This is information on a product in full production.
August 2012 Doc ID 8673 Rev. 3 1/239
1
ST10F280
16-bit MCU with MAC unit,
512 Kbyte Flash memory and 18 Kbyte RAM
Datasheet − production data
Features
■High performance cpu with dsp functions
– 16-bit CPU with 4-stage pipeline.
– 50ns Instruction cycle time at 40MHz CPU
clock
– Multiply/accumulate unit (MAC) 16 x 16-bit
multiplication, 40-bit accumulator
– Repeat unit
– Enhanced boolean bit manipulation
facilities
– Additional instructions to support hll and
operating systems
– Single-cycle context switching support
■Memory organization
– 512KB on-chip Flash memory single
voltage with erase/program controller
– 100K erasing/programming cycles
– 20 year data retention time
– Up to 16MB linear address space for code
and data (5MB with CAN)
– 2KB on-chip internal ram (IRAM)
– 16KB extension RAM (XRAM)
■Fast and flexible bus
– Programmable external bus characteristics
for different address ranges
– 8-bit or 16-bit external data bus
– Multiplexed or demultiplexed external
address/data buses
– Five programmable chip-select signals
– Hold-acknowledge bus arbitration support
■Interrupt
– 8-channel peripheral event controller for
single cycle, interrupt driven data transfer
– 16-priority-level interrupt system with 56
sources, sample-rate down to 25ns
■Two multi-functional general purpose timer
units with 5 timers
■Two 16-channel capture/compare units
■A/D converter
– 2X16-channel 10-bit
–4.85μs conversion time
– One timer for adc channel injection
■8-channel PWM unit
■Serial channels
– Synchronous/async serial channel
– High-speed synchronous channel
■Fail-safe protection
– Programmable watchdog timer
– Oscillator watchdog
■Two CAN 2.0b interfaces operating on one or
two can busses (30 or 2x15 message objects)
■On-chip bootstrap loader
■Clock generation
–On-chip PLL
– Direct or prescaled clock input
■Up to 143 general purpose i/o lines
– Individually programmable as input, output
or special function
– Programmable threshold (hysteresis)
■Idle and power down modes
■Maximum cpu frequency 40MHz
■Package PBGA 208 balls (23 x 23 x 1.96 mm -
pitch 1.27 mm)
■Single voltage supply: 5 V ±10% (embedded
regulator for 3.3 V core supply)
■Temperature range: -40°C to 125°C
PBGA208 (23 x 23 x 1.96 - Pitch 1.27 mm)
(Plastic Bold Grid Array)
ORDER CODE: ST10F280-JT3
www.st.com
Contents ST10F280
2/239 Doc ID 8673 Rev. 3
Contents
1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2 Ball data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4 Memory organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.1 Visibility of XBUS peripherals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5 Internal Flash memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.2 Operational overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.2.1 Read mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.2.2 Instructions and commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.2.3 Status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.2.4 Erase operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.2.5 Erase suspend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.2.6 In-system programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.2.7 Read/write protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.2.8 Power supply, reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.3 Architectural description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.3.1 Read mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.3.2 Command mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.3.3 Flash Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5.3.4 Flash Protection Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.3.5 Instructions description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.3.6 Reset processing and initial State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.4 Flash memory configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.5 Application examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.5.1 Handling of Flash addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.5.2 Basic Flash access control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
5.5.3 Programming examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5.6 Bootstrap loader . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
5.6.1 Entering the bootstrap loader . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
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5.6.2 Memory configuration after reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
5.6.3 Loading the startup code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
5.6.4 Exiting bootstrap loader mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
5.6.5 Choosing the baud rate for the BSL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
6 Central Processing Unit (CPU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
6.1 Multiplier-accumulator Unit (MAC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
6.1.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
6.2 Instruction set summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
6.3 MAC coprocessor specific instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
7 External bus controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
7.1 Programmable chip select timing control . . . . . . . . . . . . . . . . . . . . . . . . . 63
7.2 READY programmable polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
8 Interrupt system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
8.1 External interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
8.2 Interrupt registers and vectors location list . . . . . . . . . . . . . . . . . . . . . . . . 68
8.3 Interrupt Control Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
8.4 Exception and error traps list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
9 Capture/Compare (CAPCOM) units . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
10 General purpose timer unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
10.1 GPT1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
10.2 GPT2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
11 PWM module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
11.1 Standard PWM module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
11.2 New PWM module: XPWM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
11.2.1 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
11.2.2 XPWM module registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
11.2.3 XPWM Control Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
11.2.4 Interrupt request generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
11.2.5 XPWM output signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
11.2.6 XPOLAR Register (polarity of the XPWM channel) . . . . . . . . . . . . . . . . 92
Contents ST10F280
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12 Parallel ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
12.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
12.1.1 Open drain mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
12.1.2 Input threshold control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
12.1.3 Output driver control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
12.1.4 Alternate port functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
12.2 Port 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
12.2.1 Alternate functions of Port 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
12.3 Port 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
12.3.1 Alternate functions of Port 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
12.4 Port 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
12.4.1 Alternate functions of Port 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
12.5 Port 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
12.5.1 Alternate functions of Port 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
12.6 Port 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
12.6.1 Alternate functions of Port 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
12.7 Port 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
12.7.1 Alternate functions of Port 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
12.8 Port 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
12.8.1 Alternate functions of Port 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
12.9 Port 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
12.9.1 Alternate functions of Port 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
12.10 Port 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
12.10.1 Alternate functions of Port 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
12.11 XPort 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
12.12 XPort 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
12.12.1 Alternate functions of XPort 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
12.12.2 New disturb protection on analog inputs . . . . . . . . . . . . . . . . . . . . . . . 139
13 A/D converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
13.1 A/D converter module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
13.2 Multiplexage of two blocks of 16 analog Inputs . . . . . . . . . . . . . . . . . . . 140
13.3 XTIMER peripheral (trigger for ADC channel injection) . . . . . . . . . . . . . 141
13.3.1 Main features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
13.3.2 Register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
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13.3.3 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
14 Serial channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
14.1 Asynchronous / Synchronous Serial Interface (ASCO) . . . . . . . . . . . . . 148
14.1.1 ASCO in asynchronous mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
14.1.2 ASCO in synchronous mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
14.2 High speed synchronous serial channel (SSC) . . . . . . . . . . . . . . . . . . . 152
14.2.1 Baud rate generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
15 CAN modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
15.1 Memory mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
15.1.1 CAN1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
15.1.2 CAN2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
15.2 CAN bus configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
15.2.1 Single CAN bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
15.2.2 Multiple CAN bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
15.3 Register and message object organization . . . . . . . . . . . . . . . . . . . . . . 157
15.4 CAN interrupt handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
15.4.1 Bit timing configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
15.4.2 Mask registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
15.5 The message object . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
15.6 Arbitration Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
16 Watchdog timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
17 System reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
17.1 Asynchronous reset (long hardware reset) . . . . . . . . . . . . . . . . . . . . . . 171
17.1.1 Power-on reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
17.1.2 Hardware reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
17.1.3 Exit of asynchronous reset state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
17.2 Synchronous reset (warm reset) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
17.2.1 Exit of synchronous reset state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
17.3 Software reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
17.4 Watchdog timer reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
17.5 RSTOUT pin and bidirectional reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
17.6 Reset circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
Contents ST10F280
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18 Power reduction modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
18.1 Idle mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
18.2 Power down mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
18.2.1 Protected power down mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
18.2.2 Interruptable power down mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
19 Special function register overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
19.1 Identification registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
19.2 System configuration registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
20 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
20.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
20.2 Parameter interpretation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
20.3 DC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
20.3.1 A/D converter characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
20.3.2 Conversion timing control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
20.4 AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
20.4.1 Test waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
20.4.2 Definition of internal timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
20.4.3 Clock generation modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211
20.4.4 Prescaler operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212
20.4.5 Direct drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212
20.4.6 Oscillator Watchdog (OWD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
20.4.7 Phase locked loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
20.4.8 External clock drive XTAL1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214
20.4.9 Memory cycle variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215
20.4.10 Multiplexed bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215
20.4.11 Demultiplexed bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222
20.4.12 CLKOUT and READY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227
20.4.13 External bus arbitration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229
20.4.14 High-speed synchronous serial interface (SSC) timing . . . . . . . . . . . . 231
21 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235
21.1 ECOPACK® . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235
21.2 PBGA 208 (23 x 23 x 1.96 mm) mechanical data . . . . . . . . . . . . . . . . . 235
List of tables ST10F280
8/239 Doc ID 8673 Rev. 3
List of tables
Table 1. Ball description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 2. 512 Kbyte Flash memory block organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Table 3. Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Table 4. Instruction set summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Table 5. MAC coprocessor specific instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Table 6. Pointer post-modification combinations for IDXi and Rwn . . . . . . . . . . . . . . . . . . . . . . . . . 60
Table 7. MAC registers referenced as ‘CoReg‘ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Table 8. Interrupt sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Table 9. Exceptions or error conditions that can arise during run-time. . . . . . . . . . . . . . . . . . . . . . . 74
Table 10. Compare modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Table 11. CAPCOM timer input frequencies, resolution and periods . . . . . . . . . . . . . . . . . . . . . . . . . 77
Table 12. GPT1 timer input frequencies, resolution and periods . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Table 13. GPT2 timer input frequencies, resolution and period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Table 14. PWM unit frequencies and resolution at 40MHz CPU clock . . . . . . . . . . . . . . . . . . . . . . . . 81
Table 15. XPWM module channel specific register addresses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Table 16. XPWM frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Table 17. POCON registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Table 18. Port 2 alternate function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Table 19. Port 3 alternate functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Table 20. Port 4 alternate functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Table 21. Port 5 alternate functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Table 22. Port 6 alternate functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Table 23. Port 7 alternate functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Table 24. Port 8 alternate functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Table 25. XPort 10 alternate functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
Table 26. The different counting Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Table 27. Timer registers mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
Table 28. Commonly used baud rates by reload value and deviation errors . . . . . . . . . . . . . . . . . . 150
Table 29. Commonly used baud rates by reload value and deviation errors . . . . . . . . . . . . . . . . . . 152
Table 30. Synchronous baud rate and reload values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
Table 31. INTID values and corresponding interrupt sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
Table 32. Functions of complementary bit of message control register . . . . . . . . . . . . . . . . . . . . . . 166
Table 33. WDTCON bits value on different resets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
Table 34. WDTREL reload value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
Table 35. Reset event definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
Table 36. PORT0 latched configuration for the different resets . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
Table 37. PORT0 bit latched into the different registers after reset . . . . . . . . . . . . . . . . . . . . . . . . . 179
Table 38. Special function registers listed by name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
Table 39. X registers listed by name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192
Table 40. Stack size selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
Table 41. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
Table 42. DC characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
Table 43. A/D converter characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
Table 44. ADC sampling and conversion timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
Table 45. CPU frequency generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211
Table 46. External clock drive XTAL1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214
Table 47. Memory cycle variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215
Table 48. Multiplexed bus characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215
ST10F280 List of tables
Doc ID 8673 Rev. 3 9/239
Table 49. Demultiplexed bus characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222
Table 50. CLKOUT and READY characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227
Table 51. External bus arbitration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229
Table 52. SSC master timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231
Table 53. SSC slave timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233
Table 54. PBGA 208 (23 x 23 x 1.96 mm) mechanical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236
Table 55. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237
Table 56. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238
List of figures ST10F280
10/239 Doc ID 8673 Rev. 3
List of figures
Figure 1. Logic symbol. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 2. Ball Configuration (bottom view). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 3. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 4. ST10F280 on-chip memory mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 5. Bootstrap loader sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Figure 6. Hardware provisions to activate the BSL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Figure 7. Memory configuration after reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Figure 8. Baud rate deviation between host and ST10F280 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Figure 9. CPU block diagram (MAC unit not included) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Figure 10. MAC unit architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Figure 11. Chip select delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Figure 12. CAPCOM unit block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Figure 13. Block diagram of CAPCOM timers T0 and T7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Figure 14. Block diagram of CAPCOM timers T1 and T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Figure 15. Block diagram of GPT1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Figure 16. Block diagram of GPT2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Figure 17. Block diagram of PWM module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Figure 18. SFRs and port pins associated with the XPWM module. . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Figure 19. XPWM channel block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Figure 20. Operation and output waveform in mode 0. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Figure 21. Operation and output waveform in mode 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Figure 22. Operation and output waveform in burst mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Figure 23. Operation and output waveform in single shot mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Figure 24. XPWM output signal generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Figure 25. SFRs associated with the parallel ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Figure 26. XBUS registers associated with the parallel ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Figure 27. Output drivers in push/pull mode and in open drain mode . . . . . . . . . . . . . . . . . . . . . . . . . 95
Figure 28. Hysteresis for special input thresholds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Figure 29. Port 0 I/O and alternate functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Figure 30. Block diagram of a Port 0 pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Figure 31. Port 1 I/O and alternate functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Figure 32. Block diagram of a Port 1 pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Figure 33. Port 2 I/O and alternate functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Figure 34. Block diagram of a Port 2 pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Figure 35. Port 3 I/O and alternate functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Figure 36. Block diagram of Port 3 pin with alternate input or alternate output function . . . . . . . . . . 114
Figure 37. Block diagram of pins P3.15 (CLKOUT) and P3.12 (BHE/WRH) . . . . . . . . . . . . . . . . . . . 115
Figure 38. Port 4 I/O and alternate functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Figure 39. Block diagram of a Port 4 pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Figure 40. Block diagram of P4.4 and P4.5 pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Figure 41. Block diagram of P4.6 and P4.7 pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Figure 42. Port 5 I/O and alternate functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Figure 43. Block diagram of a Port 5 pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Figure 44. Port 6 I/O and alternate functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Figure 45. Block diagram of Port 6 pins with an alternate output function . . . . . . . . . . . . . . . . . . . . . 126
Figure 46. Port 7 I/O and alternate functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Figure 47. Block diagram of Port 7 pins P7.3...P7.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Figure 48. Block diagram of Port 7 pins P7.7...P7.4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
ST10F280 List of figures
Doc ID 8673 Rev. 3 11/239
Figure 49. Port 8 I/O and alternate functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Figure 50. Block diagram of Port 8 pins P8.7...P8.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Figure 51. PORT10 I/O and alternate functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Figure 52. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Figure 53. XTIMER block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
Figure 54. XADCINJ timer output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Figure 55. External connection for ADC channel injection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
Figure 56. Asynchronous mode of serial channel ASC0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Figure 57. Synchronous mode of serial channel ASC0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Figure 58. Synchronous serial channel SSC block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
Figure 59. Single CAN bus multiple interfaces - multiple transceivers. . . . . . . . . . . . . . . . . . . . . . . 156
Figure 60. Single CAN bus dual interfaces - single transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
Figure 61. Connection to two different CAN buses (e.g. for gateway application). . . . . . . . . . . . . . . 157
Figure 62. CAN module address map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Figure 63. Bit timing definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
Figure 64. Message object address map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
Figure 65. Asynchronous reset timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
Figure 66. Synchronous warm reset (short low pulse on RSTIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
Figure 67. Synchronous warm reset (long low pulse on RSTIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
Figure 68. Internal (simplified) reset circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
Figure 69. Minimum external reset circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
Figure 70. External reset hardware circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
Figure 71. External RC circuit on RPD pin for exiting power down mode with external interrupt . . . 183
Figure 72. Simplified power down exit circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
Figure 73. Power down exit sequence when using an external interrupt (PLL x 2) . . . . . . . . . . . . . . 184
Figure 74. Supply / idle current as a function of operating frequency . . . . . . . . . . . . . . . . . . . . . . . . 207
Figure 75. Input / output waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
Figure 76. Float waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
Figure 77. Generation mechanisms for the CPU clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211
Figure 78. Approximated maximum PLL Jitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214
Figure 79. External clock drive XTAL1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215
Figure 80. External memory cycle: multiplexed bus, with / without read / write delay, normal ALE. . 218
Figure 81. External memory cycle: multiplexed bus, with / without read / write delay, extended ALE219
Figure 82. External memory cycle: multiplexed bus, with / without read / write delay, normal ALE,
read / write chip select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220
Figure 83. External memory cycle: multiplexed bus, with / without read / write delay, extended ALE,
read / write chip select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221
Figure 84. External memory cycle: demultiplexed bus, with / without read / write delay, normal ALE224
Figure 85. External memory cycle: demultiplexed bus, with / without read / write delay, extended ALE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225
Figure 86. External memory cycle: demultiplexed bus, with / without read / write delay, normal ALE,
read / write chip select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226
Figure 87. External memory cycle: demultiplexed bus, no read / write delay, extended ALE, read /write
chip select. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227
Figure 88. CLKOUT and READY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229
Figure 89. External bus arbitration, releasing the bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230
Figure 90. External bus arbitration, (regaining the bus) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231
Figure 91. SSC master timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232
Figure 92. SSC slave timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234
Figure 93. Package outline PBGA 208 (23 x 23 x 1.96 mm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235
Description ST10F280
12/239 Doc ID 8673 Rev. 3
1 Description
The ST10F280 is a new derivative of the STMicroelectronics® ST10 family of 16-bit single-
chip CMOS microcontrollers. It combines high CPU performance (up to 20 million
instructions per second) with high peripheral functionality and enhanced I/O-capabilities. It
also provides on-chip high-speed single voltage FLASH memory, on-chip high-speed RAM,
and clock generation via PLL.
ST10F280 is processed in 0.35μm CMOS technology. The MCU core and the logic is
supplied with a 5V to 3.3V on chip voltage regulator. The part is supplied with a single 5V
supply and I/Os work at 5V.
The device is upward compatible with the ST10F269 device, with the following set of
differences:
●Two supply pins (DC1,DC2) on the PBGA-208 package are used for decoupling the
internally generated 3.3V core logic supply. Do not connect these two pins to 5.0V
external supply. Instead, these pins should be connected to a decoupling capacitor
(ceramic type, value ≥330nF).
●The A/D Converter characteristics stay identical but 16 new input channel are added. A
bit in a new register (XADCMUX) control the multiplexage between the first block of 16
channel (on Port5) and the second block (on XPort10). The conversion result registers
stay identical and the software management can determine the block in use. A new
dedicated timer controls now the ADC channel injection mode on the input CC31
(P7.7). The output of this timer is visible on a dedicated pin (XADCINJ) to emulate this
new functionality.
●A second XPWM peripheral (4 new channels) is added. Four dedicated pins are
reserved for the outputs (XPWM[0:3])
●A new general purpose I/O port named XPORT9 (16 bits) is added. Due to the bit
addressing management, it will be different from other standard general purpose I/O
ports.
ST10F280 Description
Doc ID 8673 Rev. 3 13/239
Figure 1. Logic symbol
84!,
234).
84!,
234/54
.-)
%!
2%!$9
!,%
2$
7272,
0ORT
BIT
0O RT
BIT
0O RT
BIT
0O RT
BIT
0O RT
BIT
0O RT
BIT
0O RT
BIT
6
$$
6
33
0O RT
BIT
0ORT
BIT
6
!2%&
6
!'.$
80ORT
BIT
807-
BIT
8!$#).*
80ORT
BIT
$# $#
$ECOUPLINGCAPACITORFORINTERNALREGULATOR
34&
("1($'5
Ball data ST10F280
14/239 Doc ID 8673 Rev. 3
2 Ball data
The ST10F280 package is a PBGA of 23 x 23 x 1.96 mm. The pitch of the balls is 1.27 mm.
The signal assignment of the 208 balls is described in Figure 2 for the configuration and in
Ta bl e 1 for the ball signal assignment. This package has 25 additional thermal balls.
Figure 2. Ball Configuration (bottom view)
K7
VSS
K8
VSS
K9
VSS
J7
VSS
J8
VSS
J9
VSS
H7
VSS
H8
VSS
H9
VSS
G7
VSS
G8
VSS
G9
VSS
K10
VSS
K11
VSS
J10
VSS
J11
VSS
H10
VSS
H11
VSS
G10
VSS
G11
VSS
VSS VSS VSS VSS VSS
U1 U2
VAREF
U3
VAGND
U4 U5 U6 U7 U8 U9 U10
VSS
U11
DC2
U12 U13 U14 U15 U16
T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T11 T12 T13 T14 T15 T16
R1 R2 R3 R4 R14 R15 R16
M1 M2 M3 M15 M16 M17
L1
VSS
L2 L3 L15 L16 L17
VDD
K1
VDD
K2 K3 K15 K16 K17
VSS
J1 J2 J3 J15 J16 J17
H1 H2 H3 H15 H16 H17
G1 G2 G3 G15 G16 G17
F1 F2 F3 F15 F16 F17
E1 E2 E3 E15 E16 E17
VSS
D1 D2 D3 D15 D16 D17
C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16
B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B11 B12 B13 B14 B15 B16
A1 A2 A3 A4
RSTIN
A5
XTAL1
A6
XTAL2
A7 A8 A9 A10 A11 A12 A13 A14 A15 A16
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
T
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
T
1716151413121110987654321
1716151413121110987654321
U17
T17
R17
C17
B17
A17
UU
VSS
DC1 VDD
M4
L4
K4
J4
H4
G4
E4
D4
M14
L14
K14
J14
H14
G14
E14
D14
P15 P16 P17
P14
D5 D6 D7 D8 D9 D10 D11 D12 D13
P5 P6 P7 P8 P9 P10 P11 P12 P13
N1 N2 N3 N4
F4 F14
L7 L8 L9 L10 L11
VDD VDD
VSS VDD
VSS VDD
VSS
VDD
VSS
VSS VDD VSS VDD
P3.15
VDD
VSS
RPD
XP10.3 XP10.2 XP10.1 XP10.0
XP10.4XP10.5XP10.6XP10.7
XP10.11 XP10.8 P5.6 P5.10 P5.14XP10.9XP10.10
XP10.13 XP10.12 P5.1 P5.3 P5.7 P5.11 P5.15
XP10.14 P5.0 P5.2 P5.4 P5.8 P5.12
XP10.15 P5.5 P5.9 P5.13
xpwm.0
xpwm.1
xpwm.2
xpwm.3
P6.0
P6.1
P6.2
P6.3
P6.4
P6.5
P6.6
P6.7
P8.0
P8.1P8.2
P8.3P8.4
P8.5P8.6P8.7
P7.0P7.1P7.2P7.3
P7.4 P7.5 P7.6
P7.7 XADCINJ
P2.0
P2.1
P2.2
P2.3 P2.4
P2.5
P2.6
P2.7
P2.8
P2.9
P2.10
P2.11
P2.12
P2.13
P2.14
P2.15
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
P3.7
P3.8 P3.9
P3.10
P3.11 P3.12
P3.13
P4.0
P4.1
P4.2
P4.3
P4.4 P4.5
P4.6 P4.7
RD WR READY ALE
EAP0.0P0.1P0.2
P0.3P0.4P0.5
P0.6
P0.7
P0.8
P0.9
P0.10
P0.11
P0.12
P0.13
P0.14
P0.15
XP9.0
XP9.1
XP9.2
XP9.3
XP9.4
XP9.5
XP9.6
XP9.7
XP9.8
XP9.9
XP9.10
XP9.11
XP9.12
XP9.13
XP9.14
XP9.15
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7P1.8
P1.9
P1.10
P1.11
P1.12
P1.13
P1.14 P1.15
VSS
RSTOUT
NMI
VSS
VSS
VSS
VSS VSS
VSS VSS
VSS
VSS
VSS
VSS
VSS VSS
VSS
VSS
VSS VSS VSS VSS
VSS VSS
R5 R6 R7 R8 R9 R10 R11 R12 R13
N15 N16 N17
N14
P1 P2 P3 P4
ST10F280 Ball data
Doc ID 8673 Rev. 3 15/239
Table 1. Ball description
Symbol Ball
number Type Function
P6.0 – P6.7
I/O
Port 6 is an 8-bit bidirectional I/O port. It is bit-wise programmable
for input or output via direction bits. For a pin configured as input,
the output driver is put into high-impedance state. Port 6 outputs
can be configured as push/pull or open drain drivers.
The following Port 6 pins also serve for alternate functions:
E4 O P6.0 CS0 Chip Select 0 Output
D3 O P6.1 CS1 Chip Select 1 Output
B1 O P6.2 CS2 Chip Select 2 Output
C1 O P6.3 CS3 Chip Select 3 Output
D2 O P6.4 CS4 Chip Select 4 Output
E3 I P6.5 HOLD External Master Hold Request Input
F4 O P6.6 HLDA Hold Acknowledge Output
D1 O P6.7 BREQ Bus Request Output
P8.0 – P8.7
I/O
Port 8 is an 8-bit bidirectional I/O port. It is bit-wise programmable
for input or output via direction bits. For a pin configured as input,
the output driver is put into high-impedance state. Port 8 outputs
can be configured as push/pull or open drain drivers. The input
threshold of Port 8 is selectable (TTL or special).
The following Port 8 pins also serve for alternate functions:
E2 I/O P8.0 CC16IO CAPCOM2: CC16 Capture Input / Compare Output
F3 I/O P8.1 CC17IO CAPCOM2: CC17 Capture Input / Compare Output
F2 I/O P8.2 CC18IO CAPCOM2: CC18 Capture Input / Compare Output
G3 I/O P8.3 CC19IO CAPCOM2: CC19 Capture Input / Compare Output
G2 I/O P8.4 CC20IO CAPCOM2: CC20 Capture Input / Compare Output
H4 I/O P8.5 CC21IO CAPCOM2: CC21 Capture Input / Compare Output
H3 I/O P8.6 CC22IO CAPCOM2: CC22 Capture Input / Compare Output
H2 I/O P8.7 CC23IO CAPCOM2: CC23 Capture Input / Compare Output
Ball data ST10F280
16/239 Doc ID 8673 Rev. 3
P7.0 – P7.7
I/O
Port 7 is an 8-bit bidirectional I/O port. It is bit-wise programmable
for input or output via direction bits. For a pin configured as input,
the output driver is put into high-impedance state. Port 7 outputs
can be configured as push/pull or open drain drivers. The input
threshold of Port 7 is selectable (TTL or special).
The following Port 7 pins also serve for alternate functions:
J4 O P7.0 POUT0 PWM Channel 0 Output
J3 O P7.1 POUT1 PWM Channel 1 Output
J2 O P7.2 POUT2 PWM Channel 2 Output
J1 O P7.3 POUT3 PWM Channel 3 Output
K2 I/O P7.4 CC28IO CAPCOM2: CC28 Capture Input / Compare Output
K3 I/O P7.5 CC29IO CAPCOM2: CC29 Capture Input / Compare Output
K4 I/O P7.6 CC30IO CAPCOM2: CC30 Capture Input / Compare Output
L2 I/O P7.7 CC31IO CAPCOM2: CC31 Capture Input / Compare Output
XP10.0 –
XP10.15
I
XPort 10 is a 16-bit input-only port with Schmitt-Trigger
characteristics.
The pins of XPort10 also serve as the analog input channels (up to
16) for the A/D converter, where XP10.X equals ANx (Analog input
channel x).
M4
M3
M2
M1
N4
N3
N2
N1
P4
P3
P2
P1
R2
R1
T1
U1
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
XP10.0
XP10.1
XP10.2
XP10.3
XP10.4
XP10.5
XP10.6
XP10.7
XP10.8
XP10.9
XP10.10
XP10.11
XP10.12
XP10.13
XP10.14
XP10.15
Table 1. Ball description (continued)
Symbol Ball
number Type Function
ST10F280 Ball data
Doc ID 8673 Rev. 3 17/239
P5.0 – P5.15
I
Port 5 is a 16-bit input-only port with Schmitt-Trigger
characteristics.
The pins of Port 5 also serve as the analog input channels (up to
16) for the A/D converter, where P5.x equals ANx (Analog input
channel x), or they serve as timer inputs:
T2 I P5.0
R3 I P5.1
T3 I P5.2
R4 I P5.3
T4 I P5.4
U4 I P5.5
P5 I P5.6
R5 I P5.7
T5 I P5.8
U5 I P5.9
P6 I P5.10 T6EUD GPT2 Timer T6 External Up / Down Control Input
R6 I P5.11 T5EUD GPT2 Timer T5 External Up / Down Control Input
T6 I P5.12 T6IN GPT2 Timer T6 Count Input
U6 I P5.13 T5IN GPT2 Timer T5 Count Input
P7 I P5.14 T4EUD GPT1 Timer T4 External Up / Down Control Input
R7 I P5.15 T2EUD GPT1 Timer T2 External Up / Down Control Input
Table 1. Ball description (continued)
Symbol Ball
number Type Function
Ball data ST10F280
18/239 Doc ID 8673 Rev. 3
P2.0 – P2.15
I/O
Port 2 is a 16-bit bidirectional I/O port. It is bit-wise programmable
for input or output via direction bits. For a pin configured as input,
the output driver is put into high-impedance state. Port 2 outputs
can be configured as push/pull or open drain drivers. The input
threshold of Port 2 is selectable (TTL or special).
The following Port 2 pins also serve for alternate functions:
T7 I/O P2.0 CC0IO CAPCOM: CC0 Capture Input / Compare Output
P8 I/O P2.1 CC1IO CAPCOM: CC1 Capture Input / Compare Output
R8 I/O P2.2 CC2IO CAPCOM: CC2 Capture Input / Compare Output
T8 I/O P2.3 CC3IO CAPCOM: CC3 Capture Input / Compare Output
T9 I/O P2.4 CC4IO CAPCOM: CC4 Capture Input / Compare Output
P9 I/O P2.5 CC5IO CAPCOM: CC5 Capture Input / Compare Output
R9 I/O P2.6 CC6IO CAPCOM: CC6 Capture Input / Compare Output
U9 I/O P2.7 CC7IO CAPCOM: CC7 Capture Input / Compare Output
T10 I/O
I
P2.8 CC8IO CAPCOM: CC8 Capture Input / Compare Output,
EX0IN Fast External Interrupt 0 Input
R10 I/O
I
P2.9 CC9IO CAPCOM: CC9 Capture Input / Compare Output,
EX1IN Fast External Interrupt 1 Input
P10 I/O
I
P2.10 CC10IO CAPCOM: CC10 Capture Input / Compare Output,
EX2IN Fast External Interrupt 2 Input
T11 I/O
I
P2.11 CC11IO CAPCOM: CC11 Capture Input / Compare Output,
EX3IN Fast External Interrupt 3 Input
R11 I/O
I
P2.12 CC12IO CAPCOM: CC12 Capture Input / Compare Output,
EX4IN Fast External Interrupt 4 Input
U12 I/O
I
P2.13 CC13IO CAPCOM: CC13 Capture Input / Compare Output,
EX5IN Fast External Interrupt 5 Input
P11 I/O
I
P2.14 CC14IO CAPCOM: CC14 Capture Input / Compare Output,
EX6IN Fast External Interrupt 6 Input
T12
I/O
I
I
P2.15 CC15IO CAPCOM: CC15 Capture Input / Compare Output,
EX7IN Fast External Interrupt 7 Input
T7IN CAPCOM2 Timer T7 Count Input
Table 1. Ball description (continued)
Symbol Ball
number Type Function
ST10F280 Ball data
Doc ID 8673 Rev. 3 19/239
P3.0 - P3.13,
P3.15
I/O
Port 3 is a 15-bit (P3.14 is missing) bidirectional I/O port. It is bit-
wise programmable for input or output via direction bits. For a pin
configured as input, the output driver is put into high-impedance
state. Port 3 outputs can be configured as push/pull or open drain
drivers. The input threshold of Port 3 is selectable (TTL or special).
The following Port 3 pins also serve for alternate functions:
R12 I P3.0 T0IN CAPCOM Timer T0 Count Input
T13 O P3.1 T6OUT GPT2 Timer T6 Toggle Latch Output
P12 I P3.2 CAPIN GPT2 Register CAPREL Capture Input
R13 O P3.3 T3OUT GPT1 Timer T3 Toggle Latch Output
T14 I P3.4 T3EUD GPT1 Timer T3 External Up / Down Control Input
P13 I P3.5 T4IN GPT1 Timer T4 Input for Count / Gate / Reload / Capture
R14 I P3.6 T3IN GPT1 Timer T3 Count / Gate Input
P14 I P3.7 T2IN GPT1 Timer T2 Input for Count / Gate / Reload / Capture
R15 I/O P3.8 MRST SSC Master-Receive / Slave-Transmit I/O
R16 I/O P3.9 MTSR SSC Master-Transmit / Slave-Receive O/I
N14 I/O P3.10 TxD0 ASC0 Clock / Data Output (Asynchronous /
Synchronous)
P15 O P3.11 RxD0 ASC0 Data Input (Asynchronous) or I/O
(Synchronous)
P16 O P3.12 BHE External Memory High Byte Enable Signal, WRH
External Memory High Byte Write Strobe
M14 I/O P3.13 SCLK SSC Master Clock Output / Slave Clock Input
T17 O P3.15 CLKOUT System Clock Output (= CPU Clock)
Table 1. Ball description (continued)
Symbol Ball
number Type Function
Ball data ST10F280
20/239 Doc ID 8673 Rev. 3
P4.0 – P4.7
I/O
Port 4 is an 8-bit bidirectional I/O port. It is bit-wise programmable
for input or output via direction bits. For a pin configured as input,
the output driver is put into high-impedance state. The input
threshold is selectable (TTL or special).
P4.6 & P4.7 outputs can be configured as push-pull or open-drain
drivers.
In case of an external bus configuration, Port 4 can be used to
output the segment address lines:
N16 O P4.0 A16 Least Significant Segment Address Line
M15 O P4.1 A17 Segment Address Line
L14 O P4.2 A18 Segment Address Line
M16 O P4.3 A19 Segment Address Line
L15 O
I
P4.4 A20 Segment Address Line
CAN2_RxD CAN2 Receive Data Input
L16 O
I
P4.5 A21 Segment Address Line
CAN1_RxD CAN1 Receive Data Input
K14 O
O
P4.6 A22 Segment Address Line, CAN_TxD
CAN1_TxD CAN1 Transmit Data Output
K15 O
O
P4.7 A23 Most Significant Segment Address Line
CAN2_TxD CAN2 Transmit Data Output
RD J14 O External Memory Read Strobe. RD is activated for every external
instruction or data read access.
WR/WRL J15 O
External Memory Write Strobe. In WR-mode this pin is activated for
every external data write access. In WRL-mode this pin is activated
for low byte data write accesses on a 16-bit bus, and for every data
write access on an 8-bit bus. See WRCFG in register SYSCON for
mode selection.
READY/
READY J16 I
Ready Input. The active level is programmable. When the Ready
function is enabled, the selected inactive level at this pin during an
external memory access will force the insertion of memory cycle
time waitstates until the pin returns to the selected active level.
ALE J17 O
Address Latch Enable Output. Can be used for latching the
address into external memory or an address latch in the
multiplexed bus modes.
EA H17 I
External Access Enable pin. A low level at this pin during and after
Reset forces the ST10F280 to begin instruction execution out of
external memory. A high level forces execution out of the internal
Flash Memory.
Table 1. Ball description (continued)
Symbol Ball
number Type Function
ST10F280 Ball data
Doc ID 8673 Rev. 3 21/239
PORT0:
P0L.0 - P0L.7,
P0H.0 - P0H.7
I/O
PORT0 consists of the two 8-bit bidirectional I/O ports P0L and
P0H. It is bit-wise programmable for input or output via direction
bits. For a pin configured as input, the output driver is put into high-
impedance state.
In case of an external bus configuration, PORT0 serves as the
address (A) and address/data (AD) bus in multiplexed bus modes
and as the data (D) bus in demultiplexed bus modes.
Demultiplexed bus modes:
Data Path Width: 8-bit 16-bit
P0L.0 – P0L.7: D0 - D7 D0 - D7
P0H.0 – P0H.7: I/O D8 - D15
Multiplexed bus modes:
Data Path Width: 8-bit 16-bit
P0L.0 – P0L.7: AD0 - AD7 AD0 - AD7
P0H.0 – P0H.7: A8 - A15 AD8 - AD15
H16 I/O P0L.0
H15 I/O P0L.1
H14 I/O P0L.2
G16 I/O P0L.3
G15 I/O P0L.4
G14 I/O P0L.5
F16 I/O P0L.6
E17 I/O P0L.7
F15 I/O P0H.0
E16 I/O P0H.1
F14 I/O P0H.2
D17 I/O P0H.3
E15 I/O P0H.4
D16 I/O P0H.5
C17 I/O P0H.6
E14 I/O P0H.7
Table 1. Ball description (continued)
Symbol Ball
number Type Function
Ball data ST10F280
22/239 Doc ID 8673 Rev. 3
XPORT9.0 -
XPORT9.15
I/O
XPort 9 is a 16-bit bidirectional I/O port. It is bit-wise programmable
for input or output via direction bits. For a pin configured as input,
the output driver is put into high-impedance state. XPort 9 outputs
can be configured as push/pull or open drain drivers.
D15 I/O XPORT9.0
C16 I/O XPORT9.1
D14 I/O XPORT9.2
C15 I/O XPORT9.3
B16 I/O XPORT9.4
D13 I/O XPORT9.5
C14 I/O XPORT9.6
B15 I/O XPORT9.7
A15 I/O XPORT9.8
B14 I/O XPORT9.9
C13 I/O XPORT9.10
D12 I/O XPORT9.11
B13 I/O XPORT9.12
C12 I/O XPORT9.13
D11 I/O XPORT9.14
B12 I/O XPORT9.15
Table 1. Ball description (continued)
Symbol Ball
number Type Function
ST10F280 Ball data
Doc ID 8673 Rev. 3 23/239
PORT1:
P1L.0 - P1L.7,
P1H.0 - P1H.7
I/O
PORT1 consists of the two 8-bit bidirectional I/O ports P1L and
P1H. It is bit-wise programmable for input or output via direction
bits. For a pin configured as input, the output driver is put into high-
impedance state. PORT1 is used as the 16-bit address bus (A) in
demultiplexed bus modes and also after switching from a
demultiplexed bus mode to a multiplexed bus mode. The following
PORT1 pins also serve for alternate functions:
C11 I/O P1L.0
B11 I/O P1L.1
D10 I/O P1L.2
C10 I/O P1L.3
B10 I/O P1L.4
A10 I/O P1L.5
D9 I/O P1L.6
C9 I/O P1L.7
C8 I/O P1H.0
D8 I/O P1H.1
A7 I/O P1H.2
B7 I/O P1H.3
C7 I P1H.4 CC24IO CAPCOM2: CC24 Capture Input
D7 I P1H.5 CC25IO CAPCOM2: CC25 Capture Input
C5 I P1H.6 CC26IO CAPCOM2: CC26 Capture Input
C6 I P1H.7 CC27IO CAPCOM2: CC27 Capture Input
XTAL1 A5 I XTAL1: Input to the oscillator amplifier and input to the internal
clock generator
XTAL2 A6 O
XTAL2: Output of the oscillator amplifier circuit.
To clock the device from an external source, drive XTAL1, while
leaving XTAL2 unconnected. Minimum and maximum high/low and
rise/fall times specified in the AC Characteristics must be observed.
