
CG3
CD3
Rf3
Rd3
CP
Cres
Name
Crystal oscillator
Gate capacitor
Drain capacitor
Feedback resistor
Drain resistor
Crystal oscillator
Ceramic oscillator
Gate capacitor
Drain capacitor
Feedback resistor
Drain resistor
Inter-power supply capacitor
#RESET pin capacitor
Recommended value
32.768kHz (MC-146, Epson Toyocom)
7pF
7pF
10MΩ
0Ω
8MHz (CA-301, Epson Toyocom)
0.2~8MHz
27pF
27pF
1MΩ
0Ω
3.3µF
0.47µF
24 ELECTRICAL CHARACTERISTICS
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 299
24ElectricalCharacteristics
24.1 Absolute Maximum Ratings
(VSS = 0V)
Item Code Condition Rating Units
Power supply voltage HVDD HVDD≥LVDD VSS - 0.3 to 4.0 V
LVDD VSS - 0.3 to 3.0 V
Input voltage HVIVSS - 0.3 to HVDD + 0.5 *1V
LVIVSS - 0.3 to LVDD + 0.5 *1V
Output voltage HVOVSS - 0.3 to HVDD + 0.5 *1V
LVOVSS - 0.3 to LVDD + 0.5 *1V
Output current IOUT 1 pin ±30 (±50 *2) mA
Storage temperature Tstg -65 to 150 °C
*1: With N channel as open drain (-0.3 V to 4.0 V permissible for input buffer)
*2: Applies to 24 mA output current buffer
24.2 Recommended Operating Conditions
(VSS = 0V)
Item Code Condition Min. Typ. Max. Units
Power supply voltage HVDD 1.65 3.6 V
LVDD 1.65 2.7 V
Input voltage HVI-0.3 HVDD
+ 0.3
V
LVI-0.3 LVDD
+ 0.3 *1
V
Operating frequency fOSC3 Crystal/ceramic oscillation 0.2 8.2 MHz
fOSC1 Crystal oscillation 32.768 100 kHz
Ambient temperature Ta -40 85 *2°C
*1: With N channel as open drain (Up to 3.9 V permissible for input buffer)
Do not apply voltages exceeding this value to fail-safe cell for H level output from external sources.
*2: Recommended ambient temperature assuming Tj = -40°C to 125°C.
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300 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
24.3 DC Characteristics
Unless otherwise specified: HVDD = 1.65 to 3.6V, VSS = 0V, Ta = -40 to 85°C
Item Code Condition Min. Typ. Max. Units
High level Schmitt input voltage
VT+ Pxx, #RESET, #TEST1 to 5 0.5HVDD 0.9HVDD V
Low level Schmitt input voltage
VT- Pxx, #RESET, #TEST1 to 5 0.1HVDD 0.4HVDD V
Hysteresis voltage DV1Pxx, #RESET, #TEST1 to 5 (HVDD = 3V) 0.3 V
High level output current IOH Pxx, VOH = HVDD - 0.2V -0.9 mA
Low level output current IOL Pxx, VOL = 0.2V 0.9 mA
Input leakage current ILI Pxx, #RESET, #TEST1 to 5 -1 1 µA
Output leakage current ILO Pxx, #RESET, #TEST1 to 5 -1 1 µA
Input pull-up resistance RPU Pxx, #RESET, #TEST1 to 5 30 480 kW
HVDD
0VT+VT-0
VIN (V)
VOUT (V)
HVDD
Unless otherwise specified: LVDD = 1.65 to 2.7V, VSS = 0V, Ta = -40 to 85°C
Item Code Condition Min. Typ. Max. Units
High level input current VIH TEST0, OSC1, OSC3 0.9LVDD V
Low level input current VIL TEST0, OSC1, OSC3 0.1LVDD V
Input pull-down resistance RPD TEST0 20 240 kW
24 ELECTRICAL CHARACTERISTICS
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24.4 Consumption Current
Unless otherwise specified: 1.8V, LVDD = 1.8V, VSS = 0V, Ta = 25°C, PCKEN = 3
Item Code Condition Min. Typ. Max. Units
Current consumption
at SLEEP
ISLP OSC1 = OFF, OSC3 = OFF 0.5 µA
Current consumption
at HALT
IHALT1 OSC1 = 32kHz, OSC3 = OFF, PCKEN = 0 2.5 µA
IHALT2 OSC1 = 32kHz, OSC3 = 8MHz (ceramic) 580 µA
Current consumption
during execution *1
IEXE1 OSC1 = 32kHz, OSC3 = OFF,
FLCYC = 4 (1 cycle)
10 µA
IEXE2 OSC1 = 32kHz, OSC3 = 8MHz (ceramic),
FLCYC = 4 (1 cycle)
1800 µA
IEXE3 OSC1 = 32kHz, OSC3 = 2MHz (ceramic),
FLCYC = 4 (1 cycle)
500 µA
*1: Current consumption during execution is the value exhibited when operating continuously while fetching the fol-
lowing test program from ROM: ALU commands 60.5%, branching commands 17%, memory reading 12%, and
memory writing 10.5%.
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24.5 AC Characteristics
24.5.1 SPI AC Characteristics
SPICLK
(CPOL = 0)
SPICLK
(CPOL = 1)
SDI
SDO
tSPCK
tSDO tSDH
tSDS
Master mode
Unless otherwise specified: HVDD = 1.65 to 3.6V, LVDD = 1.65 to 2.7V, VSS = 0V, Ta = -40 to 85°C
Item Code Min. Typ. Max. Units
SPICLK cycle time tSPCK 500 ns
SDI setup time tSDS 70 ns
SDI hold time tSDH 10 ns
SDO output delay time tSDO 20 ns
Slave mode
Unless otherwise specified: HVDD = 1.65 to 3.6V, LVDD = 1.65 to 2.7V, VSS = 0V, Ta = -40 to 85°C
Item Code Min. Typ. Max. Units
SPICLK cycle time tSPCK 500 ns
SDI setup time tSDS 10 ns
SDI hold time tSDH 10 ns
SDO output delay time tSDO 80 ns
24.5.2 I2C AC Characteristics
SCL
SDA
tSCL
tSTH tSDD tSPH
Unless otherwise specified: HVDD = 1.65 to 3.6V, LVDD = 1.65 to 2.7V, VSS = 0V, Ta = -40 to 85°C
Item Code Min. Typ. Max. Units
SCL cycle time tSCL 2500 ns
Start condition hold time tSTH 1/fSYS ns
Data output delay time tSDD 1/fSYS ns
Stop condition hold time tSPH 1/fSYS ns
* fSYS: System operation clock frequency
24 ELECTRICAL CHARACTERISTICS
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24.5.3 External Clock Input AC Characteristics
EXCLx
tECH tECL
SCLK
Unless otherwise specified: HVDD = 1.65 to 3.6V, LVDD = 1.65 to 2.7V, VSS = 0V, Ta = -40 to 85°C
Item Code Min. Typ. Max. Units
EXCLx input High pulse width tECH 2/fSYS s
EXCLx input Low pulse width tECL 2/fSYS s
UART transfer rate RU460800 bps
UART transfer rate (IrDA mode) RUIrDA 115200 bps
*fSYS: System operation clock frequency
24.5.4 System AC Characteristics
#RESET
tSR
VIH
VIL
Unless otherwise specified: HVDD = 1.65 to 3.6V, LVDD = 1.65 to 2.7V, VSS = 0V, Ta = -40 to 85°C
Item Code Min. Typ. Max. Units
Reset Low pulse width tSR 100 µs
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304 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
24.6 Oscillation Characteristics
Oscillation characteristics vary depending on various parameters such as components used (oscillator, Rf, Rd, CG,
CD) and circuit board patterns. The characteristics below should be used as reference values. For ceramic or crys-
tal oscillators, select external resistors (Rf, Rd) and capacitors (CG, CD) only after fully evaluating the components
when actually mounted on the circuit board.
OSC1 oscillator circuit (crystal oscillator)
Unless otherwise specified: HVDD = 1.65 to 3.6V, LVDD = 1.65 to 2.7V, VSS = 0V, Ta = 25°C
Item Code Condition Min. Typ. Max. Units
Oscillation start time tsta 3 s
OSC3 oscillator circuit (crystal/ceramic oscillator)
Note: Use a crystal fundamental wave oscillator for the OSC3 crystal oscillator circuit.
Unless otherwise specified: HVDD = 1.65 to 3.6V, LVDD = 1.65 to 2.7V, VSS = 0V, Ta = 25°C
Item Code Condition Min. Typ. Max. Units
Oscillation start time tsta 25 ms
25 PACKAGE
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 305
25Package
WCSP-48pin
D
ZD
G
F
E
D
C
B
A
1234567
A1 Corner
Index
A1 Corner
EA2
ZE2A1
A
Top View
Bottom View
S
y
φφ
b
×
M
e
1
e
Symbol
D
E
A
A1
A2
e 1
e 2
b
X
y
ZD
ZE
Dimension in Millimeters
Min
3.024
3.024
–
–
–
–
–
0.23
–
–
–
–
Nom
3.124
3.124
–
0.23
0.49
0.40
0.40
0.26
–
–
0.362
0.362
Max
3.224
3.224
0.78
–
–
–
–
0.29
0.08
0.05
–
–
25 PACKAGE
306 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
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APPENDIX A I/O REGISTER LIST
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AppendixA:I/ORegisterList
Peripheral circuit
Address Register name Function
Prescaler
(8-bit device)
0x4020 PSC_CTL Prescaler Control Register Prescaler start/stop control
0x4021 to 0x403f
– – Reserved
UART (with IrDA)
(8-bit device)
0x4100 UART_ST UART Status Register Transfer, buffer, error status display
0x4101 UART_TXD UART Transmit Data Register Transmission data
0x4102 UART_RXD UART Receive Data Register Receiving data
0x4103 UART_MOD UART Mode Register Transfer data format setting
0x4104 UART_CTL UART Control Register Data transfer control
0x4105 UART_EXP UART Expansion Register IrDA mode setting
0x4106 to 0x411f
– – Reserved
8-bit timer (with
F mode) (16-bit
device)
0x4200 T8F_CLK 8-bit Timer Input Clock Select Register Prescaler output clock selection
0x4202 T8F_TR 8-bit Timer Reload Data Register Reload data setting
0x4204 T8F_TC 8-bit Timer Counter Data Register Counter data
0x4206 T8F_CTL 8-bit Timer Control Register Timer mode setting and timer RUN/STOP
0x4208 to 0x421f
– – Reserved
16-bit timer Ch.0
(16-bit device)
0x4220 T16_CLK0 16-bit Timer Ch.0 Input Clock Select Register Prescaler output clock selection
0x4222 T16_TR0 16-bit Timer Ch.0 Reload Data Register Reload data setting
0x4224 T16_TC0 16-bit Timer Ch.0 Counter Data Register Counter data
0x4226 T16_CTL0 16-bit Timer Ch.0 Control Register Timer mode setting and timer RUN/STOP
0x4228 to 0x423f
– – Reserved
16-bit timer Ch.1
(16-bit device)
0x4240 T16_CLK1 16-bit Timer Ch.1 Input Clock Select Register Prescaler output clock selection
0x4242 T16_TR1 16-bit Timer Ch.1 Reload Data Register Reload data setting
0x4244 T16_TC1 16-bit Timer Ch.1 Counter Data Register Counter data
0x4246 T16_CTL1 16-bit Timer Ch.1 Control Register Timer mode setting and timer RUN/STOP
0x4248 to 0x425f
– – Reserved
16-bit timer Ch.2
(16-bit device)
0x4260 T16_CLK2 16-bit Timer Ch.2 Input Clock Select Register Prescaler output clock selection
0x4262 T16_TR2 16-bit Timer Ch.2 Reload Data Register Reload data setting
0x4264 T16_TC2 16-bit Timer Ch.2 Counter Data Register Counter data
0x4266 T16_CTL2 16-bit Timer Ch.2 Control Register Timer mode setting and timer RUN/STOP
0x4268 to 0x427f
– – Reserved
I
nterrupt controller
(16-bit device)
0x4300 ITC_IFLG Interrupt Flag Register Interrupt occurrence status display/reset
0x4302 ITC_EN Interrupt Enable Register Maskable interrupt permission/prevention
0x4304 ITC_CTL ITC Control Register ITC operation permission/prevention
0x4306 ITC_ELV0 External Interrupt Level Setup Register 0 P0/P1 port interrupt level and trigger mode
setting
0x4308 ITC_ELV1 External Interrupt Level Setup Register 1 Stopwatch timer and clock timer interrupt
level and trigger mode setting
0x430a ITC_ELV2 External Interrupt Level Setup Register 2 8-bit OSC1 timer interrupt level and trigger
mode setting
0x430c ITC_ELV3 External Interrupt Level Setup Register 3 PWM & capture timer interrupt level and
trigger mode setting
0x430e ITC_ILV0 Internal Interrupt Level Setup Register 0 8-bit timer and 16-bit timer Ch.0 interrupt
level setting
0x4310 ITC_ILV1 Internal Interrupt Level Setup Register 1 16-bit timer Ch.1 and 16-bit timer Ch.2
interrupt level setting
0x4312 ITC_ILV2 Internal Interrupt Level Setup Register 2 UART and remote controller interrupt level
setting