RSTIN A3 I
Reset Input with Schmitt-Trigger characteristics. A low level at this
pin for a specified duration while the oscillator is running resets the
ST10F280. An internal pull-up resistor permits power-on reset
using only a capacitor connected to VSS.
In bidirectional reset mode (enabled by setting bit BDRSTEN in
SYSCON register), the RSTIN line is pulled low for the duration of
the internal reset sequence.
RSTOUT B4 O
Internal Reset Indication Output. This pin is set to a low level when
the part is executing either a hardware, a software or a watchdog
timer reset. RSTOUT remains low until the EINIT (end of
initialization) instruction is executed.
Table 1. Ball description (continued)
Symbol Ball
number Type Function
Ball data ST10F280
24/239 Doc ID 8673 Rev. 3
NMI C4 I
Non-Maskable Interrupt Input. A high to low transition at this pin
causes the CPU to vector to the NMI trap routine. If bit PWDCFG =
‘0’ in SYSCON register, when the PWRDN (power down)
instruction is executed, the NMI pin must be low in order to force
the ST10F280 to go into power down mode. If NMI is high and
PWDCFG =’0’, when PWRDN is executed, the part will continue to
run in normal mode.
If not used, pin NMI should be pulled high externally.
XPWM.0 D4 O XPWM Channel 0 Output
XPWM.1 C3 O XPWM Channel 1 Output
XPWM.2 B2 O XPWM Channel 2 Output
XPWM.3 C2 O XPWM Channel 3 Output
XADCINJ L3 O Output trigger for ADC channel injection
VAREF U2 - Reference voltage for the A/D converter.
VAGND U3 - Reference ground for the A/D converter.
RPD M17 I/O Timing pin for the return from powerdown circuit and
synchronous/asynchronous reset selection.
DC1 G1 O 3.3V Decoupling pin: a decoupling capacitor of ~330 nF must be
connected between this pin and nearest VSS pin.
DC2 U11 O 3.3V Decoupling pin: a decoupling capacitor of ~330 nF must be
connected between this pin and VSS nearest pin.
VDD
A2
A9
A12
A14
E1
K1
U8
U15
P17
L17
G17
-Digital Supply Voltage: + 5 V during normal operation, idle mode
and power down mode
Table 1. Ball description (continued)
Symbol Ball
number Type Function
ST10F280 Ball data
Doc ID 8673 Rev. 3 25/239
VSS
A1
A4
A8
A11
A13
A16
A17
B3
B5
B6
B8
B9
B17
D5
D6
F1
F17
G4
H1
K16
K17
L1
L4
N15
N17
R17
T15
T16
U7
U10
U13
U14
U16
U17
- Digital ground.
Table 1. Ball description (continued)
Symbol Ball
number Type Function
Functional description ST10F280
26/239 Doc ID 8673 Rev. 3
3 Functional description
The architecture of the ST10F280 combines advantages of both RISC and CISC processors
and an advanced peripheral subsystem. The block diagram gives an overview of the
different on-chip components and the high bandwidth internal bus structure of the
ST10F280.
Figure 3. Block diagram
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ST10F280 Memory organization
Doc ID 8673 Rev. 3 27/239
4 Memory organization
The memory space of the ST10F280 is configured in a unified memory architecture. Code
memory, data memory, registers and I/O ports are organized within the same linear address
space of 16M Bytes. The entire memory space can be accessed byte-wise or word-wise.
Particular portions of the on-chip memory have additionally been made directly bit
addressable.
FLASH: 512K Bytes of on-chip single voltage FLASH memory.
IRAM: 2K Bytes of on-chip internal RAM (dual-port) is provided as a storage for data,
system stack, general purpose register banks and code. The register bank can consist of up
to 16 word-wide (R0 to R15) and/or byte-wide (RL0, RH0, …, RL7, RH7) general purpose
registers. Base address is 00’F600h, upper address is 00’FDFFh.
XRAM: 16K Bytes of on-chip extension RAM (single port XRAM) is provided as a storage
for data, user stack and code. The XRAM is a single bank, connected to the internal XBUS
and are accessed like an external memory in 16-bit demultiplexed bus-mode without
waitstate or read/write delay (50ns access at 40MHz CPU clock). Byte and word access is
allowed.
The XRAM address range is 00’8000h - 00’BFFFh if enabled (XPEN set bit 2 of SYSCON
register-, and XRAMEN set bit 2 of XPERCON register-). If bit XRAMEN or XPEN is
cleared, then any access in the address range 00’8000h 00’BFFFh will be directed to
external memory interface, using the BUSCONx register corresponding to address
matching ADDRSELx register
As the XRAM appears like external memory, it cannot be used for the ST10F280’s system
stack or register banks. The XRAM is not provided for single bit storage and therefore is not
bit addressable.
SFR/ESFR: 1024 bytes (2 * 512 bytes) of address space is reserved for the special function
register areas. SFRs are word-wide registers which are used for controlling and monitoring
functions of the different on-chip units.
CAN1: Address range 00’EF00h 00’EFFFh is reserved for the CAN1 Module access. The
CAN1 is enabled by setting XPEN bit 2 of the SYSCON register and bit 0 of the new
XPERCON register. Accesses to the CAN Module use demultiplexed addresses and a 16-
bit data bus (byte accesses are possible). Two waitstates give an access time of 100 ns at
40MHz CPU clock. No tristate waitstate is used.
CAN2: Address range 00’EE00h 00’EEFFh is reserved for the CAN2 Module access. The
CAN2 is enabled by setting XPEN bit 2 of the SYSCON register and bit 1 of the new
XPERCON register. Accesses to the CAN Module use demultiplexed addresses and a 16-
bit data bus (byte accesses are possible). Two waitstates give an access time of 100 ns at
40MHz CPU clock. No tristate waitstate is used.
In order to meet the needs of designs where more memory is required than is provided on
chip, up to 16M Bytes of external RAM and/or ROM can be connected to the microcontroller.
If one or the two CAN modules are used, Port 4 can not be programmed to output all 8
segment address lines. Thus, only 4 segment address lines can be used, reducing the
external memory space to 5M Bytes (1M Byte per CS line).
XPWM: Address range 00’EC00h 00’ECFFh is reserved for the XPWM Module access. The
XPWM is enabled by setting XPEN bit 2 of the SYSCON register and bit 4 of the new
XPERCON register. Accesses to the XPWM Module use demultiplexed addresses and a 16-
Memory organization ST10F280
28/239 Doc ID 8673 Rev. 3
bit data bus (byte accesses are possible). Two waitstates give an access time of 100 ns at
40MHz CPU clock. No tristate waitstate is used.
XPORT9, XTIMER, XPORT10, XADCMUX: Address range 00’C000h 00’C3FFh is reserved
for the XPORT9, XPORT10, XTIMER and XADCMUX peripherals access. The XPORT9,
XTIMER, XPORT10, XADCMUX are enabled by setting XPEN bit 2 of the SYSCON register
and the bit 3 of the new XPERCON register. Accesses to the XPORT9, XTIMER, XPORT10
and XADCMUX modules use a 16-bit demultiplexed bus mode without waitstate or
read/write delay (50ns access at 40MHz CPU clock). Byte and word access is allowed.
4.1 Visibility of XBUS peripherals
The XBUS peripherals can be separately selected for being visible to the user by means of
corresponding selection bits in the XPERCON register. If not selected (not activated with
XPERCON bit) before the global enabling with XPEN-bit in SYSCON register, the
corresponding address space, port pins and interrupts are not occupied by the peripheral,
thus the peripheral is not visible and not available. SYSCON register is described in
Section 19.2: System configuration registers.
ST10F280 Memory organization
Doc ID 8673 Rev. 3 29/239
Figure 4. ST10F280 on-chip memory mapping
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Memory organization ST10F280
30/239 Doc ID 8673 Rev. 3
XPERCON
Address: 0xF024h / 12h ESFR
Reset: 0x--05h
Type: R/W
Note: When both CAN and XPWM are disabled via XPERCON setting, then any access in the
address range 00’EC00h 00’EFFFh will be directed to external memory interface, using the
BUSCONx register corresponding to address matching ADDRSELx register. P4.4 and P4.7
can be used as General Purpose I/O when CAN2 is not enabled, and P4.5 and P4.6 can be
used as General Purpose I/O when CAN1 is not enabled.
The default XPER selection after Reset is: XCAN1 is enabled, XCAN2 is disabled, XRAM is
enabled, XPORT9, XTIMER, XPORT10, XPWM, XADCMUX are disabled.
Register XPERCON cannot be changed after the global enabling of XPeripherals, i.e. after
setting of bit XPEN in SYSCON register.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
- - - - - - - - - - - XPWMEN XPERCONEN3 XRAMEN CAN2EN CAN1EN
R/W R/W R/W R/W R/W
CAN1EN CAN1 Enable Bit
0: Accesses to the on-chip CAN1 XPeripheral and its functions are disabled. P4.5
and P4.6 pins can be used as general purpose I/Os. Address range 00’EF00h-
00’EFFFh is only directed to external memory if CAN2EN and XPWM bits are
cleared also.
1: The on-chip CAN1 XPeripheral is enabled and can be accessed.
CAN2EN CAN2 Enable Bit
0: Accesses to the on-chip CAN2 XPeripheral and its functions are disabled. P4.4
and P4.7 pins can be used as general purpose I/Os. Address range 00’EE00h-
00’EEFFh is only directed to external memory if CAN1EN and XPWM bits are
cleared also.
1: The on-chip CAN2 XPeripheral is enabled and can be accessed.
XRAMEN XRAM Enable Bit
0: Accesses to the on-chip 16K Byte XRAM are disabled, external access
performed.
1: The on-chip 16K Byte XRAM is enabled and can be accessed.
XPERCONEN3 XPORT9, XTIMER, XPORT10, XADCMUX Enable Bit
0: Accesses to the XPORT9, XTIMER, XPORT10, XADCMUX peripherals are
disabled, external access performed.
1: The on-chip XPORT9, XTIMER, XPORT10, XADCMUX peripherals are enabled
and can be accessed.
XPWMEN XPWM Enable Bit
0: Accesses to the on-chip XPWM are disabled, external access performed.
Address range 00’EC00h-00’ECFFh is only directed to external memory if CAN1EN
and CAN2EN are ‘0’ also
1: The on-chip XPWM is enabled and can be accessed.
ST10F280 Internal Flash memory
Doc ID 8673 Rev. 3 31/239
5 Internal Flash memory
5.1 Overview
●512K Byte on-chip Flash memory
●Two possibilities of Flash mapping into the CPU address space
●Flash memory can be used for code and data storage
●32-bit, zero waitstate read access (50ns cycle time at fCPU = 40MHz)
●Erase-Program Controller (EPC) similar to M29F400B STM’s stand-alone Flash
memory
– Word-by-Word Programmable (16μs typical)
– Data polling and Toggle Protocol for EPC Status
– Internal Power-On detection circuit
●Memory Erase in blocks
– One 16K Byte, two 8K Byte, one 32K Byte, seven 64K Byte blocks
– Each block can be erased separately (1.5 second typical)
– Chip erase (8.5 second typical)
– Each block can be separately protected against programming and erasing
– Each protected block can be temporary unprotected
– When enabled, the read protection prevents access to data in Flash memory using
a program running out of the Flash memory space. Access to data of internal
Flash can only be performed with an inner protected program
●Erase Suspend and Resume Modes
– Read and Program another Block during erase suspend
●Single Voltage operation, no need of dedicated supply pin
●Low Power Consumption:
– 45mA max. Read current
– 60mA max. Program or Erase current
– Automatic Stand-by-mode (50μA maximum)
●100,000 Erase-Program Cycles per block, 20 year data retention time
●Operating temperature: -40 to +125oC
5.2 Operational overview
5.2.1 Read mode
In standard mode (the normal operating mode) the Flash appears like an on-chip ROM with
the same timing and functionality. The Flash module offers a fast access time, allowing zero
waitstate access with CPU frequency up to 40MHz. Instruction fetches and data operand
reads are performed with all addressing modes of the ST10F280 instruction set.
In order to optimize the programming time of the internal Flash, blocks of 8K Bytes,
16K Bytes, 32K Bytes, 64K Bytes can be used. But the size of the blocks does not apply to
the whole memory space, see details in Ta ble 2 .
Internal Flash memory ST10F280
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5.2.2 Ins tructi ons and commands
All operations besides normal read operations are initiated and controlled by command
sequences written to the Flash Command Interface (CI). The Command Interface (CI)
interprets words written to the Flash memory and enables one of the following operations:
●Read memory array
●Program word
●Block erase
●Chip erase
●Erase suspend
●Erase resume
●Block protection
●Block temporary unprotection
●Code protection
Commands are composed of several write cycles at specific addresses of the Flash
memory. The different write cycles of such command sequences offer a fail-safe feature to
protect against an inadvertent write.
A command only starts when the Command Interface has decoded the last write cycle of an
operation. Until that last write is performed, Flash memory remains in Read Mode
Note: As it is not possible to perform write operations in the Flash while fetching code from Flash,
the Flash commands must be written by instructions executed from internal RAM or external
memory.
Command write cycles do not need to be consecutively received, pauses are allowed, save
for Block Erase command. During this operation all Erase Confirm commands must be sent
to complete any block erase operation before time-out period expires (typically 96
μ
s).
Command sequencing must be followed exactly. Any invalid combination of commands will
reset the Command Interface to Read Mode.
Table 2. 512 Kbyte Flash memory block organization
Block Addresses (segment 0) Addresses (segment 1) Size (Kbyte)
0
1
2
3
4
5
6
7
8
9
10
00’0000h to 00’3FFFh
00’4000h to 00’5FFFh
00’6000h to 00’7FFFh
01’8000h to 01’FFFFh
02’0000h to 02’FFFFh
03’0000h to 03’FFFFh
04’0000h to 04’FFFFh
05’0000h to 05’FFFFh
06’0000h to 06’FFFFh
07’0000h to 07’FFFFh
08’0000h to 08’FFFFh
01’0000h to 01’3FFFh
01’4000h to 01’5FFFh
01’6000h to 01’7FFFh
01’8000h to 01’FFFFh
02’0000h to 02’FFFFh
03’0000h to 03’FFFFh
04’0000h to 04’FFFFh
05’0000h to 05’FFFFh
06’0000h to 06’FFFFh
07’0000h to 07’FFFFh
08’0000h to 08’FFFFh
16
8
8
32
64
64
64
64
64
64
64
ST10F280 Internal Flash memory
Doc ID 8673 Rev. 3 33/239
5.2.3 Status register
This register is used to flag the status of the memory and the result of an operation. This
register can be accessed by read cycles during the Erase-Program Controller (EPC)
operation.
5.2.4 Erase operation
This Flash memory features a block erase architecture with a chip erase capability too.
Erase is accomplished by executing the six cycle erase command sequence. Additional
command write cycles can then be performed to erase more than one block in parallel.
When a time-out period elaps (96μs) after the last cycle, the Erase-Program Controller
(EPC) automatically starts and times the erase pulse and executes the erase operation.
There is no need to program the block to be erased with ‘0000h’ before an erase operation.
Termination of operation is indicated in the Flash status register. After erase operation, the
Flash memory locations are read as 'FFFFh’ value.
5.2.5 Erase suspend
A block erase operation is typically executed within 1.5 second for a 64K Byte block. Erasure
of a memory block may be suspended, in order to read data from another block or to
program data in another block, and then resumed.
5.2.6 In-system programming
In-system programming is fully supported. No special programming voltage is required.
Because of the automatic execution of erase and programming algorithms, write operations
are reduced to transferring commands and data to the Flash and reading the status. Any
code that programs or erases Flash memory locations (that writes data to the Flash) must
be executed from memory outside the on-chip Flash memory itself (on-chip RAM or external
memory).
A boot mechanism is provided to support in-system programming. It works using serial link
via USART interface and a PC compatible or other programming host.
5.2.7 Read/write protection
The Flash module supports read and write protection in a very comfortable and advanced
protection functionality. If Read Protection is installed, the whole Flash memory is protected
against any "external" read access; read accesses are only possible with instructions
fetched directly from program Flash memory. For update of the Flash memory a temporary
disable of Flash Read Protection is supported.
The device also features a block write protection. Software locking of selectable memory
blocks is provided to protect code and data. This feature will disable both program and erase
operations in the selected block(s) of the memory. Block Protection is accomplished by block
specific lock-bit which are programmed by executing a four cycle command sequence. The
locked state of blocks is indicated by specific flags in the according block status registers. A
block may only be temporarily unlocked for update (write) operations.
With the two possibilities for write protection whole memory or block specific a flexible
installation of write protection is supported to protect the Flash memory or parts of it from
unauthorized programming or erase accesses and to provide virus-proof protection for all
system code blocks. All write protection also is enabled during boot operation.
Internal Flash memory ST10F280
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5.2.8 Power supply, reset
The Flash module uses a single power supply for both read and write functions. Internally
generated and regulated voltages are provided for the program and erase operations from
5V supply. Once a program or erase cycle has been completed, the device resets to the
standard read mode. At power-on, the Flash memory has a setup phase of some
microseconds (dependent on the power supply ramp-up). During this phase, Flash can not
be read. Thus, if EA pin is high (execution will start from Flash memory), the CPU remains in
reset state until the Flash can be accessed.
5.3 Architectural description
The Flash module distinguishes two basic operating modes, the standard read mode and
the command mode. The initial state after power-on and after reset is the standard read
mode.
5.3.1 Read mode
The Flash module enters the standard operating mode, the read mode:
●After reset command
●After every completed erase operation
●After every completed programming operation
●After every other completed command execution
●Few microseconds after a CPU-reset has started
●After incorrect address and data values of command sequences or writing them in an
improper sequence
●After incorrect write access to a read protected Flash memory
The read mode remains active until the last command of a command sequence is decoded
which starts directly a Flash array operation, such as:
●Erase one or several blocks
●Program a word into Flash array
●Protect / temporary unprotect a block.
In the standard read mode read accesses are directly controlled by the Flash memory array,
delivering a 32-bit double Word from the addressed position. Read accesses are always
aligned to double Word boundaries. Thus, both low order address bit A1 and A0 are not
used in the Flash array for read accesses. The high order address bit A18/A17/A16 define
the physical 64K Bytes segment being accessed within the Flash array.
5.3.2 Command mode
Every operation besides standard read operations is initiated by commands written to the
Flash command register. The addresses used for command cycles define in conjunction
with the actual state the specific step within command sequences. With the last command of
a command sequence, the Erase-Program Controller (EPC) starts the execution of the
command. The EPC status is indicated during command execution by:
●Status Register
●Ready/Busy signal
ST10F280 Internal Flash memory
Doc ID 8673 Rev. 3 35/239
5.3.3 Flash Status Register
The Flash Status register is used to flag the status of the Flash memory and the result of an
operation. This register can be accessed by Read cycles during the program-Erase
Controller operations. The program or erase operation can be controlled by data polling on
bit FSB.7 of Status Register, detection of Toggle on FSB.6 and FSB.2, or Error on FSB.5
and Erase Timeout on FSB.3 bit. Any read attempt in Flash during EPC operation will
automatically output these five bits. The EPC sets bit FSB.2, FSB.3, FSB.5, FSB.6 and
FSB.7. Other bit are reserved for future use and should be masked.
Flash Status
Address: See note for address
Type: R
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
--------FSB.7FSB.6FSB.5-FSB.3FSB.2--
RRR RR
FSB.7 Flash Status bit 7: Data Polling Bit
Programming Operation: this bit outputs the complement of the bit 7 of the word being
programmed, and after completion, will output the bit 7 of the word programmed.
Erasing Operation: outputs a ‘0’ during erasing, and ‘1’ after erasing completion.
If the block selected for erasure is (are) protected, FSB.7 will be set to ‘0’ for about 100 µs,
and then return to the previous addressed memory data value.
FSB.7 will also flag the Erase Suspend Mode by switching from ‘0’ to ‘1’ at the start of the
Erase Suspend.
During Program operation in Erase Suspend Mode, FSB.7 will have the same behaviour as
in normal Program execution outside the Suspend mode.
FSB.6 Flash Status bit 6: Toggle Bit
Programming or Erasing Operations: successive read operations of Flash Status register will
deliver complementary values. FSB.6 will toggle each time the Flash Status register is read.
The Program operation is completed when two successive reads yield the same value. The
next read will output the bit last programmed, or a ‘1’ after Erase operation
FSB.6 will be set to‘1’ if a read operation is attempted on an Erase Suspended block. In
addition, an Erase Suspend/Resume command will cause FSB.6 to toggle.
FSB.5 Flash Status bit 5: Error Bit
This bit is set to ‘1’ when there is a failure of Program, block or chip erase operations.This bit
will also be set if a user tries to program a bit to ‘1’ to a Flash location that is currently
programmed with ‘0’.
The error bit resets after Read/Reset instruction.
In case of success, the Error bit will be set to ‘0’ during Program or Erase and then will
output the bit last programmed or a ‘1’ after erasing
FSB.3 Flash Status bit 3: Erase Time-out Bit
This bit is cleared by the EPC when the last Block Erase command has been entered to the
Command Interface and it is awaiting the Erase start. When the time-out period is finished,
after 96 µs, FSB.3 returns back to ‘1’.
Internal Flash memory ST10F280
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Note: The Address of Flash Status Register is the address of the word being programmed when
Programming operation is in progress, or an address within block being erased when
Erasing operation is in progress.
5.3.4 Flash Protection Register
The Flash Protection register is a non-volatile register that contains the protection status.
This register can be read by using the Read Protection Status (RP) command, and
programmed by using the dedicated Set Protection command.
Flash Protection Register (PR)
Type: R/W
5.3.5 Instructions description
Twelve instructions dedicated to Flash memory accesses are defined as follow:
Read/Reset (RD). The Read/Reset instruction consist of one write cycle with data XXF0h. it
can be optionally preceded by two CI enable coded cycles (data xxA8h at address 1554h +
FSB.2 Flash Status bit 2: Toggle Bit
This toggle bit, together with FSB.6, can be used to determine the chip status during the
Erase Mode or Erase Suspend Mode. It can be used also to identify the block being Erased
Suspended. A Read operation will cause FSB.2 to Toggle during the Erase Mode. If the
Flash is in Erase Suspend Mode, a Read operation from the Erase suspended block or a
Program operation into the Erase suspended block will cause FSB.2 to toggle.
When the Flash is in Program Mode during Erase Suspend, FSB.2 will be read as ‘1’ if
address used is the address of the word being programmed.
After Erase completion with an Error status, FSB.2 will toggle when reading the faulty sector.
151413121110987654 3 2 10
CP----BP10BP9BP8BP7BP6BP5BP4BP3BP2BP1BP0
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
BPx Block x Protection bit (x = 0...10)
‘0’: the Block Protection is enabled for block x. Programming or erasing the block is not
possible, unless a Block Temporary Unprotection command is issued.
1’: the Block Protection is disabled for block x.
Bit is ‘1’ by default, and can be programmed permanently to ‘0’ using the Set Protection
command but then cannot be set to ‘1’ again. It is therefore possible to temporally disable
the Block Protection using the Block Temporary Unprotection instruction.
CP Code Protection Bit
‘0’: the Flash Code Protection is enabled. Read accesses to the Flash for execution not
performed in the Flash itself are not allowed, the returned value will be 009Bh, whatever the
content of the Flash is.
1’: the Flash Code Protection is disabled: read accesses to the Flash from external or
internal RAM are allowed
Bit is ‘1’ by default, and can be programmed permanently to ‘0’ using the Set Protection
command but then cannot be set to ‘1’ again. It is therefore possible to temporarily disable
the Code Protection using the Code Temporary Unprotection instruction.
ST10F280 Internal Flash memory
Doc ID 8673 Rev. 3 37/239
data xx54h at address 2AA8h). Any successive read cycle following a Read/Reset
instruction will read the memory array. A Wait cycle of 10µs is necessary after a Read/Reset
command if the memory was in program or Erase mode.
Program Word (PW). This instruction uses four write cycles. After the two Cl enable coded
cycles, the Program Word command xxA0h is written at address 1554h. The following write
cycle will latch the address and data of the word to be programmed. Memory programming
can be done only by writing 0's instead of 1's, otherwise an error occurs. During
programming, the Flash Status is checked by reading the Flash Status bit FSB.2, FSB.5,
FSB.6 and FSB.7 which show the status of the EPC. FSB.2, FSB.6 and FSB.7 determine if
programming is on going or has completed, and FSB.5 allows a check to be made for any
possible error.
Block Erase (BE). This instruction uses a minimum of six command cycles. The erase
enable command xx80h is written at address 1554h after the two-cycle CI enable sequence.
The erase confirm code xx30h must be written at an address related to the block to be
erased preceded by the execution of a second CI enable sequence. Additional erase
confirm codes must be given to erase more than one block in parallel. Additional erase
confirm commands must be written within a defined time-out period. The input of a new
Block Erase command will restart the time-out period.
When this time-out period has elapsed, the erase starts. The status of the internal timer can
be monitored through the level of FSB.3, if FSB.3 is ‘0’, the Block Erase command has been
given and the timeout is running; if FSB.3 is ‘1’, the timeout has expired and the EPC is
erasing the block(s).
If the second command given is not an erase confirm or if the coded cycles are wrong, the
instruction aborts, and the device is reset to Read Mode. It is not necessary to program the
block with 0000h as the EPC will do this automatically before the erasing to FFFFh. Read
operations after the EPC has started, output the Flash Status Register. During the execution
of the erase by the EPC, the device accepts only the Erase Suspend and Read/Reset
instructions. Data Polling bit FSB.7 returns ‘0’ while the erasure is in progress, and ‘1’ when
it has completed. The Toggle bit FSB.2 and FSB.6 toggle during the erase operation. They
stop when erase is completed. After completion, the Error bit FSB.5 returns ‘1’ if there has
been an erase failure because erasure has not completed even after the maximum number
of erase cycles have been executed by the EPC, in this case, it will be necessary to input a
Read/Reset to the Command Interface in order to reset the EPC.
Chip Erase (CE). This instruction uses six write cycles. The Erase Enable command xx80h,
must be written at address 1554h after CI-Enable cycles. The Chip Erase command xx10h
must be given on the sixth cycle after a second CI-Enable sequence. An error in command
sequence will reset the CI to Read mode. It is NOT necessary to program the block with
0000h as the EPC will do this automatically before the erasing to FFFFh. Read operations
after the EPC has started output the Flash Status Register. During the execution of the
erase by the EPC, Data Polling bit FSB.7 returns ‘0’ while the erasure is in progress, and ‘1’
when it has completed. The FSB.2 and FSB.6 bit toggle during the erase operation. They
stop when erase is finished. The FSB.5 error bit returns "1" in case of failure of the erase
operation. The error flag is set after the maximum number of erase cycles have been
executed by the EPC. In this case, it will be necessary to input a Read/Reset to the
Command Interface in order to reset the EPC.
Erase Suspend (ES). This instruction can be used to suspend a Block Erase operation by
giving the command xxB0h without any specific address. No CI-Enable cycles is required.
Erase Suspend operation allows reading of data from another block and/or the programming
in another block while erase is in progress. If this command is given during the time-out
Internal Flash memory ST10F280
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period, it will terminate the time-out period in addition to erase Suspend. The Toggle Bit
FSB.6, when monitored at an address that belongs to the block being erased, stops toggling
when Erase Suspend Command is effective, It happens between 0.1μs and 15μs after the
Erase Suspend Command has been written. The Flash will then go in normal Read Mode,
and read from blocks not being erased is valid, while read from block being erased will
output FSB.2 toggling. During a Suspend phase the only instructions valid are Erase
Resume and Program Word. A Read / Reset instruction during Erase suspend will definitely
abort the Erase and result in invalid data in the block being erased.
Erase Resume (ER). This instruction can be given when the memory is in Erase Suspend
State. Erase can be resumed by writing the command xx30h at any address without any Cl-
enable sequence.
Program during Erase Suspend. The Program Word instruction during Erase Suspend is
allowed only on blocks that are not Erase-suspended. This instruction is the same than the
Program Word instruction.
Set Protection (SP). This instruction can be used to enable both Block Protection (to
protect each block independently from accidental Erasing-Programming Operation) and
Code Protection (to avoid code dump). The Set Protection Command must be given after a
special CI-Protection Enable cycles (see instruction table). The following Write cycle, will
program the Protection Register. To protect the block x (x = 0 to 10), the data bit x must be at
‘0’. To protect the code, bit 15 of the data must be ‘0’. Enabling Block or Code Protection is
permanent and can be cleared only by STM. Block Temporary Unprotection and Code
Temporary Unprotection instructions are available to allow the customer to update the code.
Note: The new value programmed in protection register will only become active after a reset.
Bit that are already at ’0’ in protection register must be confirmed at ’0’ also in data latched
during the 4th cycle of set protection command, otherwise an error may occur.
Read Protection Status (RP). This instruction is used to read the Block Protection status
and the Code Protection status. To read the protection register (see Tab le 3), the CI-
Protection Enable cycles must be executed followed by the command xx90h at address
x2A54h. The following Read Cycles at any odd word address will output the Block
Protection Status. The Read/Reset command xxF0h must be written to reset the protection
interface.
Note: After a modification of protection register (using Set Protection command), the Read
Protection Status will return the new PR value only after a reset.
Block Temporary Unprotection (BTU). This Instruction can be used to temporary
unprotect all the blocks from Program / Erase protection. The Unprotection is disabled after
a Reset cycle. The Block Temporary Unprotection command xxC1h must be given to enable
Block Temporary Unprotection. The Command must be preceded by the CI-Protection
Enable cycles and followed by the Read/Reset command xxF0h.
Set Code Protection (SCP). This kind of protection allows the customer to protect the
proprietary code written in Flash. If installed and active, Flash Code Protection prevents
data operand accesses and program branches into the on-chip Flash area from any location
outside the Flash memory itself. Data operand accesses and branches to Flash locations
are only and exclusively allowed for instructions executed from the Flash memory itself.
Every read or jump to Flash performed from another memory (like internal RAM, external
memory) while Code Protection is enabled, will give the opcode 009Bh related to TRAP #00
illegal instruction. The CI-Protection Enable cycles must be sent to set the Code Protection.
By writing data 7FFFh at any odd word address, the Code Protected status is stored in the
Flash Protection Register (PR). Protection is permanent and cannot be cleared by the user.
ST10F280 Internal Flash memory
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It is possible to temporarily disable the Code Protection using Code Temporary Unprotection
instruction.
Note: Bits that are already at ’0’ in protection register must be confirmed at ’0’ also in data latched
during the 4th cycle of set protection command, otherwise an error may occur.
Code Temporary Unprotection (CTU). This instruction must be used to temporary disable
Code Protection. This instruction is effective only if executed from Flash memory space. To
restore the protection status, without using a reset, it is necessary to use a Code Temporary
Protection instruction. System reset will reset also the Code Temporary Unprotected status.
The Code Temporary Unprotection command consists of the following write cycle:
MOV MEM, Rn ; This instruction MUST be executed from Flash memory space
Where MEM is an absolute address inside memory space, Rn is a register loaded with data
0FFFFh.
Code Temporary Protection (CTP). This instruction allows to restore Code Protection.
This operation is effective only if executed from Flash memory and is necessary to restore
the protection status after the use of a Code Temporary Unprotection instruction.
The Code Temporary Protection command consists of the following write cycle:
MOV MEM, Rn ; This instruction MUST be executed from Flash memory space
Where MEM is an absolute address inside memory space, Rn is a register loaded with data
0FFFBh.
Note that Code Temporary Unprotection instruction must be used when it is necessary to
modify the Flash with protected code (SCP), since the write/erase routines must be
executed from a memory external to Flash space. Usually, the write/erase routines,
executed in RAM, ends with a return to Flash space where a CTP instruction restore the
protection.
Table 3. Instructions
Instruction Mne Cycle 1st
Cycle 2nd
Cycle 3rd
Cycle 4th
Cycle 5th
Cycle 6th
Cycle 7th
Cycle
Read/Reset RD 1+ Addr.(1) X(2)
Read Memory Array until a new write cycle is initiated
Data xxF0h
Read/Reset RD 3+ Addr.(1) x1554h x2AA8h xxxxxh Read Memory Array until a new write
cycle is initiated
Data xxA8h xx54h xxF0h
Program Word PW 4
Addr.(1) x1554h x2AA8h x1554h WA(3) Read Data Polling or
Toggle Bit until Program
completes.
Data xxA8h xx54h xxA0h WD(4)
Block Erase BE 6 Addr.(1) x1554h x2AA8h x1554h x1554h x2AA8h BA BA’(5)
Data xxA8h xx54h xx80h xxA8h xx54h xx30h xx30h
Chip Erase CE 6 Addr.(1) x1554h x2AA8h x1554h x1554h x2AA8h x1554h Note
(6)
Data xxA8h xx54h xx80h xxA8h xx54h xx10h
Erase Suspend ES 1 Addr.(1) X(2) Read until Toggle stops, then read or program all data
needed from block(s) not being erased then Resume Erase.
Data xxB0h
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●Generally, command sequences cannot be written to Flash by instructions fetched from
the Flash itself. Thus, the Flash commands must be written by instructions, executed
from internal RAM or external memory.
●Command cycles on the CPU interface need not to be consecutively received (pauses
allowed). The CPU interface delivers dummy read data for not used cycles within
command sequences.
●All addresses of command cycles shall be defined only with Register-indirect
addressing mode in the according move instructions. Direct addressing is not allowed
for command sequences. Address segment or data page pointer are taken into account
for the command address value.
Erase Resume ER 1 Addr.(1) X(2) Read Data Polling or Toggle bit until Erase completes or
Erase is suspended another time.
Data xx30h
Set Block/Code
Protection SP 4 Addr.(1) x2A54h x15A8h x2A54h
Any odd
word
address(7)
Data xxA8h xx54h xxC0h WPR(8)
Read Protection
Status RP 4
Addr.(1) x2A54h x15A8h x2A54h
Any odd
word
address(7) Read Protection Register
until a new write cycle is
initiated.
Data xxA8h xx54h xx90h Read
PR
Block
Temporary
Unprotection
BTU 4
Addr.(1) x2A54h x15A8h x2A54h X(2)
Data xxA8h xx54h xxC1h xxF0h
Code
Temporary
Unprotection
CTU 1
Addr.(1) MEM(9)
Write cycles must be executed from Flash.
Data FFFFh
Code
Temporary
Protection
CTP 1
Addr.(1) MEM(9)
Write cycles must be executed from Flash.
Data FFFBh
1. Address bit A14, A15 and above are don’t care for coded address inputs.
2. X = do not care.
3. WA = Write Address: address of memory location to be programmed.
4. WD = Write Data: 16-bit data to be programmed.
5. Optional, additional blocks addresses must be entered within a time-out delay (96 µs) after last write entry, timeout status
can be verified through FSB.3 value. When full command is entered, read Data Polling or Toggle bit until Erase is
completed or suspended
6. Read Data Polling or Toggle bit until Erase completes.
7. Odd word address = 4n-2 where n = 0, 1, 2, 3..., ex. 0002h, 0006h...
8. WPR = Write protection register. To protect code, bit 15 of WPR must be ‘0’. To protect block N (N=0,1,...), bit N of WPR
must be ‘0’. Bit that are already at ‘0’ in protection register must also be ‘0’ in WPR, else a writing error will occurs (it is not
possible to write a ‘1’ in a bit already programmed at ‘0’).
9. MEM = any address inside the Flash memory space. Absolute addressing mode must be used (MOV MEM, Rn), and
instruction must be executed from Flash memory space.
Table 3. Instructions (continued)
Instruction Mne Cycle 1st
Cycle 2nd
Cycle 3rd
Cycle 4th
Cycle 5th
Cycle 6th
Cycle 7th
Cycle
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5.3.6 Reset processing and initial State
The Flash module distinguishes two kinds of CPU reset types
The lengthening of CPU reset:
● Is not reported to external devices by bidirectional pin
● Is not enabled in case of external start of CPU after reset.
5.4 Flash memory configuration
The default memory configuration of the ST10F280 Memory is determined by the state of
the EA pin at reset. This value is stored in the Internal ROM Enable bit (named ROMEN) of
the SYSCON register.
When ROMEN = 0, the internal Flash is disabled and external ROM is used for startup
control. Flash memory can later be enabled by setting the ROMEN bit of SYSCON to 1. The
code performing this setting must not run from a segment of the external ROM to be
replaced by a segment of the Flash memory, otherwise unexpected behaviour may occur.
For example, if external ROM code is located in the first 32K Bytes of segment 0, the first
32K Bytes of the Flash must then be enabled in segment 1. This is done by setting the
ROMS1 bit of SYSCON to 0 before or simultaneously with setting of ROMEN bit. This must
be done in the externally supplied program before the execution of the EINIT instruction.
If program execution starts from external memory, but access to the Flash memory mapped
in segment 0 is later required, then the code that performs the setting of ROMEN bit must be
executed either in the segment 0 but above address 00’8000h, or from the internal RAM.
Bit ROMS1 only affects the mapping of the first 32K Bytes of the Flash memory. All other
parts of the Flash memory (addresses 01’8000h 08’FFFFh) remain unaffected.
The SGTDIS Segmentation Disable / Enable must also be set to 0 to allow the use of the full
512K Bytes of on-chip memory in addition to the external boot memory. The correct
procedure on changing the segmentation registers must also be observed to prevent an
unwanted trap condition:
●Instructions that configure the internal memory must only be executed from external
memory or from the internal RAM.
●An Absolute Inter-Segment Jump (JMPS) instruction must be executed after Flash
enabling, to the next instruction, even if this next instruction is located in the
consecutive address.
●Whenever the internal Memory is disabled, enabled or remapped, the DPPs must be
explicitly (re)loaded to enable correct data accesses to the internal memory and/or
external memory.
5.5 Application examples
5.5.1 Handling of Flash addresses
All command, Block, Data and register addresses to the Flash have to be located within the
active Flash memory space. The active space is that address range to which the physical
Flash addresses are mapped as defined by the user. When using data page pointer (DPP)
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for block addresses make sure that address bit A15 and A14 of the block address are
reflected in both LSBs of the selected DPPS.
Note: For Command Instructions, address bit A14, A15, A16, A17 and A18 are don’t care. This
simplify a lot the application software, because it minimize the use of DPP registers when
using Command in the Command Interface.
Direct addressing is not allowed for Command sequence operations to the Flash. Only
Register-indirect addressing can be used for command, block or write-data accesses.
5.5.2 Bas ic Flash access control
When accessing the Flash all command write addresses have to be located within the active
Flash memory space. The active Flash memory space is that logical address range which is
covered by the Flash after mapping. When using data page pointer (DPP) for addressing the
Flash, make sure that address bit A15 and A14 of the command addresses are reflected in
both LSBs of the selected data page pointer (A15 DPPx.1 and A14 DPPx.0).
In case of the command write addresses, address bit A14, A15 and above are “don’t care”.
Thus, command writes can be performed by only using one DPP register. This allows to
have a simpler and more compact application software.
Another advantageous possibility is to use the extended segment instruction for addressing.
Note: The direct addressing mode is not allowed for write access to the Flash address/command
register. Be aware that the C compiler may use this kind of addressing. For write accesses
to Flash module always the indirect addressing mode has to be selected.
The following basic instruction sequences show examples for different addressing
possibilities.
Principle example of address generation for Flash commands and register s:
When using data page pointer (DPP0 is this example)
MOV DPP0,#08h ;adjust data page pointers according to the
;addresses: DPP0 is used in this example, thus
;ADDRESS must have A14 and A15 bit set to ‘0’.
MOV Rwm,#ADDRESS ;ADDRESS could be a dedicated command sequence
;address 2AA8h, 1554h ... ) or the Flash write
;address
MOV Rwn,#DATA ;DATA could be a dedicated command sequence data
;(xxA0h,xx80h ... ) or data to be programmed
MOV [Rwm],Rwn ;indirect addressing
When using the extended segment instruction:
MOV Rwm,#ADDRESS ;ADDRESS could be a dedicated command sequence
;address (2AA8h, 1554h ... ) or the Flash write
;address
MOV Rwo,#DATA ;DATA could be a dedicated command sequence data
;(xxA0h,xx80h ... ) or data to be programmed
MOV Rwn,#SEGMENT ;the value of SEGMENT represents the segment
;number and could be 0, 1, 2, 3 or 4 (depending
;on sector mapping) for 256KByte Flash.
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EXTS Rwn,#LENGTH ;the value of Rwn determines the 8-bit segment
;valid for the corresponding data access for any
;long or indirect address in the following(s)
;instruction(s). LENGTH defines the number of
;the effected instruction(s) and has to be a value
;between 1...4
MOV [Rwm],Rwo ;indirect addressing with segment number from
;EXTS
5.5.3 Programming examples
Most of the microcontroller programs are written in the C language where the data page
pointers are automatically set by the compiler. But because the C compiler may use the not
allowed direct addressing mode for Flash write addresses, it is necessary to program the
organizational Flash accesses (command sequences) with assembler in-line routines which
use indirect addressing.
Example 1: Performing the command Read/Reset
We assume that in the initialization phase the lowest 32K Bytes of Flash memory (sector 0)
have been mapped to segment 1.
According to the usual way of ST10 data addressing with data page pointers, address bit
A15 and A14 of a 16-bit command write address select the data page pointer (DPP) which
contains the upper 10-bit for building the 24-bit physical data address. Address bit A13...A0
represent the address offset. As the bit A14...A18 are "don’t care" when written a Flash
command in the Command Interface (CI), we can choose the most convenient DPPx
register for address handling.
The following examples are making usage of DPP0. We just have to make sure, that DPP0
points to active Flash memory space.
To be independent of mapping of sector 0 we choose for all DPPs which are used for Flash
address handling, to point to segment 2.
For this reason we load DPP0 with value 08h (00 0000 l000b).
MOV R5, #01554h ;load auxilary register R5 with command address
;(used in command cycle 1)
MOV R6, #02AA8h ;load auxilary register R6 with command address
;(used in command cycle 2)
SCXT DPPO, #08h ;push data page pointer 0 and load it to point to
;segment 2
MOV R7, #0A8h ;load register R7 with 1st CI enable command
MOV [R5], R7 ;command cycle 1
MOV R7, #054h ;load register R7 with 2cd CI enable command
MOV [R6], R7 ;command cycle 2
MOV R7, #0F0h ;load register R7 with Read/Reset command
MOV [R5], R7 ;command cycle 3. Address is don’t care
POP DPP0 ;restore DPP0 value
In the example above the 16-bit registers R5 and R6 are used as auxiliary registers for
indirect addressing.
Internal Flash memory ST10F280
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Example 2: Performing a Program Word command
We assume that in the initialization phase the lowest 32K Bytes of Flash memory (sector 0)
have been mapped to segment 1.The data to be written is loaded in register R13, the
address to be programmed is loaded in register R11/R12 (segment number in R11,
segment offset in R12).
MOV R5, #01554h ;load auxilary register R5 with command address
;(used in command cycle 1)
MOV R6, #02AA8h ;load auxilary register R6 with command address
;(used in command cycle 2)
SXCT DPPO, #08h ;push data page pointer 0 and load it to point to
;segment 2
MOV R7, #0A8h ;load register R7 with 1st CI enable command
MOV [R5], R7 ;command cycle 1
MOV R7, #054h ;load register R7 with 2cd CI enable command
MOV [R6], R7 ;command cycle 2
MOV R7, #0A0h ;load register R7 with Program Word command
MOV [R5], R7 ;command cycle 3
POP DPP0 ;restore DPP0: following addressing to the Flash
;will use EXTended instructions
;R11 contains the segment to be programmed
;R12 contains the segment offset address to be
;programmed
;R13 contains the data to be programmed
EXTS R11, #1 ;use EXTended addressing for next MOV instruction
MOV [R12], R13 ;command cycle 4: the EPC starts execution of
;Programming Command
Data_Polling:
EXTS R11, #1 ;use EXTended addressing for next MOV instruction
MOV R7, [R12] ;read Flash Status register (FSB) in R7
MOV R6, R7 ;save it in R6 register
;Check if FSB.7 = Data.7 (i.e. R7.7 = R13.7)
XOR R7, R13
JNB R7.7, Prog_OK
;Check if FSB.5 = 1 (Programming Error)
JNB R6.5, Data_Polling
;Programming Error: verify is Flash programmed
;data is OK
EXTS R11, #1 ;use EXTended addressing for next MOV instruction
MOV R7, [R12] ;read Flash Status register (FSB) in R7
;Check if FSB.7 = Data.7
XOR R7, R13
JNB R7.7, Prog_OK
;Programming failed: Flash remains in Write
;Operation.
;To go back to normal Read operations, a Read/Reset
ST10F280 Internal Flash memory
Doc ID 8673 Rev. 3 45/239
;command
;must be performed
Prog_Error:
MOV R7, #0F0h ;load register R7 with Read/Reset command
EXTS R11, #1 ;use EXTended addressing for next MOV instruction
MOV [R12], R7 ;address is don’t care for Read/Reset command
... ;here place specific Error handling code
...
...
;When programming operation finished succesfully,
;Flash is set back automatically to normal Read Mode
Prog_OK:
....
....
Example 3: Performing the Block Erase command
We assume that in the initialization phase the lowest 32K Bytes of Flash memory (sector 0)
have been mapped to segment 1.The registers R11/R12 contain an address related to the
block to be erased (segment number in R11, segment offset in R12, for example R11 = 01h,
R12= 4000h will erase the block 1 first 8K byte block).
MOV R5, #01554h ;load auxilary register R5 with command address
;(used in command cycle 1)
MOV R6, #02AA8h ;load auxilary register R6 with command address
;(used in command cycle 2)
SXCT DPPO, #08h ;push data page pointer 0 and load it to point
;to
;segment 2
MOV R7, #0A8h ;load register R7 with 1st CI enable command
MOV [R5], R7 ;command cycle 1
MOV R7, #054h ;load register R7 with 2cd CI enable command
MOV [R6], R7 ;command cycle 2
MOV R7, #080h ;load register R7 with Block Erase command
MOV [R5], R7 ;command cycle 3
MOV R7, #0A8h ;load register R7 with 1st CI enable command
MOV [R5], R7 ;command cycle 4
MOV R7, #054h ;load register R7 with 2cd CI enable command
MOV [R6], R7 ;command cycle 5
POP DPP0 ;restore DPP0: following addressing to the Flash
;will use EXTended instructions
;R11 contains the segment of the block to be erased
;R12 contains the segment offset address of the
;block to be erased
MOV R7, #030h ;load register R7 with erase confirm code
EXTS R11, #1 ;use EXTended addressing for next MOV instruction
MOV [R12], R7 ;command cycle 6: the EPC starts execution of
Internal Flash memory ST10F280
46/239 Doc ID 8673 Rev. 3
;Erasing Command
Erase_Polling:
EXTS R11, #1 ;use EXTended addressing for next MOV instruction
MOV R7, [R12] ;read Flash Status register (FSB) in R7
;Check if FSB.7 = ‘1’ (i.e. R7.7 = ‘1’)
JB R7.7, Erase_OK
;Check if FSB.5 = 1 (Erasing Error)
JNB R7.5, Erase_Polling
;Programming failed: Flash remains in Write
;Operation.
;To go back to normal Read operations, a Read/Reset
;command ;must be performed
Erase_Error:
MOV R7, #0F0h ;load register R7 with Read/Reset command
EXTS R11, #1 ;use EXTended addressing for next MOV instruction
MOV [R12], R7 ;address is don’t care for Read/Reset command
... ;here place specific Error handling code
...
...
;When erasing operation finished succesfully,
;Flash is set back automatically to normal Read Mode
Erase_OK:
....
....
5.6 Bootstrap loader
The built-in bootstrap loader (BSL) of the ST10F280 provides a mechanism to load the
startup program through the serial interface after reset. In this case, no external memory or
internal Flash memory is required for the initialization code starting at location 00’0000h
(see Figure 5).
The bootstrap loader moves code/data into the internal RAM, but can also transfer data via
the serial interface into an external RAM using a second level loader routine. ROM Memory
(internal or external) is not necessary, but it may be used to provide lookup tables or “core-
code” like a set of general purpose subroutines for I/O operations, number crunching,
system initialization, etc.
The bootstrap loader can be used to load the complete application software into ROMless
systems, to load temporary software into complete systems for testing or calibration, or to
load a programming routine for Flash devices.
The BSL mechanism can be used for standard system startup as well as for special
occasions like system maintenance (firmer update) or end-of-line programming or testing.
ST10F280 Internal Flash memory
Doc ID 8673 Rev. 3 47/239
5.6.1 Entering the bootstrap loader
The ST10F280 enters BSL mode when pin P0L.4 is sampled low at the end of a hardware
reset. In this case the built-in bootstrap loader is activated independent of the selected bus
mode.
The bootstrap loader code is stored in a special Boot-ROM. No part of the standard mask
Memory or Flash Memory area is required for this.
After entering BSL mode and the respective initialization the ST10F280 scans the RxD0 line
to receive a zero Byte, one start Bit, eight ‘0’ data Bits and one stop Bit.
From the duration of this zero Byte it calculates the corresponding Baud rate factor with
respect to the current CPU clock, initializes the serial interface ASC0 accordingly and
switches pin TXD0 to output.
Using this Baud rate, an identification Byte is returned to the host that provides the loaded
data.
This identification Byte identifies the device to be booted. Identification byte is D5h for the
ST10F280.
Figure 5. Bootstrap loader sequence
234).
48$
)NTERNAL"OOT-EMORY"3,ROUTINE "YTEUSERSOFTWARE
2X$
#30)0
0,
"3,INITIALIZATIONTIME
:ERO"YTESTART"ITEIGHT@DATA"ITSSTOP"ITSENTBYHOST
)DENTIFICATION"YTE$HSENTBY34&
"YTESOFCODEDATASENTBYHOST
#AUTION48$ISONLYDRIVENACERTAINTIMEAFTERRECEPTIONOFTHEZERO"YTE
)NTERNAL"OOT2/-
("1($'5
Internal Flash memory ST10F280
48/239 Doc ID 8673 Rev. 3
When the ST10F280 has entered BSL mode, the following configuration is automatically set
(values that deviate from the normal reset values, are marked):
In this case, the watchdog timer is disabled, so the bootstrap loading sequence is not time
limited.
Pin TXD0 is configured as output, so the ST10F280 can return the identification Byte.
Even if the internal Flash is enabled, no code can be executed out of it.
The hardware that activates the BSL during reset may be a simple pull-down resistor on
P0L.4 for systems that use this feature upon every hardware reset.
A switchable solution (via jumper or an external signal) can be used for systems that
only temporarily use the bootstrap loader (see Figure 6).
After sending the identification Byte the ASC0 receiver is enabled and is ready to
receive the initial 32 Bytes from the host. A half duplex connection is therefore sufficient to
feed the BSL.
5.6.2 Memory configuration after reset
The configuration (and the accessibility) of the ST10F280’s memory areas after reset in
Bootstrap-Loader mode differs from the standard case. Pin EA is not evaluated when BSL
mode is selected, and accesses to the internal Flash area are partly redirected, while the
ST10F280 is in BSL mode (see Figure 7). All code fetches are made from the special Boot-
ROM, while data accesses read from the internal user Flash. Data accesses will return
undefined values on ROMless devices.
The code in the Boot-ROM is not an invariant feature of the ST10F280. User software
should not try to execute code from the internal Flash area while the BSL mode is still active,
as these fetches will be redirected to the Boot-ROM. The Boot-ROM will also “move” to
segment 1, when the internal Flash area is mapped to segment 1 (see Figure 7).
Watchdog Timer: Disabled Register SYSCON: 0E00h
Context Pointer CP: FA00h Register STKUN: FA40h
Stack Pointer SP: FA40h Register STKOV: FA0Ch 0<->C
Register S0CON: 8011h Register BUSCON0: acc. to startup
configuration
Register S0BG: Acc. to ‘00’ Byte P3.10 / TXD0: ‘1’
DP3.10: ‘1’
ST10F280 Internal Flash memory
Doc ID 8673 Rev. 3 49/239
Figure 6. Hardware provisions to activate the BSL
Figure 7. Memory configuration after reset
5.6.3 Loading the startup code
After sending the identification Byte the BSL enters a loop to receive 32 Bytes via ASC0.
These Byte are stored sequentially into locations 00’FA40h through 00’FA5Fh of the internal
RAM. So up to 16 instructions may be placed into the RAM area. To execute the loaded
code the BSL then jumps to location 00’FA40h, which is the first loaded instruction.
The bootstrap loading sequence is now terminated, the ST10F280 remains in BSL mode,
however. Most probably the initially loaded routine will load additional code or data, as an
average application is likely to require substantially more than 16 instructions. This second
receive loop may directly use the pre-initialized interface ASC0 to receive data and store it to
arbitrary user-defined locations.
This second level of loaded code may be the final application code. It may also be another,
more sophisticated, loader routine that adds a transmission protocol to enhance the integrity
16 MBytes 16 MBytes 16 MBytes
BSL mode active Yes (P0L.4=’0’) Yes (P0L.4=’0’) No (P0L.4=’1’)
EA pin High Low Access to application
Code fetch from
internal Flash area Test-Flash access Test-Flash access User Flash access
Data fetch from
internal Flash area User Flash access User Flash access User Flash access
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Internal Flash memory ST10F280
50/239 Doc ID 8673 Rev. 3
of the loaded code or data. It may also contain a code sequence to change the system
configuration and enable the bus interface to store the received data into external memory.
This process may go through several iterations or may directly execute the final application.
In all cases the ST10F280 will still run in BSL mode, that means with the watchdog timer
disabled and limited access to the internal Flash area.
All code fetches from the internal Flash area (00’0000h...00’7FFFh or 01’0000h...01’7FFFh,
if mapped to segment 1) are redirected to the special Boot-ROM. Data fetches access will
access the internal Boot-ROM of the ST10F280, if any is available, but will return undefined
data on ROMless devices.
5.6.4 Exiting bootstrap loader mode
In order to execute a program in normal mode, the BSL mode must be terminated first. The
ST10F280 exits BSL mode upon a software reset (ignores the level on P0L.4) or a hardware
reset (P0L.4 must be high). After a reset the ST10F280 will start executing from location
00’0000h of the internal Flash or the external memory, as programmed via pin EA.
5.6.5 Choosing the baud rate for the BSL
The calculation of the serial Baud rate for ASC0 from the length of the first zero Byte that is
received, allows the operation of the bootstrap loader of the ST10F280 with a wide range of
Baud rates. However, the upper and lower limits have to be kept, in order to insure proper
data transfer.
The ST10F280 uses timer T6 to measure the length of the initial zero Byte. The quantization
uncertainty of this measurement implies the first deviation from the real Baud rate, the next
deviation is implied by the computation of the S0BRL reload value from the timer contents.
The formula below shows the association:
For a correct data transfer from the host to the ST10F280 the maximum deviation between
the internal initialized Baud rate for ASC0 and the real Baud rate of the host should be below
2.5%. The deviation (FB, in percent) between host Baud rate and ST10F280 Baud rate can
be calculated via the formula below:
Note: Function (FB) does not consider the tolerances of oscillators and other devices supporting
the serial communication.
This Baud rate deviation is a nonlinear function depending on the CPU clock and the Baud
rate of the host. The maxima of the function (FB) increase with the host Baud rate due to the
BST10F280
fCPU
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ST10F280 Internal Flash memory
Doc ID 8673 Rev. 3 51/239
smaller Baud rate pre-scaler factors and the implied higher quantization error
(see Figure 8).
The minimum Baud rate (BLow in the Figure 8) is determined by the maximum count
capacity of timer T6, when measuring the zero Byte, and it depends on the CPU clock.
Using the maximum T6 count 216 in the formula the minimum Baud rate can be calculated.
The lowest standard Baud rate in this case would be 1200 Baud. Baud rates below BLow
would cause T6 to overflow. In this case ASC0 cannot be initialized properly.
The maximum Baud rate (BHigh in the Figure 8) is the highest Baud rate where the
deviation still does not exceed the limit, so all Baud rates between BLow and BHigh are below
the deviation limit. The maximum standard Baud rate that fulfills this requirement is 19200
Baud.
Higher Baud rates, however, may be used as long as the actual deviation does not exceed
the limit. A certain Baud rate (marked ’I’ in Figure 8) may violate the deviation limit, while an
even higher Baud rate (marked ’II’ in Figure 8) stays very well below it. This depends on the
host interface.
Figure 8. Baud rate deviation between host and ST10F280
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Central Processing Unit (CPU) ST10F280
52/239 Doc ID 8673 Rev. 3
6 Central Processing Unit (CPU)
The CPU includes a 4-stage instruction pipeline, a 16-bit arithmetic and logic unit (ALU) and
dedicated SFRs. Additional hardware has been added for a separate multiply and divide
unit, a bit-mask generator and a barrel shifter.
Most of the ST10F280’s instructions can be executed in one instruction cycle which requires
50ns at 40MHz CPU clock. For example, shift and rotate instructions are processed in one
instruction cycle independent of the number of bits to be shifted.
Multiple-cycle instructions have been optimized: branches are carried out in 2 cycles, 16 x
16 bit multiplication in 5 cycles and a 32/16 bit division in 10 cycles.
The jump cache reduces the execution time of repeatedly performed jumps in a loop, from
2 cycles to 1 cycle.
The CPU uses a bank of 16 word registers to run the current context. This bank of General
Purpose Registers (GPR) is physically stored within the on-chip Internal RAM (IRAM) area.
A Context Pointer (CP) register determines the base address of the active register bank to
be accessed by the CPU.
The number of register banks is only restricted by the available Internal RAM space. For
easy parameter passing, a register bank may overlap others.
A system stack of up to 1024 bytes is provided as a storage for temporary data. The system
stack is allocated in the on-chip RAM area, and it is accessed by the CPU via the stack
pointer (SP) register.
Two separate SFRs, STKOV and STKUN, are implicitly compared against the stack pointer
value upon each stack access for the detection of a stack overflow or underflow.
Figure 9. CPU block diagram (MAC unit not included)
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ST10F280 Central Processing Unit (CPU)
Doc ID 8673 Rev. 3 53/239
The system configuration register SYSCON
This bit-addressable register provides general system configuration and control functions.
The reset value for register SYSCON depends on the state of the PORT0 pins during reset.
SYSCON
Address: 0xFF12h / 89h SFR
Reset: 0x0XX0h
Type: R/W
1.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
STKSZ
ROMS1
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1. These bit are set directly or indirectly according to PORT0 and EA pin configuration during reset sequence.
Register SYSCON cannot be changed after execution of the EINIT instruction.
R/W(1) R/W R/W(1) R/W R/W R/W R/W R/W R/W R/W
XPEN XBUS Peripheral Enable Bit
0: Accesses to the on-chip X-Peripherals and their functions are disabled
1: The on-chip X-Peripherals are enabled and can be accessed.
BDRSTEN Bidirectional Reset Enable
0: RSTIN pin is an input pin only. SW Reset or WDT Reset have no effect on this pin
1: RSTIN pin is a bidirectional pin. This pin is pulled low during 1024 TCL during reset
sequence.
OWDDIS Oscillator Watchdog Disable Control
0: Oscillator Watchdog (OWD) is enabled. If PLL is bypassed, the OWD monitors
XTAL1 activity. If there is no activity on XTAL1 for at least 1 μs, the CPU clock is
switched automatically to PLL’s base frequency (2 to 10MHz).
1: OWD is disabled. If the PLL is bypassed, the CPU clock is always driven by XTAL1
signal. The PLL is turned off to reduce power supply current.
PWDCFG Power Down Mode Configuration Control
0: Power Down Mode can only be entered during PWRDN instruction execution if NMI
pin is low, otherwise the instruction has no effect. To exit Power Down Mode, an
external reset must occurs by asserting the RSTIN pin.
1: Power Down Mode can only be entered during PWRDN instruction execution if all
enabled fast external interrupt EXxIN pins are in their inactive level. Exiting this mode
can be done by asserting one enabled EXxIN pin.
CSCFG Chip Select Configuration Control
0: Latched Chip Select lines: CSx change 1 TCL after rising edge of ALE
1: Unlatched Chip Slect lines: CSx change with rising edge of ALE
Central Processing Unit (CPU) ST10F280
54/239 Doc ID 8673 Rev. 3
6.1 Multiplier-accumulator Unit (MAC)
The MAC co-processor is a specialized co-processor added to the ST10 CPU Core in order
to improve the performances of the ST10 Family in signal processing algorithms.
Signal processing needs at least three specialized units operating in parallel to achieve
maximum performance:
●A Multiply-Accumulate Unit,
●An Address Generation Unit, able to feed the MAC Unit with 2 operands per cycle,
●A Repeat Unit, to execute series of multiply-accumulate instructions.
The existing ST10 CPU has been modified to include new addressing capabilities which
enable the CPU to supply the new co-processor with up to 2 operands per instruction cycle.
This new co-processor (so-called MAC) contains a fast multiply-accumulate unit and a
repeat unit.
The co-processor instructions extend the ST10 CPU instruction set with multiply, multiply-
accumulate, 32-bit signed arithmetic operations.
A new transfer instruction CoMOV has also been added to take benefit of the new
addressing capabilities.
6.1.1 Features
Enhanced addressing capabilities
●New addressing modes including a double indirect addressing mode with pointer post-
modification.
●Parallel Data Move: this mechanism allows one operand move during Multiply-
Accumulate instructions without penalty.
●New transfer instructions CoSTORE (for fast access to the MAC SFRs) and CoMOV
(for fast memory to memory table transfer).
Multiply-accum ulate unit
●One-cycle execution for all MAC operations.
●16 x 16 signed/unsigned parallel multiplier.
●40-bit signed arithmetic unit with automatic saturation mode.
●40-bit accumulator.
●8-bit left/right shifter.
●Full instruction set with multiply and multiply-accumulate, 32-bit signed arithmetic and
compare instructions.
Program control
●Repeat Unit: allows some MAC co-processor instructions to be repeated up to 8192
times. Repeated instructions may be interrupted.
●MAC interrupt (Class B Trap) on MAC condition flags.
ST10F280 Central Processing Unit (CPU)
Doc ID 8673 Rev. 3 55/239
Figure 10. MAC unit architecture
6.2 Instruction set summary
The Tab le 4 lists the instructions of the ST10F280. The various addressing modes,
instruction operation, parameters for conditional execution of instructions, opcodes and a
detailed description of each instruction can be found in the “ST10 Family Programming
Manual”.
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Table 4. Instruction set summary
Mnemonic Description Bytes
ADD(B) Add word (byte) operands 2 / 4
ADDC(B) Add word (byte) operands with Carry 2 / 4
SUB(B) Subtract word (byte) operands 2 / 4
SUBC(B) Subtract word (byte) operands with Carry 2 / 4
MUL(U) (Un)Signed multiply direct GPR by direct GPR (16-16-bit) 2
DIV(U) (Un)Signed divide register MDL by direct GPR (16-/16-bit) 2
DIVL(U) (Un)Signed long divide reg. MD by direct GPR (32-/16-bit) 2
CPL(B) Complement direct word (byte) GPR 2
NEG(B) Negate direct word (byte) GPR 2
Central Processing Unit (CPU) ST10F280
56/239 Doc ID 8673 Rev. 3
AND(B) Bitwise AND, (word/byte operands) 2 / 4
OR(B) Bitwise OR, (word/byte operands) 2 / 4
XOR(B) Bitwise XOR, (word/byte operands) 2 / 4
BCLR Clear direct bit 2
BSET Set direct bit 2
BMOV(N) Move (negated) direct bit to direct bit 4
BAND, BOR, BXOR AND/OR/XOR direct bit with direct bit 4
BCMP Compare direct bit to direct bit 4
BFLDH/L Bitwise modify masked high/low byte of bit-addressable direct word
memory with immediate data 4
CMP(B) Compare word (byte) operands 2 / 4
CMPD1/2 Compare word data to GPR and decrement GPR by 1/2 2 / 4
CMPI1/2 Compare word data to GPR and increment GPR by 1/2 2 / 4
PRIOR Determine number of shift cycles to normalize direct word GPR and
store result in direct word GPR 2
SHL / SHR Shift left/right direct word GPR 2
ROL / ROR Rotate left/right direct word GPR 2
ASHR Arithmetic (sign bit) shift right direct word GPR 2
MOV(B) Move word (byte) data 2 / 4
MOVBS Move byte operand to word operand with sign extension 2 / 4
MOVBZ Move byte operand to word operand with zero extension 2 / 4
JMPA, JMPI, JMPR Jump absolute/indirect/relative if condition is met 4
JMPS Jump absolute to a code segment 4
J(N)B Jump relative if direct bit is (not) set 4
JBC Jump relative and clear bit if direct bit is set 4
JNBS Jump relative and set bit if direct bit is not set 4
CALLA, CALLI,
CALLR Call absolute/indirect/relative subroutine if condition is met 4
CALLS Call absolute subroutine in any code segment 4
PCALL Push direct word register onto system stack and call absolute
subroutine 4
TRAP Call interrupt service routine via immediate trap number 2
PUSH, POP Push/pop direct word register onto/from system stack 2
SCXT Push direct word register onto system stack and update register with
word operand 4
RET Return from intra-segment subroutine 2
Table 4. Instruction set summary (continued)
Mnemonic Description Bytes
ST10F280 Central Processing Unit (CPU)
Doc ID 8673 Rev. 3 57/239
6.3 MAC coprocessor specific instructions
The following table gives an overview of the MAC instruction set. All the mnemonics are
listed with the addressing modes that can be used with each instruction.
For each combination of mnemonic and addressing mode this table indicates if it is
repeatable or not
New addressing capabilities enable the CPU to supply the MAC with up to 2 operands per
instruction cycle. MAC instructions: multiply, multiply-accumulate, 32-bit signed arithmetic
operations and the CoMOV transfer instruction have been added to the standard instruction
set. Full details are provided in the ‘ST10 Family Programming Manual’. Double indirect
addressing requires two pointers. Any GPR can be used for one pointer, the other pointer is
provided by one of two specific SFRs IDX0 and IDX1. Two pairs of offset registers QR0/QR1
and QX0/QX1 are associated with each pointer (GPR or IDXi).
The GPR pointer allows access to the entire memory space, but IDXi are limited to the
internal Dual-Port RAM, except for the CoMOV instruction.
RETS Return from inter-segment subroutine 2
RETP Return from intra-segment subroutine and pop direct
word register from system stack 2
RETI Return from interrupt service subroutine 2
SRST Software Reset 4
IDLE Enter Idle Mode 4
PWRDN Enter Power Down Mode (supposes NMI-pin being low) 4
SRVWDT Service Watchdog Timer 4
DISWDT Disable Watchdog Timer 4
EINIT Signify End-of-Initialization on RSTOUT-pin 4
ATOMIC Begin ATOMIC sequence 2
EXTR Begin EXTended Register sequence 2
EXTP(R) Begin EXTended Page (and Register) sequence 2 / 4
EXTS(R) Begin EXTended Segment (and Register) sequence 2 / 4
NOP Null operation 2
Table 4. Instruction set summary (continued)
Mnemonic Description Bytes
Central Processing Unit (CPU) ST10F280
58/239 Doc ID 8673 Rev. 3
Table 5. MAC coprocesso r speci fic instruc ti ons
Mnemonic Addressing modes R epeatability
CoMUL
Rwn, Rwm
[IDXi⊗], [Rwm⊗]
Rwn, [Rwm⊗]
No
No
No
CoMULu
CoMULus
CoMULsu
CoMUL-
CoMULu-
CoMULus-
CoMULsu-
CoMUL, rnd
CoMULu, rnd
CoMULus, rnd
CoMULsu, rnd
CoMAC
Rwn, Rwm
[IDXi⊗], [Rwm⊗]
Rwn, [Rwm⊗]
No
Ye s
Ye s
CoMACu
CoMACus
CoMACsu
CoMAC-
CoMACu-
CoMACus-
CoMACsu-
CoMAC, rnd
CoMACu, rnd
CoMACus, rnd
CoMACsu, rnd
CoMACR
CoMACRu
CoMACRus
Rwn, Rwm
[IDXi⊗], [Rwn⊗]
Rwn, [RWm⊗]
No
No
No
CoMACRsu
CoMACR, rnd
CoMACRu, rnd
CoMACRus, rnd
CoMACRsu, rnd
CoNOP
[Rwm⊗] Ye s
[IDXi⊗]Yes
[IDXi⊗], [Rwm⊗] Ye s
ST10F280 Central Processing Unit (CPU)
Doc ID 8673 Rev. 3 59/239
CoNEG
-NoCoNEG, rnd
CoRND
CoSTORE Rwn, CoReg No
[Rwn⊗], Coreg Yes
CoMOV [IDXi⊗], [Rwm⊗] Ye s
CoMACM
[IDXi⊗], [Rwm⊗] Ye s
CoMACMu
CoMACMus
CoMACMsu
CoMACM-
CoMACMu-
CoMACMus-
CoMACMsu-
CoMACM, rnd
CoMACMu, rnd
CoMACMus, rnd
CoMACMsu, rnd
CoMACMR
CoMACMRu
CoMACMRus
CoMACMRsu
CoMACMR, rnd
CoMACMRu, rnd
CoMACMRus, rnd
CoMACMRsu, rnd
CoADD
Rwn, Rwm
[IDXi⊗], [Rwm⊗]
Rwn, [Rwm⊗]
No
Ye s
Ye s
CoADD2
CoSUB
CoSUB2
CoSUBR
CoSUB2R
CoMAX
CoMIN
Table 5. MAC coprocessor specific instructions (continued)
Mnemonic Addressing modes R epeatability
Central Processing Unit (CPU) ST10F280
60/239 Doc ID 8673 Rev. 3
The Tabl e 6 shows the various combinations of pointer post-modification for each of these 2
new addressing modes. In this document the symbols “[Rwn⊗]” and “[IDXi⊗]” refer to these
addressing modes.
CoLOAD
Rwn, Rwm
[IDXi⊗], [Rwm⊗]
Rwn, [Rwm⊗]
CoLOAD- No
CoLOAD2 No
CoLOAD2- No
CoCMP
CoSHL
Rwm
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[Rwm⊗]
Ye s
No
Ye s
CoSHR
CoASHR
CoASHR, rnd
CoABS
-
Rwn, Rwm
[IDXi⊗], [Rwm⊗]
Rwn, [Rwm⊗]
No
No
No
Table 6. Pointer post-modification combinations for IDXi and Rwn
Symbol Mnemonic Address pointer operation
“[IDXi⊗]” stands for
[IDXi](IDX
i) ← (IDXi) (no-op)
[IDXi+](IDX
i) ← (IDXi) +2 (i=0,1)
[IDXi](IDX
i) ← (IDXi)2 (i=0,1)
[IDXi + QXj](IDX
i) ← (IDXi) + (QXj) (i, j =0,1)
[IDXi QXj](IDX
i) ← (IDXi) (QXj) (i, j =0,1)
“[Rwn⊗]” stands for
[Rwn] (Rwn) ← (Rwn) (no-op)
[Rwn+] (Rwn) ← (Rwn) +2 (n=0-15)
[Rwn-] (Rwn) ← (Rwn)2 (k=0-15)
[Rwn+QRj] (Rwn) ← (Rwn) + (QRj) (n=0-15;j =0,1)
[Rwn QRj] (Rwn) ← (Rwn) (QRj) (n=0-15; j =0,1)
Table 7. MAC reg is ters ref er enced as ‘CoReg ‘
Registers Description Address in Opcode
MSW MAC-Unit Status Word 00000b
MAH MAC-Unit Accumulator High 00001b
MAS “limited” MAH /signed 00010b
Table 5. MAC coprocessor specific instructions (continued)
Mnemonic Addressing modes R epeatability
ST10F280 Central Processing Unit (CPU)
Doc ID 8673 Rev. 3 61/239
MAL MAC-Unit Accumulator Low 00100b
MCW MAC-Unit Control Word 00101b
MRW MAC-Unit Repeat Word 00110b
Table 7. MAC registers referenced as ‘CoReg‘ (continued)
Registers Description Address in Opcode
External bus controller ST10F280
62/239 Doc ID 8673 Rev. 3
7 External bus controller
All of the external memory accesses are performed by the on-chip external bus controller.
The EBC can be programmed to single chip mode when no external memory is required, or
to one of four different external memory access modes:
●16-/18-/20-/24-bit addresses 16-bit data, demultiplexed
●16-/18-/20-/24-bit addresses 16-bit data, multiplexed
●16-/18-/20-/24-bit addresses 8-bit data, multiplexed
●16-/18-/20-/24-bit addresses 8-bit data, demultiplexed
In demultiplexed bus modes addresses are output on PORT1 and data is input/output on
PORT0 or P0L, respectively. In the multiplexed bus modes both addresses and data use
PORT0 for input/output.
Timing characteristics of the external bus interface (memory cycle time, memory tri-state
time, length of ale and read write delay) are programmable giving the choice of a wide range
of memories and external peripherals.
Up to 4 independent address windows may be defined (using register pairs ADDRSELx /
BUSCONx) to access different resources and bus characteristics.
These address windows are arranged hierarchically where BUSCON4 overrides BUSCON3
and BUSCON2 overrides BUSCON1. All accesses to locations not covered by these 4
address windows are controlled by BUSCON0.
Up to 5 external CS signals (4 windows plus default) can be generated in order to save
external glue logic. Access to very slow memories is supported by a ‘Ready’ function.
A HOLD/HLDA protocol is available for bus arbitration which shares external resources with
other bus masters. The bus arbitration is enabled by setting bit HLDEN in register PSW.
After setting HLDEN once, pins P6.7...P6.5 (BREQ, HLDA, HOLD) are automatically
controlled by the EBC. In master mode (default after reset) the HLDA pin is an output.
By setting bit DP6.7 to’1’ the slave mode is selected where pin HLDA is switched to input.
This directly connects the slave controller to another master controller without glue logic.
For applications which require less external memory space, the address space can be
restricted to 1 MByte, 256 KByte or to 64 KByte. Port 4 outputs all 8 address lines if an
address space of 16 MBytes is used, otherwise four, two or no address lines.
Chip select timing can be made programmable. By default (after reset), the CSx lines
change half a CPU clock cycle after the rising edge of ALE. With the CSCFG bit set in the
SYSCON register the CSx lines change with the rising edge of ALE.
The active level of the READY pin can be set by bit RDYPOL in the BUSCONx registers.
When the READY function is enabled for a specific address window, each bus cycle within
the window must be terminated with the active level defined by bit RDYPOL in the
associated BUSCON register.
ST10F280 External bus controller
Doc ID 8673 Rev. 3 63/239
7.1 Programmable chip select timing control
The ST10F280 allows the user to adjust the position of the CSx lines changes. By default
(after reset), the CSx lines are changing half a CPU clock cycle (12.5 ns at fCPU = 40MHz)
after the rising edge of ALE.
With the CSCFG bit set in the SYSCON register, the CSx lines are changing with the rising
edge of ALE, thus the CSx lines are changing at the same time the address lines are
changing. See Section 19.2: System configuration registers for detailed description of
SYSCON register.
Figure 11. Chip select delay
7.2 READY programmable polarity
The active level of the READY pin can be selected by software via the RDYPOL bit in the
BUSCONx registers. When the READY function is enabled for a specific address window,
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64/239 Doc ID 8673 Rev. 3
each bus cycle within this window must be terminated with the active level defined by this
RDYPOL bit in the associated BUSCON register.
BUSCON0
Address: 0xFF0Ch / 86h SFR
Reset: 0x0XX0h
Type: R/W
BUSCON1
Address: 0xFF14h / 8Ah SFR
Reset: 0x0000h
Type: R/W
BUSCON2
Address: 0xFF16h / 8Bh SFR
Reset: 0x0000h
Type: R/W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
CSWEN0
CSREN0
RDYPOL0
RDYEN0
-
BUSACT0
ALECTL0
-BTYP
MTTC0
RWDC0
MCTC
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
1514131211109876543210
CSWEN1
CSREN1
RDYPOL1
RDYEN1
-
BUSACT1
ALECTL1
-BTYP
MTTC1
RWDC1
MCTC
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
CSWEN2
CSREN2
RDYPOL2
RDYEN2
-
BUSACT2
ALECTL2
-BTYP
MTTC2
RWDC2
MCTC
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
ST10F280 External bus controller
Doc ID 8673 Rev. 3 65/239
BUSCON3
Address: 0xFF18h / 8Ch SFR
Reset: 0x0000h
Type: R/W
BUSCON4
Address: 0xFF1Ah / 8Dh SFR
Reset: 0x0000h
Type: R/W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
CSWEN3
CSREN3
RDYPOL3
RDYEN3
-
BUSACT3
ALECTL3
-BTYP
MTTC3
RWDC3
MCTC
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
CSWEN4
CSREN4
RDYPOL4
RDYEN4
-
BUSACT4
ALECTL4
-BTYP
MTTC4
RWDC4
MCTC
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
RDYPOLx Ready Active Level Control
0: The active level on the READY pin is low, bus cycle terminates with a ‘0’ on READY pin,
1: The active level on the READY pin is high, bus cycle terminates with a ‘1’ on READY
pin.
Interrupt system ST10F280
66/239 Doc ID 8673 Rev. 3
8 Interrupt system
The interrupt response time for internal program execution is from 125ns to 300ns at 40MHz
CPU clock.
The ST10F280 architecture supports several mechanisms for fast and flexible response to
service requests that can be generated from various sources (internal or external) to the
microcontroller. Any of these interrupt requests can be serviced by the Interrupt Controller or
by the Peripheral Event Controller (PEC).
In contrast to a standard interrupt service where the current program execution is
suspended and a branch to the interrupt vector table is performed, just one cycle is ‘stolen’
from the current CPU activity to perform a PEC service. A PEC service implies a single Byte
or Word data transfer between any two memory locations with an additional increment of
either the PEC source or destination pointer. An individual PEC transfer counter is implicitly
decremented for each PEC service except when performing in the continuous transfer
mode. When this counter reaches zero, a standard interrupt is performed to the
corresponding source related vector location. PEC services are very well suited to perform
the transmission or the reception of blocks of data. The ST10F280 has 8 PEC channels,
each of them offers such fast interrupt-driven data transfer capabilities.
An interrupt control register which contains an interrupt request flag, an interrupt enable flag
and an interrupt priority bitfield is dedicated to each existing interrupt source. Thanks to its
related register, each source can be programmed to one of sixteen interrupt priority levels.