0x4314 ITC_ILV3 Internal Interrupt Level Setup Register 3 SPI and I2C interrupt level setting
0x4316 to 0x431f
– – Reserved
SPI
(16-bit device)
0x4320 SPI_ST SPI Status Register Transfer and buffer status display
0x4322 SPI_TXD SPI Transmit Data Register Transmission data
0x4324 SPI_RXD SPI Receive Data Register Receiving data
0x4326 SPI_CTL SPI Control Register SPI mode and data transfer permission
setting
0x4328 to 0x433f
– – Reserved
I2C
(16-bit device)
0x4340 I2C_EN I2C Enable Register I2C module enable
0x4342 I2C_CTL I2C Control Register I2C control and transfer status display
0x4344 I2C_DAT I2C Data Register Transfer data
0x4346 I2C_ICTL I2C Interrupt Control Register I2C interrupt control
0x4348 to 0x435f
– – Reserved
APPENDIX A I/O REGISTER LIST
308 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
Peripheral circuit
Address Register name Function
Clock timer
(8-bit device)
0x5000 CT_CTL Clock Timer Control Register Timer reset and RUN/STOP control
0x5001 CT_CNT Clock Timer Counter Register Counter data
0x5002 CT_IMSK Clock Timer Interrupt Mask Register Interrupt mask setting
0x5003 CT_IFLG Clock Timer Interrupt Flag Register Interrupt occurrence status display/reset
0x5004 to 0x501f
– – Reserved
Stopwatch timer
(8-bit device)
0x5020 SWT_CTL Stopwatch Timer Control Register Timer reset and RUN/STOP control
0x5021 SWT_BCNT Stopwatch Timer BCD Counter Register BCD counter data
0x5022 SWT_IMSK Stopwatch Timer Interrupt Mask Register Interrupt mask setting
0x5023 SWT_IFLG Stopwatch Timer Interrupt Flag Register Interrupt occurrence status display/reset
0x5024 to 0x503f
– – Reserved
Watchdog timer
(8-bit device)
0x5040 WDT_CTL Watchdog Timer Control Register Timer reset and RUN/STOP control
0x5041 WDT_ST Watchdog Timer Status Register Timer mode setting and NMI status display
0x5042 to 0x505f
– – Reserved
Oscillator circuit
(8-bit device)
0x5060 OSC_SRC Clock Source Select Register Clock source selection
0x5061 OSC_CTL Oscillation Control Register Oscillation control
0x5062 OSC_NFEN Noise Filter Enable Register Noise filter ON/OFF
0x5063 – – Reserved
0x5064 OSC_FOUT FOUT Control Register Clock external output control
0x5065 OSC_T8OSC1 T8OSC1 Clock Control Register 8-bit OSC1 timer clock setting
0x5066 to
0x507f
– – Reserved
Clock generator
(8-bit device)
0x5080 CLG_PCLK PCLK Control Register PCLK feed control
0x5081 CLG_CCLK CCLK Control Register CCLK division ratio setting
0x5082 to 0x509f
– – Reserved
8-bit OSC1 timer
(8-bit device)
0x50c0 T8OSC1_CTL 8-bit OSC1 Timer Control Register Timer mode setting and timer RUN/STOP
0x50c1 T8OSC1_CNT 8-bit OSC1 Timer Counter Data Register Counter data
0x50c2 T8OSC1_CMP 8-bit OSC1 Timer Compare Data Register Compare data setting
0x50c3 T8OSC1_IMSK 8-bit OSC1 Timer Interrupt Mask Register Interrupt mask data
0x50c4 T8OSC1_IFLG 8-bit OSC1 Timer Interrupt Flag Register Interrupt occurrence status display/reset
0x50c5 to 0x50df
– – Reserved
P port & port MUX
(8-bit device)
0x5200 P0_IN P0 Port Input Data Register P0 port input data
0x5201 P0_OUT P0 Port Output Data Register P0 port output data
0x5202 P0_IO P0 Port I/O Direction Control Register P0 port input/output direction selection
0x5203 P0_PU P0 Port Pull-up Control Register P0 port pull-up control
0x5204 – – Reserved
0x5205 P0_IMSK P0 Port Interrupt Mask Register P0 port interrupt mask setting
0x5206 P0_EDGE P0 Port Interrupt Edge Select Register P0 port interrupt edge selection
0x5207 P0_IFLG P0 Port Interrupt Flag Register
P0 port interrupt occurrence status display/reset
0x5208 P0_CHAT P0 Port Chattering Filter Control Register P0 port chattering filter control
0x5209 P0_KRST
P0 Port Key-Entry Reset Configuration Register
P0 port key entry reset setting
0x520a to 0x520f
– – Reserved
0x5210 P1_IN P1 Port Input Data Register P1 port input data
0x5211 P1_OUT P1 Port Output Data Register P1 port output data
0x5212 P1_IO P1 Port I/O Direction Control Register P1 port input/output direction selection
0x5213 P1_PU P1 Port Pull-up Control Register P1 port pull-up control
0x5214 – – Reserved
0x5215 P1_IMSK P1 Port Interrupt Mask Register P1 port interrupt mask setting
0x5216 P1_EDGE P1 Port Interrupt Edge Select Register P1 port interrupt edge selection
0x5217 P1_IFLG P1 Port Interrupt Flag Register
P1 port interrupt occurrence status display/reset
0x5218 to 0x521f
– – Reserved
0x5220 P2_IN P2 Port Input Data Register P2 port input data
0x5221 P2_OUT P2 Port Output Data Register P2 port output data
0x5222 P2_IO P2 Port I/O Direction Control Register P2 port input/output direction selection
0x5223 P2_PU P2 Port Pull-up Control Register P2 port pull-up control
0x5224 to 0x522f
– – Reserved
0x5230 P3_IN P3 Port Input Data Register P3 port input data
0x5231 P3_OUT P3 Port Output Data Register P3 port output data
0x5232 P3_IO P3 Port I/O Direction Control Register P3 port input/output direction selection
0x5233 P3_PU P3 Port Pull-up Control Register P3 port pull-up control
0x5234 to 0x527f
– – Reserved
0x52a0 P0_PMUX P0 Port Function Select Register P0 port function selection
0x52a1 P1_PMUX P1 Port Function Select Register P1 port function selection
0x52a2 P2_PMUX P2 Port Function Select Register P2 port function selection
0x52a3 P3_PMUX P3 Port Function Select Register P3 port function selection
0x52a4 to 0x52bf
– – Reserved
APPENDIX A I/O REGISTER LIST
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 309
Peripheral circuit
Address Register name Function
PWM & capture
timer
(16-bit device)
0x5300 T16E_CA PWM Timer Compare Data A Register Compare data A setting
0x5302 T16E_CB PWM Timer Compare Data B Register Compare data B setting
0x5304 T16E_TC PWM Timer Counter Data Register Counter data
0x5306 T16E_CTL PWM Timer Control Register Timer mode setting and timer RUN/STOP
0x5308 T16E_CLK PWM Timer Input Clock Select Register Prescaler output clock selection
0x530a T16E_IMSK PWM Timer Interrupt Mask Register Interrupt mask setting
0x530c T16E_IFLG PWM Timer Interrupt Flag Register Interrupt occurrence status display/reset
0x530e to 0x531f
– – Reserved
MISC register (8-
bit device)
0x5320 MISC_FL ROM Control Register ROM access condition setting
0x5321 – – Reserved
0x5322 MISC_OSC1 OSC1 Peripheral Control Register OSC1 operation peripheral function setting
for debugging
0x5323 to 0x533f
– – Reserved
Remote control-
ler (8-bit device)
0x5340 REMC_CFG REMC Configuration Register Transfer selection and permission
0x5341 REMC_PSC REMC Prescaler Clock Select Register Prescaler output clock selection
0x5342 REMC_CARH REMC H Carrier Length Setup Register Carrier H section length setting
0x5343 REMC_CARL REMC L Carrier Length Setup Register Carrier L section length setting
0x5344 REMC_ST REMC Status Register Transfer bit
0x5345 REMC_LCNT REMC Length Counter Register Transfer data length setting
0x5346 REMC_IMSK REMC Interrupt Mask Register Interrupt mask setting
0x5347 REMC_IFLG REMC Interrupt Flag Register Interrupt occurrence status display/reset
0x5348 to 0x535f
– – Reserved
Note: Addresses marked as “Reserved” or unused peripheral circuit areas not marked in the table
must not be accessed by application programs.
APPENDIX A I/O REGISTER LIST
310 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
0x4020 Prescaler
Register name Address Bit Name Function Setting Init. R/W Remarks
Prescaler
Con-
trol Register
(PSC_CTL)
0x4020
(8 bits)
D7–2 –reserved – – – 0 when being read.
D1 PRUND Prescaler run/stop in debug mode 1 Run 0 Stop 0 R/W
D0 PRUN Prescaler run/stop control 1 Run 0 Stop 0 R/W
APPENDIX A I/O REGISTER LIST
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 311
0x4100–0x4105 UART (with IrDA)
Register name Address Bit Name Function Setting Init. R/W Remarks
UART Status
Register
(UART_ST)
0x4100
(8 bits)
D7 –reserved – – – 0 when being read.
D6 FER Framing error flag 1 Error 0 Normal 0 R/W Reset by writing 1.
D5 PER Parity error flag 1 Error 0 Normal 0 R/W
D4 OER Overrun error flag 1 Error 0 Normal 0 R/W
D3 RD2B Second byte receive flag 1 Ready 0 Empty 0 R
D2 TRBS Transmit busy flag 1 Busy 0 Idle 0 R Shift register status
D1 RDRY Receive data ready flag 1 Ready 0 Empty 0 R
D0 TDBE Transmit data buffer empty flag 1 Empty 0 Not empty 1 R
UART Transmit
Data Register
(UART_TXD)
0x4101
(8 bits)
D7–0 TXD[7:0] Transmit data
TXD7(6) = MSB
TXD0 = LSB
0x0 to 0xff (0x7f) 0x0 R/W
UART Receive
Data Register
(UART_RXD)
0x4102
(8 bits)
D7–0 RXD[7:0] Receive data in the receive data
buffer
RXD7(6) = MSB
RXD0 = LSB
0x0 to 0xff (0x7f) 0x0 R Older data in the
buffer is read out
first.
UART Mode
Register
(UART_MOD)
0x4103
(8 bits)
D7–5 –reserved – – – 0 when being read.
D4 CHLN Character length 1 8 bits 0 7 bits 0 R/W
D3 PREN Parity enable 1 With parity 0 No parity 0 R/W
D2 PMD Parity mode select 1 Odd 0 Even 0 R/W
D1 STPB Stop bit select 1 2 bits 0 1 bit 0 R/W
D0 SSCK Input clock select 1 External 0 Internal 0 R/W
UART
Control
Register
(UART_CTL)
0x4104
(8 bits)
D7 –reserved – – – 0 when being read.
D6 REIEN Receive error int. enable 1 Enable 0 Disable 0 R/W
D5 RIEN Receive buffer full int. enable 1 Enable 0 Disable 0 R/W
D4 TIEN Transmit buffer empty int. enable 1 Enable 0 Disable 0 R/W
D3–2 –reserved – – – 0 when being read.
D1 RBFI Receive buffer full int. condition 1 2 bytes 0 1 byte 0 R/W
D0 RXEN UART enable 1 Enable 0 Disable 0 R/W
UART
Expansion
Register
(UART_EXP)
0x4105
(8 bits)
D7 –reserved – – – 0 when being read.
D6–4 IRCLK[2:0] IrDA receive detection clock
select
IRCLK[2:0] Clock 0x0 R/W
0x7
0x6
0x5
0x4
0x3
0x2
0x1
0x0
PCLK-1/128
PCLK-1/64
PCLK-1/32
PCLK-1/16
PCLK-1/8
PCLK-1/4
PCLK-1/2
PCLK-1/1
D3–1 –reserved – – – 0 when being read.
D0 IRMD IrDA mode select 1 On 0 Off 0 R/W
APPENDIX A I/O REGISTER LIST
312 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
0x4200–0x4206 8-bit Timer (with Fine Mode)
Register name Address Bit Name Function Setting Init. R/W Remarks
8-bit Timer
Input Clock
Select Register
(T8F_CLK)
0x4200
(16 bits)
D15–4 –reserved – – – 0 when being read.
D3–0 DF[3:0] Timer input clock select
(Prescaler output clock)
DF[3:0] Clock 0x0 R/W
0xf
0xe
0xd
0xc
0xb
0xa
0x9
0x8
0x7
0x6
0x5
0x4
0x3
0x2
0x1
0x0
reserved
PCLK-1/16384
PCLK-1/8192
PCLK-1/4096
PCLK-1/2048
PCLK-1/1024
PCLK-1/512
PCLK-1/256
PCLK-1/128
PCLK-1/64
PCLK-1/32
PCLK-1/16
PCLK-1/8
PCLK-1/4
PCLK-1/2
PCLK-1/1
8-bit Timer
Reload Data
Register
(T8F_TR)
0x4202
(16 bits)
D15–8 –reserved – – – 0 when being read.
D7–0 TR[7:0] 8-bit timer reload data
TR7 = MSB
TR0 = LSB
0x0 to 0xff 0x0 R/W
8-bit Timer
Counter Data
Register
(T8F_TC)
0x4204
(16 bits)
D15–8 –reserved – – – 0 when being read.
D7–0 TC[7:0] 8-bit timer counter data
TC7 = MSB
TC0 = LSB
0x0 to 0xff 0x0 R
8-bit Timer
Control Register
(T8F_CTL)
0x4206
(16 bits)
D15–12 –reserved – – – 0 when being read.
D11–8 TFMD[3:0] Fine mode setup 0x0 to 0xf 0x0 R/W
Set a number of times
to insert delay into a
16-underflow period.
D7–5 –reserved – – – 0 when being read.
D4 TRMD Count mode select 1 One shot 0 Repeat 0 R/W
D3–2 –reserved – – – 0 when being read.
D1 PRESER Timer reset 1 Reset 0 Ignored 0 W
D0 PRUN Timer run/stop control 1 Run 0 Stop 0 R/W
APPENDIX A I/O REGISTER LIST
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 313
0x4220–0x4246 16-bit Timer
Register name Address Bit Name Function Setting Init. R/W Remarks
16-bit Timer
Ch.0 Input
Clock Select
Register
(T16_CLK0)
0x4220
(16 bits)
D15–4 –reserved – – – 0 when being read.
D3–0 DF[3:0] Timer input clock select
(Prescaler output clock)
DF[3:0] Clock 0x0 R/W
0xf
0xe
0xd
0xc
0xb
0xa
0x9
0x8
0x7
0x6
0x5
0x4
0x3
0x2
0x1
0x0
reserved
PCLK-1/16384
PCLK-1/8192
PCLK-1/4096
PCLK-1/2048
PCLK-1/1024
PCLK-1/512
PCLK-1/256
PCLK-1/128
PCLK-1/64
PCLK-1/32
PCLK-1/16
PCLK-1/8
PCLK-1/4
PCLK-1/2
PCLK-1/1
16-bit Timer
Ch.0 Reload
Data Register
(T16_TR0)
0x4222
(16 bits)
D15–0 TR[15:0] 16-bit timer reload data
TR15 = MSB
TR0 = LSB
0x0 to 0xffff 0x0 R/W
16-bit Timer
Ch.0 Counter
Data Register
(T16_TC0)
0x4224
(16 bits)
D15–0 TC[15:0] 16-bit timer counter data
TC15 = MSB
TC0 = LSB
0x0 to 0xffff 0x0 R
16-bit Timer
Ch.0 Control
Register
(T16_CTL0)
0x4226
(16 bits)
D15–11 –reserved – – – 0 when being read.
D10 CKACTV External clock active level select 1 High 0 Low 1 R/W
D9–8 CKSL[1:0] Input clock and pulse width
measurement mode select
CKSL[1:0] Mode 0x0 R/W
0x3
0x2
0x1
0x0
reserved
Pulse width
External clock
Internal clock
D7–5 –reserved – – – 0 when being read.
D4 TRMD Count mode select 1 One shot 0 Repeat 0 R/W
D3–2 –reserved – – – 0 when being read.
D1 PRESER Timer reset 1 Reset 0 Ignored 0 W
D0 PRUN Timer run/stop control 1 Run 0 Stop 0 R/W
16-bit Timer
Ch.1 Input
Clock Select
Register
(T16_CLK1)
0x4240
(16 bits)
D15–4 –reserved – – – 0 when being read.
D3–0 DF[3:0] Timer input clock select
(Prescaler output clock)
DF[3:0] Clock 0x0 R/W
0xf
0xe
0xd
0xc
0xb
0xa
0x9
0x8
0x7
0x6
0x5
0x4
0x3
0x2
0x1
0x0
reserved
PCLK-1/16384
PCLK-1/8192
PCLK-1/4096
PCLK-1/2048
PCLK-1/1024
PCLK-1/512
PCLK-1/256
PCLK-1/128
PCLK-1/64
PCLK-1/32
PCLK-1/16
PCLK-1/8
PCLK-1/4
PCLK-1/2
PCLK-1/1
16-bit Timer
Ch.1 Reload
Data Register
(T16_TR1)
0x4242
(16 bits)
D15–0 TR[15:0] 16-bit timer reload data
TR15 = MSB
TR0 = LSB
0x0 to 0xffff 0x0 R/W
16-bit Timer
Ch.1 Counter
Data Register
(T16_TC1)
0x4244
(16 bits)
D15–0 TC[15:0] 16-bit timer counter data
TC15 = MSB
TC0 = LSB
0x0 to 0xffff 0x0 R
16-bit Timer
Ch.1 Control
Register
(T16_CTL1)
0x4246
(16 bits)
D15–11 –reserved – – – 0 when being read.
D10 CKACTV External clock active level select 1 High 0 Low 1 R/W
D9–8 CKSL[1:0] Input clock and pulse width
measurement mode select
CKSL[1:0] Mode 0x0 R/W
0x3
0x2
0x1
0x0
reserved
Pulse width
External clock
Internal clock
D7–5 –reserved – – – 0 when being read.
D4 TRMD Count mode select 1 One shot 0 Repeat 0 R/W
D3–2 –reserved – – – 0 when being read.
D1 PRESER Timer reset 1 Reset 0 Ignored 0 W
D0 PRUN Timer run/stop control 1 Run 0 Stop 0 R/W
APPENDIX A I/O REGISTER LIST
314 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
0x4260–0x4266 16-bit Timer
Register name Address Bit Name Function Setting Init. R/W Remarks
16-bit Timer
Ch.2 Input
Clock Select
Register
(T16_CLK2)
0x4260
(16 bits)
D15–4 –reserved – – – 0 when being read.
D3–0 DF[3:0] Timer input clock select
(Prescaler output clock)
DF[3:0] Clock 0x0 R/W
0xf
0xe
0xd
0xc
0xb
0xa
0x9
0x8
0x7
0x6
0x5
0x4
0x3
0x2
0x1
0x0
reserved
PCLK-1/16384
PCLK-1/8192
PCLK-1/4096
PCLK-1/2048
PCLK-1/1024
PCLK-1/512
PCLK-1/256
PCLK-1/128
PCLK-1/64
PCLK-1/32
PCLK-1/16
PCLK-1/8
PCLK-1/4
PCLK-1/2
PCLK-1/1
16-bit Timer
Ch.2 Reload
Data Register
(T16_TR2)
0x4262
(16 bits)
D15–0 TR[15:0] 16-bit timer reload data
TR15 = MSB
TR0 = LSB
0x0 to 0xffff 0x0 R/W
16-bit Timer
Ch.2 Counter
Data Register
(T16_TC2)
0x4264
(16 bits)
D15–0 TC[15:0] 16-bit timer counter data
TC15 = MSB
TC0 = LSB
0x0 to 0xffff 0x0 R
16-bit Timer
Ch.2 Control
Register
(T16_CTL2)
0x4266
(16 bits)
D15–11 –reserved – – – 0 when being read.
D10 CKACTV External clock active level select 1 High 0 Low 1 R/W
D9–8 CKSL[1:0] Input clock and pulse width
measurement mode select
CKSL[1:0] Mode 0x0 R/W
0x3
0x2
0x1
0x0
reserved
Pulse width
External clock
Internal clock
D7–5 –reserved – – – 0 when being read.
D4 TRMD Count mode select 1 One shot 0 Repeat 0 R/W
D3–2 –reserved – – – 0 when being read.
D1 PRESER Timer reset 1 Reset 0 Ignored 0 W
D0 PRUN Timer run/stop control 1 Run 0 Stop 0 R/W
APPENDIX A I/O REGISTER LIST
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 315
0x4300–0x4310 Interrupt Controller
Register name Address Bit Name Function Setting Init. R/W Remarks
Interrupt Flag
Register
(ITC_IFLG)
0x4300
(16 bits)
D15 IIFT7 I2C interrupt flag 1 Cause of
interrupt
occurred
0 Cause of
interrupt not
occurred
0 R/W Reset by writing 1.
D14 IIFT6 SPI interrupt flag 0 R/W
D13 IIFT5 Remote controller interrupt flag 0 R/W
D12 IIFT4 UART interrupt flag 0 R/W
D11 IIFT3 16-bit timer Ch.2 interrupt flag 0 R/W
D10 IIFT2 16-bit timer Ch.1 interrupt flag 0 R/W
D9 IIFT1 16-bit timer Ch.0 interrupt flag 0 R/W
D8 IIFT0 8-bit timer interrupt flag 0 R/W
D7 EIFT7 PWM&capture timer interrupt flag 1 Cause of
interrupt
occurred
0 Cause of
interrupt not
occurred
0 R/W Reset by writing 1 in
pulse trigger mode.
Cannot be reset by
software in level trig-
ger mode.
D6 EIFT6 reserved 0 R/W
D5 EIFT5 reserved 0 R/W
D4 EIFT4 8-bit OSC1 timer interrupt flag 0 R/W
D3 EIFT3 Clock timer interrupt flag 0 R/W
D2 EIFT2 Stopwatch timer interrupt flag 0 R/W
D1 EIFT1 P1 port interrupt flag 0 R/W
D0 EIFT0 P0 port interrupt flag 0 R/W
Interrupt
Enable Register
(ITC_EN)
0x4302
(16 bits)
D15 IIEN7 I2C interrupt enable 1 Enable 0 Disable 0 R/W
D14 IIEN6 SPI interrupt enable 0 R/W
D13 IIEN5 Remote controller interrupt enable 0 R/W
D12 IIEN4 UART interrupt enable 0 R/W
D11 IIEN3 16-bit timer Ch.2 interrupt enable 0 R/W
D10 IIEN2 16-bit timer Ch.1 interrupt enable 0 R/W
D9 IIEN1 16-bit timer Ch.0 interrupt enable 0 R/W
D8 IIEN0 8-bit timer interrupt enable 0 R/W
D7 EIEN7
PWM&capture timer interrupt enable
0 R/W
D6 EIEN6 reserved 0 R/W
D5 EIEN5 reserved 0 R/W
D4 EIEN4 8-bit OSC1 timer interrupt enable 0 R/W
D3 EIEN3 Clock timer interrupt enable 0 R/W
D2 EIEN2 Stopwatch timer interrupt enable 0 R/W
D1 EIEN1 P1 port interrupt enable 0 R/W
D0 EIEN0 P0 port interrupt enable 0 R/W
ITC Control
Register
(ITC_CTL)
0x4304
(16 bits)
D15–1 –reserved – – – 0 when being read.
D0 ITEN ITC enable 1 Enable 0 Disable 0 R/W
External
Interrupt Level
Setup Register 0
(ITC_ELV0)
0x4306
(16 bits)
D15–13 –reserved – – – 0 when being read.
D12 EITG1 P1 interrupt trigger mode 1 Level 0 Pulse 0 R/W Be sure to set to 1.
D11 –reserved – – – 0 when being read.
D10–8 EILV1[2:0] P1 interrupt level 0 to 7 0x0 R/W
D7–5 –reserved – – – 0 when being read.
D4 EITG0 P0 interrupt trigger mode 1 Level 0 Pulse 0 R/W Be sure to set to 1.
D3 –reserved – – – 0 when being read.
D2–0 EILV0[2:0] P0 interrupt level 0 to 7 0x0 R/W
External
Interrupt Level
Setup Register 1
(ITC_ELV1)
0x4308
(16 bits)
D15–13 –reserved – – – 0 when being read.
D12 EITG3 CT interrupt trigger mode 1 Level 0 Pulse 0 R/W Be sure to set to 1.
D11 –reserved – – – 0 when being read.
D10–8 EILV3[2:0] CT interrupt level 0 to 7 0x0 R/W
D7–5 –reserved – – – 0 when being read.
D4 EITG2 SWT interrupt trigger mode 1 Level 0 Pulse 0 R/W Be sure to set to 1.
D3 –reserved – – – 0 when being read.
D2–0 EILV2[2:0] SWT interrupt level 0 to 7 0x0 R/W
External
Interrupt Level
Setup Register 2
(ITC_ELV2)
0x430a
(16 bits)
D15–5 –reserved – – – 0 when being read.
D4 EITG4 T8OSC1 interrupt trigger mode 1 Level 0 Pulse 0 R/W Be sure to set to 1.
D3 –reserved – – – 0 when being read.
D2–0 EILV4[2:0] T8OSC1 interrupt level 0 to 7 0x0 R/W
External
Interrupt Level
Setup Register 3
(ITC_ELV3)
0x430c
(16 bits)
D15–13 –reserved – – – 0 when being read.
D12 EITG7 T16E interrupt trigger mode 1 Level 0 Pulse 0 R/W Be sure to set to 1.
D11 –reserved – – – 0 when being read.
D10–8 EILV7[2:0] T16E interrupt level 0 to 7 0x0 R/W
D7–0 –reserved – – – 0 when being read.