Once starting to be processed by the CPU, an interrupt service can only be interrupted by a
higher prioritized service request. For the standard interrupt processing, each of the
possible interrupt sources has a dedicated vector location.
Software interrupts are supported by means of the ‘TRAP’ instruction in combination with an
individual trap (interrupt) number.
ST10F280 Interru pt system
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8.1 External interrupts
Fast external interrupt inputs are provided to service external interrupts with high precision
requirements. These fast interrupt inputs feature programmable edge detection (rising edge,
falling edge or both edges).
Fast external interrupts may also have interrupt sources selected from other peripherals; for
example the CANx controller receive signal (CANx_RxD) can be used to interrupt the
system. This new function is controlled using the ‘External Interrupt Source Selection’
register EXISEL.
EXISEL
Address: 0xF1DAh / EDh ESFR
Reset: 0x0000h
Type: R/W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
EXI7SS EXI6SS EXI5SS EXI4SS EXI3SS EXI2SS EXI1SS EXI0SS
R/W R/W R/W R/W R/W R/W R/W R/W
EXIxSS External Interrupt x Source Selection (x=7...0)
‘00’: Input from associated Port 2 pin.
‘01’: Input from “alternate source”.
‘10’: Input from Port 2 pin ORed with “alternate source”.
‘11’: Input from Port 2 pin ANDed with “alternate source”.
EXIxSS Port 2 pin Alternate Source
0P2.8CAN1_RxD
1P2.9CAN2_RxD
2...7 P2.10...15 Not used (zero)
Interrupt system ST10F280
68/239 Doc ID 8673 Rev. 3
EXICON
E
Address: 0xF1C0h / E0h ESFR
Reset: 0x0000h
Type: R/W
8.2 Interrupt registers and vectors location list
Ta bl e 8 shows all the available ST10F280 interrupt sources and the corresponding
hardware-related interrupt flags, vectors, vector locations and trap (interrupt) numbers:
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
EXI7ES EXI6ES EXI5ES EXI4ES EXI3ES EXI2ES EXI1ES EXI0ES
R/W R/W R/W R/W R/W R/W R/W R/W
EXIxES(x=7...0) External Interrupt x Edge Selection Field (x=7...0)
00: Fast external interrupts disabled: standard mode
EXxIN pin not taken in account for entering/exiting Power Down mode.
01: Interrupt on positive edge (rising)
Enter Power Down mode if EXiIN = ‘0’, exit if EXxIN = ‘1’ (referred as ‘high’ active
level)
10: Interrupt on negative edge (falling)
Enter Power Down mode if EXiIN = ‘1’, exit if EXxIN = ‘0’ (referred as ‘low’ active
level)
11: Interrupt on any edge (rising or falling)
Always enter Power Down mode, exit if EXxIN level changed.
Table 8. Interrupt sources
Source of Interrupt or
PEC service request Request
flag Enable
flag Interrupt
vector Vector
location Trap
number
CAPCOM Register 0 CC0IR CC0IE CC0INT 00’0040h 10h
CAPCOM Register 1 CC1IR CC1IE CC1INT 00’0044h 11h
CAPCOM Register 2 CC2IR CC2IE CC2INT 00’0048h 12h
CAPCOM Register 3 CC3IR CC3IE CC3INT 00’004Ch 13h
CAPCOM Register 4 CC4IR CC4IE CC4INT 00’0050h 14h
CAPCOM Register 5 CC5IR CC5IE CC5INT 00’0054h 15h
CAPCOM Register 6 CC6IR CC6IE CC6INT 00’0058h 16h
CAPCOM Register 7 CC7IR CC7IE CC7INT 00’005Ch 17h
CAPCOM Register 8 CC8IR CC8IE CC8INT 00’0060h 18h
CAPCOM Register 9 CC9IR CC9IE CC9INT 00’0064h 19h
CAPCOM Register 10 CC10IR CC10IE CC10INT 00’0068h 1Ah
CAPCOM Register 11 CC11IR CC11IE CC11INT 00’006Ch 1Bh
CAPCOM Register 12 CC12IR CC12IE CC12INT 00’0070h 1Ch
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Doc ID 8673 Rev. 3 69/239
CAPCOM Register 13 CC13IR CC13IE CC13INT 00’0074h 1Dh
CAPCOM Register 14 CC14IR CC14IE CC14INT 00’0078h 1Eh
CAPCOM Register 15 CC15IR CC15IE CC15INT 00’007Ch 1Fh
CAPCOM Register 16 CC16IR CC16IE CC16INT 00’00C0h 30h
CAPCOM Register 17 CC17IR CC17IE CC17INT 00’00C4h 31h
CAPCOM Register 18 CC18IR CC18IE CC18INT 00’00C8h 32h
CAPCOM Register 19 CC19IR CC19IE CC19INT 00’00CCh 33h
CAPCOM Register 20 CC20IR CC20IE CC20INT 00’00D0h 34h
CAPCOM Register 21 CC21IR CC21IE CC21INT 00’00D4h 35h
CAPCOM Register 22 CC22IR CC22IE CC22INT 00’00D8h 36h
CAPCOM Register 23 CC23IR CC23IE CC23INT 00’00DCh 37h
CAPCOM Register 24 CC24IR CC24IE CC24INT 00’00E0h 38h
CAPCOM Register 25 CC25IR CC25IE CC25INT 00’00E4h 39h
CAPCOM Register 26 CC26IR CC26IE CC26INT 00’00E8h 3Ah
CAPCOM Register 27 CC27IR CC27IE CC27INT 00’00ECh 3Bh
CAPCOM Register 28 CC28IR CC28IE CC28INT 00’00F0h 3Ch
CAPCOM Register 29 CC29IR CC29IE CC29INT 00’0110h 44h
CAPCOM Register 30 CC30IR CC30IE CC30INT 00’0114h 45h
CAPCOM Register 31 CC31IR CC31IE CC31INT 00’0118h 46h
CAPCOM Timer 0 T0IR T0IE T0INT 00’0080h 20h
CAPCOM Timer 1 T1IR T1IE T1INT 00’0084h 21h
CAPCOM Timer 7 T7IR T7IE T7INT 00’00F4h 3Dh
CAPCOM Timer 8 T8IR T8IE T8INT 00’00F8h 3Eh
GPT1 Timer 2 T2IR T2IE T2INT 00’0088h 22h
GPT1 Timer 3 T3IR T3IE T3INT 00’008Ch 23h
GPT1 Timer 4 T4IR T4IE T4INT 00’0090h 24h
GPT2 Timer 5 T5IR T5IE T5INT 00’0094h 25h
GPT2 Timer 6 T6IR T6IE T6INT 00’0098h 26h
GPT2 CAPREL Register CRIR CRIE CRINT 00’009Ch 27h
A/D Conversion
Complete ADCIR ADCIE ADCINT 00’00A0h 28h
A/D Overrun Error ADEIR ADEIE ADEINT 00’00A4h 29h
ASC0 Transmit S0TIR S0TIE S0TINT 00’00A8h 2Ah
ASC0 Transmit Buffer S0TBIR S0TBIE S0TBINT 00’011Ch 47h
Table 8. Interrupt sources (contin ued)
Source of Interrupt or
PEC service request Request
flag Enable
flag Interrupt
vector Vector
location Trap
number
Interrupt system ST10F280
70/239 Doc ID 8673 Rev. 3
CAPCOM Register 13 CC13IR CC13IE CC13INT 00’0074h 1Dh
CAPCOM Register 14 CC14IR CC14IE CC14INT 00’0078h 1Eh
CAPCOM Register 15 CC15IR CC15IE CC15INT 00’007Ch 1Fh
CAPCOM Register 16 CC16IR CC16IE CC16INT 00’00C0h 30h
CAPCOM Register 17 CC17IR CC17IE CC17INT 00’00C4h 31h
CAPCOM Register 18 CC18IR CC18IE CC18INT 00’00C8h 32h
CAPCOM Register 19 CC19IR CC19IE CC19INT 00’00CCh 33h
CAPCOM Register 20 CC20IR CC20IE CC20INT 00’00D0h 34h
CAPCOM Register 21 CC21IR CC21IE CC21INT 00’00D4h 35h
CAPCOM Register 22 CC22IR CC22IE CC22INT 00’00D8h 36h
CAPCOM Register 23 CC23IR CC23IE CC23INT 00’00DCh 37h
CAPCOM Register 24 CC24IR CC24IE CC24INT 00’00E0h 38h
CAPCOM Register 25 CC25IR CC25IE CC25INT 00’00E4h 39h
CAPCOM Register 26 CC26IR CC26IE CC26INT 00’00E8h 3Ah
CAPCOM Register 27 CC27IR CC27IE CC27INT 00’00ECh 3Bh
CAPCOM Register 28 CC28IR CC28IE CC28INT 00’00F0h 3Ch
CAPCOM Register 29 CC29IR CC29IE CC29INT 00’0110h 44h
CAPCOM Register 30 CC30IR CC30IE CC30INT 00’0114h 45h
CAPCOM Register 31 CC31IR CC31IE CC31INT 00’0118h 46h
CAPCOM Timer 0 T0IR T0IE T0INT 00’0080h 20h
CAPCOM Timer 1 T1IR T1IE T1INT 00’0084h 21h
CAPCOM Timer 7 T7IR T7IE T7INT 00’00F4h 3Dh
CAPCOM Timer 8 T8IR T8IE T8INT 00’00F8h 3Eh
GPT1 Timer 2 T2IR T2IE T2INT 00’0088h 22h
GPT1 Timer 3 T3IR T3IE T3INT 00’008Ch 23h
GPT1 Timer 4 T4IR T4IE T4INT 00’0090h 24h
GPT2 Timer 5 T5IR T5IE T5INT 00’0094h 25h
GPT2 Timer 6 T6IR T6IE T6INT 00’0098h 26h
GPT2 CAPREL Register CRIR CRIE CRINT 00’009Ch 27h
A/D Conversion
Complete ADCIR ADCIE ADCINT 00’00A0h 28h
A/D Overrun Error ADEIR ADEIE ADEINT 00’00A4h 29h
ASC0 Transmit S0TIR S0TIE S0TINT 00’00A8h 2Ah
ASC0 Transmit Buffer S0TBIR S0TBIE S0TBINT 00’011Ch 47h
Table 8. Interrupt sources (contin ued)
Source of Interrupt or
PEC service request Request
flag Enable
flag Interrupt
vector Vector
location Trap
number
ST10F280 Interru pt system
Doc ID 8673 Rev. 3 71/239
CAPCOM Register 13 CC13IR CC13IE CC13INT 00’0074h 1Dh
CAPCOM Register 14 CC14IR CC14IE CC14INT 00’0078h 1Eh
CAPCOM Register 15 CC15IR CC15IE CC15INT 00’007Ch 1Fh
CAPCOM Register 16 CC16IR CC16IE CC16INT 00’00C0h 30h
CAPCOM Register 17 CC17IR CC17IE CC17INT 00’00C4h 31h
CAPCOM Register 18 CC18IR CC18IE CC18INT 00’00C8h 32h
CAPCOM Register 19 CC19IR CC19IE CC19INT 00’00CCh 33h
CAPCOM Register 20 CC20IR CC20IE CC20INT 00’00D0h 34h
CAPCOM Register 21 CC21IR CC21IE CC21INT 00’00D4h 35h
CAPCOM Register 22 CC22IR CC22IE CC22INT 00’00D8h 36h
CAPCOM Register 23 CC23IR CC23IE CC23INT 00’00DCh 37h
CAPCOM Register 24 CC24IR CC24IE CC24INT 00’00E0h 38h
CAPCOM Register 25 CC25IR CC25IE CC25INT 00’00E4h 39h
CAPCOM Register 26 CC26IR CC26IE CC26INT 00’00E8h 3Ah
CAPCOM Register 27 CC27IR CC27IE CC27INT 00’00ECh 3Bh
CAPCOM Register 28 CC28IR CC28IE CC28INT 00’00F0h 3Ch
CAPCOM Register 29 CC29IR CC29IE CC29INT 00’0110h 44h
CAPCOM Register 30 CC30IR CC30IE CC30INT 00’0114h 45h
CAPCOM Register 31 CC31IR CC31IE CC31INT 00’0118h 46h
CAPCOM Timer 0 T0IR T0IE T0INT 00’0080h 20h
CAPCOM Timer 1 T1IR T1IE T1INT 00’0084h 21h
CAPCOM Timer 7 T7IR T7IE T7INT 00’00F4h 3Dh
CAPCOM Timer 8 T8IR T8IE T8INT 00’00F8h 3Eh
GPT1 Timer 2 T2IR T2IE T2INT 00’0088h 22h
GPT1 Timer 3 T3IR T3IE T3INT 00’008Ch 23h
GPT1 Timer 4 T4IR T4IE T4INT 00’0090h 24h
GPT2 Timer 5 T5IR T5IE T5INT 00’0094h 25h
GPT2 Timer 6 T6IR T6IE T6INT 00’0098h 26h
GPT2 CAPREL Register CRIR CRIE CRINT 00’009Ch 27h
A/D Conversion
Complete ADCIR ADCIE ADCINT 00’00A0h 28h
A/D Overrun Error ADEIR ADEIE ADEINT 00’00A4h 29h
ASC0 Transmit S0TIR S0TIE S0TINT 00’00A8h 2Ah
ASC0 Transmit Buffer S0TBIR S0TBIE S0TBINT 00’011Ch 47h
Table 8. Interrupt sources (contin ued)
Source of Interrupt or
PEC service request Request
flag Enable
flag Interrupt
vector Vector
location Trap
number
Interrupt system ST10F280
72/239 Doc ID 8673 Rev. 3
Hardware traps are exceptions or error conditions that arise during run-time. They cause
immediate non-maskable system reaction similar to a standard interrupt service (branching
to a dedicated vector table location).
The occurrence of a hardware trap is additionally signified by an individual bit in the trap flag
register (TFR). Except when another higher prioritized trap service is in progress, a
hardware trap will interrupt any other program execution. Hardware trap services cannot not
be interrupted by standard interrupt or by PEC interrupts.
8.3 Interrupt Control Registers
All interrupt control registers are identically organized. The lower 8 bit of an interrupt control
register contain the complete interrupt status information of the associated source, which is
required during one round of prioritization, the upper 8 bit of the respective register are
reserved. All interrupt control registers are bit-addressable and all bit can be read or written
via software.
This allows each interrupt source to be programmed or modified with just one instruction.
When accessing interrupt control registers through instructions which operate on Word data
types, their upper 8 bit (15...8) will return zeros, when read, and will discard written data.
The layout of the Interrupt Control registers shown below applies to each xxIC register,
where xx stands for the mnemonic for the respective source.
ASC0 Receive S0RIR S0RIE S0RINT 00’00ACh 2Bh
ASC0 Error S0EIR S0EIE S0EINT 00’00B0h 2Ch
SSC Transmit SCTIR SCTIE SCTINT 00’00B4h 2Dh
SSC Receive SCRIR SCRIE SCRINT 00’00B8h 2Eh
SSC Error SCEIR SCEIE SCEINT 00’00BCh 2Fh
PWM Channel 0...3 PWMIR PWMIE PWMINT 00’00FCh 3Fh
CAN1 Interface XP0IR XP0IE XP0INT 00’0100h 40h
CAN2 Interface XP1IR XP1IE XP1INT 00’0104h 41h
XPWM XP2IR XP2IE XP2INT 00’0108h 42h
PLL Unlock/OWD XP3IR XP3IE XP3INT 00’010Ch 43h
Table 8. Interrupt sources (contin ued)
Source of Interrupt or
PEC service request Request
flag Enable
flag Interrupt
vector Vector
location Trap
number
ST10F280 Interru pt system
Doc ID 8673 Rev. 3 73/239
xxIC
Address: 0xyyyyh / zzh SFR area
Reset: 0x--00h
Type: R/W
8.4 Exception and error traps list
Ta bl e 9 shows all of the possible exceptions or error conditions that can arise during run-
time:
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
--------xxIRxxIE ILVL GLVL
R/W R/W R/W R/W
GLVL Group Level
Defines the internal order for simultaneous requests of the same priority.
11: Highest group priority
00: Lowest group priority
ILVL Interrupt Priority Level
Defines the priority level for the arbitration of requests.
Fh: Highest priority level
0h: Lowest priority level
xxIE Interrupt Enable Control Bit (individually enables/disables a specific source)
0: Interrupt Request is disabled
1: Interrupt Request is enabled
xxIR Interrupt Request Flag
0: No request pending
1: This source has raised an interrupt request
Interrupt system ST10F280
74/239 Doc ID 8673 Rev. 3
Table 9. Exceptions or error conditions that c an arise during run-time
Exception condition Trap flag Trap vector Vector location Trap number Trap priority(1)
Reset Functions MAXIMUM
Hardware Reset RESET 00’0000h 00h III
Software Reset RESET 00’0000h 00h III
Watchdog Timer Overflow RESET 00’0000h 00h III
Class A Hardware Traps
Non-Maskable Interrupt NMI NMITRAP 00’0008h 02h II
Stack Overflow STKOF STOTRAP 00’0010h 04h II
Stack Underflow STKUF STUTRAP 00’0018h 06h II
Class B Hardware Traps
Undefined Opcode UNDOPC BTRAP 00’0028h 0Ah I
Protected Instruction Fault PRTFLT BTRAP 00’0028h 0Ah I
Illegal Word Operand Access ILLOPA BTRAP 00’0028h 0Ah I
Illegal Instruction Access ILLINA BTRAP 00’0028h 0Ah I
Illegal External Bus Access ILLBUS BTRAP 00’0028h 0Ah I
MAC Trap MACTRP BTRAP 00’0028h 0Ah I
MINIMUM
Reserved [2Ch –3Ch] [0Bh – 0Fh]
Software Traps TRAP
Instruction
Any [00’0000h–
00’01FCh]
in steps of 4h
Any [00h – 7Fh] Current CPU
Priority
1. All the class B traps have the same trap number (and vector) and the same lower priority compare to the class A traps and
to the resets.
Each class A traps has a dedicated trap number (and vector). They are prioritized in the second priority level.
The resets have the highest priority level and the same trap number.
The PSW.ILVL CPU priority is forced to the highest level (15) when these exceptions are serviced
ST10F280 Capture/Compare (CAPCOM) units
Doc ID 8673 Rev. 3 75/239
9 Capture/Compare (CAPCOM) units
The ST10F280 has two 16 channels CAPCOM units as described in Figure 12. These
support generation and control of timing sequences on up to 32 channels with a maximum
resolution of 200ns at 40MHz CPU clock. The CAPCOM units are typically used to handle
high speed I/O tasks such as pulse and waveform generation, pulse width modulation
(PMW), Digital to Analog (D/A) conversion, software timing, or time recording relative to
external events.
Four 16-bit timers (T0/T1, T7/T8) with reload registers provide two independent time bases
for the capture/compare register array (See Figure 13 and Figure 14).
The input clock for the timers is programmable to several prescaled values of the internal
system clock, or may be derived from an overflow/underflow of timer T6 in module GPT2.
This provides a wide range of variation for the timer period and resolution and allows precise
adjustments to application specific requirements. In addition, external count inputs for
CAPCOM timers T0 and T7 allow event scheduling for the capture/compare registers
relative to external events.
Each of the two capture/compare register arrays contain 16 dual purpose capture/compare
registers, each of which may be individually allocated to either CAPCOM timer T0 or T1 (T7
or T8, respectively), and programmed for capture or compare functions. Each of the 32
registers has one associated port pin which serves as an input pin for triggering the capture
function, or as an output pin to indicate the occurrence of a compare event. Figure 12 shows
the basic structure of the two CAPCOM units.
Figure 12. CAPCOM unit block diagram
0IN
4X
)NPUT
#ONTROL
N
N
'044IMER4
0IN
4X).
#05
#LOCK
-ODE
#ONTROL
#APTURE
OR
#OMPARE
#APTUREINPUTS
#OMPAREOUTPUTS
0IN
4Y
)NPUT
#ONTROL
N
N
'044IMER4
/VER5NDERFLOW
#05
#LOCK
2ELOAD2EGISTER4X2%,
#!0#/-4IMER4X
)NTERRUPT
2EQUEST
3IXTEENBIT
#APTURE#OMPARE
2EGISTERS
/VER5NDERFLOW
#!0#/-4IMER4Y
2ELOAD2EGISTER4Y 2%,
#APTURE#OMPARE
)NTERRUPT2EQUESTS
)NTERRUPT
2EQUEST
X
Y
("1($'5
Capture/Compare (CAPCOM) units ST10F280
76/239 Doc ID 8673 Rev. 3
Note: The CAPCOM2 unit provides 16 capture inputs, but only 12 compare outputs. CC24I to
CC27I are inputs only.
Figure 13. Block diagram of CAPCOM timers T0 and T7
Figure 14. Block diagram of CAPCOM timers T1 and T
Note: When an external input signal is connected to the input lines of both T0 and T7, these timers
count the input signal synchronously. Thus the two timers can be regarded as one timer
whose contents can be compared with 32 capture registers.
When a capture/compare register has been selected for capture mode, the current contents
of the allocated timer will be latched (captured) into the capture/compare register in
response to an external event at the port pin which is associated with this register. In
addition, a specific interrupt request for this capture/compare register is generated.
Either a positive, a negative, or both a positive and a negative external signal transition at
the pin can be selected as the triggering event. The contents of all registers which have
been selected for one of the five compare modes are continuously compared with the
contents of the allocated timers.
When a match occurs between the timer value and the value in a capture /compare register,
specific actions will be taken based on the selected compare mode (see Ta bl e ).
0IN
8
4XL
#05
#LOCK
4X2
-58
'044IMER4
/VER5NDERFLOW
%DGE3ELECT
4X).
4XL
4XL 4X-
)NPUT
#ONTROL
2ELOAD2EGISTER4X2%,
#!0#/-4IMER4X 4X)2 )NTERRUPT
2EQUEST
X
("1($'5
8
4XL
#05
#LOCK
4X2
-58
'044IMER4
/VER5NDERFLOW
4X-
2ELOAD2EGISTER4X2%,
#!0#/-4IMER4X 4X)2 )NTERRUPT
2EQUEST
X
("1($'5
ST10F280 Capture/Compare (CAPCOM) units
Doc ID 8673 Rev. 3 77/239
The input frequencies fTx, for the timer input selector Tx, are determined as a function of the
CPU clocks. The timer input frequencies, resolution and periods which result from the
selected pre-scaler option in TxI when using a 40MHz CPU clock are listed in the Ta ble 1 1 .
The numbers for the timer periods are based on a reload value of 0000h. Note that some
numbers may be rounded to 3 significant figures.
Table 10. Compare modes
Compare modes Function
Mode 0 Interrupt-only compare mode; several compare interrupts per timer
period are possible
Mode 1 Pin toggles on each compare match; several compare events per timer
period are possible
Mode 2 Interrupt-only compare mode; only one compare interrupt per timer
period is generated
Mode 3 Pin set ‘1’ on match; pin reset ‘0’ on compare time overflow; only one
compare event per timer period is generated
Double Register Mode Two registers operate on one pin; pin toggles on each compare match;
several compare events per timer period are possible.
Table 11. CAPCOM timer input frequencies, resolution and periods
fCPU = 40MHz Timer input selection TxI
000b 001b 010b 011b 100b 101b 110b 111b
Pre-scaler for fCPU 8 16 32 64 128 256 512 1024
Input Frequency 5MHz 2.5MHz 1.25MHz 625kHz 312.5kHz 156.25kHz 78.125kHz 39.1kHz
Resolution 200ns 400ns 0.8µs 1.6µs 3.2µs 6.4µs 12.8µs 25.6µs
Period 13.1ms 26.2ms 52.4ms 104.8ms 209.7ms 419.4ms 838.9ms 1.678s
General purpose timer unit ST10F280
78/239 Doc ID 8673 Rev. 3
10 General purpose timer unit
The GPT unit is a flexible multifunctional timer/counter structure which is used for time
related tasks such as event timing and counting, pulse width and duty cycle measurements,
pulse generation, or pulse multiplication. The GPT unit contains five 16-bit timers organized
into two separate modules GPT1 and GPT2. Each timer in each module may operate
independently in several different modes, or may be concatenated with another timer of the
same module.
10.1 GPT1
Each of the three timers T2, T3, T4 of the GPT1 module can be configured individually for
one of four basic modes of operation: timer, gated timer, counter mode and incremental
interface mode.
In timer mode, the input clock for a timer is derived from the CPU clock, divided by a
programmable prescaler.
In counter mode, the timer is clocked in reference to external events.
Pulse width or duty cycle measurement is supported in gated timer mode where the
operation of a timer is controlled by the ‘gate’ level on an external input pin. For these
purposes, each timer has one associated port pin (TxIN) which serves as gate or clock
input.
Ta bl e 1 2 lists the timer input frequencies, resolution and periods for each pre-scaler option
at 40MHz CPU clock. This also applies to the Gated Timer Mode of T3 and to the auxiliary
timers T2 and T4 in Timer and Gated Timer Mode. The count direction (up/down) for each
timer is programmable by software or may be altered dynamically by an external signal on a
port pin (TxEUD).
In Incremental Interface Mode, the GPT1 timers (T2, T3, T4) can be directly connected to
the incremental position sensor signals A and B by their respective inputs TxIN and TxEUD.
Direction and count signals are internally derived from these two input signals so that the
contents of the respective timer Tx corresponds to the sensor position. The third position
sensor signal TOP0 can be connected to an interrupt input.
Timer T3 has output toggle latches (TxOTL) which changes state on each timer over flow /
underflow. The state of this latch may be output on port pins (TxOUT) for time out monitoring
of external hardware components, or may be used internally to clock timers T2 and T4 for
high resolution of long duration measurements.
In addition to their basic operating modes, timers T2 and T4 may be configured as reload or
capture registers for timer T3. When used as capture or reload registers, timers T2 and T4
are stopped. The contents of timer T3 is captured into T2 or T4 in response to a signal at
their associated input pins (TxIN).
Timer T3 is reloaded with the contents of T2 or T4 triggered either by an external signal or
by a selectable state transition of its toggle latch T3OTL. When both T2 and T4 are
configured to alternately reload T3 on opposite state transitions of T3OTL with the low and
high times of a PWM signal, this signal can be constantly generated without software
intervention.
ST10F280 General purpose timer unit
Doc ID 8673 Rev. 3 79/239
Figure 15. Block diagram of GPT1
10.2 GPT2
The GPT2 module provides precise event control and time measurement. It includes two
timers (T5, T6) and a capture/reload register (CAPREL). Both timers can be clocked with an
input clock which is derived from the CPU clock via a programmable prescaler or with
external signals. The count direction (up/down) for each timer is programmable by software
or may additionally be altered dynamically by an external signal on a port pin (TxEUD).
Concatenation of the timers is supported via the output toggle latch (T6OTL) of timer T6
which changes its state on each timer overflow/underflow.
The state of this latch may be used to clock timer T5, or it may be output on a port pin
(T6OUT). The overflow / underflow of timer T6 can additionally be used to clock the
CAPCOM timers T0 or T1, and to cause a reload from the CAPREL register. The CAPREL
register may capture the contents of timer T5 based on an external signal transition on the
corresponding port pin (CAPIN), and timer T5 may optionally be cleared after the capture
procedure. This allows absolute time differences to be measured or pulse multiplication to
be performed without software overhead.
Table 12. GPT1 timer input frequencies, resolution and periods
fCPU = 40MHz Timer input selection T2I / T3I / T4I
000b 001b 010b 011b 100b 101b 110b 111b
Pre-scaler factor 8 16 32 64 128 256 512 1024
Input Freq 5MHz 2.5MHz 1.25MHz 625kHz 312.5kHz 156.25kHz 78.125kHz 39.1kHz
Resolution 200ns 400ns 0.8µs 1.6µs 3.2µs 6.4µs 12.8µs 25.6µs
Period maximum 13.1ms 26.2ms 52.4ms 104.8ms 209.7ms 419.4ms 838.9ms 1.678s
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80/239 Doc ID 8673 Rev. 3
The capture trigger (timer T5 to CAPREL) may also be generated upon transitions of GPT1
timer T3 inputs T3IN and/or T3EUD. This is advantageous when T3 operates in Incremental
Interface Mode.
Ta bl e 1 3 lists the timer input frequencies, resolution and periods for each pre-scaler option
at 40MHz CPU clock. This also applies to the Gated Timer Mode of T6 and to the auxiliary
timer T5 in Timer and Gated Timer Mode.
Figure 16. Block diagram of GPT2
Table 13. GPT2 timer input frequencies, resolution and period
fCPU = 40MHz Timer input selection T5I / T6I
000b 001b 010b 011b 100b 101b 110b 111b
Pre-scaler factor 4 8 16 32 64 128 256 512
Input Freq 10MHz 5MHz 2.5MHz 1.25MHz 625kHz 312.5kHz 156.25kHz 78.125kHz
Resolution 100ns 200ns 400ns 0.8µs 1.6µs 3.2µs 6.4µs 12.8µs
Period maximum 6.55ms 13.1ms 26.2ms 52.4ms 104.8ms 209.7ms 419.4ms 838.9ms
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ST10F280 PWM module
Doc ID 8673 Rev. 3 81/239
11 PWM module
11.1 Standard PWM module
The pulse width modulation module can generate up to four PWM output signals using
edge-aligned or centre-aligned PWM. In addition, the PWM module can generate PWM
burst signals and single shot outputs. The Ta b le 1 4 shows the PWM frequencies for different
resolutions.
The level of the output signals is selectable and the PWM module can generate interrupt
requests.
Figure 17. Block diagram of PWM module
11.2 New PWM module: XPWM
The new Pulse Width Modulation (XPWM) Module of the ST10F280 is mapped on the
XBUS interface (Address range 00’EC00h-00’ECFFh) and allows the generation of up to 4
independent PWM signals.The XPWM is enabled by setting XPEN bit 2 of the SYSCON
register and bit 4 of the new XPERCON register. The frequency range of these XPWM
signals for a 40MHz CPU clock is from 9.6Hz up to 20MHz for edge aligned signals. For
center aligned signals the frequency range is 4.8Hz up to 10MHz (see detailed description).
The minimum values depend on the width (16 bit) and the resolution (CLK/1 or CLK/64) of
Table 14. PWM unit frequencies and resolution at 40MHz CPU clock
Mode 0 Resolution 8-bit 10-bit 12-bit 14-bit 16-bit
CPU Clock/1 25ns 156.25kHz 39.06kHz 9.77kHz 2.44Hz 610.35Hz
CPU Clock/64 1.6μs 2.44Hz 610.35Hz 152.58Hz 38.15Hz 9.54Hz
Mode 1 Resolution 8-bit 10-bit 12-bit 14-bit 16-bit
CPU Clock/1 25ns 78.12kHz 19.53kHz 4.88kHz 1.22kHz 305.17Hz
CPU Clock/64 1.6μs 1.22kHz 305.17Hz 76.29Hz 19.07Hz 4.77Hz
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the XPWM timers. The maximum values assume that the XPWM output signal changes with
every cycle of the respective timer. In a real application the maximum XPWM frequency will
depend on the required resolution of the XPWM output signal (see Figure 18).
The Pulse Width Modulation Module consists of 4 independent PWM channels. Each
channel has a 16-bit up/down counter XPTx, a 16-bit period register XPPx with a shadow
latch, a 16-bit pulse width register XPWx with a shadow latch, two comparators, and the
necessary control logic. The operation of all four channels is controlled by two common
control registers, XPWMCON0 and XPWMCON1, and the interrupt control and status is
handled by one interrupt control register XP2IC, which is also common for all channels (see
Figure 11.2.1).
Figure 18. SFRs and port pins associated with the XPWM module
Figure 19. XPWM channel block diagram
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11.2.1 Operating modes
The XPWM module provides four different operating modes:
●Mode 0 Standard PWM generation (edge aligned PWM) available on all four channels
●Mode 1 Symmetrical PWM generation (center aligned PWM) available on all four
channels
●Burst mode combines channels 0 and 1
●Single shot mode available on channels 2 and 3
Note: The output signals of the XPWM module are XORed with the outputs of the respective bits
of XPOLAR register. After reset these bits are cleared, so the PWM signals are directly
driven to the output pins. By setting the respective bits of XPOLAR register to ‘1’ the PWM
signal may be inverted (XORed with ‘1’) before being driven to the output pin. The
descriptions below refer to the standard case after reset, i.e. direct driving.
Mode 0: standard PWM generation (edge aligned PWM)
Mode 0 is selected by clearing the respective bit XPMx in register XPWMCON1 to ‘0’. In this
mode the timer XPTx of the respective XPWM channel is always counting up until it reaches
the value in the associated period shadow register. Upon the next count pulse the timer is
reset to 0000h and continues counting up with subsequent count pulses. The XPWM output
signal is switched to high level when the timer contents are equal to or greater than the
contents of the pulse width shadow register. The signal is switched back to low level when
the respective timer is reset to 0000h, i.e. below the pulse width shadow register. The period
of the resulting PWM signal is determined by the value of the respective XPPx shadow
register plus 1, counted in units of the timer resolution.
PWM_PeriodMode0 = [XPPx] + 1
The duty cycle of the XPWM output signal is controlled by the value in the respective pulse
width shadow register. This mechanism allows the selection of duty cycles from 0% to 100%
including the boundaries. For a value of 0000h the output will remain at a high level,
representing a duty cycle of 100%. For a value higher than the value in the period register
the output will remain at a low level, which corresponds to a duty cycle of 0%.
The Figure 20 illustrates the operation and output waveforms of a XPWM channel in mode 0
for different values in the pulse width register.
This mode is referred to as Edge Aligned PWM, because the value in the pulse width
(shadow) register only effects the positive edge of the output signal. The negative edge is
always fixed and related to the clearing of the timer.
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Figure 20. Operation and output waveform in mode 0
Mode 1: symmetrical PWM generation (center aligned PWM)
Mode 1 is selected by setting the respective bit XPMx in register XPWMCON1 to ‘1’. In this
mode the timer XPTx of the respective XPWM channel is counting up until it reaches the
value in the associated period shadow register.
Upon the next count pulse the count direction is reversed and the timer starts counting down
now with subsequent count pulses until it reaches the value 0000H. Upon the next count
pulse the count direction is reversed again and the count cycle is repeated with the following
count pulses.
The XPWM output signal is switched to a high level when the timer contents are equal to or
greater than the contents of the pulse width shadow register while the timer is counting up.
The signal is switched back to a low level when the respective timer has counted down to a
value below the contents of the pulse width shadow register. So in mode 1 this PWM value
controls both edges of the output signal.
Note that in mode 1 the period of the PWM signal is twice the period of the timer:
PWM_PeriodMode1 = 2 * ([XPPx] + 1)
The figure below illustrates the operation and output waveforms of a XPWM channel in
mode 1 for different values in the pulse width register.
This mode is referred to as Center Aligned PWM, because the value in the pulse width
(shadow) register effects both edges of the output signal symmetrically.
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Figure 21. Operation and output waveform in mode 1
Burst mode
Burst mode is selected by setting bit PB01 in register XPWMCON1 to ‘1’. This mode
combines the signals from XPWM channels 0 and 1 onto the port pin of channel 0. The
output of channel 0 is replaced with the logical AND of channels 0 and 1. The output of
channel 1 can still be used at its associated output pin (if enabled).
Each of the two channels can either operate in mode 0 or 1.
Note: It is guaranteed by design, that no spurious spikes will occur at the output pin of channel 0 in
this mode. The output of the AND gate will be transferred to the output pin synchronously to
internal clocks.
XORing of the PWM signal and the port output latch value is done after the ANDing of
channel 0 and 1.
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Figure 22. Operation and output waveform in burst mode
Single shot mode
Single shot mode is selected by setting the respective bit PSx in register XPWMCON1 to ‘1’.
This mode is available for XPWM channels 2 and 3.
In this mode the timer XPTx of the respective XPWM channel is started via software and is
counting up until it reaches the value in the associated period shadow register. Upon the
next count pulse the timer is cleared to 0000h and stopped via hardware, i.e. the respective
PTRx bit is cleared. The XPWM output signal is switched to high level when the timer
contents are equal to or greater than the contents of the pulse width shadow register. The
signal is switched back to low level when the respective timer is cleared, i.e. is below the
pulse width shadow register. Thus starting a XPWM timer in single shot mode produces one
single pulse on the respective port pin, provided that the pulse width value is between 0000h
and the period value. In order to generate a further pulse, the timer has to be started again
via software by setting bit PTRx (see Figure 23).
After starting the timer (i.e. PTRx = ‘1’) the output pulse may be modified via software.
Writing to timer XPTx changes the positive and/or negative edge of the output signal,
depending on whether the pulse has already started (i.e. the output is high) or not (i.e. the
output is still low). This (multiple) re-triggering is always possible while the timer is running,
i.e. after the pulse has started and before the timer is stopped.
Loading counter XPTx directly with the value in the respective XPPx shadow register will
abort the current PWM pulse upon the next clock pulse (counter is cleared and stopped by
hardware).
By setting the period (XPPx), the timer start value (XPTx) and the pulse width value (XPWx)
appropriately, the pulse width (tw) and the optional pulse delay (td) may be varied in a wide
range.
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Figure 23. Operation and output waveform in single shot mode
11.2.2 XPWM module registers
The XPWM module is controlled via two sets of registers. The waveforms are selected by
the channel specific registers XPTx (timer), XPPx (period) and XPWx (pulse width).
Three common registers control the operating modes and the general functions
(XPWMCON0 and XPWMCON1) of the PWM module as well as the interrupt behavior
(XP2IC).
Up/down counters XPTx
Each counter XPTx of a PWM channel is clocked either directly by the CPU clock or by the
CPU clock divided by 64. Bit PTIx in register XPWMCON0 selects the respective clock
source. A XPWM counter counts up or down (controlled by hardware), while its respective
run control bit PTRx is set. A timer is started (PTRx = ’1’) via software and is stopped (PTRx
= ’0’) either via hardware or software, depending on its operating mode. Control bit PTRx
enables or disables the clock input of counter XPTx rather than controlling the XPWM output
signal.
Note: For the register locations please refer to the Ta b le 1 5 .
Ta bl e 1 6 summarizes the XPWM frequencies that result from various combinations of
operating mode, counter resolution (input clock) and pulse width resolution.
Period registers XPPx
The 16-bit period register XPPx of a XPWM channel determines the period of a PWM cycle,
i.e. the frequency of the PWM signal. This register is buffered with a shadow register. The
shadow register is loaded from the respective XPPx register at the beginning of every new
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PWM cycle, or upon a write access to XPPx, while the timer is stopped. The CPU accesses
the XPPx register while the hardware compares the contents of the shadow register with the
contents of the associated counter XPTx. When a match is found between counter and
XPPx shadow register, the counter is either reset to 0000h, or the count direction is switched
from counting up to counting down, depending on the selected operating mode of that
XPWM channel. For the register locations refer to the Ta bl e 1 5 .
Pulse width registers XPWx
This 16-bit register holds the actual PWM pulse width value which corresponds to the duty
cycle of the PWM signal. This register is buffered with a shadow register. The CPU
accesses the XPWx register while the hardware compares the contents of the shadow
register with the contents of the associated counter XPTx. The shadow register is loaded
from the respective XPWx register at the beginning of every new PWM cycle, or upon a
write access to XPWx, while the timer is stopped.When the counter value is greater than or
equal to the shadow register value, the PWM signal is set, otherwise it is reset. The output
of the comparators may be described by the boolean formula:
PWM output signal = [XPTx] ≥ [XPWx shadow latch].