Internal
Interrupt Level
Setup Register 0
(ITC_ILV0)
0x430e
(16 bits)
D15–11 –reserved – – – 0 when being read.
D10–8 IILV1[2:0] T16 Ch.0 interrupt level 0 to 7 0x0 R/W
D7–3 –reserved – – – 0 when being read.
D2–0 IILV0[2:0] T8 interrupt level 0 to 7 0x0 R/W
Internal
Interrupt Level
Setup Register 1
(ITC_ILV1)
0x4310
(16 bits)
D15–11 –reserved – – – 0 when being read.
D10–8 IILV3[2:0] T16 Ch.2 interrupt level 0 to 7 0x0 R/W
D7–3 –reserved – – – 0 when being read.
D2–0 IILV2[2:0] T16 Ch.1 interrupt level 0 to 7 0x0 R/W
APPENDIX A I/O REGISTER LIST
316 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
0x4312–0x4314 Interrupt Controller
Register name Address Bit Name Function Setting Init. R/W Remarks
Internal
Interrupt Level
Setup Register 2
(ITC_ILV2)
0x4312
(16 bits)
D15–11 –reserved – – – 0 when being read.
D10–8 IILV5[2:0] REMC interrupt level 0 to 7 0x0 R/W
D7–3 –reserved – – – 0 when being read.
D2–0 IILV4[2:0] UART interrupt level 0 to 7 0x0 R/W
Internal
Interrupt Level
Setup Register 3
(ITC_ILV3)
0x4314
(16 bits)
D15–11 –reserved – – – 0 when being read.
D10–8 IILV7[2:0] I2C interrupt level 0 to 7 0x0 R/W
D7–3 –reserved – – – 0 when being read.
D2–0 IILV6[2:0] SPI interrupt level 0 to 7 0x0 R/W
APPENDIX A I/O REGISTER LIST
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 317
0x4320–0x4326 SPI
Register name Address Bit Name Function Setting Init. R/W Remarks
SPI Status
Register
(SPI_ST)
0x4320
(16 bits)
D15–3 –reserved – – – 0 when being read.
D2 SPBSY Transfer busy flag (master) 1 Busy 0 Idle 0 R
ss signal low flag (slave) 1 ss = L 0 ss = H
D1 SPRBF Receive data buffer full flag 1 Full 0 Not full 0 R
D0 SPTBE Transmit data buffer empty flag 1 Empty 0 Not empty 1 R
SPI Transmit
Data Register
(SPI_TXD)
0x4322
(16 bits)
D15–8 –reserved – – – 0 when being read.
D7–0 SPTDB[7:0] SPI transmit data buffer
SPTDB7 = MSB
SPTDB0 = LSB
0x0 to 0xff 0x0 R/W
SPI Receive
Data Register
(SPI_RXD)
0x4324
(16 bits)
D15–8 –reserved – – – 0 when being read.
D7–0 SPRDB[7:0] SPI receive data buffer
SPRDB7 = MSB
SPRDB0 = LSB
0x0 to 0xff 0x0 R
SPI Control
Register
(SPI_CTL)
0x4326
(16 bits)
D15–6 –reserved – – – 0 when being read.
D5 SPRIE Receive data buffer full int. enable 1 Enable 0 Disable 0 R/W
D4 SPTIE
Transmit data buffer empty int. enable
1 Enable 0 Disable 0 R/W
D3 CPHA Clock phase select 1 Data out 0 Data in 0 R/W These bits must be
set before setting
SPEN to 1.
D2 CPOL Clock polarity select 1 Active L 0 Active H 0 R/W
D1 MSSL Master/slave mode select 1 Master 0 Slave 0 R/W
D0 SPEN SPI enable 1 Enable 0 Disable 0 R/W
APPENDIX A I/O REGISTER LIST
318 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
0x4340–0x4346 I2C
Register name Address Bit Name Function Setting Init. R/W Remarks
I2C Enable
Register
(I2C_EN)
0x4340
(16 bits)
D15–1 –reserved – – – 0 when being read.
D0 I2CEN I2C enable 1 Enable 0 Disable 0 R/W
I2C Control
Register
(I2C_CTL)
0x4342
(16 bits)
D15–10 –reserved – – – 0 when being read.
D9 RBUSY Receive busy flag 1 Busy 0 Idle 0 R
D8 TBUSY Transmit busy flag 1 Busy 0 Idle 0 R
D7–5 –reserved – – – 0 when being read.
D4 NSERM Noise remove on/off 1 On 0 Off 0 R/W
D3–2 –reserved – – – 0 when being read.
D1 STP Stop control 1 Stop 0 Ignored 0 R/W
D0 STRT Start control 1 Start 0 Ignored 0 R/W
I2C Data
Register
(I2C_DAT)
0x4344
(16 bits)
D15–12 –reserved – – – 0 when being read.
D11 RBRDY Receive buffer ready 1 Ready 0 Empty 0 R
D10 RXE Receive execution 1 Receive 0 Ignored 0 R/W
D9 TXE Transmit execution 1 Transmit 0 Ignored 0 R/W
D8 RTACK Receive/transmit ACK 1 Error 0 ACK 0 R/W
D7–0 RTDT[7:0] Receive/transmit data
RTDT7 = MSB
RTDT0 = LSB
0x0 to 0xff 0x0 R/W
I2C Interrupt
Control Register
(I2C_ICTL)
0x4346
(16 bits)
D15–2 –reserved – – – 0 when being read.
D1 RINTE Receive interrupt enable 1 Enable 0 Disable 0 R/W
D0 TINTE Transmit interrupt enable 1 Enable 0 Disable 0 R/W
APPENDIX A I/O REGISTER LIST
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 319
0x5000–0x5003 Clock Timer
Register name Address Bit Name Function Setting Init. R/W Remarks
Clock Timer
Control Register
(CT_CTL)
0x5000
(8 bits)
D7–5 –reserved – – – 0 when being read.
D4 CTRST Clock timer reset 1 Reset 0 Ignored 0 W
D3–1 –reserved – – –
D0 CTRUN Clock timer run/stop control 1 Run 0 Stop 0 R/W
Clock Timer
Counter Register
(CT_CNT)
0x5001
(8 bits)
D7–0 CTCNT[7:0] Clock timer counter value 0x0 to 0xff 0 R
Clock Timer
Interrupt Mask
Register
(CT_IMSK)
0x5002
(8 bits)
D7–4 –reserved – – – 0 when being read.
D3 CTIE32 32 Hz interrupt enable 1 Enable 0 Disable 0 R/W
D2 CTIE8 8 Hz interrupt enable 1 Enable 0 Disable 0 R/W
D1 CTIE2 2 Hz interrupt enable 1 Enable 0 Disable 0 R/W
D0 CTIE1 1 Hz interrupt enable 1 Enable 0 Disable 0 R/W
Clock Timer
Interrupt Flag
Register
(CT_IFLG)
0x5003
(8 bits)
D7–4 –reserved – – – 0 when being read.
D3 CTIF32 32 Hz interrupt flag 1 Cause of
interrupt
occurred
0 Cause of
interrupt not
occurred
0 R/W Reset by writing 1.
D2 CTIF8 8 Hz interrupt flag 0 R/W
D1 CTIF2 2 Hz interrupt flag 0 R/W
D0 CTIF1 1 Hz interrupt flag 0 R/W
APPENDIX A I/O REGISTER LIST
320 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
0x5020–0x5023 Stopwatch Timer
Register name Address Bit Name Function Setting Init. R/W Remarks
Stopwatch
Timer
Control
Register
(SWT_CTL)
0x5020
(8 bits)
D7–5 –reserved – – – 0 when being read.
D4 SWTRST Stopwatch timer reset 1 Reset 0 Ignored 0 W
D3–1 –reserved – – –
D0 SWTRUN Stopwatch timer run/stop control 1 Run 0 Stop 0 R/W
Stopwatch
Timer BCD
Counter Register
(SWT_BCNT)
0x5021
(8 bits)
D7–4
BCD10[3:0] 1/10 sec. BCD counter value 0 to 9 0 R
D3–0
BCD100[3:0]
1/100 sec. BCD counter value 0 to 9 0 R
Stopwatch
Timer Interrupt
Mask Register
(SWT_IMSK)
0x5022
(8 bits)
D7–3 –reserved – – – 0 when being read.
D2 SIE1 1 Hz interrupt enable 1 Enable 0 Disable 0 R/W
D1 SIE10 10 Hz interrupt enable 1 Enable 0 Disable 0 R/W
D0 SIE100 100 Hz interrupt enable 1 Enable 0 Disable 0 R/W
Stopwatch
Timer Interrupt
Flag Register
(SWT_IFLG)
0x5023
(8 bits)
D7–3 –reserved – – – 0 when being read.
D2 SIF1 1 Hz interrupt flag 1 Cause of
interrupt
occurred
0 Cause of
interrupt not
occurred
0 R/W Reset by writing 1.
D1 SIF10 10 Hz interrupt flag 0 R/W
D0 SIF100 100 Hz interrupt flag 0 R/W
APPENDIX A I/O REGISTER LIST
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 321
0x5040–0x5041 Watchdog Timer
Register name Address Bit Name Function Setting Init. R/W Remarks
Watchdog
Timer
Control
Register
(WDT_CTL)
0x5040
(8 bits)
D7–5 –reserved – – – 0 when being read.
D4 WDTRST Watchdog timer reset 1 Reset 0 Ignored 0 W
D3–0
WDTRUN[3:0]
Watchdog timer run/stop control
Other than 1010
Run
1010
Stop
1010 R/W
Watchdog
Timer Status
Register
(WDT_ST)
0x5041
(8 bits)
D7–2 –reserved – – – 0 when being read.
D1 WDTMD NMI/Reset mode select 1 Reset 0 NMI 0 R/W
D0 WDTST NMI status 1
NMI occurred
0
Not occurred
0 R
APPENDIX A I/O REGISTER LIST
322 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
0x5060–0x5065 Oscillator
Register name Address Bit Name Function Setting Init. R/W Remarks
Clock Source
Select
Register
(OSC_SRC)
0x5060
(8 bits)
D7–1
–
reserved – – – 0 when being read.
D0 CLKSRC System clock source select 1 OSC1 0 OSC3 0 R/W
Oscillation
Control Register
(OSC_CTL)
0x5061
(8 bits)
D7–6 –reserved – – – 0 when being read.
D5–4
OSC3WT[1:0]
OSC3 wait cycle select OSC3WT[1:0] Wait cycle 0x0 R/W
0x3
0x2
0x1
0x0
128 cycles
256 cycles
512 cycles
1024 cycles
D3–2 –reserved – – – 0 when being read.
D1 OSC1EN OSC1 enable 1 Enable 0 Disable 1 R/W
D0 OSC3EN OSC3 enable 1 Enable 0 Disable 1 R/W
Noise Filter
Enable Register
(OSC_NFEN)
0x5062
(8 bits)
D7–2 –reserved – – – 0 when being read.
D1 RSTFE Reset noise filter enable 1 Enable 0 Disable 1 R/W
D0 NMIFE NMI noise filter enable 1 Enable 0 Disable 1 R/W
FOUT Control
Register
(OSC_FOUT
)
0x5064
(8 bits)
D7–4 –reserved – – – 0 when being read.
D3–2
FOUT3D[1:0]
FOUT3 clock division ratio select FOUT3D[1:0] Division ratio 0x0 R/W
0x3
0x2
0x1
0x0
reserved
OSC3-1/4
OSC3-1/2
OSC3-1/1
D1 FOUT3E FOUT3 output enable 1 Enable 0 Disable 0 R/W
D0 FOUT1E FOUT1 output enable 1 Enable 0 Disable 0 R/W
T8OSC1 Clock
Control Register
(OSC_T8OSC1
)
0x5065
(8 bits)
D7–4 –reserved – – – 0 when being read.
D3–1
T8O1CK[2:0]
T8OSC1 clock division ratio select T8O1CK[2:0] Division ratio 0x0 R/W
0x7–0x6
0x5
0x4
0x3
0x2
0x1
0x0
reserved
OSC1-1/32
OSC1-1/16
OSC1-1/8
OSC1-1/4
OSC1-1/2
OSC1-1/1
D0 T8O1CE T8OSC1 clock output enable 1 Enable 0 Disable 0 R/W
APPENDIX A I/O REGISTER LIST
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 323
0x5080–0x5081 Clock Generator
Register name Address Bit Name Function Setting Init. R/W Remarks
PCLK Control
Register
(CLG_PCLK
)
0x5080
(8 bits)
D7–2 –reserved – – – 0 when being read.
D1–0 PCKEN[1:0] PCLK enable PCKEN[1:0] PCLK supply 0x3 R/W
0x3
0x2
0x1
0x0
Enable
Not allowed
Not allowed
Disable
CCLK Control
Register
(CLG_CCLK
)
0x5081
(8 bits)
D7–2 –reserved – – – 0 when being read.