This type of comparison allows a flexible control of the PWM signal. For the register
locations refer to the Ta bl e 1 5 .
Table 15. XPWM module channel specific register addresses
Register Address Register Address
XPW0 EC30h XPT0 EC10h
XPW1 EC32h XPT1 EC12h
XPW2 EC34h XPT2 EC14h
XPW3 EC36h XPT3 EC16h
These registers are not bit-addressable.
XPP0 EC20h
XPP1 EC22h
XPP2 EC24h
XPP3 EC26h
Table 16. XPWM frequency
Mode 0 Resolution 8-bit 10-bit 12-bit 14-bit 16-bit
CPU Clock/1 25ns 156.25kHz 39.06kHz 9.77kHz 2.44Hz 610.35Hz
CPU Clock/64 1.6μs 2.44Hz 610.35Hz 152.58Hz 38.15Hz 9.54Hz
Mode 1 Resolution 8-bit 10-bit 12-bit 14-bit 16-bit
CPU Clock/1 25ns 78.12kHz 19.53kHz 4.88kHz 1.22kHz 305.17Hz
CPU Clock/64 1.6μs 1.22kHz 305.17Hz 76.29Hz 19.07Hz 4.77Hz
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11.2.3 XPWM Control Registers
XPWMCON0
Address: 0xEC00h
Reset: 0x0000h
Type: R/W
Register XPWMCON0 controls the function of the timers of the four XPWM channels and
the channel specific interrupts. Having the control bits organized in functional groups allows
e.g. to start or stop all 4 XPWM timers simultaneously with one bitfield instruction. Note:
This register is not bit-addressable.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
PIR3 PIR2 PIR1 PIR0 PIE3 PIE2 PIE1 PIE0 PTI3 PTI2 PTI1 PTI0 PTR3 PTR2 PTR1 PTR0
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
PTRx XPWM Timer x Run Control Bit
0: Timer XPTx is disconnected from its input clock
1: Timer XPTx is running
PTIx XPWM Timer x Input Clock Selection
0: Timer XPTx clocked with CLKCPU
1: TimerX PTx clocked with CLKCPU / 64
PIEx XPWM Channel x Interrupt Enable Flag
0: Interrupt from channel x disabled
1: Interrupt from channel x enabled
PIRx XPWM Channel x Interrupt Request Flag
0: No interrupt request from channel x
1: Channel x interrupt pending (must be reset via software)
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XPWMCON1
Address: 0xEC02h
Reset: 0x0000h
Type: R/W
Register XPWMCON1 controls the operating modes and the outputs of the four XPWM
channels. The basic operating mode for each channel (standard = edge aligned, or
symmetrical = center aligned PWM mode) is selected by the mode bits XPMx. Burst mode
(channels 0 and 1) and single shot mode (channel 2 or 3) are selected by separate control
bits. The output signal of each XPWM channel is individually enabled by bit PENx. If the
output is not enabled the respective pin can only be used to generate an interrupt request.
Note: This register is not bit-addressable.
11.2.4 Interrupt request generation
Each of the four channels of the XPWM module can generate an individual interrupt
request. Each of these “channel interrupts” can activate the common “module interrupt”,
which actually interrupts the CPU. This common module interrupt is controlled by the XPWM
Module Interrupt Control register XP2IC(Xperipherals 2 control register). The interrupt
service routine can determine the active channel interrupt(s) from the channel specific
interrupt request flags PIRx in register XPWMCON0. The interrupt request flag PIRx of a
channel is set at the beginning of a new PWM cycle, i.e. upon loading the shadow registers.
This indicates that registers XPPx and XPWx are now ready to receive a new value. If a
channel interrupt is enabled via its respective PIEx bit, also the common interrupt request
flag XP2IR in register XP2IC is set, provided that it is enabled via the common interrupt
enable bit XP2IE.
Note: The channel interrupt request flags (PIRx in register XPWMCON0) are not automatically
cleared by hardware upon entry into the interrupt service routine, so they must be cleared
via software. The module interrupt request flag XP2IR is cleared by hardware upon entry
into the service routine, regardless of how many channel interrupts were active. However, it
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
PS3 PS2 - PB01 - - - - PM3 PM2 PM1 PM0 PEN3 PEN2 PEN1 PEN0
R/W R/W - R/W - - - - R/W R/W R/W R/W R/W R/W R/W R/W
PENx XPWM Channel x Output Enable Bit
0: Channel x output signal disabled, generate interrupt only
1: Channel x output signal enabled
PMx XPWM Channel x Mode Control Bit
0: Channel x operates in mode 0, edge aligned PWM
1: Channel x operates in mode 1, center aligned PWM
PB01 XPWM Channel 0/1 Burst Mode Control Bit
0: Channels 0 and 1 work independently in respective standard mode
1: Outputs of channels 0 and 1 are ANDed to XPWM0 in burst mode
PSx XPWM Channel x Single Shot Mode Control Bit
0: Channel x works in respective standard mode
1: Channel x operates in single shot mode
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Doc ID 8673 Rev. 3 91/239
will be set again if during execution of the service routine a new channel interrupt request is
generated.
XP2IC
Address: 0xF196h / CBh ESFR
Reset: 0x--00h
Type: R/W
Note: Refer to the general Interrupt Control Register description for an explanation of the control
fields.
11.2.5 XPWM output signals
The output signals of the four XPWM channels are XPWM3...XPWM0. The output signal of
each PWM channel is individually enabled by control bit PENx in register XPWMCON1.
The XPWM signals are XORed with the outputs of the register XPOLAR(3...0) before being
driven to the output pins. This allows driving the XPWM signal directly to the output pin
(XPOLAR.x=’0’) or driving the inverted XPWM signal (XPOLAR.x=’1’).
Figure 24. XPWM output signal generation
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11.2.6 XPOLAR Register (polarity of the XPWM channel)
XPOLAR
Address: 0xEC04h
Reset: 0x0000h
Type: R/W
Software control of the XPWM outputs
In an application the XPWM output signals are generally controlled by the XPWM module.
However, it may be necessary to influence the level of the XPWM output pins via software
either to initialize the system or to react on some extraordinary condition, e.g. a system fault
or an emergency.
Clearing the timer run bit PTRx stops the associated counter and leaves the respective
output at its current level.
The individual XPWM channel outputs are controlled by comparators according to the
formula:
●PWM output signal = [PTx] ≥ [PWx shadow latch].
So whenever software changes registers XPTx, the respective output will reflect the
condition after the change. Loading timer XPTx with a value greater than or equal to the
value in XPWx immediately sets the respective output, a XPTx value below the XPWx value
clears the respective output.
Note: To prevent further PWM pulses from occurring after such a software intervention the
respective counter must be stopped first.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
- - - - - - - - - - - - XPOLAR.3 XPOLAR.2 XPOLAR.1 XPOLAR.0
R/W R/W R/W R/W
XPOLAR.x XPOLAR Channel x polarity Bit
0: Polarity of Channel x is normal
1: Polarity of Channel x is inverted
ST10F280 Parallel ports
Doc ID 8673 Rev. 3 93/239
12 Parallel ports
In order to accept or generate single external control signals or parallel data, the ST10F280
provides up to 143 parallel I/O lines, organized into two 16-bit I/O port (Port 2, XPort9), eight
8-bit I/O ports (PORT0 made of P0H and P0L, PORT1 made of P1H and P1L, Port 4, Port 6,
Port 7, Port 8), one 15-bit I/O port (Port 3) and two 16-bit input port (Port 5, XPort10).
These port lines may be used for general purpose Input/Output, controlled via software, or
may be used implicitly by ST10F280’s integrated peripherals or the External Bus Controller.
All port lines are bit addressable, and all input/output lines are individually (bit-wise)
programmable as inputs or outputs via direction registers (except Port 5, XPort10). The I/O
ports are true bidirectional ports which are switched to high impedance state when
configured as inputs. The output drivers of seven I/O ports (2, 3, 4, 6, 7, 8, 9) can be
configured (pin by pin) for push/pull operation or open-drain operation via ODPx control
registers.
The output driver of the pads are programmable to adapt the edge characteristics to the
application requirement and to improve the EMI behaviour.
This is possible using the POCONx registers for Ports P0L, P0H, P1L, P1H, P2, P3, P4, P6,
P7, P8. The output driver capabilities of ALE, RD and WR control lines are programmable
with the dedicated bits of POCON20 control register.
The input threshold levels are programmable (TTL/CMOS) for five ports (2, 3, 4, 7, 8) with
the PICON register control bits. The logic level of a pin is clocked into the input latch once
per state time, regardless whether the port is configured for input or output.
A write operation to a port pin configured as an input causes the value to be written into the
port output latch, while a read operation returns the latched state of the pin itself. A read-
modify-write operation reads the value of the pin, modifies it, and writes it back to the output
latch.
Writing to a pin configured as an output (DPx.y=‘1’) causes the output latch and the pin to
have the written value, since the output buffer is enabled. Reading this pin returns the value
of the output latch. A read-modify-write operation reads the value of the output latch,
modifies it, and writes it back to the output latch, thus also modifying the level at the pin.
Note: The new I/O ports (XPort9, XPort10) are not mapped on the SFR space but on the internal
XBUS interface. The XPort9 and XPort10 are enabled by setting XPEN bit 2 of the SYSCON
register and bit 3 of the new XPERCON register. On the XBUS interface, the registers are
not bit-addressable.
Parallel ports ST10F280
94/239 Doc ID 8673 Rev. 3
Figure 25. SFRs associated with the parallel ports
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ST10F280 Parallel ports
Doc ID 8673 Rev. 3 95/239
Figure 26. XBUS registers associated with the parallel ports
12.1 Introduction
12.1.1 Open drain mode
In the ST10F280 some ports provide Open Drain Control. This makes it possible to switch
the output driver of a port pin from a push/pull configuration to an open drain configuration.
In push/pull mode a port output driver has an upper and a lower transistor, thus it can
actively drive the line either to a high or a low level. In open drain mode the upper transistor
is always switched off, and the output driver can only actively drive the line to a low level.
When writing a ‘1’ to the port latch, the lower transistor is switched off and the output enters
a high-impedance state. The high level must then be provided by an external pull-up device.
With this feature, it is possible to connect several port pins together to a Wired-AND
configuration, saving external glue logic and/or additional software overhead for
enabling/disabling output signals.
This feature is implemented for ports P2, P3, P4, P6, P7 and P8 (see respective sections),
and is controlled through the respective Open Drain Control Registers ODPx. These
registers allow the individual bit-wise selection of the open drain mode for each port line. If
the respective control bit ODPx.y is ‘0’ (default after reset), the output driver is in the
push/pull mode. If ODPx.y is ‘1’, the open drain configuration is selected. Note that all ODPx
registers are located in the ESFR space.
Figure 27. Output drivers in push/pull mode and in open drain mode
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Parallel ports ST10F280
96/239 Doc ID 8673 Rev. 3
12.1.2 Input threshold control
The standard inputs of the ST10F280 determine the status of input signals according to TTL
levels. In order to accept and recognize noisy signals, CMOS-like input thresholds can be
selected instead of the standard TTL thresholds for all pins of Port 2, Port 3, Port4, Port 7
and Port 8. These special thresholds are defined above the TTL thresholds and feature a
defined hysteresis to prevent the inputs from toggling while the respective input signal level
is near the thresholds.
The Port Input Control register PICON is used to select these thresholds for each byte of the
indicated ports, i.e. the 8-bit ports P7 and P8 are controlled by one bit each while ports P2
and P3 are controlled by two bits each.
PICON
Address: 0xF1C4h / E2h ESFR
Reset: 0x--00h
Type: R/W
All options for individual direction and output mode control are available for each pin,
independent of the selected input threshold. The input hysteresis provides stable inputs
from noisy or slowly changing external signals.
Figure 28. Hysteresis for special input thresholds
12.1.3 Output driver control
The port output control registers POCONx allow to select the port output driver
characteristics of a port. The aim of these selections is to adapt the output drivers to the
application’s requirements, and to improve the EMI behaviour of the device. Two
characteristics may be selected:
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
- - - - - - - - P8LIN P7LIN - P4LIN P3HIN P3LIN P2HIN P2LIN
R/W R/W R/W R/W R/W R/W R/W R/W
PxLIN Port x Low Byte Input Level Selection
0: Pins Px.7...Px.0 switch on standard TTL input levels
1: Pins Px.7...Px.0 switch on special threshold input levels
PxHIN Port x High Byte Input Level Selection
0: Pins Px.15...Px.8 switch on standard TTL input levels
1: Pins Px.15...Px.8 switch on special threshold input levels
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ST10F280 Parallel ports
Doc ID 8673 Rev. 3 97/239
Edge characteristic defines the rise/fall time for the respective output, ie. the transition time.
Slow edge reduce the peak currents that are sinked/sourced when changing the voltage
level of an external capacitive load. For a bus interface or pins that are changing at
frequency higher than 1MHz, however, fast edges may still be required.
Driver characteristic defines either the general driving capability of the respective driver, or if
the driver strength is reduced after the target output level has been reached or not.
Reducing the driver strength increases the output’s internal resistance, which attenuates
noise that is imported via the output line. For driving LEDs or power transistors, however, a
stable high output current may still be required.
For each feature, a 2-bit control field (ie. 4 bits) is provided for each group of 4 port pads (ie.
a port nibble), in port output control registers POCONx.
POCONx
Address: 0xF0yyh / zzh for 8-bit Ports ESFR
Reset: 0x--00h
Type: R/W
POCONx
Address: 0xF0yyh / zzh for 16-bit Ports ESFR
Reset: 0x0000h
Type: R/W
Note: In case of reading an 8 bit P0CONX register, high Byte (bit 15..8) is read as 00h.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
-------- PN1DC PN1EC PN0DC PN0EC
R/W R/W R/W R/W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
PN3DC PN3EC PN2DC PN2EC PN1DC PN1EC PN0DC PN0EC
R/W R/W R/W R/W R/W R/W R/W R/W
PNxEC Port Nibble x Edge Characteristic (rise/fall time)
00: Fast edge mode, rise/fall times depend on the driver’s dimensioning.
01: Slow edge mode, rise/fall times ~60 ns
10: Reserved
11: Reserved
PNxDC Port Nibble x Driver Characteristic (output current)
00: High Current mode: Driver always operates with maximum strength.
01: Dynamic Current mode: Driver strength is reduced after the target level has been
reached.
10: Low Current mode: Driver always operates with reduced strength.
11: Reserved
Parallel ports ST10F280
98/239 Doc ID 8673 Rev. 3
Port control register allocation
The table below lists the defined POCON registers and the allocation of control bitfields and
port pins:
Dedicated pins output cont rol
Programmable pad drivers also are supported for the dedicated pins ALE, RD and WR. For
these pads, a special POCON20 register is provided.
POCON20
Address: 0xF0AAh / 5h ESFR
Reset: 0x0000h
Type: R/W
Table 17. POCON registers
Control
register Physical
address 8-Bit
address Controlled port
POCON0L F080h 40h P0L.7...4 P0L.3...0
POCON0H F082h 41h P0H.7...4 P0H.3...0
POCON1L F084h 42h P1L.7...4 P1L.3...0
POCON1H F086h 43h P1H.7...4 P1H.3...0
POCON2 F088h 44h P2.15...12 P2.11...8 P2.7...4 P2.3...0
POCON3 F08Ah 45h P3.15,
P3.13...12 P3.11...8 P3.7...4 P3.3...0
POCON4 F08Ch 46h P4.7...4 P4.3...0
POCON6 F08Eh 47h P6.7...4 P6.3...0
POCON7 F090h 48h P7.7...4 P7.3...0
POCON8 F092h 49h P8.7...4 P8.3...0
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
-------- PN1DC PN1EC PN0DC PN0EC
R/W R/W R/W R/W
PN0EC RD, WR Edge Characteristic (rise/fall time)
00: Fast edge mode, rise/fall times depend on the driver’s dimensioning.
01: Slow edge mode, rise/fall times ~60 ns
10: Reserved
11: Reserved
PN0DC RD, WR Driver Characteristic (output current)
00: High Current mode: Driver always operates with maximum strength.
01: Dynamic Current mode: Driver strength is reduced after the target level has been
reached.
10: Low Current mode: Driver always operates with reduced strength.
11: Reserved
ST10F280 Parallel ports
Doc ID 8673 Rev. 3 99/239
12.1.4 Alternate port functions
Each port line has one associated programmable alternate input or output function. PORT0
and PORT1 may be used as the address and data lines when accessing external memory.
Port 4 outputs the additional segment address bits A23/A19/A18/A16 in systems where
more than 64 KBytes of memory are to be accessed directly.
Port 6 provides the optional chip select outputs and the bus arbitration lines.
Port 2, Port 7 and Port 8 are associated with the capture inputs or compare outputs of the
CAPCOM units and/or with the outputs of the PWM module.
Port 2 is also used for fast external interrupt inputs and for timer 7 input.
Port 3 includes alternate input/output functions of timers, serial interfaces, the optional bus
control signal BHE/WRH and the system clock output (CLKOUT).
Port 5 is used for the analog input channels to the A/D converter or timer control signals.
If an alternate output function of a pin is to be used, the direction of this pin must be
programmed for output (DPx.y=‘1’), except for some signals that are used directly after reset
and are configured automatically. Otherwise the pin remains in the high-impedance state
and is not effected by the alternate output function. The respective port latch should hold a
‘1’, because its output is ANDed with the alternate output data (except for PWM output
signals).
If an alternate input function of a pin is used, the direction of the pin must be programmed
for input (DPx.y=‘0’) if an external device is driving the pin. The input direction is the default
after reset. If no external device is connected to the pin, however, one can also set the
direction for this pin to output. In this case, the pin reflects the state of the port output latch.
Thus, the alternate input function reads the value stored in the port output latch. This can be
used for testing purposes to allow a software trigger of an alternate input function by writing
to the port output latch.
On most of the port lines, the user software is responsible for setting the proper direction
when using an alternate input or output function of a pin. This is done by setting or clearing
the direction control bit DPx.y of the pin before enabling the alternate function. There are
port lines, however, where the direction of the port line is switched automatically. For
instance, in the multiplexed external bus modes of PORT0, the direction must be switched
several times for an instruction fetch in order to output the addresses and to input the data.
Obviously, this cannot be done through instructions. In these cases, the direction of the port
line is switched automatically by hardware if the alternate function of such a pin is enabled.
PN1EC ALE Edge Characteristic (rise/fall time)
00: Fast edge mode, rise/fall times depend on the driver’s dimensioning.
01: Slow edge mode, rise/fall times ~60 ns
10: Reserved
11: Reserved
PN1DC ALE Driver Characteristic (output current)
00: High Current mode: Driver always operates with maximum strength.
01: Dynamic Current mode: Driver strength is reduced after the target level has been
reached.
10: Low Current mode: Driver always operates with reduced strength.
11: Reserved
Parallel ports ST10F280
100/239 Doc ID 8673 Rev. 3
To determine the appropriate level of the port output latches check how the alternate data
output is combined with the respective port latch output.
There is one basic structure for all port lines with only an alternate input function. Port lines
with only an alternate output function, however, have different structures due to the way the
direction of the pin is switched and depending on whether the pin is accessible by the user
software or not in the alternate function mode.
All port lines that are not used for these alternate functions may be used as general purpose
I/O lines. When using port pins for general purpose output, the initial output value should be
written to the port latch prior to enabling the output drivers, in order to avoid undesired
transitions on the output pins. This applies to single pins as well as to pin groups (see
examples below).
SINGLE_BIT: BSET P4.7 ; Initial output level is "high"
BSET DP4.7 ; Switch on the output driver
BIT_GROUP: BFLDH P4, #24H, #24H ; Initial output level is "high"
BFLDH DP4, #24H, #24H ; Switch on the output drivers
Note: When using several BSET pairs to control more pins of one port, these pairs must be
separated by instructions, which do not reference the respective port (see “Particular
Pipeline Effects” in Chapter 6: Central Processing Unit (CPU)).
12.2 Port 0
The two 8-bit ports P0H and P0L represent the higher and lower part of PORT0,
respectively. Both halves of PORT0 can be written (e.g. via a PEC transfer) without effecting
the other half.
If this port is used for general purpose I/O, the direction of each line can be configured via
the corresponding direction registers DP0H and DP0L.
ST10F280 Parallel ports
Doc ID 8673 Rev. 3 101/239
P0L
Address: 0xFF00h / 80h SFR
Reset: 0x--00h
Type: R/W
P0H
Address: 0xFF020h / 81h SFR
Reset: 0x--00h
Type: R/W
DP0L
Address: 0xF100h / 80h ESFR
Reset: 0x--00h
Type: R/W
DP0H
Address: 0xF102h / 81h ESFR
Reset: 0x--00h
Type: R/W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
- - - - - - - - P0L.7 P0L.6 P0L.5 P0L.4 P0L.3 P0L.2 P0L.1 P0L.0
R/W R/W R/W R/W R/W R/W R/W R/W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
--------P0H.7P0H.6P0H.5P0H.4P0H.3P0H.2P0H.1P0H.0
R/W R/W R/W R/W R/W R/W R/W R/W
P0X.y Port data register P0H or P0L bit y
1514131211109876543210
--------DP0L.7DP0L.6DP0L.5DP0L.4DP0L.3DP0L.2DP0L.1DP0L.0
R/W R/W R/W R/W R/W R/W R/W R/W
1514131211109876543210
--------DP0H.7DP0H.6DP0H.5DP0H.4DP0H.3DP0H.2DP0H.1DP0H.0
R/W R/W R/W R/W R/W R/W R/W R/W
DP0X.y Port direction register DP0H or DP0L bit y
DP0X.y = 0: Port line P0X.y is an input (high-impedance)
DP0X.y = 1: Port line P0X.y is an output
Parallel ports ST10F280
102/239 Doc ID 8673 Rev. 3
12.2.1 Alternate functions of Port 0
When an external bus is enabled, PORT0 is used as data bus or address/data bus.
Note that an external 8-bit de-multiplexed bus only uses P0L, while P0H is free for I/O
(provided that no other bus mode is enabled).
PORT0 is also used to select the system start-up configuration. During reset, PORT0 is
configured to input, and each line is held high through an internal pull-up device. Each line
can now be individually pulled to a low level (see DC-level specifications) through an
external pull-down device. A default configuration is selected when the respective PORT0
lines are at a high level. Through pulling individual lines to a low level, this default can be
changed according to the needs of the applications.
The internal pull-up devices are designed such that an external pull-down resistors can be
used to apply a correct low level. These external pull-down resistors can remain connected
to the PORT0 pins also during normal operation, however, care has to be taken such that
they do not disturb the normal function of PORT0 (this might be the case, for example, if the
external resistor is too strong). With the end of reset, the selected bus configuration will be
written to the BUSCON0 register. The configuration of the high byte of PORT0, will be
copied into the special register RP0H. This read-only register holds the selection for the
number of chip selects and segment addresses. Software can read this register in order to
react according to the selected configuration, if required. When the reset is terminated, the
internal pull-up devices are switched off, and PORT0 will be switched to the appropriate
operating mode.
During external accesses in multiplexed bus modes PORT0 first outputs the 16-bit intra-
segment address as an alternate output function. PORT0 is then switched to high-
impedance input mode to read the incoming instruction or data. In 8-bit data bus mode, two
memory cycles are required for word accesses, the first for the low byte and the second for
the high byte of the word. During write cycles PORT0 outputs the data byte or word after
outputting the address. During external accesses in de-multiplexed bus modes PORT0
reads the incoming instruction or data word or outputs the data byte or word.
Figure 29. Port 0 I/O and alternate functi ons
When an external bus mode is enabled, the direction of the port pin and the loading of data
into the port output latch are controlled by the bus controller hardware.
The input of the port output latch is disconnected from the internal bus and is switched to the
line labeled “Alternate Data Output” via a multiplexer. The alternate data can be the 16-bit
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ST10F280 Parallel ports
Doc ID 8673 Rev. 3 103/239
intra-segment address or the 8/16-bit data information. The incoming data on PORT0 is
read on the line “Alternate Data Input”. While an external bus mode is enabled, the user
software should not write to the port output latch, otherwise unpredictable results may occur.
When the external bus modes are disabled, the contents of the direction register last written
by the user becomes active.
The Figure 30 shows the structure of a PORT0 pin.
Figure 30. Block diagram of a Port 0 pin
12.3 Port 1
The two 8-bit ports P1H and P1L represent the higher and lower part of PORT1,
respectively. Both halves of PORT1 can be written (e.g. via a PEC transfer) without effecting
the other half.
If this port is used for general purpose I/O, the direction of each line can be configured via
the corresponding direction registers DP1H and DP1L.
P1L
Address: 0xFF04h / 82h SFR
Reset: 0x--00h
Type: R/W
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- - - - - - - - P1L.7 P1L.6 P1L.5 P1L.4 P1L.3 P1L.2 P1L.1 P1L.0
R/W R/W R/W R/W R/W R/W R/W R/W
Parallel ports ST10F280
104/239 Doc ID 8673 Rev. 3
P1H
Address: 0xFF06h / 83h SFR
Reset: 0x--00h
Type: R/W
DP1L
Address: 0xF104h / 82h ESFR
Reset: 0x--00h
Type: R/W
DP1H
Address: 0xF106h / 83h ESFR
Reset: 0x--00h
Type: R/W
12.3.1 Alternate functions of Port 1
When a de-multiplexed external bus is enabled, PORT1 is used as address bus.
Note that de-multiplexed bus modes use PORT1 as a 16-bit port. Otherwise all 16 port lines
can be used for general purpose I/O.
The upper four pins of PORT1 (P1H.7...P1H.4) also serve as capture input lines for the
CAPCOM2 unit (CC27IO...CC24IO).
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
--------P1H.7P1H.6P1H.5P1H.4P1L.3P1H.2P1H.1P1H.0
R/W R/W R/W R/W R/W R/W R/W R/W
P1X.y Port data register P1H or P1L bit y
1514131211109876543210
--------DP1L.7DP1L.6DP1L.5DP1L.4DP1L.3DP1L.2DP1L.1DP1L.0
R/W R/W R/W R/W R/W R/W R/W R/W
1514131211109876543210
--------
DP1H.7
DP1H.6
DP1H.5
DP1H.4
DP1H.3
DP1H.2
DP1H.1
DP1H.0
R/W R/W R/W R/W R/W R/W R/W R/W
DP1X.y Port direction register DP1H or DP1L bit y
DP1X.y = 0: Port line P1X.y is an input (high-impedance)
DP1X.y = 1: Port line P1X.y is an output
ST10F280 Parallel ports
Doc ID 8673 Rev. 3 105/239
As all other capture inputs, the capture input function of pins P1H.7...P1H.4 can also be
used as external interrupt inputs (200 ns sample rate at 40MHz CPU clock).
During external accesses in de-multiplexed bus modes PORT1 outputs the 16-bit intra-
segment address as an alternate output function.
During external accesses in multiplexed bus modes, when no BUSCON register selects a
de-multiplexed bus mode, PORT1 is not used and is available for general purpose I/O (see
Figure 31).
When an external bus mode is enabled, the direction of the port pin and the loading of data
into the port output latch are controlled by the bus controller hardware. The input of the port
output latch is disconnected from the internal bus and is switched to the line labeled
“Alternate Data Output” via a multiplexer. The alternate data is the 16-bit intra-segment
address.
While an external bus mode is enabled, the user software should not write to the port output
latch, otherwise unpredictable results may occur. When the external bus modes are
disabled, the contents of the direction register last written by the user becomes active.
Figure 31. Port 1 I/O and alternate functi ons
The figure below shows the structure of a PORT1 pin.
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106/239 Doc ID 8673 Rev. 3
Figure 32. Block diagram of a Port 1 pin
12.4 Port 2
If this 16-bit port is used for general purpose I/O, the direction of each line can be configured
via the corresponding direction register DP2. Each port line can be switched into push/pull
or open drain mode via the open drain control register ODP2.
P2
Address: 0xFFC0h / E0h SFR
Reset: 0x0000h
Type: R/W
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R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
P2.y Port data register P2 bit y
ST10F280 Parallel ports
Doc ID 8673 Rev. 3 107/239
DP2
Address: 0xFFC2h / E1h SFR
Reset: 0x0000h
Type: R/W
ODP2
Address: 0xF1C2h / E1h ESFR
Reset: 0x0000h
Type: R/W
12.4.1 Altern ate functions of Port 2
All Port 2 lines (P2.15...P2.0) serve as capture inputs or compare outputs (CC15IO...CC0IO)
for the CAPCOM1 unit.
When a Port 2 line is used as a capture input, the state of the input latch, which represents
the state of the port pin, is directed to the CAPCOM unit via the line “Alternate Pin Data
Input”. If an external capture trigger signal is used, the direction of the respective pin must
be set to input. If the direction is set to output, the state of the port output latch will be read
since the pin represents the state of the output latch. This can be used to trigger a capture
event through software by setting or clearing the port latch. Note that in the output
configuration, no external device may drive the pin, otherwise conflicts would occur.
When a Port 2 line is used as a compare output (compare modes 1 and 3), the compare
event (or the timer overflow in compare mode 3) directly effects the port output latch. In
compare mode 1, when a valid compare match occurs, the state of the port output latch is
read by the CAPCOM control hardware via the line “Alternate Latch Data Input”, inverted,
and written back to the latch via the line “Alternate Data Output”.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
DP2.15
DP2.14
DP2.13
DP2.12
DP2.11
DP2.10
DP2.9
DP2.8
DP2.7
DP2.6
DP2.5
DP2.4
DP2.3
DP2.2
DP2.1
DP2.0
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
DP2.y Port direction register DP2 bit y
DP2.y = 0: Port line P2.y is an input (high-impedance)
DP2.y = 1: Port line P2.y is an output
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
ODP2.15
ODP2.14
ODP2.13
ODP2.12
ODP2.11
ODP2.10
ODP2.9
ODP2.8
ODP2.7
ODP2.6
ODP2.5
ODP2.4
ODP2.3
ODP2.2
ODP2.1
ODP2.0
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
ODP2.y Port 2 Open Drain control register bit y
ODP2.y = 0: Port line P2.y output driver in push/pull mode
ODP2.y = 1: Port line P2.y output driver in open drain mode
Parallel ports ST10F280
108/239 Doc ID 8673 Rev. 3
The port output latch is clocked by the signal “Compare Trigger” which is generated by the
CAPCOM unit. In compare mode 3, when a match occurs, the value '1' is written to the port
output latch via the line “Alternate Data Output”. When an overflow of the corresponding
timer occurs, a '0' is written to the port output latch. In both cases, the output latch is clocked
by the signal “Compare Trigger”.
The direction of the pin should be set to output by the user, otherwise the pin will be in the
high-impedance state and will not reflect the state of the output latch.
As can be seen from the port structure below, the user software always has free access to
the port pin even when it is used as a compare output. This is useful for setting up the initial
level of the pin when using compare mode 1 or the double-register mode. In these modes,
unlike in compare mode 3, the pin is not set to a specific value when a compare match
occurs, but is toggled instead.
When the user wants to write to the port pin at the same time a compare trigger tries to
clock the output latch, the write operation of the user software has priority. Each time a CPU
write access to the port output latch occurs, the input multiplexer of the port output latch is
switched to the line connected to the internal bus. The port output latch will receive the value
from the internal bus and the hardware triggered change will be lost.
As all other capture inputs, the capture input function of pins P2.15...P2.0 can also be used
as external interrupt inputs (200 ns sample rate at 40MHz CPU clock).
The upper eight Port 2 lines (P2.15...P2.8) also can serve as Fast External Interrupt inputs
from EX0IN to EX7IN. (Fast external interrupt sampling rate is 25ns at 40MHz CPU clock).
P2.15 in addition serves as input for CAPCOM2 timer T7 (T7IN).
The table below summarizes the alternate functions of Port 2.
Table 18. Port 2 alternate function
Port 2 pin Alternate
function a) Alternate function b) Alternate function c)
P2.0
P2.1
P2.2
P2.3
P2.4
P2.5
P2.6
P2.7
P2.8
P2.9
P2.10
P2.11
P2.12
P2.13
P2.14
P2.15
CC0IO
CC1IO
CC2IO
CC3IO
CC4IO
CC5IO
CC6IO
CC7IO
CC8IO
CC9IO
CC10IO
CC11IO
CC12IO
CC13IO
CC14IO
CC15IO
-
-
-
-
-
-
-
-
EX0IN Fast External Interrupt 0 Input
EX1IN Fast External Interrupt 1 Input
EX2IN Fast External Interrupt 2 Input
EX3IN Fast External Interrupt 3 Input
EX4IN Fast External Interrupt 4 Input
EX5IN Fast External Interrupt 5 Input
EX6IN Fast External Interrupt 6 Input
EX7IN Fast External Interrupt 7 Input
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
T7IN Timer T7 Ext. Count Input
ST10F280 Parallel ports
Doc ID 8673 Rev. 3 109/239
Figure 33. Port 2 I/O and alternate functi ons
The pins of Port 2 combine internal bus data with alternate data output before the port latch
input.
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Figure 34. Block diagram of a Port 2 pin
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Doc ID 8673 Rev. 3 111/239
12.5 Port 3
If this 15-bit port is used for general purpose I/O, the direction of each line can be configured
by the corresponding direction register DP3. Most port lines can be switched into push/pull
or open drain mode by the open drain control register ODP3 (pins P3.15, P3.14 and P3.12
do not support open drain mode).
Due to pin limitations register bit P3.14 is not connected to an output pin.
P3
Address: 0xFFC4h / E2h SFR
Reset: 0x0000h
Type: R/W
DP3
Address: 0xFFC6h / E3h SFR
Reset: 0x0000h
Type: R/W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
P3.15 - P3.13 P3.12 P3.11 P3.10 P3.9 P3.8 P3.7 P3.6 P3.5 P3.4 P3.3 P3.2 P3.1 P3.0
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
P3.y Port data register P3 bit y
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
DP3.15
-
DP3.13
DP3.12
DP3.11
DP3.10
DP3.9
DP3.8
DP3.7
DP3.6
DP3.5
DP3.4
DP3.3
DP3.2
DP3.1
DP3.0
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
DP3.y Port direction register DP3 bit y
DP3.y = 0: Port line P3.y is an input (high-impedance)
DP3.y = 1: Port line P3.y is an output
Parallel ports ST10F280
112/239 Doc ID 8673 Rev. 3
ODP3
Address: 0xF1C6h / E3h ESFR
Reset: 0x0000h
Type: R/W
12.5.1 Alternate functions of Port 3
The pins of Port 3 serve for various functions which include external timer control lines, the
two serial interfaces and the control lines BHE/WRH and CLKOUT.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
--
ODP3.13
-
ODP3.11
ODP3.10
ODP3.9
ODP3.8
ODP3.7
ODP3.6
ODP3.5
ODP3.4
ODP3.3
ODP3.2
ODP3.1
ODP3.0
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
ODP3.y Port 3 Open Drain control register bit y
ODP3.y = 0: Port line P3.y output driver in push-pull mode
ODP3.y = 1: Port line P3.y output driver in open drain mode
Table 19. Port 3 alternate functions
Port 3 pin Alternate function
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
P3.7
P3.8
P3.9
P3.10
P3.11
P3.12
P3.13
P3.14
P3.15
T0IN CAPCOM1 Timer 0 Count Input
T6OUT Timer 6 Toggle Output
CAPIN GPT2 Capture Input
T3OUT Timer 3 Toggle Output
T3EUD Timer 3 External Up/Down Input
T4IN Timer 4 Count Input
T3IN Timer 3 Count Input
T2IN Timer 2 Count Input
MRST SSC Master Receive / Slave Transmit
MTSR SSC Master Transmit / Slave Receive
TxD0 ASC0 Transmit Data Output
RxD0 ASC0 Receive Data Input / (Output in synchronous mode)
BHE/WRH Byte High Enable / Write High Output
SCLK SSC Shift Clock Input/Output
--- No pin assigned!
CLKOUT System Clock Output
ST10F280 Parallel ports
Doc ID 8673 Rev. 3 113/239
Figure 35. Port 3 I/O and alternate functi ons
The port structure of the Port 3 pins depends on their alternate function (see Figure 36).
When the on-chip peripheral associated with a Port 3 pin is configured to use the alternate
input function, it reads the input latch, which represents the state of the pin, via the line
labeled “Alternate Data Input”. Port 3 pins with alternate input functions are:
T0IN, T2IN, T3IN, T4IN, T3EUD and CAPIN.
When the on-chip peripheral associated with a Port 3 pin is configured to use the alternate
output function, its “Alternate Data Output” line is ANDed with the port output latch line.
When using these alternate functions, the user must set the direction of the port line to
output (DP3.y=1) and must set the port output latch (P3.y=1). Otherwise the pin is in its
high-impedance state (when configured as input) or the pin is stuck at '0' (when the port
output latch is cleared).
When the alternate output functions are not used, the “Alternate Data Output” line is in its
inactive state, which is a high level ('1'). Port 3 pins with alternate output functions are:
T6OUT, T3OUT, TxD0 and CLKOUT.
When the on-chip peripheral associated with a Port 3 pin is configured to use both the
alternate input and output function, the descriptions above apply to the respective current
operating mode. The direction must be set accordingly. Port 3 pins with alternate
input/output functions are: MTSR, MRST, RxD0 and SCLK.
Note: Enabling the CLKOUT function automatically enables the P3.15 output driver. Setting bit
DP3.15=’1’ is not required.
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114/239 Doc ID 8673 Rev. 3
Figure 36. Block diagram of Port 3 pin with alternate input or alternate output
function
Pin P3.12 (BHE/WRH) is another pin with an alternate output function, however, its structure
is slightly different (see Figure 37). After reset the BHE or WRH function must be used
depending on the system start-up configuration. In either of these cases, there is no
possibility to program any port latches before. Thus, the appropriate alternate function is
selected automatically. If BHE/WRH is not used in the system, this pin can be used for
general purpose I/O by disabling the alternate function (BYTDIS = ‘1’ / WRCFG=’0’).
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ST10F280 Parallel ports
Doc ID 8673 Rev. 3 115/239
Figure 37. Block diagram of pins P3.15 (CLKOUT) and P3.12 (BHE/WRH)
Note: Enabling the BHE or WRH function automatically enables the P3.12 output driver. Setting bit
DP3.12=’1’ is not required.
During bus hold, pin P3.12 is switched back to its standard function and is then controlled by
DP3.12 and P3.12. Keep DP3.12 = ’0’ in this case to ensure floating in hold mode.
12.6 Port 4
If this 8-bit port is used for general purpose I/O, the direction of each line can be configured
via the corresponding direction register DP4.
P4
Address: 0xFFC8h / E4h SFR
Reset: 0x--00h
Type: R/W
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R/W R/W R/W R/W R/W R/W R/W R/W
P4.y Port data register P4 bit y
Parallel ports ST10F280
116/239 Doc ID 8673 Rev. 3
DP4
Address: 0xFFCAh / E5h SFR
Reset: 0x--00h
Type: R/W
For CAN configuration support (see Chapter 15: CAN modules), Port 4 has a new open
drain function, controlled with the new ODP4 register:
ODP4
Address: 0xF1CAh / E5h ESFR
Reset: 0x--00h
Type: R/W
Note: Only bits 6 and 7 are implemented, all other bits will be read as “0”.
12.6.1 Alternate functions of Port 4
During external bus cycles that use segmentation (i.e. an address space above 64K Bytes)
a number of Port 4 pins may output the segment address lines. The number of pins used for
segment address output determines the directly accessible external address space.
The other pins of Port 4 may be used for general purpose I/O. If segment address lines are
selected, the alternate function of Port 4 may be necessary to access e.g. external memory
directly after reset. For this reason Port 4 will be switched to this alternate function
automatically.
The number of segment address lines is selected via PORT0 during reset. The selected
value can be read from bitfield SALSEL in register RP0H (read only) to check the
configuration during run time.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
--------DP4.7DP4.6DP4.5DP4.4DP4.3DP4.2DP4.1DP4.0
R/W R/W R/W R/W R/W R/W R/W R/W
DP4.y Port direction register DP4 bit y
DP4.y = 0: Port line P4.y is an input (high-impedance)
DP4.y = 1: Port line P4.y is an output
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
--------ODP4.7ODP4.6------
R/W R/W
ODP4.y Port 4 Open drain control register bit y
ODP4.y = 0: Port line P4.y output driver in push/pull mode
ODP4.y = 1: Port line P4.y output driver in open drain mode if P4.y is not a segment
address line output
ST10F280 Parallel ports
Doc ID 8673 Rev. 3 117/239
Devices with CAN interfaces use 2 pins of Port 4 to interface each CAN Module to an
external CAN transceiver. In this case the number of possible segment address lines is
reduced.
The table below summarizes the alternate functions of Port 4 depending on the number of
selected segment address lines (coded via bitfield SALSEL).
.
Figure 38. Port 4 I/O and alternate functi ons
Table 20. Port 4 alternate functions
Port 4
pin Std. Function
SALSEL=01 64 KB Altern. Function
SALSEL=11 256KB Altern. Function
SALSEL=00 1MB Altern. Function
SALSEL=10 16MB
P4.0
P4.1
P4.2
P4.3
P4.4
P4.5
P4.6
P4.7
GPIO
GPIO
GPIO
GPIO
GPIO/CAN2_RxD
GPIO/CAN1_RxD
GPIO/CAN1_TxD
GPIO/CAN2_TxD
Seg. Address A16
Seg. Address A17
GPIO
GPIO
GPIO/CAN2_RxD
GPIO/CAN1_RxD
GPIO/CAN1_TxD
GPIO/CAN2_TxD
Seg. Address A16
Seg. Address A17
Seg. Address A18
Seg. Address A19
GPIO/CAN2_RxD
GPIO/CAN1_RxD
GPIO/CAN1_TxD
GPIO/CAN2_TxD
Seg. Address A16
Seg. Address A17
Seg. Address A18
Seg. Address A19
Seg. Address A20
Seg. Address A21
Seg. Address A22
Seg. Address A23
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118/239 Doc ID 8673 Rev. 3
Figure 39. Block diagram of a Port 4 pin
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Doc ID 8673 Rev. 3 119/239
Figure 40. Block diagram of P4.4 and P4.5 pins
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120/239 Doc ID 8673 Rev. 3
Figure 41. Block diagram of P4.6 and P4.7 pins
12.7 Port 5
This 16-bit input port can only read data. There is no output latch and no direction register.
Data written to P5 will be lost.
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ST10F280 Parallel ports
Doc ID 8673 Rev. 3 121/239
P5
Address: 0xFFA2h / D1h SFR
Reset: 0xXXXXh
Type: R
12.7.1 Alternate functions of Port 5
Each line of Port 5 is also connected to one of the multiplexer of the Analog/Digital
Converter. All port lines (P5.15...P5.0) can accept analog signals (AN15...AN0) that can be
converted by the ADC. No special programming is required for pins that shall be used as
analog inputs. Some pins of Port 5 also serve as external timer control lines for GPT1 and
GPT2. The table below summarizes the alternate functions of Port 5.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
P5.15 P5.14 P5.13 P5.12 P5.11 P5.10 P5.9 P5.8 P5.7 P5.6 P5.5 P5.4 P5.3 P5.2 P5.1 P5.0
RRRRRRRRRRRRRRRR
P5.y Port data register P5 bit y (Read only)
Table 21. Port 5 alternate functions
Port 5 pin Alternate function a) Alternate function b)
P5.0
P5.1
P5.2
P5.3
P5.4
P5.5
P5.6
P5.7
P5.8
P5.9
P5.10
P5.11
P5.12
P5.13
P5.14
P5.15
Analog Input AN0
Analog Input AN1
Analog Input AN2
Analog Input AN3
Analog Input AN4
Analog Input AN5
Analog Input AN6
Analog Input AN7
Analog Input AN8
Analog Input AN9
Analog Input AN10
Analog Input AN11
Analog Input AN12
Analog Input AN13
Analog Input AN14
Analog Input AN15
-
-
-
-
-
-
-
-
-
-
T6EUD Timer 6 ext. Up/Down Input
T5EUD Timer 5 ext. Up/Down Input
T6IN Timer 6 Count Input
T5IN Timer 5 Count Input
T4EUD Timer 4 ext. Up/Down Input
T2EUD Timer 2 ext. Up/Down Input
Parallel ports ST10F280
122/239 Doc ID 8673 Rev. 3
Figure 42. Port 5 I/O and alternate functi ons
Port 5 pins have a special port structure (see Figure 43), first because it is an input only
port, and second because the analog input channels are directly connected to the pins
rather than to the input latches.
Figure 43. Block diagram of a Port 5 pin
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ST10F280 Parallel ports
Doc ID 8673 Rev. 3 123/239
Port 5 Schmitt trigger analog inputs
A Schmitt trigger protection can be activated on each pin of Port 5 by setting the dedicated
bit of register P5DIDIS.
P5DIDIS
Address: 0xFFA4h / D2h SFR
Reset: 0x0000h
Type: R/W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
P5DIDIS.15
P5DIDIS.14
P5DIDIS.13
P5DIDIS.12
P5DIDIS.11
P5DIDIS.10
P5DIDIS.9
P5DIDIS.8
P5DIDIS.7
P5DIDIS.6
P5DIDIS.5
P5DIDIS.4
P5DIDIS.3
P5DIDIS.2
P5DIDIS.1
P5DIDIS.0
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
P5DIDIS.y Port 5 Digital Disablel register bit y
P5DIDIS.y = 0: Port line P5.y digital input is enabled (Schmitt trigger enabled)
P5DIDIS.y = 1: Port line P5.y digital input is disabled (Schmitt trigger disabled,
necessary for input leakage current reduction)
Parallel ports ST10F280
124/239 Doc ID 8673 Rev. 3
12.8 Port 6
If this 8-bit port is used for general purpose I/O, the direction of each line can be configured
via the corresponding direction register DP6. Each port line can be switched into push/pull
or open drain mode via the open drain control register ODP6.
P6 (FFCCh / E6h)
Address: 0xFFCCh / E6h SFR
Reset: 0x--00h
Type: R/W
DP6
Address: 0xFFCEh / E7h SFR
Reset: 0x--00h
Type: R/W
ODP6
Address: 0xF1CEh / E7h ESFR
Reset: 0x--00h
Type: R/W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
- - - - - - - - P6.7 P6.6 P6.5 P6.4 P6.3 P6.2 P6.1 P6.0
R/W R/W R/W R/W R/W R/W R/W R/W
P6.y Port data register P6 bit y
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
--------DP6.7DP6.6DP6.5DP6.4DP6.3DP6.2DP6.1DP6.0
R/W R/W R/W R/W R/W R/W R/W R/W
DP6.y Port direction register DP6 bit y
DP6.y = 0: Port line P6.y is an input (high-impedance)
DP6.y = 1: Port line P6.y is an output
1514131211109876543210
--------
ODP6.7
ODP6.6
ODP6.5
ODP6.4
ODP6.3
ODP6.2
ODP6.1
ODP6.0
R/W R/W R/W R/W R/W R/W R/W R/W
ODP6.y Port 6 Open Drain control register bit y
ODP6.y = 0: Port line P6.y output driver in push/pull mode
ODP6.y = 1: Port line P6.y output driver in open drain mode
ST10F280 Parallel ports
Doc ID 8673 Rev. 3 125/239
12.8.1 Alternate functions of Port 6
A programmable number of chip select signals (CS4...CS0) derived from the bus control
registers (BUSCON4...BUSCON0) can be output on the 5 pins of Port 6. The number of chip
select signals is selected via PORT0 during reset. The selected value can be read from
bitfield CSSEL in register RP0H (read only) e.g. in order to check the configuration during
run time. The table below summarizes the alternate functions of Port 6 depending on the
number of selected chip select lines (coded via bitfield CSSEL).
Figure 44. Port 6 I/O and alternate functi ons
The chip select lines of Port 6 have an internal weak pull-up device. This device is switched
on during reset. This feature is implemented to drive the chip select lines high during reset
in order to avoid multiple chip selection.
After reset the CS function must be used, if selected so. In this case there is no possibility to
program any port latches before. Thus the alternate function (CS) is selected automatically
in this case.
Note: The open drain output option can only be selected via software earliest during the
initialization routine; at least signal CS0 will be in push/pull output driver mode directly after
reset.
Table 22. Port 6 alternate functions
Port 6 Pin Altern. Function
CSSEL = 10 Altern. Function
CSSEL = 01 Altern. Function
CSSEL = 00 Altern. Function
CSSEL = 11
P6.0
P6.1
P6.2
P6.3
P6.4
General purpose I/O
General purpose I/O
General purpose I/O
General purpose I/O
General purpose I/O
Chip select CS0
Chip select CS1
Gen. purpose I/O
Gen. purpose I/O
Gen. purpose I/O
Chip select CS0
Chip select CS1
Chip select CS2
Gen. purpose I/O
Gen. purpose I/O
Chip select CS0
Chip select CS1
Chip select CS2
Chip select CS3
Chip select CS4
P6.5
P6.6
P6.7
HOLD External hold request input
HLDA Hold acknowledge output
BREQ Bus request output
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Parallel ports ST10F280
126/239 Doc ID 8673 Rev. 3
Figure 45. Block diagram of Port 6 pins with an alternate output function
Note: * P6.5 has only alternate input function.
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Doc ID 8673 Rev. 3 127/239
12.9 Port 7
If this 8-bit port is used for general purpose I/O, the direction of each line can be configured
via the corresponding direction register DP7. Each port line can be switched into push/pull
or open drain mode via the open drain control register ODP7.
P7
Address: 0xFFD0h / E8h SFR
Reset: 0x--00h
Type: R/W
DP7
Address: 0xFFD2h / E9h SFR
Reset: 0x--00h
Type: R/W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
- - - - - - - - P7.7 P7.6 P7.5 P7.4 P7.3 P7.2 P7.1 P7.0
R/W R/W R/W R/W R/W R/W R/W R/W
P7.y Port data register P7 bit y
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
--------DP7.7DP7.6DP7.5DP7.4DP7.3DP7.2DP7.1DP7.0
R/W R/W R/W R/W R/W R/W R/W R/W
DP7.y Port direction register DP7 bit y
DP7.y = 0: Port line P7.y is an input (high impedance)
DP7.y = 1: Port line P7.y is an output
Parallel ports ST10F280
128/239 Doc ID 8673 Rev. 3
ODP7
Address: 0xF1D2h / E9h ESFR
Reset: 0x--00h
Type: R/W
12.9.1 Alternate functions of Port 7
The upper 4 lines of Port 7 (P7.7...P7.4) serve as capture inputs or compare outputs
(CC31IO...CC28IO) for the CAPCOM2 unit.
The usage of the port lines by the CAPCOM unit, its accessibility via software and the
precautions are the same as described for the Port 2 lines.
As all other capture inputs, the capture input function of pins P7.7...P7.4 can also be used
as external interrupt inputs (200 ns sample rate at 40MHz CPU clock).
The lower 4 lines of Port 7 (P7.3...P7.0) serve as outputs from the PWM module
(POUT3...POUT0). At these pins the value of the respective port output latch is XORed with
the value of the PWM output rather than ANDed, as the other pins do. This allows to use the
alternate output value either as it is (port latch holds a ‘0’) or invert its level at the pin (port
latch holds a ‘1’).
Note that the PWM outputs must be enabled via the respective PENx bits in PWMCON1.
The table below summarizes the alternate functions of Port 7.
1514131211109876543210
- - - - - - - - ODP7.7 ODP7.6 ODP7.5 ODP7.4 ODP7.3 ODP7.2 ODP7.1 ODP7.0
R/W R/W R/W R/W R/W R/W R/W R/W
ODP7.y Port 7 Open Drain control register bit y
ODP7.y = 0: Port line P7.y output driver in push-pull mode
ODP7.y = 1: Port line P7.y output driver in open drain mode
Table 23. Port 7 alternate functions
Port 7 pin Alternate function
P7.0
P7.1
P7.2
P7.3
P7.4
P7.5
P7.6
P7.7
POUT0 PWM mode channel 0 output
POUT1 PWM mode channel 1 output
POUT2 PWM mode channel 2 output
POUT3 PWM mode channel 3 output
CC28IO Capture input / compare output channel 28
CC29IO Capture input / compare output channel 29
CC30IO Capture input / compare output channel 30
CC31IO Capture input / compare output channel 31
ST10F280 Parallel ports
Doc ID 8673 Rev. 3 129/239
Figure 46. Port 7 I/O and alternate functi ons
The port structures of Port 7 differ in the way the output latches are connected to the internal
bus and to the pin driver (see the two Figure 47). Pins P7.3...P7.0 (POUT3...POUT0) XOR
the alternate data output with the port latch output, which allows to use the alternate data
directly or inverted at the pin driver.
Figure 47. Block diagram of Port 7 pins P7.3...P7.0
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130/239 Doc ID 8673 Rev. 3
Figure 48. Block diagram of Port 7 pins P7.7...P7.4
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ST10F280 Parallel ports
Doc ID 8673 Rev. 3 131/239
12.10 Port 8
If this 8-bit port is used for general purpose I/O, the direction of each line can be configured
via the corresponding direction register DP8. Each port line can be switched into push/pull
or open drain mode via the open drain control register ODP8.
P8
Address: 0xFFD40h / EAh SFR
Reset: 0x--00h
Type: R/W
DP8
Address: 0xFFD6h / EBh SFR
Reset: 0x--00h
Type: R/W
ODP8
Address: 0xF1D6h / EBh ESFR
Reset: 0x--00h
Type: R/W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
- - - - - - - - P8.7 P8.6 P8.5 P8.4 P8.3 P8.2 P8.1 P8.0
R/W R/W R/W R/W R/W R/W R/W R/W
P8.y Port data register P8 bit y
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
--------DP8.7DP8.6DP8.5DP8.4DP8.3DP8.2DP8.1DP8.0
R/W R/W R/W R/W R/W R/W R/W R/W
DP8.y Port direction register DP8 bit y
DP8.y = 0: Port line P8.y is an input (high impedance)
DP8.y = 1: Port line P8.y is an output
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
- - - - - - - - ODP8.7 ODP8.6 ODP8.5 ODP8.4 ODP8.3 ODP8.2 ODP8.1 ODP8.0
R/W R/W R/W R/W R/W R/W R/W R/W
ODP8.y Port 8 Open Drain control register bit y
ODP8.y = 0: Port line P8.y output driver in push-pull mode
ODP8.y = 1: Port line P8.y output driver in open drain mode
Parallel ports ST10F280
132/239 Doc ID 8673 Rev. 3
12.10.1 Alternate functions of Port 8
The 8 lines of Port 8 (P8.7...P8.0) serve as capture inputs or compare outputs
(CC23IO...CC16IO) for the CAPCOM2 unit.
The usage of the port lines by the CAPCOM unit, its accessibility via software and the
precautions are the same as described for the Port 2 lines.
As all other capture inputs, the capture input function of pins P8.7...P8.0 can also be used
as external interrupt inputs (200 ns sample rate at 40MHz CPU clock).
The Tab le 24 summarizes the alternate functions of Port 8.
Figure 49. Port 8 I/O and alternate functi ons
The port structures of Port 8 differ in the way the output latches are connected to the internal
bus and to the pin driver (see the Figure 50). Pins P8.7...P8.0 (CC23IO...CC16IO) combine
internal bus data and alternate data output before the port latch input, as do the Port 2 pins.
Table 24. Port 8 alternate functions
Port 7 Alt ernate function
P8.0
P8.1
P8.2
P8.3
P8.4
P8.5
P8.6
P8.7
CC16IO Capture input / compare output channel 16
CC17IO Capture input / compare output channel 17
CC18IO Capture input / compare output channel 18
CC19IO Capture input / compare output channel 19
CC20IO Capture input / compare output channel 20
CC21IO Capture input / compare output channel 21
CC22IO Capture input / compare output channel 22
CC23IO Capture input / compare output channel 23
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ST10F280 Parallel ports
Doc ID 8673 Rev. 3 133/239
Figure 50. Block diagram of Port 8 pins P8.7...P8.0
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Parallel ports ST10F280
134/239 Doc ID 8673 Rev. 3
12.11 XPort 9
The XPort9 is enabled by setting XPEN bit 2 of the SYSCON register and XPORT9EN bit 3
of the new XPERCON register. On the XBUS interface, the register are not bit-addressable
This 16-bit port is used for general purpose I/O, the direction of each line can be configured
via the corresponding direction register XDP9. Each port line can be switched into push/pull
or open drain mode via the open drain control register XODP9.
All port lines can be individually (bit-wise) programmed. The “bit-addressable” feature is
available via specific “Set” and “Clear” registers: XP9SET, XP9CLR, XDP9SET, XDP9CLR,
XODP9SET, XODP9CLR.
XP9
Address: 0xC100h
Reset: 0x0000h
Type: R/W
XP9SET (C102h)
Address: 0xC102h
Reset: 0x0000h
Type: W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
XP9.15
XP9.14
XP9.13
XP9.12
XP9.11
XP9.10
XP9.9
XP9.8
XP9.7
XP9.6
XP9.5
XP9.4
XP9.3
XP9.2
XP9.1
XP9.0
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
XP9.y Port data register XP9 bit y
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
XP9SET.15
XP9SET.14
XP9SET.13
XP9SET.12
XP9SET.11
XP9SET.10
XP9SET.9
XP9SET.8
XP9SET.7
XP9SET.6
XP9SET.5
XP9SET.4
XP9SET.3
XP9SET.2
XP9SET.1
XP9SET.0
WWWWWWWWWWWWWWWW
XP9SET.y Writing a ‘1’ will set the corresponding bit in XP9 register, Writing a ‘0’ has no effect.
ST10F280 Parallel ports
Doc ID 8673 Rev. 3 135/239
XP9CLR
Address: 0xC104h
Reset: 0x0000h
Type: W
XDP9
Address: 0xC200h
Reset: 0x0000h
Type: R/W
XDP9SET
Address: 0xC202h
Reset: 0x0000h
Type: W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
XP9CLR.15
XP9CLR.14
XP9CLR.13
XP9CLR.12
XP9CLR.11
XP9CLR.10
XP9CLR.9
XP9CLR.8
XP9CLR.7
XP9CLR.6
XP9CLR.5
XP9CLR.4
XP9CLR.3
XP9CLR.2
XP9CLR.1
XP9CLR.0
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XP9CLR.y Writing a ‘1’ will clear the corresponding bit in XP9 register, Writing a ‘0’ has no effect.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
XDP9.15
XDP9.14
XDP9.13
XDP9.12
XDP9.11
XDP9.10
XDP9.9
XDP9.8
XDP9.7
XDP9.6
XDP9.5
XDP9.4
XDP9.3
XDP9.2
XDP9.1
XDP9.0
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
XDP9.y Port direction register XDP9 bit y
XDP9.y = 0: Port line XP9.y is an input (high-impedance)
XDP9.y = 1: Port lineX P9.y is an output
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
XDP9 SET.15
XDP9 SET.14
XDP9 SET.13
XDP9 SET.12
XDP9 SET.11
XDP9 SET.10
XDP9 SET.9
XDP9 SET.8
XDP9 SET.7
XDP9 SET.6
XDP9 SET.5
XDP9 SET.4
XDP9 SET.3
XDP9 SET.2
XDP9 SET.1
XDP9 SET.0
WWWWWWWWWWWWWWWW
XDP9SET.y Writing a ‘1’ will set the corresponding bit in XDP9 register, Writing a ‘0’ has no effect.
Parallel ports ST10F280
136/239 Doc ID 8673 Rev. 3
XDP9CLR
Address: 0xC204h
Reset: 0x0000h
Type: W
XODP9
Address: 0xC300h
Reset: 0x0000h
Type: R/W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
XDP9 CLR.15
XDP9 CLR.14
XDP9 CLR.13
XDP9 CLR.12
XDP9 CLR.11
XDP9 CLR.10
XDP9 CLR.9
XDP9 CLR.8
XDP9 CLR.7
XDP9 CLR.6
XDP9 CLR.5
XDP9 CLR.4
XDP9 CLR.3
XDP9 CLR.2
XDP9 CLR.1
XDP9 CLR.0
WWWWWWWWWWWWWWWW
XDP9CLR.y Writing a ‘1’ will clear the corresponding bit in XDP9 register, Writing a ‘0’ has no
effect.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
XODP9 .15
XODP9 .14
XODP9 .13
XODP9 .12
XODP9 .11
XODP9 .10
XODP9 .9
XODP9 .8
XODP9 .7
XODP9 .6
XODP9 .5
XODP9 .4
XODP9 .3
XODP 9.2
XODP9 .1
XODP9 .0
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
XODP9.y Port 9 Open Drain control register bit y
XODP9.y = 0: Port line XP9.y output driver in push/pull mode
XODP9.y = 1: Port line XP9.y output driver in open drain mode
ST10F280 Parallel ports
Doc ID 8673 Rev. 3 137/239
XODP9SET (C302h)
Address: 0xC302h
Reset: 0x0000h
Type: W
XODP9CLR
Address: 0xC304h
Reset: 0x0000h
Type: W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
XODP9SET.15
XODP9SET.14
XODP9SET.13
XODP9SET.12
XODP9SET.11
XODP9SET.10
XODP9SET.9
XODP9SET.8
XODP9SET.7
XODP9SET.6
XODP9SET.5
XODP9SET.4
XODP9SET.3
XODP9SET.2
XODP9SET.1
XODP9SET.0
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effect.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
XODP9CLR.15
XODP9CLR.14
XODP9CLR.13
XODP9CLR.12
XODP9CLR.11
XODP9CLR.10
XODP9CLR.9
XODP9CLR.8
XODP9CLR.7
XODP9CLR.6
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XODP9CLR.3
XODP9CLR.2
XODP9CLR.1
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effect.
Parallel ports ST10F280
138/239 Doc ID 8673 Rev. 3
12.12 XPort 10
The XPort10 is enabled by setting XPEN bit 2 of the SYSCON register and bit 3 of the new
XPERCON register. On the XBUS interface, the register are not bit-addressable. This 16-bit
input port can only read data. There is no output latch and no direction register. Data written
to XP10 will be lost.
XP10
Address: 0xC380h
Reset: 0xXXXXh
Type: R
12.12.1 Alternate functions of XPort 10
Each line of XPort 10 is also connected to one of the multiplexer of the Analog/Digital
Converter. All port lines (XP10.15...XP10.0) can accept analog signals (AN31...AN16) that
can be converted by the ADC. No special programming is required for pins that shall be
used as analog inputs. The Ta b l e 25 summarizes the alternate functions of XPort 10.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
XP10 .15
XP10 .14
XP10 .13
XP10 .12
XP10 .11
XP10 .10
XP10 .9
XP10 .8
XP10 .7
XP10 .6
XP10 .5
XP10 .4
XP10 .3
XP10 .2
XP10 .1
XP10 .0
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XP10.y Port data register XP10 bit y (Read only)
Table 25. XPort 10 alternate functions
XPort 10 Pin Alternate function
P10.0
P10.1
P10.2
P10.3
P10.4
P10.5
P10.6
P10.7
P10.8
P10.9
P10.10
P10.11
P10.12
P10.13
P10.14
P10.15
Analog Input AN16
Analog Input AN17
Analog Input AN18
Analog Input AN19
Analog Input AN20
Analog Input AN21
Analog Input AN22
Analog Input AN23
Analog Input AN24
Analog Input AN25
Analog Input AN26
Analog Input AN27
Analog Input AN28
Analog Input AN29
Analog Input AN30
Analog Input AN31
ST10F280 Parallel ports
Doc ID 8673 Rev. 3 139/239
Figure 51. PORT10 I/O and alternate functions
12.12.2 New disturb protection on analog input s
A new register is provided for additional disturb protection support on analog inputs for Port
XP10:
XP10DIDIS
Address: 0xC382h
Reset: 0x0000h
Type: R/W
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XP10DIDIS.y XPort 10 Digital Disable register bit y
0: Port line XP10.y digital input is enabled (Schmitt trigger enabled)
1: Port line XP10.y digital input is disabled (Schmitt trigger disabled, necessary for
input leakage current reduction)
A/D converter ST10F280
140/239 Doc ID 8673 Rev. 3
13 A/D converter
13.1 A/D converter module
A 10-bit A/D converter with 2 x 16 multiplexed input channels and a sample and hold circuit
is integrated on-chip. This A/D Converter does not have the self-calibration feature. Thus,
guaranteed Total Unadjusted Error is + 2 LSB. Refer to Section 20.3.1: A/D converter
characteristics for detailled characteristics. The sample time (for loading the capacitors) and
the conversion time is programmable and can be adjusted to the external circuitry.
Convertion time is fully equivalent to the one of previous generation A/D self-calibrated
Converter.
To remove high frequency components from the analog input signal, a low-pass filter must
be connected at the ADC input.
Overrun error detection/protection is controlled by the ADDAT register. Either an interrupt
request is generated when the result of a previous conversion has not been read from the
result register at the time the next conversion is complete, or the next conversion is
suspended until the previous result has been read. For applications which require less than
16 analog input channels, the remaining channel inputs can be used as digital input port
pins.
The A/D converter of the ST10F280 supports four different conversion modes:
Single channel c onversion mode the analog level on a specified channel is sampled once
and converted to a digital result.
Single channel continuous mode the analog level on a specified channel is repeatedly
sampled and converted without software intervention.
Auto scan mode the analog levels on a pre-specified number of channels are sequentially
sampled and converted.
Auto scan continuous mode the number of pre-specified channels is repeatedly sampled
and converted.
Channel Injection Mode injects a channel into a running sequence without disturbing this
sequence. The peripheral event controller stores the conversion results in memory without
entering and exiting interrupt routines for each data transfer.
13.2 Multiplexage of two blocks of 16 analog Input s
The ADC can manage 16 analog inputs, so to increase its capability, a new XADCMUX
register is added to control the multiplexage between the first block of 16 channels on Port5
and the second block of 16 channels on XPort10. The conversion result register stays
identical and only a software management can determine the block in use.
ST10F280 A/D converter
Doc ID 8673 Rev. 3 141/239
Figure 52. Block diagram
The XADCMUX register is enabled by setting XPEN bit 2 of the SYSCON register and bit 3
of the new XPERCON register
XADCMUX
Address: 0xC384h
Reset: 0x0000h
Type: R/W
13.3 XTIMER peripheral (trigger for ADC channel injection)
This new peripheral is dedicated for the Channel Injection Mode of the A/D converter. This
mode injects a channel into a running sequence without disturbing this sequence. The
peripheral event controller stores the conversion results in memory without entering and
exiting interrupt routines for each data transfer.
A channel injection can be triggered by an event on Capture/Compare CC31 (Port P7.7) of
the CAPCOM2 unit.
The dedicated output XADCINJ of the XTIMER must be connected externally on the input
P7.7/CC31.
151413121110987654321 0
---------------XADCMUX
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1: Analog inputs on port XP10.y can be converted
A/D converter ST10F280
142/239 Doc ID 8673 Rev. 3
Due to the multiplexed inputs, at a time, the ADC exclusively converts the Port5 inputs or the
XPort10 inputs. If one "y" channel has to be used continuously in injection mode, it must be
externally hardware connected to the Port5.y and XPort10.y inputs.
The XTIMER peripheral is enabled by setting XPEN bit 2 of the SYSCON register and bit 3
of the new XPERCON register.
13.3.1 Main features
The XTIMER features are :
●16 bits linear timer / 4 bits exponential prescaler
●Counting between 16 bits “start value” and 16 bits “end value”
●Counting period between 4 cycles and 2**33 cycles (100 ns and 214s using 40MHz
CPU clock)
●1 trigger ouput (XADCINJ)
●Programmable functions :
– Internal clock XCLK is derivated from the CPU clock and has the same period
– Up counting / down counting
– Reload enable
– Continue / stop modes
●4 memory mapped registers :
– Control / prescaler
– Start value
–End value
– Current value
Table 26. The different counting Modes
TLE TCS TCVR(n) = TEVR TUD TEN TCVR(n+1) comments
xx x x 0 TCVR(n) Timer disable
x0 1 x
1
Stop
xx 0 0 TCVR(n)-1 Decrement
0 1 1 Decrement (Continue)
xx 0 1 TCVR(n)+1 Increment
0 1 1 Increment (Continue)
1 1 1 x TSVR Load
ST10F280 A/D converter
Doc ID 8673 Rev. 3 143/239
13.3.2 Register description
TCR: Timer Con trol Register
XTCR
Address: 0xC000h
Reset: 0x0000h
Type: R, R/W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
000000 TFP[3:0] TCMTIETCSTLETUDTEN
R R R R R R RW RW RW RW RW RW RW
TEN Timer Enable
When TEN = ’0’, the Timer is disabled (reset value). To avoid glitches, it is recommended
to modify TCR in 2 steps, first with new values and and second by setting TEN.
TUD Timer Up / Down Counting
When TUD = ’0’, the Timer is counting "down" (reset value), ie the TCVR (’current value’)
register content is decremented.
When TUD = ’1’, the Timer is counting "up", ie the TCVR (’current value’) register content
is incremented.
TLE Timer Load Enable
When the counter has reached its end value (TCVR = TEVR), TCVR is (re)loaded with
TSVR (’start value’) register content when TLE = ’1’. When TLE = ’0’ (reset value), the
next state of TCVR depends on TCS bit.
TCS Timer Continue / Stop
When TLE = ’0’ (no load) and when the counter has reached its end value (TCVR =
TEVR), the TCVR content continues to increment / decrement according to TUD bit when
TCS = ’1’ (continue mode).
When TCS = ’0’ (stop mode reset value), TCVR is stopped and its content is frozen.
TIE Timer Output Enable
When the counter has reached its end value (TCVR = TEVR), the XADCINJ output is set
when TIE = ’1’.
When TIE = ’0’ (reset value), XADCINJ output is disabled (= ’0’).
TCM Timer Clock Mode Must be Cleared
TCM = ’0’ (reset value), the TCVR clock is derived from internal XCLK clock according to
TFP bits.
TFP[3:0] Timer Frequency Prescaler
When TCM = ’0’ (internal clock), the TCVR register clock is derived from the XCLK clock
input by dividing XCLK by 2**(2+ TFP). The coding is as follows :
0000 : prescaler by 2 (reset value), XCLK divided by 4
0001 : prescaler by 4, XCLK divided by 8
0010 : prescaler by 8, XCLK divided by 16
...
1111 : prescaler by 2**16, XCLK divided by 2**17
A/D converter ST10F280
144/239 Doc ID 8673 Rev. 3
XTSVR : Timer Start Value Register
Address: 0xC002h
Reset: 0x0000h
Type: R/W
XTEVR : Timer End Value Register
Address: 0xC004h
Reset: 0x0000h
Type: R/W
XTCVR : Timer Current Value Register
Address: 0xC006h
Reset: 0x0000h
Type: R
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
TSVR
RW
TSVR[15:0] Timer Start Value
TSVR contains the data to be transferred to the TCVR ’Current Value’ register when :
– TEN = ’1’ (TIM enable),
TLE = ’1’ (TIM Load enable),
TCVR = TEVR (count period finished),
TCS = ’1’ (stop mode disabled).
– first counting clock rising edge after the timer start (the timer starts on TEN rising
edge).
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
TEVR
RW
TEVR[15:0] Timer End Value
TEVR contains the data to be compared to the TCVR ’Current Value’ register.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
TCVR
R
TCVR[15:0] Timer Current Value
TCVR contains the current counting value. When TCVR = TEVR, TCVR content is
changed according to Table . The TCVR clock is derived from internal XCLK clock
according to TFP bits when TCM = ’0’.
ST10F280 A/D converter
Doc ID 8673 Rev. 3 145/239
Registers mapping
13.3.3 Block diagram
Figure 53. XTIMER block diagram
Clocks
The XTCVR register clock is the prescaler output. The prescaler allows to divide the basic
register frequency in order to offer a wide range of counting period, from 2**2 to 2**33
cycles (note that 1 cycle = 1 XCLK periods).
Table 27. Timer registers mapping
Address (Hexa) Register Name Reset Value (Hexa) Access
C000h XTCR : Control 0000h RW
C002h XTSVR : Start Value 0000h RW
C004h XTEVR : End Value 0000h RW
C006h XTCVR : Current Value 0000h R
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A/D converter ST10F280
146/239 Doc ID 8673 Rev. 3
Registers
The XTCVR register input is linked to several sources:
●XTSVR register (start value) for reload when the period is finished, or for load when
the timer is starting.
●Incrementer output when the ’up’ mode is selected,
●Decrementer output when the ’down’ mode is selected.
●The selection between the sources is made through the XTCR control register.
When starting the timer, by setting TEN bit of TCR to ’1’, XTCVR will be loaded with XTSVR
value on the first rising edge of the counting clock. That’s to say that for counting from 0000h
to 0009h for example, 10 counting clock rising edges are required.
The XTCVR register output is continuously compared to the XTEVR register to detect the
end of the counting period. When the registers are equal, several actions are made
depending on the XTCR control register content :
●The output XADCINJ is conditionally generated,
●XTCVR is loaded with XTSVR or stops or continues to count (see Table ).
XTEVR, XTSVR and all TCR bits except TEN must not be modified while the timer is
counting, ie while TEN bit of TCR = ’1’. The timer behaviour is not guaranteed if this rule is
not respected. It implies that the timer can be configured only when stopped (TEN = ’0’).
When programming the timer, XTEVR, XTSVR and XTCR bits except TEN can be modified,
with TEN = ’0’; then the timer is started by modifying only TEN bit of TCR. To stop the timer,
only TEN bit should be modified, from ’1’ to ’0’.
Timer output (XADCINJ)
The XADCINJ output is the result of the (XTCVR = XTEVR) flag after differentiation. The
duration of the output lasts two cycles (50ns at 40MHz).
Figure 54. XADCINJ timer output
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ST10F280 A/D converter
Doc ID 8673 Rev. 3 147/239
Figure 55. External connection for ADC channel injection
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Serial channels ST10F280
148/239 Doc ID 8673 Rev. 3
14 Serial channels
Serial communication with other microcontrollers, microprocessors, terminals or external
peripheral components is provided by two serial interfaces: the asynchronous / synchronous
serial channel (ASCO) and the high-speed synchronous serial channel (SSC). Two
dedicated Baud rate generators set up all standard Baud rates without the requirement of
oscillator tuning. For transmission, reception and erroneous reception, 3 separate interrupt
vectors are provided for each serial channel.
14.1 Asynchronous / Synchronous Serial Interface (ASCO)
The asynchronous / synchronous serial interface (ASCO) provides serial communication
between the ST10F280 and other microcontrollers, microprocessors or external peripherals.
A set of registers is used to configure and to control the ASCO serial interface:
●P3, DP3, ODP3 for pin configuration
●SOBG for Baud rate generator
●SOTBUF for transmit buffer
●SOTIC for transmit interrupt control
●SOTBIC for transmit buffer interrupt control
●SOCON for control
●SORBUF for receive buffer (read only)
●SORIC for receive interrupt control
●SOEIC for error interrupt control
ST10F280 Serial channels
Doc ID 8673 Rev. 3 149/239
14.1.1 ASCO in asynchronous mode
In asynchronous mode, 8 or 9-bit data transfer, parity generation and the number of stop bit
can be selected. Parity framing and overrun error detection is provided to increase the
reliability of data transfers. Transmission and reception of data is double-buffered. Full-
duplex communication up to 1.25M Bauds (at 40MHz of fCPU) is supported in this mode.
Figure 56. Asynchronous mode of serial channel ASC0
Asynchronous mode baud rates
For asynchronous operation, the Baud rate generator provides a clock with 16 times the rate
of the established Baud rate. Every received Bit is sampled at the 7th, 8th and 9th cycle of
this clock. The Baud rate for asynchronous operation of serial channel ASC0 and the
required reload value for a given Baud rate can be determined by the following formulas:
(S0BRL) represents the content of the reload register, taken as unsigned 13 Bit integer,
(S0BRS) represents the value of Bit S0BRS (‘0’ or ‘1’), taken as integer.
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Serial channels ST10F280
150/239 Doc ID 8673 Rev. 3
Using the above equation, the maximum Baud rate can be calculated for any given clock
speed. Baud rate versus reload register value (SOBRS=0 and SOBRS=1) is described in
Ta bl e 2 8 .
Note: The deviation errors given in the Ta bl e 2 8 are rounded. To avoid deviation errors use a Baud
rate crystal (providing a multiple of the ASC0/SSC sampling frequency).
Table 28. Commonly used baud rates by reload value and deviation errors
S0BRS = ‘0’, fCPU = 40MHz S0BRS = ‘1’, fCPU = 40MHz
Baud rate
(Baud) Deviation
error Reload value
(hexa) Baud rate
(Baud) Deviation
error Reload v alue
(hexa)
1 250 000 0.0% / 0.0% 0000 / 0000 833 333 0.0% / 0.0% 0000 / 0000
112 000 +1.5% /7.0% 000A / 000B 112 000 +6.3% /7.0% 0006 / 0007
56 000 +1.5% /3.0% 0015 / 0016 56 000 +6.3% /0.8% 000D / 000E
38 400 +1.7% /1.4% 001F / 0020 38 400 +3.3% /1.4% 0014 / 0015
19 200 +0.2% /1.4% 0040 / 0041 19 200 +0.9% /1.4% 002A / 002B
9 600 +0.2% /0.6% 0081 / 0082 9 600 +0.9% /0.2% 0055 / 0056
4 800 +0.2% /0.2% 0103 / 0104 4 800 +0.4% /0.2% 00AC / 00AD
2 400 +0.2% /0.0% 0207 / 0208 2 400 +0.1% /0.2% 015A / 015B
1 200 0.1% / 0.0% 0410 / 0411 1 200 +0.1% /0.1% 02B5 / 02B6
600 0.0% / 0.0% 0822 / 0823 600 +0.1% /0.0% 056B / 056C
300 0.0% / 0.0% 1045 / 1046 300 0.0% / 0.0% 0AD8 / 0AD9
153 0.0% / 0.0% 1FE8 / 1FE9 102 0.0% / 0.0% 1FE8 / 1FE9
ST10F280 Serial channels
Doc ID 8673 Rev. 3 151/239
14.1.2 ASCO in synchronous mode
In synchronous mode, data are transmitted or received synchronously to a shift clock which
is generated by the ST10F280. Half-duplex communication up to 5M Baud (at 40MHz of
fCPU) is possible in this mode.