D1–0 CCLK-
GR[1:0]
CCLK clock gear ratio select CCLKGR[1:0] Gear ratio 0x0 R/W
0x3
0x2
0x1
0x0
1/8
1/4
1/2
1/1
APPENDIX A I/O REGISTER LIST
324 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
0x50c0–0x50c4 8-bit OSC1 Timer
Register name Address Bit Name Function Setting Init. R/W Remarks
8-bit OSC1
Timer Control
Register
(T8OSC1_CTL)
0x50c0
(8 bits)
D7–5 –reserved – – – 0 when being read.
D4 T8ORST Timer reset 1 Reset 0 Ignored 0 W
D3–2 –reserved – – –
D1 T8ORMD Count mode select 1 One shot 0 Repeat 0 R/W
D0 T8ORUN Timer run/stop control 1 Run 0 Stop 0 R/W
8-bit OSC1
Timer Counter
Data Register
(T8OSC1_CNT)
0x50c1
(8 bits)
D7–0
T8OCNT[7:0]
Timer counter data
T8OCNT7 = MSB
T8OCNT0 = LSB
0x0 to 0xff 0xff R
8-bit OSC1
Timer Compare
Data Register
(T8OSC1_CMP)
0x50c2
(8 bits)
D7–0
T8OCMP[7:0]
Compare data
T8OCMP7 = MSB
T8OCMP0 = LSB
0x0 to 0xff 0x0 R/W
8-bit OSC1
Timer Interrupt
Mask Register
(T8OSC1_IMSK)
0x50c3
(8 bits)
D7–1 –reserved – – – 0 when being read.
D0 T8OIE 8-bit OSC1 timer interrupt enable 1 Enable 0 Disable 0 R/W
8-bit OSC1
Timer Interrupt
Flag Register
(T8OSC1_IFLG)
0x50c4
(8 bits)
D7–1 –reserved – – – 0 when being read.
D0 T8OIF 8-bit OSC1 timer interrupt flag 1 Cause of
interrupt
occurred
0 Cause of
interrupt not
occurred
0 R/W Reset by writing 1.
APPENDIX A I/O REGISTER LIST
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 325
0x5200–0x5216 P Port & Port MUX
Register name Address Bit Name Function Setting Init. R/W Remarks
P0 Port Input
Data Register
(P0_IN)
0x5200
(8 bits)
D7–0 P0IN[7:0] P0[7:0] port input data 1 1 (H) 0 0 (L) × R
P0 Port Output
Data Register
(P0_OUT)
0x5201
(8 bits)
D7–0 P0OUT[7:0] P0[7:0] port output data 1 1 (H) 0 0 (L) 0 R/W
P0 Port
I/O Direction
Control Register
(P0_IO)
0x5202
(8 bits)
D7–0 P0IO[7:0] P0[7:0] port I/O direction select 1 Output 0 Input 0 R/W
P0 Port Pull-up
Control Register
(P0_PU)
0x5203
(8 bits)
D7–0 P0PU[7:0] P0[7:0] port pull-up enable 1 Enable 0 Disable 1
(0xff)
R/W
P0 Port
Interrupt Mask
Register
(P0_IMSK)
0x5205
(8 bits)
D7–0 P0IE[7:0] P0[7:0] port interrupt enable 1 Enable 0 Disable 0 R/W
P0 Port
Interrupt Edge
Select Register
(P0_EDGE)
0x5206
(8 bits)
D7–0
P0EDGE[7:0]
P0[7:0] port interrupt edge select 1 Falling edge 0 Rising edge 0 R/W
P0 Port
Interrupt Flag
Register
(P0_IFLG)
0x5207
(8 bits)
D7–0 P0IF[7:0] P0[7:0] port interrupt flag 1 Cause of
interrupt
occurred
0 Cause of
interrupt not
occurred
0 R/W Reset by writing 1.
P0 Port
Chattering
Filter Control
Register
(P0_CHAT)
0x5208
(8 bits)
D7 –reserved – – – 0 when being read.
D6–4 P0CF2[2:0] P0[7:4] chattering filter time P0CF2[2:0] Filter time 0 R/W
0x7
0x6
0x5
0x4
0x3
0x2
0x1
0x0
16384/fPCLK
8192/fPCLK
4096/fPCLK
2048/fPCLK
1024/fPCLK
512/fPCLK
256/fPCLK
None
0x0 R/W
D3 –reserved – – – 0 when being read.
D2–0 P0CF1[2:0] P0[3:0] chattering filter time P0CF1[2:0] Filter time 0x0 R/W
0x7
0x6
0x5
0x4
0x3
0x2
0x1
0x0
16384/fPCLK
8192/fPCLK
4096/fPCLK
2048/fPCLK
1024/fPCLK
512/fPCLK
256/fPCLK
None
P0 Port Key-
Entry Reset
Configuration
Register
(P0_KRST)
0x5209
(8 bits)
D7–2 –reserved – – – 0 when being read.
D1–0
P0KRST[1:0]
P0 port key-entry reset
configuration
P0KRST[1:0] Configuration 0x0 R/W
0x3
0x2
0x1
0x0
P0[3:0] = 0
P0[2:0] = 0
P0[1:0] = 0
Disable
P1 Port Input
Data Register
(P1_IN)
0x5210
(8 bits)
D7–0 P1IN[7:0] P1[7:0] port input data 1 1 (H) 0 0 (L) × R
P1 Port Output
Data Register
(P1_OUT)
0x5211
(8 bits)
D7–0 P1OUT[7:0] P1[7:0] port output data 1 1 (H) 0 0 (L) 0 R/W
P1 Port
I/O Direction
Control Register
(P1_IO)
0x5212
(8 bits)
D7–0 P1IO[7:0] P1[7:0] port I/O direction select 1 Output 0 Input 0 R/W
P1 Port Pull-up
Control Register
(P1_PU)
0x5213
(8 bits)
D7–0 P1PU[7:0] P1[7:0] port pull-up enable 1 Enable 0 Disable 1
(0xff)
R/W
P1 Port
Interrupt Mask
Register
(P1_IMSK)
0x5215
(8 bits)
D7–0 P1IE[7:0] P1[7:0] port interrupt enable 1 Enable 0 Disable 0 R/W
P1 Port
Interrupt Edge
Select Register
(P1_EDGE)
0x5216
(8 bits)
D7–0
P1EDGE[7:0]
P1[7:0] port interrupt edge select 1 Falling edge 0 Rising edge 0 R/W
APPENDIX A I/O REGISTER LIST
326 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
0x5217–0x52a3 P Port & Port MUX
Register name Address Bit Name Function Setting Init. R/W Remarks
P1 Port
Interrupt Flag
Register
(P1_IFLG)
0x5217
(8 bits)
D7–0 P1IF[7:0] P1[7:0] port interrupt flag 1 Cause of
interrupt
occurred
0 Cause of
interrupt not
occurred
0 R/W Reset by writing 1.
P2 Port Input
Data Register
(P2_IN)
0x5220
(8 bits)
D7–0 P2IN[7:0] P2[7:0] port input data 1 1 (H) 0 0 (L) × R
P2 Port Output
Data Register
(P2_OUT)
0x5221
(8 bits)
D7–0 P2OUT[7:0] P2[7:0] port output data 1 1 (H) 0 0 (L) 0 R/W
P2 Port
I/O Direction
Control Register
(P2_IO)
0x5222
(8 bits)
D7–0 P2IO[7:0] P2[7:0] port I/O direction select 1 Output 0 Input 0 R/W
P2 Port Pull-up
Control Register
(P2_PU)
0x5223
(8 bits)
D7–0 P2PU[7:0] P2[7:0] port pull-up enable 1 Enable 0 Disable 1
(0xff)
R/W
P3 Port Input
Data Register
(P3_IN)
0x5230
(8 bits)
D7–4 –reserved – – – 0 when being read.
D3–0 P3IN[3:0] P3[3:0] port input data 1 1 (H) 0 0 (L) × R
P3 Port Output
Data Register
(P3_OUT)
0x5231
(8 bits)
D7–4 –reserved – – – 0 when being read.
D3–0 P3OUT[3:0] P3[3:0] port output data 1 1 (H) 0 0 (L) 0 R/W
P3 Port
I/O Direction
Control Register
(P3_IO)
0x5232
(8 bits)
D7–4 –reserved – – – 0 when being read.
D3–0 P3IO[3:0] P3[3:0] port I/O direction select 1 Output 0 Input 0 R/W
P3 Port Pull-up
Control Register
(P3_PU)
0x5233
(8 bits)
D7–4 –reserved – – – 0 when being read.
D3–0 P3PU[3:0] P3[3:0] port pull-up enable 1 Enable 0 Disable 1
(0xff)
R/W
P0 Port
Function Select
Register
(P0_PMUX)
0x52a0
(8 bits)
D7–6 –reserved – – – 0 when being read.
D5 P05MUX P05 port function select 1 REMO 0 P05 0 R/W
D4 P04MUX P04 port function select 1 REMI 0 P04 0 R/W
D3–0 –reserved – – – 0 when being read.
P1 Port
Function Select
Register
(P1_PMUX)
0x52a1
(8 bits)
D7 P17MUX P17 port function select 1 #SPISS 0 P17 0 R/W
D6 –reserved – – – 0 when being read.
D5 P15MUX P15 port function select 1 SCL 0 P15 0 R/W
D4 P14MUX P14 port function select 1 SDA 0 P14 0 R/W
D3 P13MUX P13 port function select 1 FOUT1 0 P13 0 R/W
D2–0 –reserved – – – 0 when being read.
P2 Port
Function Select
Register
(P2_PMUX)
0x52a2
(8 bits)
D7 P27MUX P27 port function select 1 EXCL3 0 P27 0 R/W
D6 P26MUX P26 port function select 1 TOUT 0 P26 0 R/W
D5 P25MUX P25 port function select 1 SCLK 0 P25 0 R/W
D4 P24MUX P24 port function select 1 SOUT 0 P24 0 R/W
D3 P23MUX P23 port function select 1 SIN 0 P23 0 R/W
D2 P22MUX P22 port function select 1 SPICLK 0 P22 0 R/W
D1 P21MUX P21 port function select 1 SDO 0 P21 0 R/W
D0 P20MUX P20 port function select 1 SDI 0 P20 0 R/W
P3 Port
Function Select
Register
(P3_PMUX)
0x52a3
(8 bits)
D7–4 –reserved – – – 0 when being read.
D3 P33MUX P33 port function select 1 P33 0 DSIO 0 R/W
D2 P32MUX P32 port function select 1 P32 0 DST2 0 R/W
D1 P31MUX P31 port function select 1 P31 0 DCLK 0 R/W
D0 P30MUX P30 port function select 1 FOUT3 0 P30 0 R/W
APPENDIX A I/O REGISTER LIST
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 327
0x5300–0x530c PWM & Capture Timer
Register name Address Bit Name Function Setting Init. R/W Remarks
PWM Timer
Compare Data
A Register
(T16E_CA)
0x5300
(16 bits)
D15–0
T16ECA[15:0]
Compare data A
T16ECA15 = MSB
T16ECA0 = LSB
0x0 to 0xffff 0x0 R/W
PWM Timer
Compare Data
B Register
(T16E_CB)
0x5302
(16 bits)
D15–0
T16ECB[15:0]
Compare data B
T16ECB15 = MSB
T16ECB0 = LSB
0x0 to 0xffff 0x0 R/W
PWM Timer
Counter Data
Register
(T16E_TC)
0x5304
(16 bits)
D15–0
T16ETC[15:0]
Counter data
T16ETC15 = MSB
T16ETC0 = LSB
0x0 to 0xffff 0x0 R/W
PWM Timer
Control Register
(T16E_CTL)
0x5306
(16 bits)
D15–9 –reserved – – – 0 when being read.
D8 INITOL Initial output level 1 High 0 Low 0 R/W
D7 –reserved – – – 0 when being read.
D6 SELFM Fine mode select 1 Fine mode 0 Normal
mode
0 R/W
D5 CBUFEN Comparison buffer enable 1 Enable 0 Disable 0 R/W
D4 INVOUT Inverse output 1 Invert 0 Normal 0 R/W
D3 CLKSEL Input clock select 1 External 0 Internal 0 R/W
D2 OUTEN Clock output enable 1 Enable 0 Disable 0 R/W
D1 T16ERST Timer reset 1 Reset 0 Ignored 0 W 0 when being read.
D0 T16ERUN Timer run/stop control 1 Run 0 Stop 0 R/W
PWM Timer
Input Clock
Select Register
(T16E_CLK)
0x5308
(16 bits)
D15–4 –reserved – – – 0 when being read.
D3–0
T16EDF[3:0]
Timer input clock select
(Prescaler output clock)
T16EDF[3:0] Clock 0x0 R/W
0xf
0xe
0xd
0xc
0xb
0xa
0x9
0x8
0x7
0x6
0x5
0x4
0x3
0x2
0x1
0x0
reserved
PCLK-1/16384
PCLK-1/8192
PCLK-1/4096
PCLK-1/2048
PCLK-1/1024
PCLK-1/512
PCLK-1/256
PCLK-1/128
PCLK-1/64
PCLK-1/32
PCLK-1/16
PCLK-1/8
PCLK-1/4
PCLK-1/2
PCLK-1/1
PWM Timer
Interrupt
Mask Register
(T16E_IMSK)
0x530a
(16 bits)
D15–2 –reserved – – – 0 when being read.
D1 CBIE Compare B interrupt enable 1 Enable 0 Disable 0 R/W
D0 CAIE Compare A interrupt enable 1 Enable 0 Disable 0 R/W
PWM Timer
Interrupt
Flag Register
(T16E_IFLG)
0x530c
(16 bits)
D15–2 –reserved – – – 0 when being read.
D1 CBIF Compare B interrupt flag 1 Cause of
interrupt
occurred
0 Cause of
interrupt not
occurred
0 R/W Reset by writing 1.
D0 CAIF Compare A interrupt flag 0 R/W
APPENDIX A I/O REGISTER LIST
328 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
0x5320–0x5322 MISC Registers
Register name Address Bit Name Function Setting Init. R/W Remarks
ROM
Control Register
(MISC_FL)
0x5320
(8 bits)
D7–3 –reserved – – – 0 when being read.
D2–0 FLCYC[2:0] ROM read access cycle FLCYC[2:0] Read cycle 0x3 R/W
0x7–0x5
0x4
0x3
0x2
0x1
0x0
reserved
1 cycle
5 cycles
4 cycles
3 cycles
2 cycles
OSC1 Peripheral
Control Register
(MISC_OSC1)
0x5322
(8 bits)
D7–1 –reserved – – – 0 when being read.
D0 O1DBG OSC1 peripheral control in debug
mode
1 Run 0 Stop 0 R/W
APPENDIX A I/O REGISTER LIST
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 329
0x5340–0x5347 Remote Controller
Register name Address Bit Name Function Setting Init. R/W Remarks
REMC
Configuration
Register
(REMC_CFG)
0x5340
(8 bits)
D7–2 –reserved – – – 0 when being read.
D1 REMMD REMC mode select 1 Receive 0 Transmit 0 R/W
D0 REMEN REMC enable 1 Enable 0 Disable 0 R/W
REMC
Prescaler Clock
Select Register
(REMC_PSC)
0x5341
(8 bits)
D7–4 CGCLK[3:0] Carrier generator clock select
(Prescaler output clock)
CGCLK[3:0]
LCCLK[3:0] Clock 0x0 R/W
0xf
0xe
0xd
0xc
0xb
0xa
0x9
0x8
0x7
0x6
0x5
0x4
0x3
0x2
0x1
0x0
reserved
PCLK-1/16384
PCLK-1/8192
PCLK-1/4096
PCLK-1/2048
PCLK-1/1024
PCLK-1/512
PCLK-1/256
PCLK-1/128
PCLK-1/64
PCLK-1/32
PCLK-1/16
PCLK-1/8
PCLK-1/4
PCLK-1/2
PCLK-1/1
D3–0 LCCLK[3:0] Length counter clock select
(Prescaler output clock)
0x0 R/W
REMC H Carrier
Length Setup
Register
(REMC_CARH)
0x5342
(8 bits)
D7–6 –reserved – – – 0 when being read.
D5–0
REMCH[5:0]
H carrier length setup 0x0 to 0x3f 0x0 R/W
REMC L Carrier
Length Setup
Register
(REMC_CARL)
0x5343
(8 bits)
D7–6 –reserved – – – 0 when being read.
D5–0 REMCL[5:0] L carrier length setup 0x0 to 0x3f 0x0 R/W
REMC
Status Register
(REMC_ST)
0x5344
(8 bits)
D7–1 –reserved – – – 0 when being read.
D0 REMDT Transmit/receive data 1 1 (H) 0 0 (L) 0 R/W
REMC Length
Counter Register
(REMC_LCNT)
0x5345
(8 bits)
D7–0
REMLEN[7:0]
Transmit/receive data length count
(down counter)
0x0 to 0xff 0x0 R/W
REMC Interrupt
Mask Register
(REMC_IMSK)
0x5346
(8 bits)
D7–3 –reserved – – – 0 when being read.
D2 REMFIE Falling edge interrupt enable 1 Enable 0 Disable 0 R/W
D1 REMRIE Rising edge interrupt enable 1 Enable 0 Disable 0 R/W
D0 REMUIE Underflow interrupt enable 1 Enable 0 Disable 0 R/W
REMC Interrupt
Flag Register
(REMC_IFLG)
0x5347
(8 bits)
D7–3 –reserved – – – 0 when being read.
D2 REMFIF Falling edge interrupt flag 1 Cause of
interrupt
occurred
0 Cause of
interrupt not
occurred
0 R/W Reset by writing 1.
D1 REMRIF Rising edge interrupt flag 0 R/W
D0 REMUIF Underflow interrupt flag 0 R/W
APPENDIX A I/O REGISTER LIST
330 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
0xffff80–0xffff90 S1C17 Core I/O
Register name Address Bit Name Function Setting Init. R/W Remarks
Vector Table
Base Register
(TTBR)
0xffff80
(32 bits)
D31–24 –Unused (fixed at 0) 0x0 0x0 R
D23–0 TTBR[23:0] Vector table base address 0x8000 0x80
00
R
Processor ID
Register
(IDIR)
0xffff84
(8 bits)
D7–0 IDIR[7:0] Processor ID
0x10: S1C17 Core
0x10 0x10 R
Debug RAM
Base Register
(DBRAM)
0xffff90
(32 bits)
D31–24 –Unused (fixed at 0) 0x0 0x0 R
D23–0
DBRAM[23:0]
Debug RAM base address 0x7c0
0x7c0
R
APPENDIX B POWER SAVING
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 331
AppendixB:PowerSaving
Current consumption will vary dramatically, depending on CPU operating mode, operation clock frequency, and
the peripheral circuits being operated. Listed below are the control methods for saving power.
B.1 Clock Control Power Saving
Figure B.1.1 illustrates the S1C17001 clock system.
OSC3
CCLK
OSC1
OSC1
FOUT3
output circuit
OSC3
oscillator circuit
(8.2MHz)
OSC1
oscillator circuit
(32.768kHz)
Division circuit
(1/1 to 1/4)
Wakeup
wait circuit Clock gear
(1/1 to 1/8)
Gate S1C17 core
BCLK Internal bus, RAM,
ROM
ITC, T16, T8F, UART,
SPI, I2C, T16E, P,
MISC, REMC,
Control resistor (CT,
SWT, WDT, T8OSC1)
PCLK
CLK_256Hz
OSC3
OSC4
Clock source
selection
System
clock
FOUT3
FOUT1
output circuit
FOUT1
Noise filter
RESET
OSC1
OSC2
Gear selection
wakeup HALT
On/Off control
S1C17 core
S1C17 core
Division ratio
selection
Division circuit
(1/1 to 1/16K)
Division ratio selection On/Off control
On/Off control
On/Off control
SLEEP, On/Off control
SLEEP, On/Off control
Noise filter
NMI
On/Off control
CT, SWT, WDT
T8OSC1
Division
circuit (1/128)
(1/1 to 1/32)
Gate
Gate
On/Off control
On/Off control
Gate
CLG
PSC
OSC
T8F, T16, T16E,
REMC, P, UART, SPI,
I2C
Gate
HALT
Figure B.1.1 Clock system
APPENDIX B POWER SAVING
332 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
This section describes clock systems that can be controlled via software and power-saving control details. For more
information on control registers and control methods, refer to the respective module sections.
System SLEEP (All clocks stopped)
• Execute slp command
Execute the slp command when the entire system can be stopped. The CPU switches to SLEEP mode and
the system clocks stop. This also stops all peripheral circuits using clocks. Starting up the CPU from SLEEP
mode is therefore limited to startup using ports (described later).
System clocks
• Clock source selection (OSC module)
Select between OSC3 and OSC1 for the system clock source. Reduce current consumption by selecting the
OSC1 clock when low-speed processing is possible.
• OSC3 oscillation circuit stop (OSC module)
Operate the oscillation circuit comprising the system clock source. Where possible, stop the other circuit.
You can reduce current consumption by using OSC1 as the system clock and stopping the OSC3 oscillation
circuit.
CPU clock (CCLK)
• Execute the halt command
Execute the halt command when program execution by the CPU is not required—for example, when only
the display is required or for interrupt standby. The CPU switches to HALT mode and suspends operations,
but the peripheral circuits maintain the status in place at the time of the halt command, enabling use of pe-
ripheral circuits for timers and interrupts. You can reduce power consumption even further by suspending un-
necessary peripheral circuits before executing the halt command. The CPU is started from HALT mode using
the port or interrupts from the peripheral circuit operating in HALT mode.
• Low-speed clock gear selection (CLG module)
The CLG module can reduce CPU clock speeds to between 1/1 and 1/8 of the system clock via the clock gear
settings. Reduce current consumption by operating the CPU at the minimum speed required for applications.
Peripheral clock (PCLK)
• PCLK stop (CLG module)
Stop the PCLK clock feed from the CLG to peripheral circuits if none of the following peripheral circuits is
required.
Peripheral circuits operating with PCLK
• Prescaler (PWM & capture timer, remote controller, P port)
• UART
• 8-bit timer
• 16-bit timer Ch.0 to Ch.2
• Interrupt controller
• SPI
• I2C
• P port and port MUX (control register, chattering filter)
• PWM & capture timer
• MISC register
• Remote controller
APPENDIX B POWER SAVING
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 333
The peripheral modules listed below are operated by clocks other than PCLK, except for control register ac-
cess.
This means PCLK is not required after the control register has been set and operation started.
• Clock timer
• Stopwatch timer
• Watchdog timer
• 8-bit OSC1 timer
Maskable interrupts do not occur while PCLK is stopped. Interrupts are retained until the PCLK feed is re-
started.
Table B.1.1 shows a list of methods for clock control and starting/stopping the CPU.
Table B.1.1: Clock control list
Current con-
sumption
OSC1 OSC3 CPU (CCLK) PCLK
peripheral
OSC1
peripheral
CPU stop
method
CPU startup
method
Low Stop Stop Stop Stop Stop Execute slp
command 1
Oscillation
(system CLK) Stop Stop Stop Operation Execute halt
command 1, 2
Oscillation
(system CLK) Stop Stop Operation Operation Execute halt
command 1, 2, 3
Oscillation Stop Operation(1/1) Operation Operation
Oscillation Oscillation
(system CLK) Stop Operation Operation Execute halt
command 1, 2, 3
Oscillation Oscillation
(system CLK)
Operation
(Low gear) Operation Operation
High Oscillation Oscillation
(system CLK) Operation(1/1) Operation Operation
Canceling HALT and SLEEP modes (CPU startup methods)
1. Port startup
Started by input/output port interrupt factors or debug interrupts (ICD forced breaking). If the interrupt control-
ler or CPU IE flag blocks input/output port interrupts, the CPU executes commands following the halt or slp
commands without accepting the interrupt. If interrupts are permitted and PCLK was running before the halt
or slp commands were executed, the CPU branches to an interrupt processing routine. If PCLK was stopped
before the halt or slp commands were executed, branching to the interrupt processing routine is retained
until PCLK runs, even when interrupts are permitted.
2. OSC1 peripheral circuit startup
Started by clock timer, stopwatch timer, watchdog timer, or 8-bit OSC1 timer interrupt factors. If the interrupt
controller or CPU IE flag blocks these interrupts, the CPU executes commands following the halt command
without accepting the interrupt. If interrupts are permitted and PCLK was running before the halt command
was executed, the CPU branches to an interrupt processing routine. If PCLK was stopped before the halt
command was executed, branching to the interrupt processing routine is retained until PCLK runs, even when
interrupts are permitted.
3. PCLK peripheral circuit startup
Started by PCLK peripheral circuit interrupt factors permitted by the interrupt controller. If the CPU IE flag is 0,
the CPU executes commands following the halt command, rejecting the interrupt. If the IE flag is 1, the CPU
branches to an interrupt processing routine.
APPENDIX C MOUNTING PRECAUTIONS
334 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
AppendixC:MountingPrecautions
This section describes various precautions for circuit board design and IC mounting.
Oscillator circuit
• Oscillation characteristics depend on factors such as components used (oscillator, Rf, CG, CD) and circuit
board patterns. In particular, with ceramic or crystal oscillators, select the appropriate external resistors (Rf,)
and capacitors (CG, CD) only after fully evaluating components actually mounted on the circuit board.
• Oscillator clock disturbances caused by noise may cause malfunctions. To prevent such disturbances, consid-
er the following points. The latest devices, in particular, are manufactured by microscopic processes, making
them especially susceptible to noise.
Areas in which noise countermeasures are especially important include the OSC2 pin and related circuit
components and wiring. OSC1 pin handling is equally important. The noise precautions required for the
OSC1 and OSC2 pins are described below.
We also recommend applying similar noise countermeasures to high-speed oscillator circuits, such as the
OSC3 and OSC4 pins and wiring.
(1) Components such as oscillators, resistors, and capacitors connected to the OSC1 (OSC3) and OSC2 (OSC4)
pins should have the shortest connections possible.