Figure 57. Synchronous mode of serial channel ASC0
Synchronous mode baud rates
For synchronous operation, the Baud rate generator provides a clock with 4 times the rate of
the established Baud rate. The Baud rate for synchronous operation of serial channel ASC0
can be determined by the following formula:
(S0BRL) represents the content of the reload register, taken as unsigned 13 Bit integers,
(S0BRS) represents the value of Bit S0BRS (‘0’ or ‘1’), taken as integer.
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Serial channels ST10F280
152/239 Doc ID 8673 Rev. 3
Using the above equation, the maximum Baud rate can be calculated for any clock speed as
given in Ta bl e 2 9 .
Note: The deviation errors given in the Ta bl e 2 9 are rounded. To avoid deviation errors use a Baud
rate crystal (providing a multiple of the ASC0/SSC sampling frequency)
14.2 Hi gh speed synchronou s serial channel (SSC)
The High-Speed Synchronous Serial Interface SSC provides flexible high-speed serial
communication between the ST10F280 and other microcontrollers, microprocessors or
external peripherals.
The SSC supports full-duplex and half-duplex synchronous communication. The serial clock
signal can be generated by the SSC itself (master mode) or be received from an external
master (slave mode). Data width, shift direction, clock polarity and phase are programmable.
This allows communication with SPI-compatible devices. Transmission and reception of data
is double-buffered. A 16-bit Baud rate generator provides the SSC with a separate serial
clock signal. The serial channel SSC has its own dedicated 16-bit Baud rate generator with
16-bit reload capability, allowing Baud rate generation independent from the timers.
Table 29. Commonly used baud rates by reload value and deviation errors
S0BRS = ‘0’, fCPU = 40MHz S0BRS = ‘1’, fCPU = 40MHz
Baud rate
(Baud) Deviation
error Reload value
(hexa) Baud rate
(Baud) Deviation
error Reload v alue
(hexa)
5 000 000 0.0% / 0.0% 0000 / 0000 3 333 333 0.0% / 0.0% 0000 / 0000
112 000 +1.5% /0.8% 002B / 002C 112 000 +2.6% /0.8% 001C / 001D
56 000 +0.3% /0.8% 0058 / 0059 56 000 +0.9% /0.8% 003A / 003B
38 400 +0.2% /0.6% 0081 / 0082 38 400 +0.9% /0.2% 0055 / 0056
19 200 +0.2% /0.2% 0103 / 0104 19 200 +0.4% /0.2% 00AC / 00AD
9 600 +0.2% /0.0% 0207 / 0208 9 600 +0.1% /0.2% 015A / 015B
4 800 +0.1% /0.0% 0410 / 0411 4 800 +0.1% /0.1% 02B5 / 02B6
2 400 0.0% / 0.0% 0822 / 0823 2 400 +0.1% /0.0% 056B / 056C
1 200 0.0% / 0.0% 1045 / 1046 1 200 0.0% / 0.0% 0AD8 / 0AD9
900 0.0% / 0.0% 15B2 / 15B3 600 0.0% / 0.0% 15B2 / 15B3
612 0.0% / 0.0% 1FE8 / 1FE9 407 0.0% / 0.0% 1FFD / 1FFE
ST10F280 Serial channels
Doc ID 8673 Rev. 3 153/239
Figure 58. Synchronous serial channel SSC block diagram
14.2.1 Baud rate generation
The Baud rate generator is clocked by fCPU/2. The timer is counting downwards and can be
started or stopped through the global enable Bit SSCEN in register SSCCON. Register
SSCBR is the dual-function Baud Rate Generator/Reload register. Reading SSCBR, while
the SSC is enabled, returns the content of the timer. Reading SSCBR, while the SSC is
disabled, returns the programmed reload value. In this mode the desired reload value can
be written to SSCBR.
Note: Never write to SSCBR, while the SSC is enabled.
The formulas below calculate the resulting Baud rate for a given reload value and the
required reload value for a given Baud rate:
(SSCBR) represents the content of the reload register, taken as unsigned 16 Bit integer.
Ta bl e 3 0 lists some possible Baud rates against the required reload values and the resulting
bit times for a 40MHz CPU clock.
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Table 30. Synchronous baud rate and reload values
Baud rate Bit time Reload value
Reserved use a reload value > 0. --- ---
10M Baud 100ns 0001h
5M Baud 200ns 0003h
2.5M Baud 400ns 0007h
1M Baud 1μs 0013h
100K Baud 10μs 00C7h
10K Baud 100μs07CFh
1K Baud 1ms 4E1Fh
306 Baud 3.26ms FF4Eh
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15 CAN modules
The two integrated CAN modules (CAN1 and CAN2) are identical and handle the
completely autonomous transmission and reception of CAN frames in accordance with the
CAN specification V2.0 part B (active) i.e. the on-chip CAN module can receive and transmit
standard frames with 11-bit identifiers as well as extended frames with 29-bit identifiers.
Because of duplication of CAN controllers, the following adjustements are to be considered:
●The same internal register addresses both CAN controllers, but with the base
addresses differing in address bit A8 and separate chip select for each CAN module.
For address mapping, see Chapter 4.
●The CAN1 transmit line (CAN1_TxD) is the alternate function of the port P4.6 and the
receive line (CAN1_RxD) is P4.5.
●The CAN2 transmit line (CAN2_TxD) is the alternate function of the port P4.7 and the
receive line (CAN2_RxD) is the alternate function of the port P4.4.
●Interrupt of CAN2 is connected to the XBUS interrupt line XP1 (CAN1 is on XP0).
●Because of the new XPERCON register, both CAN modules have to be selected,
before the bit XPEN is set in SYSCON register.
●After reset, the CAN1 is selected with the related control bit in the XPERCON register.
The CAN2 is not selected.
15.1 Memory mapping
15.1.1 CAN1
Address range 00’EF00h 00’EFFFh is reserved for the CAN1 Module access. The CAN1 is
enabled by setting bit 0 of the new XPERCON register before setting XPEN bit 2 of the
SYSCON register. Accesses to the CAN Module use demultiplexed addresses and a 16-bit
data bus (byte accesses are possible). Two waitstates give an access time of 100 ns at
40MHz CPU clock. No tristate waitstate is used.
15.1.2 CAN2
Address range 00’EE00h 00’EEFFh is reserved for the CAN2 Module access. The CAN2 is
enabled by setting XPEN bit 2 of the SYSCON register and bit 1 of the new XPERCON
register. Accesses to the CAN Module use demultiplexed addresses and a 16-bit data bus
(byte accesses are possible). Two waitstates give an access time of 100 ns at 40MHz CPU
clock. No tristate waitstate is used.
Note: If one or the two CAN modules are used, Port 4 can not be programmed to output all 8
segment address lines. Thus, only 4 segment address lines can be used, reducing the
external memory space to 5M Bytes (1M Byte per CS line).
15.2 CAN bus configurations
Depending on application, CAN bus configuration may be one single bus with a single or
multiple interfaces or a multiple bus with a single or multiple interfaces. The ST10F280 is
able to support these 2 cases.
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15.2.1 Single CAN bus
The single CAN Bus multiple interfaces configuration may be implemented using 2 CAN
transceives as shown in Figure 55.
Figure 59. Single CAN bus multiple interfaces - multiple transceivers
The ST10F280 also supports single CAN Bus multiple (dual) interfaces using the open drain
option of the CANx_TxD output as shown in Figure 60. Thanks to the OR-Wired
Connection, only one transceiver is required. In this case the design of the application must
take in account the wire length and the noise environment.
Figure 60. Single CAN bus dual interfaces - single transceiver
15.2.2 Multiple CAN bus
The ST10F280 provides 2 CAN interfaces to support the kind of bus configuration shown in
Figure 57.
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Figure 61. Connection to two different CAN buses (e.g. for gateway application)
15.3 Register and message object organization
All registers and message objects of the CAN controller are located in the special CAN
address area of 256 bytes, which is mapped into segment 0 and uses addresses 00’EE00h
through 00’EFFFh. All registers are organized as 16 bit registers, located on word
addresses. However, all registers may be accessed byte wise in order to select special
actions without effecting other mechanisms.
Note: The address map shown in Figure 58 lists the registers which are part of the CAN controller.
There are also ST10F280 specific registers that are associated with the CAN Module.
These registers, however, control the access to the CAN Module rather than its function.
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Figure 62. CAN module address map
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Control / S tatus Register
Address: 0xEF00h / 0xEE00h XReg
Reset: 0xXX01h
Type: R, R/W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
BOFF EWRN - RXOK TXOK LEC TST CCE 0 0 EIE SIE IE INIT
R R R/W R/W R/W R/W R/W R R R/W R/W R/W R/W
INIT Initialization
1: Software initialization of the CAN controller. While init is set, all message transfers are
stopped. Setting init does not change the configuration registers and does not stop
transmission or reception of a message in progress. The INIT bit is also set by hardware,
following a busoff condition; the CPU then needs to reset INIT to start the bus recovery
sequence.
0: Disable software initialization of the CAN controller; on INI completion, the CAN waits
for 11 consecutive recessive bit before taking part in bus activities.
IE Interrupt Enable Does not affect status updates.
1: Global interrupt enable from CAN module.
0: Global interrupt disable from CAN module.
SIE Status Change Interrupt Enable
1: Enables interrupt generation when a message transfer (reception or transmision is
successfully completed) or CAN bus error is detected and registered in LEC is the status
partition.
0: Disable status change interrupt.
EIE Error Interrupt Enable
1: Enables interrupt generation on a change of bit BOFF or EWARN in the status partition.
0: Disable error interrupt.
CCE Configuration Change Enable
1: Allows CPU access to the bit timing register
0: Disables CPU access to the bit timing register
TST Test Mode (Bit 7)
Make sure that bit 7 is cleared when writing to the Control Register. Writing a 1 during
normal operation may lead erroneous device behaviour.
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Note: Reading the upper half of the Control Register (status partition) will clear the Status Change
Interrupt value in the Interrupt Register, if it is pending. Use byte accesses to the lower half
to avoid this.
15.4 CAN interrupt handling
The on-chip CAN Module has one interrupt output, which is connected (through a
synchronization stage) to a standard interrupt node in the ST10F280 in the same manner as
all other interrupts of the standard on-chip peripherals. The control register for this interrupt
is XP0IC (located at address F186h/C3h for CAN1 and F18Eh/C7h for CAN2 in the ESFR
range). The associated interrupt vector is called XP0INT at location 100h (trap number 40h)
and XP1INT at location 104h (trap number 41h). With this configuration, the user has all
control options available for this interrupt, such as enabling/disabling, level and group
priority, and interrupt or PEC service (see note below).
LEC Last Error Code
This field holds a code which indicates the type of the last error occurred on the CAN bus.
If a message has been transferred (reception or transmission) without error, this field will
be cleared. Code “7” is unused and may be written by the CPU to check for updates.
0: No Error
1: Stuff Error: More than 5 equal bit in a sequence have occurred in a part of a received
message where this is not allowed.
2: Form Error: A fixed format part of a received frame has the wrong format.
3: AckError: The message this CAN controller transmitted was not acknowledged by
another node
4: Bit1Error: During the transmission of a message (with the exception of the arbitration
field), the device wanted to send a recessive level (“1”), but the monitored bus value was
dominant
5: Bit0Error: During the transmission of a message (or acknowledge bit, active error flag,
or overload flag), the device wanted to send a dominant level (“0”), but the monitored bus
value was recessive. During busoff recovery this status is set each time a sequence of 11
recessive bit has been monitored. This enables the CPU to monitor the proceeding of the
busoff recovery sequence (indicating the bus is not stuck at dominant or continuously
disturbed).
6: CRCError: The CRC check sum was incorrect in the message received.
TXOK Transmitted Message Successfully
Indicates that a message has been transmitted successfully (error free and acknowledged
by at least one other node), since this bit was last reset by the CPU (the CAN controller
does not reset this bit!).
RXOK Received Message Successfully
Indicates that a message has been received successfully, since this bit was last reset by
the CPU (the CAN controller does not reset this bit!).
EWRN Error Warning Status
Indicates that at least one of the error counters in the EML has reached the error warning
limit of 96.
BOFF Busoff Status
Indicates when the CAN controller is in busoff state (see EML).
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As for all other interrupts, the interrupt request flag XP0IR/XP1IR in register XP0IC/XP1IC is
cleared automatically by hardware when this interrupt is serviced (either by standard
interrupt or PEC service).
Note: As a rule, CAN interrupt requests can be serviced by a PEC channel. However, because
PEC channels only can execute single predefined data transfers (there are no conditional
PEC transfers), PEC service can only be used, if the respective request is known to be
generated by one specific source, and that no other interrupt request will be generated in
between. In practice this seems to be a rare case.
Since an interrupt request of the CAN Module can be generated due to different conditions,
the appropriate CAN interrupt status register must be read in the service routine to
determine the cause of the interrupt request. The Interrupt Identifier INTID (a number) in the
Interrupt Register indicates the cause of an interrupt. When no interrupt is pending, the
identifier will have the value 00h. If the value in INTID is not 00h, then there is an interrupt
pending. If bit IE in the Control Register is set, also the interrupt line to the CPU is activated.
The interrupt line remains active until either INTID gets 00h (after the interrupt requester has
been serviced) or until IE is reset (if interrupts are disabled).
The interrupt with the lowest number has the highest priority. If a higher priority interrupt
(lower number) occurs before the current interrupt is processed, INTID is updated and the
new interrupt overrides the last one. The Ta bl e 3 1 lists the valid values for INTID and their
corresponding interrupt sources.
Interrupt Register
Address: 0xEF02h / 0xEE02h XReg
Reset: 0x--XXh
Type: R
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Reserved INTID
R
INTID Interrupt Identifier
This number indicates the cause of the interrupt. When no interrupt is pending, the value will
be “00”.
Table 31. INTID values and corresponding interrupt sources
INTID Cause of the Interrupt
00 Interrupt Idle: There is no interrupt request pending.
01
Status Change Interrupt: The CAN controller has updated (not necessarily changed) the
status in the Control Register. This can refer to a change of the error status of the CAN
controller (EIE is set and BOFF or EWRN change) or to a CAN transfer incident (SIE must
be set), like reception or transmission of a message (RXOK or TXOK is set) or the
occurrence of a CAN bus error (LEC is updated). The CPU may clear RXOK, TXOK, and
LEC, however, writing to the status partition of the Control Register can never generate or
reset an interrupt. To update the INTID value the status partition of the Control Register
must be read.
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15.4.1 Bit timing co nfiguration
According to the CAN protocol specification, a bit time is subdivided into four segments:
Sync segment, propagation time segment, phase buffer segment 1 and phase buffer
segment 2.
Each segment is a multiple of the time quantum tq with tq = ( BRP + 1 ) x2 xt
XCLK
The Synchronization Segment (Sync seg) is always 1 tq long. The Propagation Time
Segment and the Phase Buffer Segment1 (combined to Tseg1) defines the time before the
sample point, while Phase Buffer Segment2 (Tseg2) defines the time after the sample point.
The length of these segments is programmable (except Sync-Seg).
Note: For exact definition of these segments please refer to the CAN Specification.
Figure 63. Bit timing definition
02
Message 15 Interrupt: Bit INTPND in the Message Control Register of message object 15
(last message) has been set. The last message object has the highest interrupt priority of
all message objects. 1) (1)
(2+N) Message N Interrupt: Bit INTPND in the Message Control Register of message object ‘N’
has been set (N = 1...14). (1)(2)
1. Bit INTPND of the corresponding message object has to be cleared to give messages with a lower priority
the possibility to update INTID or to reset INTID to 00h (idle state).
2. A message interrupt code is only displayed, if there is no other interrupt request with a higher priority.
Table 31. INTID values and corresponding interrupt sources (continued)
INTID Cause of the Interrupt
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Bit Timing Register
Address: 0xEF04h / EE04h XReg
Reset: 0xUUUUh
Type: R, R/W
Note: This register can only be written, if the configuration change enable bit (CCE) is set.
15.4.2 Mask registers
Messages can use standard or extended identifiers. Incoming frames are masked with their
appropriate global masks. Bit IDE of the incoming message determines whether the
standard 11 bit mask in Global Mask Short or the 29 bit extended mask in Global Mask Long
is to be used. Bit holding a “0” mean “don’t care”, so do not compare the message’s
identifier in the respective bit position.
The last message object (15) has an additional individually programmable acceptance mask
(Mask of Last Message) for the complete arbitration field. This allows classes of messages
to be received in this object by masking some bits of the identifier.
Note: The Mask of Last Message is ANDed with the Global Mask that corresponds to the
incoming message.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 TSEG2 TSEG1 SJW BRP
R R/W R/W R/W R/W
BRP Baud Rate Prescaler
For generating the bit time quanta the CPU frequency is divided by 2 x (BRP+1).
SJW (Re)Synchronization Jump Width
Adjust the bit time by maximum (SJW+1) time quanta for re-synchronization.
TSEG1 Time Segment before sample point
There are (TSEG1+1) time quanta before the sample point. Valid values for TSEG1
are “2...15”.
TSEG2 Time Segment after sample point
There are (TSEG2+1) time quanta after the sample point. Valid values for TSEG2 are
“1...7”.
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Global Mask Short
Address: 0xEF06h / EE06h XReg
Reset: 0xUFUUh
Type: R, R/W
Upper Global Mask Long
Address: 0xEF08h / EE08h XReg
Reset: 0xUUUUh
Type: R/W
Lower Global Mask Long
Address: 0xEF0Ah / EE0Ah XReg
Reset: 0xUUUUh
Type: R, R/W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
ID20...18 1 1 1 1 1 ID28...21
R/W RRRRR R/W
ID28...18 Identifier (11 Bit)
Mask to filter incoming messages with standard identifier.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
ID20...13 ID28...21
R/W R/W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
ID4...0 0 0 0 ID12...5
R/W R R R R/W
ID28...0 Identifier (29 bit)
Mask to filter incoming messages with extended identifier.
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Upper Mask of Last Message
Address: 0xEF0Ch / EE0Ch XReg
Reset: 0xUUUUh
Type: R/W
Lower Mask of Last Message
Address: 0xEF0Eh / EE0Eh XReg
Reset: 0xUUUUh
Type: R, R/W
15.5 The message object
The message object is the primary means of communication between CPU and CAN
controller. Each of the 15 message objects uses 15 consecutive bytes (see Figure 60) and
starts at an address that is a multiple of 16.
Note: All message objects must be initialized by the CPU, even those which are not going to be
used, before clearing the INIT bit.
Each element of the Message Control Register is made of two complementary bits.
This special mechanism allows the selective setting or resetting of specific elements
(leaving others unchanged) without requiring read-modify-write cycles. None of these
elements will be affected by reset.
The Tab le 32 shows how to use and to interpret these 2 bit-fields.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
ID20...18 ID17...13 ID28...21
R/W R/W R/W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
ID4...0 0 0 0 ID12...5
R/W R R R R/W
ID28...0 Identifier (29 bit)
Mask to filter the last incoming message (Nr. 15) with standard or extended identifier (as
configured).
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Figure 64. Message object address map
Table 32. Functions of complementary bit of message control register
Value Function on write Meaning on read
0 0 Reserved Reserved
0 1 Reset element Element is reset
1 0 Set element Element is set
1 1 Leave element unchanged Reserved
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Message Control Register
Address: 0xEFn0h / EEn0h XReg
Reset: 0xUUUUh
Type: R/W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
RMTPND TXRQ MSGLST
CPUUPD NEWDAT MSGVAL TXIE RXIE INTPND
R/W R/W R/W R/W R/W R/W R/W R/W
INTPND Interrupt Pending
Indicates, if this message object has generated an interrupt request (see TXIE and
RXIE), since this bit was last reset by the CPU, or not.
RXIE Receive Interrupt Enable
Defines, if bit INTPND is set after successful reception of a frame.
TXIE Transmit Interrupt Enable
Defines, if bit INTPND is set after successful transmission of a frame.(1)
1. In message object 15 (last message) these bits are hardwired to “0” (inactive) in order to prevent
transmission of message 15.
MSGVAL Message Valid
Indicates, if the corresponding message object is valid or not. The CAN controller only
operates on valid objects. Message objects can be tagged invalid, while they are
changed, or if they are not used at all.
NEWDAT New Data
Indicates, if new data has been written into the data portion of this message object by
CPU (transmit-objects) or CAN controller (receive-objects) since this bit was last
reset, or not.(2)
2. When the CAN controller writes new data into the message object, unused message bytes will be
overwritten by non specified values. Usually the CPU will clear this bit before working on the data, and
verify that the bit is still cleared once it has finished working to ensure that it has worked on a consistent set
of data and not part of an old message and part of the new message.
For transmit-objects the CPU will set this bit along with clearing bit CPUUPD. This will ensure that, if the
message is actually being transmitted during the time the message was being updated by the CPU, the
CAN controller will not reset bit TXRQ. In this way bit TXRQ is only reset once the actual data has been
transferred.
MSGLST
(Receive)
Message Lost (This bit applies to receive-objects only)
Indicates that the CAN controller has stored a new message into this object, while
NEWDAT was still set, i.e. the previously stored message is lost.
CPUUPD
(Transmit)
CPU Update (This bit applies to transmit-objects only)
Indicates that the corresponding message object may not be transmitted now. The
CPU sets this bit in order to inhibit the transmission of a message that is currently
updated, or to control the automatic response to remote requests.
TXRQ Transmit Request
Indicates that the transmission of this message object is requested by the CPU or via
a remote frame and is not yet done. TXRQ can be disabled by CPUUPD. (1) (3)
RMTPND Remote Pending (Used for transmit-objects)
Indicates that the transmission of this message object has been requested by a
remote node, but the data has not yet been transmitted. When RMTPND is set, the
CAN controller also sets TXRQ. RMTPND and TXRQ are cleared, when the message
object has been successfully transmitted.
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15.6 Arbitration Registers
The arbitration Registers are used for acceptance filtering of incoming messages and to
define the identifier of outgoing messages.
Upper Arbitrati on Reg
Address: 0xEFn2h / EEn2h XReg
Reset: 0xUUUUh
Type: R/W
Lower Arbitrati on Reg
Address: 0xEFn4h / EEn4h XReg
Reset: 0xUUUUh
Type: R, R/W
3. When the CPU requests the transmission of a receive-object, a remote frame will be sent instead of a data
frame to request a remote node to send the corresponding data frame. This bit will be cleared by the CAN
controller along with bit RMTPND when the message has been successfully transmitted, if bit NEWDAT
has not been set. If there are several valid message objects with pending transmission request, the
message with the lowest message number is transmitted first.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
ID20...18 ID17...13 ID28...21
R/W R/W R/W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
ID4...0 0 0 0 ID12...5
R/W R R R R/W
ID28...0 Identifier (29 bit) Identifier of a standard message (ID28...18) or an extended
message (ID28...0). For standard identifiers bit ID17...0 are “don’t care”.
ST10F280 Watchdog timer
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16 Watchdog timer
The Watchdog Timer is a fail-safe mechanism which prevents the microcontroller from
malfunctioning for long periods of time.
The Watchdog Timer is always enabled after a reset of the chip and can only be disabled in
the time interval until the EINIT (end of initialization) instruction has been executed.
Therefore, the chip start-up procedure is always monitored. The software must be designed
to service the watchdog timer before it overflows. If, due to hardware or software related
failures, the software fails to do so, the watchdog timer overflows and generates an internal
hardware reset. It pulls the RSTOUT pin low in order to allow external hardware components
to be reset.
Each of the different reset sources is indicated in the WDTCON register.
The indicated bit are cleared with the EINIT instruction. The origine of the reset can be
identified during the initialization phase.
WDTCON
Address: 0xFFAEh / D7h SFR
Reset: 0x00XXh
Type: R, R/W
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WDTREL - - PONR LHWR SHWR SWR WDTR WDTIN
R/W RRRRR R/W
WDTIN Watchdog Timer Input Frequency Selection
0: Input Frequency is fCPU/2.
1: Input Frequency is fCPU/128.
WDTR(1)
1. More than one reset indication flag may be set. After EINIT, all flags are cleared.
Watchdog Timer Reset Indication Flag
Set by the watchdog timer on an overflow.
Cleared by a hardware reset or by the SRVWDT instruction.
SWR(1) Software Reset Indication Flag
Set by the SRST execution.
Cleared by the EINIT instruction.
SHWR(1) Short Hardware Reset Indication Flag
Set by the input RSTIN.
Cleared by the EINIT instruction.
LHWR(1) Long Hardware Reset Indication Flag
Set by the input RSTIN.
Cleared by the EINIT instruction.
PONR(1)(2)
2. Power-on is detected when a rising edge from Vcc = 0 V to Vcc > 2.0 V is recognized.
Power-On (Asynchronous) Reset Indication Flag
Set by the input RSTIN if a power-on condition has been detected.
Cleared by the EINIT instruction.
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The PONR flag of WDTCON register is set if the output voltage of the internal 3.3V supply
falls below the threshold (typically 2V) of the power-on detection circuit. This circuit is
efficient to detect major failures of the external 5V supply but if the internal 3.3V supply does
not drop under 2 volts, the PONR flag is not set. This could be the case on fast switch-off /
switch-on of the 5V supply. The time needed for such a sequence to activate the PONR flag
depends on the value of the capacitors connected to the supply and on the exact value of
the internal threshold of the detection circuit.
Note: 1. PONR bit may not be set for short supply failure.
Note: 2. For power-on reset and reset after supply partial failure, asynchronous reset must be
used.
In case of bi-directional reset is enabled, and if the RSTIN pin is latched low after the end of
the internal reset sequence, then a Short hardware reset, a software reset or a watchdog
reset will trigger a Long hardware reset. Thus, Reset Indications flags will be set to indicate
a Long Hardware Reset.
The Watchdog Timer is 16-bit, clocked with the system clock divided by 2 or 128. The high
Byte of the watchdog timer register can be set to a pre-specified reload value (stored in
WDTREL).
Each time it is serviced by the application software, the high byte of the watchdog timer is
reloaded. For security, rewrite WDTCON each time before the watchdog timer is serviced
The Tab le 34 shows the watchdog time range for 40MHz CPU clock.
The watchdog timer period is calculated with the following formula:
Table 33. WDTC ON bits value on different resets
Reset source PONR LHWR SHWR SWR WDTR
Power On Reset XXXX
Power on after partial supply
failure 1XXX
Long Hardware Reset X X X
Short Hardware Reset X X
Software Reset X
Watchdog Reset X X
Table 34. WDTREL reload value
Reload value in WDTREL Prescaler for fCPU = 40 MHz
2 (WDTIN = ‘0’) 128 (WDTIN = ‘1’)
FFh 12.8μs819.2ms
00h 3.276ms 209.7ms
PWDT
1
fCPU
---------------512×1WDTIN]63 )256 WDTREL ])[–(××[+(×=
ST10F280 System reset
Doc ID 8673 Rev. 3 171/239
17 System reset
System reset initializes the MCU in a predefined state. There are five ways to activate a
reset state. The system start-up configuration is different for each case as shown in
Ta bl e 3 5 .
17.1 Asynchronous reset (long hardware reset)
An asynchronous reset is triggered when RSTIN pin is pulled low while RPD pin is at low
level. Then the MCU is immediately forced in reset default state. It pulls low RSTOUT pin, it
cancels pending internal hold states if any, it waits for any internal access cycles to finish, it
aborts external bus cycle, it switches buses (data, address and control signals) and I/O pin
drivers to high-impedance, it pulls high PORT0 pins and the reset sequence starts.
17.1.1 Power-on reset
The asynchronous reset must be used during the power-on of the MCU. Depending on
crystal frequency, the on-chip oscillator needs about 10ms to 50ms to stabilize. The logic of
the MCU does not need a stabilized clock signal to detect an asynchronous reset, so it is
suitable for power-on conditions. To ensure a proper reset sequence, the
RSTIN
pin and the
RPD pin must be held at low level until the MCU clock signal is stabilized and the system
configuration value on PORT0 is settled.
17.1.2 Hardware reset
The asynchronous reset must be used to recover from catastrophic situations of the
application. It may be triggerred by the hardware of the application. Internal hardware logic
and application circuitry are described in Reset circuitry chapter and Figure 68, Figure 69
and Figure 66.
17.1.3 Exit of asynchronous reset state
When the RSTIN pin is pulled high, the MCU restarts. The system configuration is latched
from PORT0 and ALE, RD and R/W pins are driven to their inactive level. The MCU starts
program execution from memory location 00'0000h in code segment 0. This starting location
will typically point to the general initialization routine. Timing of asynchronous reset
sequence are summarized in Figure 61.
Table 35. Reset event definition
Reset source Short-cut Conditions
Power-on reset PONR Power-on
Long Hardware reset (synchronous & asynchronous) LHWR t RSTIN > 1032 TCL
Short Hardware reset (synchronous reset) SHWR 4 TCL < t RSTIN < 1032 TCL
Watchdog Timer reset WDTR WDT overflow
Software reset SWR SRST execution
System reset ST10F280
172/239 Doc ID 8673 Rev. 3
Figure 65. Asynchronous reset timing
Note: 1. RSTIN rising edge to internal latch of PORT0 is 3 CPU clock cycles (6 TCL) if the PLL is
bypassed and the prescaler is on (fCPU =f
XTAL / 2), else it is 4 CPU clock cycles (8 TCL) .
17.2 Synchronous reset (warm reset)
A synchronous reset is triggered when
RSTIN
pin is pulled low while RPD pin is at high
level. In order to properly activate the internal reset logic of the MCU, the
RSTIN
pin must be
held low, at least, during 4 TCL (2 periods of CPU clock). The I/O pins are set to high
impedance and
RSTOUT
pin is driven low. After
RSTIN
level is detected, a short duration of
12 TCL (approximately 6 periods of CPU clock) elapes, during which pending internal hold
states are cancelled and the current internal access cycle if any is completed. External bus
cycle is aborted. The internal pull-down of
RSTIN
pin is activated if bit BDRSTEN of
SYSCON register was previously set by software. This bit is always cleared on power-on or
after a reset sequence.
17.2.1 Exit of synchronous reset state
The internal reset sequence starts for 1024 TCL (512 periods of CPU clock) and
RSTIN
pin
level is sampled. The reset sequence is extended until
RSTIN
level becomes high. Then, the
MCU restarts. The system configuration is latched from PORT0 and ALE, RD and
R/W
pins
are driven to their inactive level. The MCU starts program execution from memory location
00'0000h in code segment 0. This starting location will typically point to the general
initialization routine. Timing of synchronous reset sequence are summarized in Figure 66
and Figure 67.
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ST10F280 System reset
Doc ID 8673 Rev. 3 173/239
Figure 66. Synchronous warm reset (short low pulse on
RSTIN)
1. RSTIN assertion can be released there.
2. If during the reset condition (RSTIN low), VRPD voltage drops below the threshold voltage (about 2.5V for
5V operation), the asynchronous reset is then immediately entered.
3. RSTIN rising edge to internal latch of PORT0 is 3 CPU clock cycles (6 TCL) if the PLL is bypassed and the
prescaler is on (fCPU =f
XTAL / 2), else it is 4 CPU clock cycles (8 TCL).
4. RSTIN pin is pulled low if bit BDRSTEN (bit 5 of SYSCON register) was previously set by software. Bit
BDRSTEN is cleared after reset.
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System reset ST10F280
174/239 Doc ID 8673 Rev. 3
Figure 67. Synchronous warm reset (long low pulse on
RSTIN
)
1. RSTIN rising edge to internal latch of PORT0 is 3 CPU (6 TCL) clock cycles if the PLL is bypassed and the
prescaler is on (fCPU = fXTAL / 2), else it is 4 CPU clock cycles (8 TCL).
2. If during the reset condition (RSTIN low), VRPD voltage drops below the threshold voltage (about 2.5V for
5V operation), the asynchronous reset is then immediately entered.
3. RSTIN pin is pulled low if bit BDRSTEN (bit 5 of SYSCON register) was previously set by soft-ware. Bit
BDRSTEN is cleared after reset.
17.3 Software reset
The reset sequence can be triggered at any time using the protected instruction SRST
(software reset). This instruction can be executed deliberately within a program, for example
to leave bootstrap loader mode, or upon a hardware trap that reveals a system failure.
Upon execution of the SRST instruction, the internal reset sequence (1024 TCL) is started.
The microcontroller behaviour is the same as for a Short Hardware reset, except that only
P0.12...P0.6 bit are latched at the end of the reset sequence, while P0.5...P0.2 bit are
cleared.
17.4 Watchdog timer reset
When the watchdog timer is not disabled during the initialization or when it is not regularly
serviced during program execution it will overflow and it will trigger the reset sequence.
Unlike hardware and software resets, the watchdog reset completes a running external bus
cycle if this bus cycle either does not use READY
, or if READY is sampled active (low) after
the programmed wait states. When READY is sampled inactive (high) after the programmed
wait states the running external bus cycle is aborted. Then the internal reset sequence is
started. At the end of the internal reset sequence (1024 TCL), only P0.12...P0.6 bit are
latched, while previously latched values of P0.5...P0.2 are cleared.
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ST10F280 System reset
Doc ID 8673 Rev. 3 175/239
17.5 RSTOUT pin and bidirectional reset
The RSTOUT pin is driven active (low level) at the beginning of any reset sequence
(synchronous/asynchronous hardware, software and watchdog timer resets). RSTOUT pin
stays active low beyond the end of the initialization routine, until the protected EINIT
instruction (End of Initialization) is completed.
The Bidirectional Reset function is useful when external devices require a reset signal but
cannot be connected to RSTOUT pin, because RSTOUT signal lasts during initialisation. It
is, for instance, the case of external memory running initialization routine before the
execution of EINIT instruction.
Bidirectional reset function is enabled by setting bit 3 (BDRSTEN) in SYSCON register. It
only can be enabled during the initialization routine, before EINIT instruction is completed.
When enabled, the open drain of the RSTIN pin is activated, pulling down the reset signal,
for the duration of the internal reset sequence (synchronous/asynchronous hardware,
software and watchdog timer resets). At the end of the internal reset sequence the pull
down is released and the RSTIN pin is sampled 8 TCL periods later.
●If signal is sampled low, a hardware reset is triggered again.
●If it is sampled high, the chip exits reset state according to the running reset way
(synchronous/asynchronous hardware, software and watchdog timer resets ).
Note: The bidirectional reset function is disabled by any reset sequence (Bit BDRSTEN of
SYSCON is cleared). To be activated again it must be enabled during the initialization
routine.
17.6 Reset circuitry
The internal reset circuitry is described in Figure 68.
An internal pull-up resistor is implemented on RSTIN pin. (50kΩ minimum, to 250kΩ
maximum). The minimum reset time must be calculated using the lowest value. In addition,
a programmable pull-down (bit BDRSTEN of SYSCON register) drives the RSTIN pin
according to the internal reset state as explained in Section 17.5: RSTOUT pin and
bidirectional reset.
The RSTOUT pin provides a signals to the application as described in Section 17.5:
RSTOUT pin and bidirectional reset.
A weak internal pull-down is connected to the RPD pin to discharge external capacitor to
Vss at a rate of 100μA to 200μA. This Pull-down is turned on when RSTIN pin is low
If bit PWDCFG of SYSCON register is set, an internal pull-up resistor is activated at the end
of the reset sequence. This pull-up charges the capacitor connected to RPD pin.
If Bidirectional Reset function is not used, the simplest way to reset ST10F280 is to connect
external components as shown in Figure 69. It works with reset from application (hardware
or manual) and with power-on. The value of C1 capacitor, connected on RSTIN pin with
internal pull-up resistor (50kΩ to 250kΩ), must lead to a charging time long enough to let the
internal or external oscillator and / or the on-chip PLL to stabilize.
The R0-C0 components on RPD pin are mainly implemented to provide a time delay to exit
Power down mode (see Chapter 18: Power reduction modes). Nervertheless, they drive
RPD pin level during resets and they lead to different reset modes as explained hereafter.
On power-on, C0 is totaly discharged, a low level on RPD pin forces an asynchronous
System reset ST10F280
176/239 Doc ID 8673 Rev. 3
hardware reset. C0 capacitor starts to charge throught R0 and at the end of reset sequence
ST10F280 restarts. RPD pin threshold is typically 2.5V.
Depending on the delay of the next applied reset, the MCU can enter a synchronous reset or
an asynchronous reset. If RPD pin is below 2.5V an asynchronous reset starts, if RPD pin is
above 2.5V a synchronous reset starts. (see Section 17.1: Asynchronous reset (long
hardware reset) and Section 17.2: Synchronous reset (warm reset)).
Note that an internal pull-down is connected to RPD pin and can drive a 100μA to 200μA
current. This Pull-down is turned on when RSTIN pin is low.
In order to properly use the Bidirectional reset features, the schematic (or equivalent) of
Figure 66 must be implemented. R1-C1 only work for power-on or manual reset in the same
way as explained previously. D1 diode brings a faster discharge of C1 capacitor at power-off
during repetitive switch-on / switch-off sequences. D2 diode performs an OR-wired
connection, it can be replaced with an open drain buffer. R2 resistor may be added to
increase the pull-up current to the open drain in order to get a faster rise time on RSTIN pin
when bidirectional function is activated.
The start-up configurations and some system features are selected on reset sequences as
described in Ta ble and Ta bl e 3 7 .
Ta bl e 3 6 describes what is the system configuration latched on PORT0 in the five different
reset ways. Ta bl e 3 7 summarizes the bit state of PORT0 latched in RP0H, SYSCON,
BUSCON0 registers. RPOH register is described in Section 19.2: System configuration
registers.
ST10F280 System reset
Doc ID 8673 Rev. 3 177/239
Figure 68. Internal (simplified) reset circuitry
Figure 69. Minimum external reset circuitry
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System reset ST10F280
178/239 Doc ID 8673 Rev. 3
Figure 70. External reset hardware circ uitry
Table 36. PORT0 latched configuration for the different resets
X : Pin is sampled
- : Pin is no t
sampled
PORT0
Clock Options
Segm. Addr. Lines
Chip Selects
WR config.