(2) Wherever possible, avoid locating digital signal lines within 3 mm of the OSC1 (OSC3) and OSC2 (OSC4)
pins or related circuit components and wiring. Rapidly-switching signals, in particular, should be kept at a dis-
tance from these components. Since the spacing between layers of multi-layer printed circuit boards is a mere 0.1
mm to 0.2 mm, the above precautions also apply when positioning digital signal lines on other layers.
Never place digital signal lines alongside such components or wiring, even if more than 3 mm distance or
located on other layers. Avoid crossing wires.
(3) Use VSS to shield OSC1 (OSC3) and OSC2 (OSC4) pins and related wiring (including wiring for adjacent
circuit board layers).
Fully ground adjacent layers, where possible. At minimum, shield the area at least 5 mm around the above
pins and wiring.
Even after implementing these precautions, avoid configuring digital signal lines in parallel, as described in (2)
above. Avoid crossing even on discrete layers, except for lines carrying signals with low switching frequencies.
(4) After implementing these precautions, check the output clock waveform by running the actual application
program within the product.
Use an oscilloscope to check outputs from the FOUT1 and FOUT3 pins.
You can check the quality of the OSC3 output waveform via the FOUT3 output. Confirm that the frequency
is as designed, is free of noise, and has minimal jitter.
You can check the quality of the OSC1 waveform via the FOUT1 output. In particular, enlarge the areas
before and after the clock rising and falling edges and take special care to confirm that the regions approxi-
mately 100 ns to either side are free of clock or spiking noise.
Failure to observe precautions (1) to (3) adequately may lead to jitter in the OSC3 output and noise in the
OSC1 output. Jitter in the OSC3 output will reduce operating frequencies, while noise in the OSC1 output
will destabilize timers operated by the OSC1 clock as well as CPU core operations when the system clock
switches to OSC1.
Reset circuit
• The reset signal input to the #RESET pin when power is turned on will vary, depending on various factors,
such as power supply start-up time, components used, and circuit board patterns. Constants such as capaci-
tance and resistance should be determined through thorough testing with real-world products. Account for
resistance fluctuations when setting the #RESET pin pull-up resistance for constants settings.
• Components such as capacitors and resistors connected to the #RESET pin should have the shortest connec-
tions possible to prevent noise-induced resets.
APPENDIX C MOUNTING PRECAUTIONS
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 335
Power supply
Sudden noise-induced power supply fluctuations will cause malfunctions. Consider the following precautions
to avoid such malfunctions.
(1) Form connections from the power supply to LVDD, HVDD, and the VSS pin with the shortest, thickest pat-
terns possible.
(2) If a bypass capacitor is connected between LVDD/HVDD and VSS, the connection between the LVDD/HVDD
pins and the VSS pin should be as short as possible.
Signal line location
• To prevent electromagnetically-induced noise caused by mutual inductance, avoid locating large-current sig-
nal lines near circuits susceptible to noise (e.g., clock inputs).
• Locating signal lines in parallel over significant distances or crossing high-speed signal lines will result in
mutual interference, noise, and malfunctions.
In particular, avoid positioning high-speed signal lines close to circuits susceptible to noise (e.g., clock input components).
Noise-induced malfunctions
Check the following three points if you suspect the presence of noise-induced IC malfunctions.
(1) DSIO pin
Low-level noise to this pin will cause a switch to Debug mode. The switch to Debug mode can be con-
firmed by the clock output from DCLK and a High signal from the DST2 pin.
For the product version, we recommend connecting the DSIO pin directly to HVDD or pulling up the DISO
pin using a resistor not exceeding 10 kΩ.
The IC includes an internal pull-up resistor. The resistor has a relatively high impedance of 50 kΩ to 100
kΩ and is not noise-resistant.
(2) #RESET pin
Low-level noise to this pin will reset the IC. Depending on the input waveform, the reset may not proceed
correctly.
This is more likely to occur if, due to circuit design choices, the impedance is high when the reset input is High.
(3) LVDD, HVDD, VSS power supply
The IC will malfunction the instant noise falling below the rated voltage is input.
Incorporate countermeasures on the circuit board, including close patterns for circuit board power supply cir-
cuits, noise-filtering decoupling capacitors, and surge/noise prevention components on the power supply line.
Perform the inspections described above using an oscilloscope capable of observing waveforms of at least 200
MHz. It may not be possible to observe high-speed noise events with a low-speed oscilloscope.
If you detect potential noise-induced malfunctions while observing the waveform with an oscilloscope, recheck
with a low-impedance (less than 1 kΩ) resistor connecting the relevant pin to GND or to the power supply.
Malfunctions at that pin are likely if changes are visible, such as the malfunction disappearing, becoming less
frequent, or the phenomena changing.
The DSIO and #RESET input circuits described above detect input signal edges and are susceptible to malfunc-
tions induced by spike noise. This makes these digital signal pins the most susceptible to noise.
To reduce potential noise, keep the following two points in mind when designing circuit boards:
(A) It is important to use low impedance resistors when driving the signals, as described above. Avoid con-
necting impedance exceeding 1 kΩ (ideally, 0 Ω) to the power supply or GND. The signal lines connected
should be no longer than approximately 5 mm.
(B) Signals switching from 1 to 0 or 0 to 1 may generate noise if signal lines run parallel to other digital lines
on the circuit board.
The highest risk of noise occurs in configurations in which a line is sandwiched between multiple signal
lines that vary in synchrony. You can minimize noise effects by reducing the length of parallel sections (limit
to a few cm) or by increasing the separation (to at least 2 mm).
APPENDIX C MOUNTING PRECAUTIONS
336 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
Miscellaneous
This product series is manufactured by a 0.25 µm microscopic process.
The design is intended to ensure basic IC reliability meeting EIAJ and MIL standards. Nevertheless, keep in
mind the following precautions when mounting the product.
In addition to physical damage, mounting the product may result in electrical damage caused by voltages ex-
ceeding the absolute maximum rating (2.5 V) with random fluctuations over time:
(1) electromagnetically-induced noise from industrial power supplies used in mounting reflow processes, re-
working after mounting, and individual characteristic evaluation (testing) processes;
(2) electromagnetically-induced noise generated by solder irons during soldering.
In particular, the soldering iron GND (tip potential) must be at the same potential as the IC GND during solder-
ing.
APPENDIX D INITIALIZATION ROUTINE
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 337
AppendixD: InitializationRoutine
This section lists typical vector tables and initialization routines.
boot.s
.org 0x8000
.section .rodata . . . (1)
; ======================================================================
; Vector table
; ======================================================================
; interrupt vector interrupt
; number offset source
.long BOOT ; 0x00 0x00 reset . . . (2)
.long unalign_handler ; 0x01 0x04 unalign
.long nmi_handler ; 0x02 0x08 NMI
.long int03_handler ; 0x03 0x0c -
.long p0_handler ; 0x04 0x10 P0 port
.long p1_handler ; 0x05 0x14 P1 port
.long swt_handler ; 0x06 0x18 SWT
.long ct_handler ; 0x07 0x1c CT
.long t8osc1_handler ; 0x08 0x20 T8OSC1
.long int09_handler ; 0x09 0x24 -
.long int0a_handler ; 0x0a 0x28 -
.long t16e_handler ; 0x0b 0x2c T16E
.long t8f_handler ; 0x0c 0x30 T8F
.long t16_0_handler ; 0x0d 0x34 T16 ch0
.long t16_1_handler ; 0x0e 0x38 T16 ch1
.long t16_2_handler ; 0x0f 0x3c T16 ch2
.long uart_handler ; 0x10 0x40 UART
.long remc_handler ; 0x11 0x44 REMC
.long spi_handler ; 0x12 0x48 SPI
.long i2c_handler ; 0x13 0x4c I2C
.long int14_handler ; 0x14 0x50 -
.long int15_handler ; 0x15 0x54 -
.long int16_handler ; 0x16 0x58 -
.long int17_handler ; 0x17 0x5c -
.long int18_handler ; 0x18 0x60 -
.long int19_handler ; 0x19 0x64 -
.long int1a_handler ; 0x1a 0x68 -
.long int1b_handler ; 0x1b 0x6c -
.long int1c_handler ; 0x1c 0x70 -
.long int1d_handler ; 0x1d 0x74 -
.long int1e_handler ; 0x1e 0x78 -
.long int1f_handler ; 0x1f 0x7c -
; ======================================================================
; Program code
; ======================================================================
.text . . . (3)
.align 1
BOOT:
; ===== Initialize ===========================================
; ----- Stack pointer --------------------
Xld.a %sp, 0x7c0 . . . (4)
; ----- Memory controller ----------------
Xld.a %r1, 0x5320 ; MISC register base address
; ROM
Xld.a %r0, 0x04 ; 1 cycle access
ld.b [%r1], %r0 ; [0x5320] <= 0x04 . . . (5)
APPENDIX D INITIALIZATION ROUTINE
338 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
; ----- ITC (interrupt controller) ------
Xld.a %r7, 0x4300 ; ITC register base address
Xld.a %r0, 0x1010 ; P0, P1 interrupt level & trigger mode
ext 0x06
ld [%r7], %r0 ; [0x4306] <= 0x1010 . . . (6)
Xld.a %r0, 0x1010 ; SWT, CT interrupt level & trigger mode
ext 0x08
ld [%r7], %r0 ; [0x4308] <= 0x1010 . . . (6)
Xld.a %r0, 0x0010 ; T8OSC1 interrupt level & trigger mode
ext 0x0a
ld [%r7], %r0 ; [0x430a] <= 0x0010 . . . (6)
Xld.a %r0, 0x1000 ; T16E interrupt level & trigger mode
ext 0x0c
ld [%r7], %r0 ; [0x430c] <= 0x1000 . . . (6)
; ===== Main routine =========================================
...
; ======================================================================
; Interrupt handler
; ======================================================================
; ----- Address unalign --------------------------
unalign_handler:
...
; ----- NMI -------------------------------------
nmi_handler:
...
(1) .rodata section is declared to position vector table in .vector section.
(2) Interrupt processing routine address is defined as vector.
IntXX_handler can be used as software interrupt.
(3) Program code is written in .text section.
(4) Sets stack pointer.
(5) Sets ROM read access cycles.
(See “3 Memory Map and Bus Control.”)
(6) Sets interrupt trigger mode to level trigger for the following peripheral circuits.
P0 port, P1 port, stopwatch timer, clock timer, 8-bit OSC1 timer, PWM & capture timer
(See “6 Interrupt Controller (ITC).”)
APPENDIX E S1C17001 MASK ROM CODE DEVELOPMENT
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 339
AppendixE:S1C17001MaskROM
CodeDevelopment
(1) The S1C17001 mask ROM code was developed using the S1C17704 Flash microprocessor.
(2) ROM data is provided to Epson in “file.PAn” (winmdc output) format. Final user verification of ROM data
should use “file.psa” (sconv32 output) format.
(3) Set the following arguments when executing moto2ff in the S1C17001.
• Data start address = 8,000
• Data block size = 8,000
(4) Use S1C17704 to check operations, confirming that the following functional differences are fully understood:
• The ROM size differs. Remove 32 KB of code in step (3) for final checking using “file.psa” (sconv 32 out-
put).
• The RAM size differs. Note the stack pointer addresses. Confirm that the data in addresses 0x800 to 0xfef
has not changed after checking program operations.
• Do not access LCD driver and SVD related registers that do not exist in the S1C17001.
Table E.1: Comparison of functions between S1C17704 and S1C17001.
Circuit/function S1C17704 S1C17001
Flash 64 Kbytes None
ROM (Mask ROM) None 32 Kbytes
RAM 4 Kbytes 2 Kbytes
Display RAM 572 bytes None
Operating frequency 32kHz to 8.2MHz ←
OSC3 oscillator circuit Crystal/CR ←
OSC1 oscillator circuit Crystal ←
Operation clock input (OSC3) For evaluation use only
Operation clock input (OSC1) For evaluation use only
Input/output port 28 ←
External port interrupt 16 ←
SPI (master/slave) 1ch. ←
I2C (master) 1ch. ←
UART (IrDA1.0 compatible) 1ch. ←
8-bit timer (T8F) 1ch. ←
16-bit timer (T16) 3ch. ←
PWM & capture timer (T16E) 1ch. ←
Clock timer (CT) 1ch. ←
Stopwatch timer (SWT) 1ch. ←
Watchdog timer (WDT) 1ch. ←
8-bit OSC1 timer (T8OSC1) 1ch. ←
LCD driver None
Power supply voltage detection (SVD)
circuit
None
Power supply voltage 1.8V to 3.6V Core voltage (LVDD): 1.65 to 2.7V
I/O voltage (HVDD): 1.65 to 3.6V
APPENDIX F REVISION HISTORY
340 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
AppendixF:RevisionHistory
Rev. No. Date Page Section Details
0.8 2007.9.21 1-3 1.3.1 Pinout Diagram Figure 1.3.1.1 changed
1-4 1.3.2 Pin Descriptions Table 1.3.2.1 changed
23-1 23 Basic External Connection Diagram Figure changed and added
AP-31 Appendix D: Initialization Routine Sample program changed
0.9 2007.10.28 1-2 1-2 Block Diagram Figure 1.2.1 changed
2-1 2.1 S1C17 Core Features Description changed
“It features low power consumption, … are widely used.”
2-3 to 2-5 2.3 Command Set Table 2.3.1 changed
Note (*2) added
2-7 2.4 Vector Table Table 2.4.1 changed
3-1 3 Memory Map and Bus Control Figure 3.1 changed
3-2 3.1 Bus Cycle Description changed
“Interrupt processing stack operation involves reading
… in the last 24 bits.”
3-2
3.1.2 Command Execution Cycle Restrictions
Section changed
3-3 3.2 Internal ROM Area Section title changed
3-4 3.3 Internal RAM Area Section title changed
3-5 3.4 Internal Peripheral Circuit Area Description changed
“The 1 Kbyte area starting at address 0x4000 … and
control registers.”
5-3 5.2 Initial Reset Sequence Description changed
“CPU startup waits for … OSC3 clock frequency”
6-1 6.1 ITC Configuration Figure 6.1.1 changed
6-2 6.2 Vector Table Table 6.2.1 changed
6-3 6.3.2 Interrupt Request from Peripheral
Module and Interrupt Flag
Table 6.3.2.1 changed
6-8 6.3.6 S1C17 Core Interrupt Processing Description added
“- ITEN … has been set to 1.”
6-11 6.6 HALT and SLEEP Mode Cancellation by
Interrupt Factors
Section title changed
Description changed
“HALT and SLEEP modes are … in Appendix B.”
6-13 6.7 Control Register Details Table 6.7.2 changed
6-15 Table 6.7.4 changed
7-1 7.1 OSC Module Configuration Figure 7.1.1 changed
8-1 8.1 Clock Generator Configuration Figure 8.1.1 changed
10-1 10.1 Input/Output Port Configuration Description (note) changed
“Switch on the … using this function.”
10-2 10.2 Input/Output Port Pin Function Selec-
tion (Port MUX)
Description changed
“Resetting the … in Table 10.2.1).”
10-3 10.3 Data Input/Output Description changed
“The input/output ports … PxIO[7:0] (Px_IO register).”
10-4 10.4 Pull-up Control Description changed
“The input/output port contains a pull-up resistor, … (Px_
PU register).”
10-7 10.7 Port Input Interrupt Description changed
“The interrupt controller … Interrupt Controller (ITC).”
10-24 10.9 Precautions Description added
Pull-up
“- Input/output ports that are not used … enabled.”
11-3 11.2.2 External Clock Mode Description changed
“For instructions on controlling chattering filter circuits,
… Function.”
11-8 11.6 16-bit Timer RUN/STOP Control Description changed (one location only)
ITC → interrupt controller (ITC)
11-10 11.8 16-bit Timer Interrupts Description changed (one location only)
ITC → interrupt controller (ITC)
12-2 12.2 8-bit Timer Count Mode Description added
“Note: Make sure … count mode settings.”
12-6 12.6 8-bit Timer RUN/STOP Control Description changed (one location only)
ITC → interrupt controller (ITC)
12-9 12.9 8-bit Timer Interrupts Description changed (one location only)
ITC → interrupt controller (ITC)
12-15 12.10 Control Register Details Description added (0x4206, D4)
“Note: Make sure … count mode settings.”
13-4 13.4 Compare Data Settings Counter reset cycle calculation equation added
13-5 13.5 PWM & Capture Timer RUN/STOP
Control
Description changed (one location only)
ITC → interrupt controller (ITC)
APPENDIX F REVISION HISTORY
S1C17001 TECHNICAL MANUAL Seiko Epson Corporation 341
Rev. No. Date Page Section Details
0.9 2007.10.28 13-8 13.6 Clock Output Control Description changed
“If the counter data register … A bit 0 (T16ECA0) value.”
------
“Precautions
(1) Compare data … (High when INVOUT = 1).”
13-9 13.7 PWM & Capture Timer Interrupts Description changed (one location only)
ITC → interrupt controller (ITC)
13-20 13.9 Precautions Description changed
“- Setting compare data with A > B … (High when
INVOUT = 1).”
14-2 14.2 8-bit OSC1 Timer Count Mode Description added
“Note: Make sure… count mode settings.”
14-5 14.5 Compare Data Settings Compare match cycle calculation equation added
14-6 14.6 8-bit OSC1 Timer RUN/STOP Control Description changed (one location only)
ITC → interrupt controller (ITC)
14-7 14.7 8-bit OSC1 Timer Interrupts Description changed (one location only)
ITC → interrupt controller (ITC)
14-10 14.8 Control Register Details Description added (0x50c0, D1)
“Note: Set the count mode … stopped.”
15-4 15.4 Clock Timer RUN/STOP Control Description changed (one location only)
ITC → interrupt controller (ITC)
15-5 15.5 Clock Timer Interrupts Description changed (one location only)
ITC → interrupt controller (ITC)
16-5 16.5 Stopwatch Timer RUN/STOP Control Description changed (one location only)
ITC → interrupt controller (ITC)
16-6 16.6 Stopwatch Timer Interrupts Description changed (one location only)
ITC → interrupt controller (ITC)
18-9 18.7 UART Interrupts Description changed (one location only)
ITC → interrupt controller (ITC)
19-8 19.6 SPI Interrupts Description changed (one location only)
ITC → interrupt controller (ITC)
20-1, 20-11,
20-18 to 20-
19
20 I2CInterrupt name changed
Receive interrupt à Receive buffer full interrupt
Transmit interrupt à Transmit buffer empty interrupt
20-11 20.6 I2C Interrupts Description changed (one location only)
ITC → interrupt controller (ITC)
21-3 21.3 Carrier Generation Carrier H/L section length calculation equation added
21-6 21.5 Data Transfer Control Description changed (one location only)
ITC → interrupt controller (ITC)
21-8 21.6 REMC Interrupts Description changed (one location only)
ITC → interrupt controller (ITC)
21-13 21.7 Control Register Details Carrier H section length calculation equation added
21-14 Carrier L section length calculation equation added
22-1 22.1 Resource Requirements and Debug-
ging Tool
ICD name changed
ICD Mini → ICD (S5U1C17001H etc.)
22-2 22.2 Debug Break Operation Status Description added
“The 8-bit OSC1 timer… even if O1DBG is set to 1.”
22-4 22.3 Control Register Details Description added
“The 8-bit OSC1 timer … even if O1DBG is set to 1.”
23-1 to 23-2 23 Basic External Connection Diagram Table changed
24-1 24.2 Recommended Operating Conditions Table changed
24-2 to 24-3 24.5 AC Characteristics Sections 24.5.1 to 24.5.4 and tables added
24-6 to 24-7 Graph (TBD) added
AP-23 Appendix A: I/O Register List Error corrected
0x5340-0x5347 Remote Controller
AP-25 B.1 Clock Control Power Saving Figure B.1.1 changed
AP-26 Description changed
“- Execute slp command
… to startup using ports (described later).”
AP-27 Table B.1.1 and description changed
“Canceling HALT and SLEEP modes … processing
routine.”
1.0 2008.1.30 1-1 1.1 Features TBD section fixed
7-2 7.2 OSC3 Oscillator Circuit Figure 7.2.1 changed
Description added
“A drain resistor (Rd) should … if required.”
7.3 7.3 OSC1 Oscillator Circuit Figure 7.3.1 changed
Description added
“A drain resistor (Rd) should … if required.”
11-3 11.2.2 External Clock Mode (TBD) deleted
APPENDIX F REVISION HISTORY
342 Seiko Epson Corporation S1C17001 TECHNICAL MANUAL
Rev. No. Date Page Section Details
1.0 2008.1.30 11-6 11.4 16-bit Timer Reload Register and Un-
derflow Cycle
TBD section fixed
11-9 11.7 16-bit Timer Output Signal TBD section fixed
12-4 12.4 8-bit Timer Reload Register and Under-
flow Cycle
TBD section fixed
12-8 12.8 Fine Mode (TBD) deleted
12-14 12.10 Control Register Details
0x4206
(TBD) deleted
17-3 17.3.3 Watchdog Timer Resetting (TBD) deleted
17.4 Control Register Details (TBD) deleted
23-1 23 Basic External Connection Diagram Figure and table changed
24-1 to 24-6 24 Electrical Characteristics Characteristics tables changed
Characteristics graph deleted
2008.2.8 1-1 1 Overview Description deleted
“On-chip ICE function ...”
1-1 1.1 Features Description changed
• Main (OSC3) oscillator circuit
• Sub (OSC1) oscillator circuit
• Serial interface
Description added
• Mask ROM code development Flash memory
1-4 1.3.2 Pin Descriptions Table 1.3.2.1 changed
7-2 7.2 OSC3 Oscillator Circuit Figure 7.2.1 changed
Description added
“When used with external clock … input to the OSC3 pin.”
7-4 7.3 OSC1 Oscillator Circuit Figure 7.3.1 changed
Description added
“When used with external clock … input to the OSC1 pin.”
12-4 12.4 8-bit Timer Reload Register and Under-
flow Cycle
(TBD) deleted
18-1 18.1 UART Configuration Description changed
“The UART transfers … 150 to 460,800 bps (115,200
bps in IrDA mode).”
18-21 18.10 Precautions Description changed
“The UART transfer … 460,800 bps (115,200 bps in
IrDA mode).”
24-1 24.2 Recommended Operating Conditions Table changed (operating frequency added)
24-3 24.4 Consumption Current Description changed
“*1: Current consumption … and memory writing 10.5%.”
24-5 24.5.3 External Clock Input AC Characteristics Table changed (UART transfer rate)
AP-31 Appendix D: Initialization Routine Sample code comment deleted
(under 3.3 MHZ system clock)
AP-32 Description deleted
(System clock is 3.3 MHz ...)
AP-33 Appendix E: S1C17001 Mask ROM Code
Development
Section added
REVISION HISTORY
Revision History
Code No. Page Contents
411412301 4, 5, 6 Descriptions added.
Package, Pin Descriptions
11 Descriptions modified.
Branch ipa.d→jpa.d
63, 64 Figure 7.6.2 , Figure 7.6.3 modified.
218 Descriptions modified.
(2) RDRY = 1, RD2B = 0...cannot be read. The contents of the receive data buffer must be read out
before an overrun error occurs.
219, 231,
233
Descriptions modified.
Setting the RXEN bit to 0 empties the transmission data buffer, clearing any remaining data.
Preventing transfers by writing 0 to RXEN also clears transmit data buffer.
• Preventing transfer by setting RXEN to 0 clears (initializes) transfer data buffers. Before writing 0 to
RXEN, confirm the absence of data in the buffers awaiting transmission.
220 Descriptions modified.
However, if the receive data buffer is not emptied (by reading out data received) by the time this data
has been received, the third data received...will not be sent to the buffer and generate an overrun error.
226 Descriptions modified.
FER is reset by writing 1....PER is reset by writing 1....OER is reset by writing 1.
237 Descriptions deleted.
Since the internal circuit operates in sync with the PCLK...synchronize the differentiated PCLK clock.
Descriptions modified.
Note: The duty ratio of the clock input via the SPICLK pin must be 50%.
Figure 19.3.2 deleted.
238 Descriptions added.
Note: When the SPI module is used in...during continuous transfer.
Figure 19.4.2 added.
240, 241 Figure 19.5.1, Figure 19.5.2 deleted.
Figure 19.5.1 added.
241 Descriptions modified.
After a data transfer is completed (both transmission and reception)...be guaranteed if SPEN is set to 0
while data is being sent or received.
246 Descriptions added.
Note: Make sure that SPEN is set to 1 before writing data to the...to start data transmission/reception.
255 Descriptions modified.
(1)Register setting procedure... control. Figure 20.5.2 gives the configuration of the address data.
256 Figure 20.5.2 modified.
257 Descriptions modified.
In the 9th clock cycle, 0 or 1 set by ...response time, the correct communication can not be performed.
258 Descriptions modified.
After the stop condition has been generated... and transfer data at that point cannot be guaranteed.
259 Figure 20.5.5 modified.
260 Figure 20.5.7, Figure 20.5.8 modified.
261 Figure 20.5.9 modified.
262 Descriptions modified.
Transmit buffer empty interrupt...the transmit buffer empty interrupt or the receive buffer full interrupt by
the program sequence of the I2C master. There’re not registers to decide which interrupt occurred.
266 Descriptions modified.
To generate a START condition, set the following registers...3. Set STRT (D0/I2C_CTL register) to 1.
303 EXCLx input High pulse width 1/fSYS→2/fSYS
EXCLx input Low pulse width 1/fSYS→2/fSYS
AMERICA
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Phone: +1-800-228-3964 Fax: +1-408-922-0238
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Phone: +65-6586-5500 Fax: +65-6271-3182
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KOREA OFFICE
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Phone: +82-2-784-6027 Fax: +82-2-767-3677
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MICRODEVICES OPERATIONS DIVISION
Device Sales & Marketing Dept.
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Phone: +81-42-587-5814 Fax: +81-42-587-5117
International Sales Operations
Document Code: 411412303
First Issue April 2008
Revised March 2011 H