Bus Type
Reserved
BSL
Reserved
Reserved
Adapt Mode
Emu Mode
Sample event
P0H.7
P0H.6
P0H.5
P0H.4
P0H.3
P0H.2
P0H.1
P0H.0
P0L.7
P0L.6
P0L.5
P0L.4
P0L.3
P0L.2
P0L.1
P0L.0
Software Reset - - - XXXXXXX ------
Watchdog Reset - - - XXXXXXX ------
Short Hardware
Reset - - - XXXXXXXXXXXXX
Long Hardware
Reset XXXXXXXXXXXXXXXX
Power-On Reset XXXXXXXXXXXXXXXX
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ST10F280 System reset
Doc ID 8673 Rev. 3 179/239
Table 37. PORT0 bit latched into the d ifferent registers after reset
PORT0
bit
nber h7 h6 h5 h4 h3 h2 h1 h0 I7 I6 I5 I4 I3 I2 I1 I0
PORT0
bit
Name
CLKCFG
CLKCFG
CLKCFG
SALSEL
SALSEL
CSSEL
CSSEL
WRC
BUSTYP
BUSTYP
R
BSL
RR
ADP
EMU
RP0H
(1) X(2) X(2) X(2) X(2) X(2) X(2) X(2) X(2)
CLKCFG
CLKCFG
CLKCFG
SALSEL
SALSEL
CSSEL
CSSEL
WRC
SYSCON
X(2) X(2) X(2) X(2) X(2) X(2)
BYTDIS (3)
X(2)
WRCFG (3)
X(2) X(2) X(2) X(2) X(2) X(2) X(2)
BUSCON0
X(2) X(2) X(2) X(2) -
BUS ACT0 (4)
ALE CTL0 (4)
-
BTYP
BTYP
X(2) X(2) X(2) X(2) X(2) X(2)
Internal
logic
To c l o ck
generator
To Po r t 4
logic
To Por t 6
logic X(2) X(2) X(2) X(2)
Internal
X(2) X(2)
Internal
Internal
1. Only RP0H low byte is used and the bit-fields are latched from PORT0 high byte to RP0H low byte.
2. Not latched from PORT0.
3. Indirectly depend on PORT0.
4. Bits set if EA pin is 1.
Power reduct ion modes ST10F280
180/239 Doc ID 8673 Rev. 3
18 Power reduction modes
Two different power reduction modes with different levels of power reduction have been
implemented in the ST10F280, which may be entered under software control.
In Idle mode the CPU is stopped, while the peripherals continue their operation. Idle mode
can be terminated by any reset or interrupt request.
In Power Down mode both the CPU and the peripherals are stopped. Power Down mode
can now be configured by software in order to be terminated only by a hardware reset or by
a transition on enabled fast external interrupt pins.
Note: All external bus actions are completed before Idle or Power Down mode is entered.
However, Idle or Power Down mode is not entered if READY is enabled, but has not been
activated (driven low for negative polarity, or driven high for positive polarity) during the last
bus access.
18.1 Idle mode
Idle mode is entered by running IDLE protected instruction. The CPU operation is stopped
and the peripherals still run.
Idle mode is terminate by any interrupt request. Whatever the interrupt is serviced or not,
the instruction following the IDLE instruction will be executed after return from interrupt
(RETI) instruction, then the CPU resumes the normal program.
Note that a PEC transfer keeps the CPU in Idle mode. If the PEC transfer does not succeed,
the Idle mode is terminated. Watchdog timer must be properly programmed to avoid any
disturbance during Idle mode.
18.2 Power down mode
Power Down mode starts by running PWRDN protected instruction. Internal clock is
stopped, all MCU parts are on hold including the watchdog timer.
There are two different operating Power Down modes: protected mode and interruptible
mode. The internal RAM contents can be preserved through the voltage supplied via the
VDD pins. To verify RAM integrity, some dedicated patterns may be written before entering
the Power Down mode and have to be checked after Power Down is resumed.
It is mandatory to keep VDD = +5V ±10% during power-down mode, because the on-chip
voltage regulator is turned in power saving mode and it delivers 2.5V to the core logic, but it
must be supplied at nominal VDD = +5V.
ST10F280 Power reduction modes
Doc ID 8673 Rev. 3 181/239
SYSCON
Address: 0xFF12H / 89h SFR
Reset: 0x0XX0h
Type: R/W
Note: Register SYSCON cannot be changed after execution of the EINIT instruction.
18.2.1 Protected power down mode
This mode is selected by clearing the bit PWDCFG in register SYSCON to ‘0’.
In this mode, the Power Down mode can only be entered if the NMI (Non Maskable
Interrupt) pin is externally pulled low while the PWRDN instruction is executed.
This feature can be used in conjunction with an external power failure signal which pulls the
NMI pin low when a power failure is imminent. The microcontroller will enter the NMI trap
routine which can save the internal state into RAM. After the internal state has been saved,
the trap routine may set a flag or write a certain bit pattern into specific RAM locations, and
then execute the PWRDN instruction. If the NMI pin is still low at this time, Power Down
mode will be entered, otherwise program execution continues. During power down the
voltage delivered by the on-chip voltage regulator automatically lowers the internal logic
supply down to 2.5 V, saving the power while the contents of the internal RAM and all
registers will still be preserved.
Exiting power down mode
In this mode, the only way to exit Power Down mode is with an external hardware reset.
The initialization routine (executed upon reset) can check the identification flag or bit pattern
within RAM to determine whether the controller was initially switched on, or whether it was
properly restarted from Power Down mode.
18.2.2 Interruptable power down mode
This mode is selected by setting the bit PWDCFG in register SYSCON to ‘1’.
151413121110987654321 0
STKSZ
ROMS1
SGTDIS
ROMEN
BYTDIS
CLKEN
WRCFG
CSCFG
PWDCFG
OWDDIS
BDRSTEN
XPEN
VISIBLE
XPER-SHARE
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
PWDCFG Power Down Mode Configuration Control
0: Power Down Mode can only be entered during PWRDN instruction execution if NMI pin
is low, otherwise the instruction has no effect. To exit Power Down Mode, an external reset
must occurs by asserting the RSTIN pin.
1: Power Down Mode can only be entered during PWRDN instruction execution if all
enabled FastExternal Interrupt (EXxIN) pins are in their inactive level. Exiting this mode
can be done by asserting one enabled EXxIN pin.
Power reduct ion modes ST10F280
182/239 Doc ID 8673 Rev. 3
In this mode, the Power Down mode can be entered if enabled Fast External Interrupt pins
(EXxIN pins, alternate functions of Port 2 pins, with x = 7...0) are in their inactive level. This
inactive level is configured with the EXIxES bit field in the EXICON register, as follow:
EXICON (F1C0h / E0h)
Address: 0xF1C0H / E0h ESFR
Reset: 0x000h
Type: R/W
Exiting power down mode
When Power Down mode is entered, the CPU and peripheral clocks are frozen, and the
oscillator and PLL are stopped. Power Down mode can be exited by either asserting RSTIN
or one of the enabled EXxIN pin (Fast External Interrupt).
RSTIN must be held low until the oscillator and PLL have stabilized.
EXxIN inputs are normally sampled interrupt inputs. However, the Power Down mode
circuitry uses them as level-sensitive inputs. An EXxIN (x = 7...0) Interrupt Enable bit (bit
CCxIE in respective CCxIC register) need not to be set to bring the device out of Power
Down mode. An external RC circuit must be connected, as shown in the following figure:
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
EXI7ES EXI6ES EXI5ES EXI4ES EXI3ES EXI2ES EXI1ES EXI0ES
R/W R/W R/W R/W R/W R/W R/W R/W
EXIxES (x=7...0) External Interrupt x Edge Selection Field (x=7...0)
00: Fast external interrupts disabled: standard mode
EXxIN pin not taken in account for entering/exiting Power Down mode.
Interrupt on positive edge (rising)
01: Enter Power Down mode if EXiIN = ‘0’, exit if EXxIN = ‘1’ (referred as ‘high’
active level)
10: Interrupt on negative edge (falling)
Enter Power Down mode if EXiIN = ‘1’, exit if EXxIN = ‘0’ (referred as ‘low’ active
level)
11: Interrupt on any edge (rising or falling)
Always enter Power Down mode, exit if EXxIN level changed.
ST10F280 Power reduction modes
Doc ID 8673 Rev. 3 183/239
Figure 71. External RC circuit on RPD pin for exiting power down mode with
external interrupt
To exit Power Down mode with external interrupt, an EXxIN pin has to be asserted for at
least 40 ns (x = 7...0). This signal enables the internal oscillator and PLL circuitry, and also
turns on the weak pull-down (see following figure). The discharging of the external capacitor
provides a delay that allows the oscillator and PLL circuits to stabilize before the internal
CPU and Peripheral clocks are enabled. When the Vpp voltage drops below the threshold
voltage (about 2.5 V), the Schmitt trigger clears Q2 flip-flop, thus enabling the CPU and
Peripheral clocks, and the device resumes code execution.
If the Interrupt was enabled (bit CCxIE=’1’ in the respective CCxIC register) before entering
Power Down mode, the device executes the interrupt service routine, and then resumes
execution after the PWRDN instruction (see note below). If the interrupt was disabled, the
device executes the instruction following PWRDN instruction, and the Interrupt Request
Flag (bit CCxIR in the respective CCxIC register) remains set until it is cleared by software.
Note: Due to internal pipeline, the instruction that follows the PWRDN instruction is executed
before the CPU performs a call of the interrupt service routine when exiting power-down
mode.
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Power reduct ion modes ST10F280
184/239 Doc ID 8673 Rev. 3
Figure 72. Simplified power down exit circuitry
Figure 73. Power down exit sequence when using an external interrupt (PLL x 2)
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ST10F280 Special function register overview
Doc ID 8673 Rev. 3 185/239
19 Special function register overview
The following table lists all SFRs which are implemented in the ST10F280 in alphabetical
order. Bit-addressable SFRs are marked with the letter “b” in column “Name”. SFRs within
the Extended SFR-Space (ESFRs) are marked with the letter “E” in column “Physical
Address”.
An SFR can be specified by its individual mnemonic name. Depending on the selected
addressing mode, an SFR can be accessed via its physical address (using the Data Page
Pointers), or via its short 8-bit address (without using the Data Page Pointers).
The reset value is defined as following:
X: Means the full nibble is not defined at reset.
x: Means some bit of the nibble are not defined at reset.
Table 38. Special function register s listed by name
Name Physical
address 8-bit
address Description Reset
value
ADCIC b FF98h CCh A/D Converter end of Conversion Interrupt
Control Register
- - 00h
ADCON b FFA0h D0h A/D Converter Control Register 0000h
ADDAT FEA0h 50h A/D Converter Result Register 0000h
ADDAT2 F0A0h E 50h A/D Converter 2 Result Register 0000h
ADDRSEL1 FE18h 0Ch Address Select Register 1 0000h
ADDRSEL2 FE1Ah 0Dh Address Select Register 2 0000h
ADDRSEL3 FE1Ch 0Eh Address Select Register 3 0000h
ADDRSEL4 FE1Eh 0Fh Address Select Register 4 0000h
ADEIC b FF9Ah CDh A/D Converter Overrun Error Interrupt Control
Register
- - 00h
BUSCON0 b FF0Ch 86h Bus Configuration Register 0 0xx0h
BUSCON1 b FF14h 8Ah Bus Configuration Register 1 0000h
BUSCON2 b FF16h 8Bh Bus Configuration Register 2 0000h
BUSCON3 b FF18h 8Ch Bus Configuration Register 3 0000h
BUSCON4 b FF1Ah 8Dh Bus Configuration Register 4 0000h
CAPREL FE4Ah 25h GPT2 Capture/Reload Register 0000h
CC0 FE80h 40h CAPCOM Register 0 0000h
CC0IC b FF78h BCh CAPCOM Register 0 Interrupt Control Register - - 00h
CC1 FE82h 41h CAPCOM Register 1 0000h
CC1IC b FF7Ah BDh CAPCOM Register 1 Interrupt Control Register - - 00h
CC2 FE84h 42h CAPCOM Register 2 0000h
CC2IC b FF7Ch BEh CAPCOM Register 2 Interrupt Control Register - - 00h
Special function register overview ST10F280
186/239 Doc ID 8673 Rev. 3
CC3 FE86h 43h CAPCOM Register 3 0000h
CC3IC b FF7Eh BFh CAPCOM Register 3 Interrupt Control Register - - 00h
CC4 FE88h 44h CAPCOM Register 4 0000h
CC4IC b FF80h C0h CAPCOM Register 4 Interrupt Control Register - - 00h
CC5 FE8Ah 45h CAPCOM Register 5 0000h
CC5IC b FF82h C1h CAPCOM Register 5 Interrupt Control Register - - 00h
CC6 FE8Ch 46h CAPCOM Register 6 0000h
CC6IC b FF84h C2h CAPCOM Register 6 Interrupt Control Register - - 00h
CC7 FE8Eh 47h CAPCOM Register 7 0000h
CC7IC b FF86h C3h CAPCOM Register 7 Interrupt Control Register - - 00h
CC8 FE90h 48h CAPCOM Register 8 0000h
CC8IC b FF88h C4h CAPCOM Register 8 Interrupt Control Register - - 00h
CC9 FE92h 49h CAPCOM Register 9 0000h
CC9IC b FF8Ah C5h CAPCOM Register 9 Interrupt Control Register - - 00h
CC10 FE94h 4Ah CAPCOM Register 10 0000h
CC10IC b FF8Ch C6h CAPCOM Register 10 Interrupt Control Register - - 00h
CC11 FE96h 4Bh CAPCOM Register 11 0000h
CC11IC b FF8Eh C7h CAPCOM Register 11 Interrupt Control Register - - 00h
CC12 FE98h 4Ch CAPCOM Register 12 0000h
CC12IC b FF90h C8h CAPCOM Register 12 Interrupt Control Register - - 00h
CC13 FE9Ah 4Dh CAPCOM Register 13 0000h
CC13IC b FF92h C9h CAPCOM Register 13 Interrupt Control Register - - 00h
CC14 FE9Ch 4Eh CAPCOM Register 14 0000h
CC14IC b FF94h CAh CAPCOM Register 14 Interrupt Control Register - - 00h
CC15 FE9Eh 4Fh CAPCOM Register 15 0000h
CC15IC b FF96h CBh CAPCOM Register 15 Interrupt Control Register - - 00h
CC16 FE60h 30h CAPCOM Register 16 0000h
CC16IC b F160h E B0h CAPCOM Register 16 Interrupt Control Register - - 00h
CC17 FE62h 31h CAPCOM Register 17 0000h
CC17IC b F162h E B1h CAPCOM Register 17 Interrupt Control Register - - 00h
CC18 FE64h 32h CAPCOM Register 18 0000h
CC18IC b F164h E B2h CAPCOM Register 18 Interrupt Control Register - - 00h
CC19 FE66h 33h CAPCOM Register 19 0000h
CC19IC b F166h E B3h CAPCOM Register 19 Interrupt Control Register - - 00h
Table 38. Special function registers listed by name (continued)
Name Physical
address 8-bit
address Description Reset
value
ST10F280 Special function register overview
Doc ID 8673 Rev. 3 187/239
CC20 FE68h 34h CAPCOM Register 20 0000h
CC20IC b F168h E B4h CAPCOM Register 20 Interrupt Control Register - - 00h
CC21 FE6Ah 35h CAPCOM Register 21 0000h
CC21IC b F16Ah E B5h CAPCOM Register 21 Interrupt Control Register - - 00h
CC22 FE6Ch 36h CAPCOM Register 22 0000h
CC22IC b F16Ch E B6h CAPCOM Register 22 Interrupt Control Register - - 00h
CC23 FE6Eh 37h CAPCOM Register 23 0000h
CC23IC b F16Eh E B7h CAPCOM Register 23 Interrupt Control Register - - 00h
CC24 FE70h 38h CAPCOM Register 24 0000h
CC24IC b F170h E B8h CAPCOM Register 24 Interrupt Control Register - - 00h
CC25 FE72h 39h CAPCOM Register 25 0000h
CC25IC b F172h E B9h CAPCOM Register 25 Interrupt Control Register - - 00h
CC26 FE74h 3Ah CAPCOM Register 26 0000h
CC26IC b F174h E BAh CAPCOM Register 26 Interrupt Control Register - - 00h
CC27 FE76h 3Bh CAPCOM Register 27 0000h
CC27IC b F176h E BBh CAPCOM Register 27 Interrupt Control Register - - 00h
CC28 FE78h 3Ch CAPCOM Register 28 0000h
CC28IC b F178h E BCh CAPCOM Register 28 Interrupt Control Register - - 00h
CC29 FE7Ah 3Dh CAPCOM Register 29 0000h
CC29IC b F184h E C2h CAPCOM Register 29 Interrupt Control Register - - 00h
CC30 FE7Ch 3Eh CAPCOM Register 30 0000h
CC30IC b F18Ch E C6h CAPCOM Register 30 Interrupt Control Register - - 00h
CC31 FE7Eh 3Fh CAPCOM Register 31 0000h
CC31IC b F194h E CAh CAPCOM Register 31 Interrupt Control Register - - 00h
CCM0 b FF52h A9h CAPCOM Mode Control Register 0 0000h
CCM1 b FF54h AAh CAPCOM Mode Control Register 1 0000h
CCM2 b FF56h ABh CAPCOM Mode Control Register 2 0000h
CCM3 b FF58h ACh CAPCOM Mode Control Register 3 0000h
CCM4 b FF22h 91h CAPCOM Mode Control Register 4 0000h
CCM5 b FF24h 92h CAPCOM Mode Control Register 5 0000h
CCM6 b FF26h 93h CAPCOM Mode Control Register 6 0000h
CCM7 b FF28h 94h CAPCOM Mode Control Register 7 0000h
CP FE10h 08h CPU Context Pointer Register FC00h
CRIC b FF6Ah B5h GPT2 CAPREL Interrupt Control Register - - 00h
Table 38. Special function registers listed by name (continued)
Name Physical
address 8-bit
address Description Reset
value
Special function register overview ST10F280
188/239 Doc ID 8673 Rev. 3
CSP FE08h 04h CPU Code Segment Pointer Register (read only) 0000h
DP0L b F100h E 80h P0L Direction Control Register - - 00h
DP0H b F102h E 81h P0h Direction Control Register - - 00h
DP1L b F104h E 82h P1L Direction Control Register - - 00h
DP1H b F106h E 83h P1h Direction Control Register - - 00h
DP2 b FFC2h E1h Port 2 Direction Control Register 0000h
DP3 b FFC6h E3h Port 3 Direction Control Register 0000h
DP4 b FFCAh E5h Port 4 Direction Control Register - - 00h
DP6 b FFCEh E7h Port 6 Direction Control Register - - 00h
DP7 b FFD2h E9h Port 7 Direction Control Register - - 00h
DP8 b FFD6h EBh Port 8 Direction Control Register - - 00h
DPP0 FE00h 00h CPU Data Page Pointer 0 Register (10-bit) 0000h
DPP1 FE02h 01h CPU Data Page Pointer 1 Register (10-bit) 0001h
DPP2 FE04h 02h CPU Data Page Pointer 2 Register (10-bit) 0002h
DPP3 FE06h 03h CPU Data Page Pointer 3 Register (10-bit) 0003h
EXICON b F1C0h E E0h External Interrupt Control Register 0000h
EXISEL b F1DAh E EDh External Interrupt Source Selection Register 0000h
IDCHIP F07Ch E 3Eh Device Identifier Register (n is the device
revision)
118nh
IDMANUF F07Eh E 3Fh Manufacturer Identifier Register 0401h
IDMEM F07Ah E 3Dh On-chip Memory Identifier Register 3080h
IDPROG F078h E 3Ch Programming Voltage Identifier Register 0040h
IDX0 b FF08h 84h MAC Unit Address Pointer 0 0000h
IDX1 b FF0Ah 85h MAC Unit Address Pointer 1 0000h
MAH FE5Eh 2Fh MAC Unit Accumulator - High Word 0000h
MAL FE5Ch 2Eh MAC Unit Accumulator - Low Word 0000h
MCW b FFDCh EEh MAC Unit Control Word 0000h
MDC b FF0Eh 87h CPU Multiply Divide Control Register 0000h
MDH FE0Ch 06h CPU Multiply Divide Register – High Word 0000h
MDL FE0Eh 07h CPU Multiply Divide Register – Low Word 0000h
MRW b FFDAh EDh MAC Unit Repeat Word 0000h
MSW b FFDEh EFh MAC Unit Status Word 0200h
ODP2 b F1C2h E E1h Port 2 Open Drain Control Register 0000h
ODP3 b F1C6h E E3h Port 3 Open Drain Control Register 0000h
Table 38. Special function registers listed by name (continued)
Name Physical
address 8-bit
address Description Reset
value
ST10F280 Special function register overview
Doc ID 8673 Rev. 3 189/239
ODP4 b F1CAh E E5h Port 4 Open Drain Control Register - - 00h
ODP6 b F1CEh E E7h Port 6 Open Drain Control Register - - 00h
ODP7 b F1D2h E E9h Port 7 Open Drain Control Register - - 00h
ODP8 b F1D6h E EBh Port 8 Open Drain Control Register - - 00h
ONES b FF1Eh 8Fh Constant Value 1’s Register (read only) FFFFh
P0L b FF00h 80h PORT0 Low Register (Lower half of PORT0) - - 00h
P0H b FF02h 81h PORT0 High Register (Upper half of PORT0) - - 00h
P1L b FF04h 82h PORT1 Low Register (Lower half of PORT1) - - 00h
P1H b FF06h 83h PORT1 High Register (Upper half of PORT1) - - 00h
P2 b FFC0h E0h Port 2 Register 0000h
P3 b FFC4h E2h Port 3 Register 0000h
P4 b FFC8h E4h Port 4 Register (8-bit) - - 00h
P5 b FFA2h D1h Port 5 Register (read only) XXXXh
P6 b FFCCh E6h Port 6 Register (8-bit) - - 00h
P7 b FFD0h E8h Port 7 Register (8-bit) - - 00h
P8 b FFD4h EAh Port 8 Register (8-bit) - - 00h
P5DIDIS b FFA4h D2h Port 5 Digital Disable Register 0000h
POCON0L F080h E 40h PORT0 Low Output Control Register (8-bit) - - 00h
POCON0H F082h E 41h PORT0 High Output Control Register (8-bit) - - 00h
POCON1L F084h E 42h PORT1 Low Output Control Register (8-bit) - - 00h
POCON1H F086h E 43h PORT1 High Output Control Register (8-bit) - - 00h
POCON2 F088h E 44h Port2 Output Control Register 0000h
POCON3 F08Ah E 45h Port3 Output Control Register 0000h
POCON4 F08Ch E 46h Port4 Output Control Register (8-bit) - - 00h
POCON6 F08Eh E 47h Port6 Output Control Register (8-bit) - - 00h
POCON7 F090h E 48h Port7 Output Control Register (8-bit) - - 00h
POCON8 F092h E 49h Port8 Output Control Register (8-bit) - - 00h
POCON20 F0AAh E 55h ALE, RD, WR Output Control Register (8-bit) - - 00h
PECC0 FEC0h 60h PEC Channel 0 Control Register 0000h
PECC1 FEC2h 61h PEC Channel 1 Control Register 0000h
PECC2 FEC4h 62h PEC Channel 2 Control Register 0000h
PECC3 FEC6h 63h PEC Channel 3 Control Register 0000h
PECC4 FEC8h 64h PEC Channel 4 Control Register 0000h
PECC5 FECAh 65h PEC Channel 5 Control Register 0000h
Table 38. Special function registers listed by name (continued)
Name Physical
address 8-bit
address Description Reset
value
Special function register overview ST10F280
190/239 Doc ID 8673 Rev. 3
PECC6 FECCh 66h PEC Channel 6 Control Register 0000h
PECC7 FECEh 67h PEC Channel 7 Control Register 0000h
PICON b F1C4h E E2h Port Input Threshold Control Register - - 00h
PP0 F038h E 1Ch PWM Module Period Register 0 0000h
PP1 F03Ah E 1Dh PWM Module Period Register 1 0000h
PP2 F03Ch E 1Eh PWM Module Period Register 2 0000h
PP3 F03Eh E 1Fh PWM Module Period Register 3 0000h
PSW b FF10h 88h CPU Program Status Word 0000h
PT0 F030h E 18h PWM Module Up/Down Counter 0 0000h
PT1 F032h E 19h PWM Module Up/Down Counter 1 0000h
PT2 F034h E 1Ah PWM Module Up/Down Counter 2 0000h
PT3 F036h E 1Bh PWM Module Up/Down Counter 3 0000h
PW0 FE30h 18h PWM Module Pulse Width Register 0 0000h
PW1 FE32h 19h PWM Module Pulse Width Register 1 0000h
PW2 FE34h 1Ah PWM Module Pulse Width Register 2 0000h
PW3 FE36h 1Bh PWM Module Pulse Width Register 3 0000h
PWMCON0 b FF30h 98h PWM Module Control Register 0 0000h
PWMCON1 b FF32h 99h PWM Module Control Register 1 0000h
PWMIC b F17Eh E BFh PWM Module Interrupt Control Register - - 00h
QR0 F004h E 02h MAC Unit Offset Register QR0 0000h
QR1 F006h E 03h MAC Unit Offset Register QR1 0000h
QX0 F000h E 00h MAC Unit Offset Register QX0 0000h
QX1 F002h E 01h MAC Unit Offset Register QX1 0000h
RP0H b F108h E 84h System Start-up Configuration Register (read
only)
- - XXh
S0BG FEB4h 5Ah Serial Channel 0 Baud Rate Generator Reload
Register
0000h
S0CON b FFB0h D8h Serial Channel 0 Control Register 0000h
S0EIC b FF70h B8h Serial Channel 0 Error Interrupt Control Register - - 00h
S0RBUF FEB2h 59h Serial Channel 0 Receive Buffer Register (read
only)
- - XXh
S0RIC b FF6Eh B7h Serial Channel 0 Receive Interrupt Control
Register
- - 00h
S0TBIC b F19Ch E CEh Serial Channel 0 Transmit Buffer Interrupt
Control Register
- - 00h
Table 38. Special function registers listed by name (continued)
Name Physical
address 8-bit
address Description Reset
value
ST10F280 Special function register overview
Doc ID 8673 Rev. 3 191/239
S0TBUF FEB0h 58h Serial Channel 0 Transmit Buffer Register (write
only)
0000h
S0TIC b FF6Ch B6h Serial Channel 0 Transmit Interrupt Control
Register
- - 00h
SP FE12h 09h CPU System Stack Pointer Register FC00h
SSCBR F0B4h E 5Ah SSC Baud Rate Register 0000h
SSCCON b FFB2h D9h SSC Control Register 0000h
SSCEIC b FF76h BBh SSC Error Interrupt Control Register - - 00h
SSCRB F0B2h E 59h SSC Receive Buffer (read only) XXXXh
SSCRIC b FF74h BAh SSC Receive Interrupt Control Register - - 00h
SSCTB F0B0h E 58h SSC Transmit Buffer (write only) 0000h
SSCTIC b FF72h B9h SSC Transmit Interrupt Control Register - - 00h
STKOV FE14h 0Ah CPU Stack Overflow Pointer Register FA00h
STKUN FE16h 0Bh CPU Stack Underflow Pointer Register FC00h
SYSCON b FF12h 89h CPU System Configuration Register 0xx0h(1)
T0 FE50h 28h CAPCOM Timer 0 Register 0000h
T01CON b FF50h A8h CAPCOM Timer 0 and Timer 1 Control Register 0000h
T0IC b FF9Ch CEh CAPCOM Timer 0 Interrupt Control Register - - 00h
T0REL FE54h 2Ah CAPCOM Timer 0 Reload Register 0000h
T1 FE52h 29h CAPCOM Timer 1 Register 0000h
T1IC b FF9Eh CFh CAPCOM Timer 1 Interrupt Control Register - - 00h
T1REL FE56h 2Bh CAPCOM Timer 1 Reload Register 0000h
T2 FE40h 20h GPT1 Timer 2 Register 0000h
T2CON b FF40h A0h GPT1 Timer 2 Control Register 0000h
T2IC b FF60h B0h GPT1 Timer 2 Interrupt Control Register - - 00h
T3 FE42h 21h GPT1 Timer 3 Register 0000h
T3CON b FF42h A1h GPT1 Timer 3 Control Register 0000h
T3IC b FF62h B1h GPT1 Timer 3 Interrupt Control Register - - 00h
T4 FE44h 22h GPT1 Timer 4 Register 0000h
T4CON b FF44h A2h GPT1 Timer 4 Control Register 0000h
T4IC b FF64h B2h GPT1 Timer 4 Interrupt Control Register - - 00h
T5 FE46h 23h GPT2 Timer 5 Register 0000h
T5CON b FF46h A3h GPT2 Timer 5 Control Register 0000h
T5IC b FF66h B3h GPT2 Timer 5 Interrupt Control Register - - 00h
T6 FE48h 24h GPT2 Timer 6 Register 0000h
Table 38. Special function registers listed by name (continued)
Name Physical
address 8-bit
address Description Reset
value
Special function register overview ST10F280
192/239 Doc ID 8673 Rev. 3
T6CON b FF48h A4h GPT2 Timer 6 Control Register 0000h
T6IC b FF68h B4h GPT2 Timer 6 Interrupt Control Register - - 00h
T7 F050h E 28h CAPCOM Timer 7 Register 0000h
T78CON b FF20h 90h CAPCOM Timer 7 and 8 Control Register 0000h
T7IC b F17Ah E BEh CAPCOM Timer 7 Interrupt Control Register - - 00h
T7REL F054h E 2Ah CAPCOM Timer 7 Reload Register 0000h
T8 F052h E 29h CAPCOM Timer 8 Register 0000h
T8IC b F17Ch E BFh CAPCOM Timer 8 Interrupt Control Register - - 00h
T8REL F056h E 2Bh CAPCOM Timer 8 Reload Register 0000h
TFR b FFACh D6h Trap Flag Register 0000h
WDT FEAEh 57h Watchdog Timer Register (read only) 0000h
WDTCON b FFAEh D7h Watchdog Timer Control Register 00xxh(2)
XP0IC b F186h E C3h CAN1 Module Interrupt Control Register - - 00h(3)
XP1IC b F18Eh E C7h CAN2 Module Interrupt Control Register - - 00h(3)
XP2IC b F196h E CBh XPWM Interrupt Control Register - - 00h(3)
XP3IC b F19Eh E CFh PLL unlock Interrupt Control Register - - 00h(3)
XPERCON F024h E 12h XPER Configuration Register - - 05h
ZEROS b FF1Ch 8Eh Constant Value 0’s Register (read only) 0000h
1. The system configuration is selected during reset.
2. Bit WDTR indicates a watchdog timer triggered reset.
3. The XPnIC Interrupt Control Registers control interrupt requests from integrated X-Bus peripherals. Some
software controlled interrupt requests may be generated by setting the XPnIR bits (of XPnIC register) of the
unused X-peripheral nodes.
Table 39. X registers listed by name
Name Physical
address Description Reset
value
CAN1BTR EF04h CAN1 Bit Timing Register XXXXh
CAN1CSR EF00h CAN1 Control/Status Register XX01h
CAN1GMS EF06h CAN1 Global Mask Short XFXXh
CAN1IR EF02h CAN1 Interrupt Register - - XXh
CAN1LAR1--15 EF14--EFF4h CAN1 Lower Arbitration register 1 to 15 XXXXh
CAN1LGML EF0Ah CAN1 Lower Global Mask Long XXXXh
CAN1LMLM EF0Eh CAN1 Lower Mask Last Message XXXXh
CAN1MCR1--15 EF10--EFF0h CAN1 Message Control Register 1 to 15 XXXXh
CAN1MO1--15 EF1x--EFFxh CAN1 Message Object 1 to 15 XXXXh
Table 38. Special function registers listed by name (continued)
Name Physical
address 8-bit
address Description Reset
value
ST10F280 Special function register overview
Doc ID 8673 Rev. 3 193/239
CAN1UAR1--15 EF12--EFF2h CAN1 Upper Arbitration Register 1 to 15 XXXXh
CAN1UGML EF08h CAN1 Upper Global Mask Long XXXXh
CAN1UMLM EF0Ch CAN1 Upper Mask Last Message XXXXh
CAN2BTR EE04h CAN2 Bit Timing Register XXXXh
CAN2CSR EE00h CAN2 Control/Status Register XX01h
CAN2GMS EE06h CAN2 Global Mask Short XFXXh
CAN2IR EE02h CAN2 Interrupt Register - - XXh
CAN2LAR1--15 EE14--EEF4h CAN2 Lower Arbitration register 1 to 15 XXXXh
CAN2LGML EE0Ah CAN2 Lower Global Mask Long XXXXh
CAN2LMLM EE0Eh CAN2 Lower Mask Last Message XXXXh
CAN2MCR1--15 EE10--EEF0h CAN2 Message Control Register 1 to 15 XXXXh
CAN2MO1--15 EE1x--EEFxh CAN2 Message Object 1 to 15 XXXXh
CAN2UAR1--15 EE12--EEF2h CAN2 Upper Arbitration Register 1 to 15 XXXXh
CAN2UGML EE08h CAN2 Upper Global Mask Long XXXXh
CAN2UMLM EE0Ch CAN2 Upper Mask Last Message XXXXh
XADCMUX C384h Port5 or PortX10 ADC Input Selection (Read / Write) 0000h
XDP9 C200h Direction Register Xport9 (Read / Write) 0000h
XDP9CLR C204h Bit Clear Direction Register Xport9 (Write only) 0000h
XDP9SET C202h Bit Set Direction Register Xport9 (Write only) 0000h
XODP9 C300H Open Drain Control Register Xport9 (Read / Write) 0000h
XODP9CLR C304H Bit clear Open drain Control register Xport9 (Write
only) 0000h
XODP9SET C302H Bit Set Open Drain Control Register Xport9 (Write
only) 0000h
XP10 C380h Read only Data register Xport10 (Read only) 0000h
XP10DIDIS C382h Xport10 Schmitt Trigger Input Selection (Read /
Write) 0000h
XP9 C100h Data Register Xport9 (Read / Write) 0000h
XP9CLR C104h Bit Clear Data Register Xport9 (Write only) 0000h
XP9SET C102h Bit Set Data Register Xport9 (Write only) 0000h
XPOLAR EC04h XPWM Channel Polarity Control Register 0000h
XPP0 EC20h XPWM Period Register 0 0000h
XPP1 EC22h XPWM Period Register 1 0000h
XPP2 EC24H XPWM Period Register 2 0000h
XPP3 EC26h XPWM Period Register 3 0000h
Table 39. X registers listed by name (continued)
Name Physical
address Description Reset
value
Special function register overview ST10F280
194/239 Doc ID 8673 Rev. 3
19.1 Identification registers
The ST10F280 has four Identification registers, mapped in ESFR space. These register
contain:
●A manufacturer identifier,
●A chip identifier, with its revision,
●A internal memory and size identifier and programming voltage description.
IDMANUF
Address: F07Eh / 3Fh ESFR
Reset: 0x0401h
Type: R
XPT0 EC10h XPWM Timer Counter Register 0 0000h
XPT1 EC12h XPWM Timer Counter Register 1 0000h
XPT2 EC14h XPWM Timer Counter Register 2 0000h
XPT3 EC16h XPWM Timer Counter Register 3 0000h
XPW0 EC30h XPWM Pulse Width Register 0 0000h
XPW1 EC32h XPWM Pulse Width Register 1 0000h
XPW2 EC34h XPWM Pulse Width Register 2 0000h
XPW3 EC36h XPWM Pulse Width Register 3 0000h
XPWMCON0 EC00h XPWM Control Register 0 0000h
XPWMCON1 EC02h XPWM Control Register 1 0000h
XTCR C000h Xtimer Control Register (Read / Write) 0000h
XTCVR C006h Xtimer Current Value Register (Read / Write) 0000h
XTEVR C004h Xtimer End Value Register (Read / Write) 0000h
XTSVR C002h Xtimer Start Value Register (Read / Write) 0000h
Table 39. X registers listed by name (continued)
Name Physical
address Description Reset
value
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
MANUF 00001
R
MANUF Manufacturer Identifier 020h: STMicroelectronics Manufacturer (JTAG worldwide
normalization).
ST10F280 Special function register overview
Doc ID 8673 Rev. 3 195/239
IDCHIP
Address: F07Ch / 3Eh ESFR
Reset: 0x118Xh
Type: R
IDMEM
Address: 0xF07Ah / 3Dh ESFR
Reset: 0x3080h
Type: R
IDPROG
Address: F078h / 3Ch ESFR
Reset: 0x0040h
Type: R
Note: 1. All identification words are read only registers.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
CHIPID REVID
RR
REVID Device Revision Identifier
CHIPID Device Identifier 118h: ST10F280 identifier.
1514131211109876543210
MEMTYP MEMSIZE
RR
MEMSIZE Internal Memory Size is calculated using the following formula:
Size = 4 x [MEMSIZE] (in K Byte) 080h for ST10F280 (512K Byte)
MEMTYP Internal Memory Type 3h for ST10F280 (Flash memory).
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
PROGVPP PROGVDD
RR
PROGVDD Programming VDD Voltage
VDD voltage when programming EPROM or FLASH devices is calculated using the
following formula: VDD = 20 x [PROGVDD] / 256 (volts) 40h for ST10F280 (5V).
PROGVPP Programming VPP Voltage (no need of external VPP) 00h
Special function register overview ST10F280
196/239 Doc ID 8673 Rev. 3
19.2 System configuration registers
The ST10F280 has registers used for different configuration of the overall system. These
registers are described below.
SYSCON
Address: 0xFF12h / 89h SFR
Reset: 0x0XX0h
Type: R/W
Note: Register SYSCON cannot be changed after execution of the EINIT instruction.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
STKSZ
ROMS1
SGTDIS
ROMEN
BYTDIS
CLKEN
WRCFG
CSCFG
PWD CFG
OWD DIS
BDR STEN
XPEN
VISIBLE
XPER-SHARE
R/W R/W R/W R/W(1)
1. These bit are set directly or indirectly according to PORT0 and EA pin configuration during reset
sequence.
R/W(1) R/W R/W(1) R/W R/W R/W R/W R/W R/W R/W
XPER-SHARE XBUS Peripheral Share Mode Control
0: External accesses to XBUS peripherals are disabled
1: XBUS peripherals are accessible via the external bus during hold mode
VISIBLE Visible Mode Control
0: Accesses to XBUS peripherals are done internally
1: XBUS peripheral accesses are made visible on the external pins
XPEN XBUS Peripheral Enable bit
0: Accesses to the on-chip X-Peripherals and XRAM are disabled
1: The on-chip X-Peripherals are enabled.
BDRSTEN Bidirectional Reset Enable
0: RSTIN pin is an input pin only. (SW Reset or WDT Reset have no effect on this pin)
1: RSTIN pin is a bidirectional pin. This pin is pulled low during 1024 TCL during reset
sequence.
OWDDIS Oscillator Watchdog Disable Control
0: Oscillator Watchdog (OWD) is enabled. If PLL is bypassed, the OWD monitors
XTAL1 activity. If there is no activity on XTAL1 for at least 1 μs, the CPU clock is
switched automatically to PLL’s base frequency (2 to 10MHz).
1: OWD is disabled. If the PLL is bypassed, the CPU clock is always driven by XTAL1
signal. The PLL is turned off to reduce power supply current.
PWDCFG Power Down Mode Configuration Control
0: Power Down Mode can only be entered during PWRDN instruction execution if NMI
pin is low, otherwise the instruction has no effect. Exit power down only with reset.
1: Power Down Mode can only be entered during PWRDN instruction execution if all
enabled fast external interrupt EXxIN pins are in their inactive level. Exiting this mode
can be done by asserting one enabled EXxIN pin or with external reset.
ST10F280 Special function register overview
Doc ID 8673 Rev. 3 197/239
CSCFG Chip Select Configuration Control
0: Latched Chip Select lines: CSx change 1 TCL after rising edge of ALE
1: Unlatched Chip Select lines: CSx change with rising edge of ALE.
WRCFG Write Configuration Control (Inverted copy of bit WRC of RP0H)
0: Pins WR and BHE retain their normal function
1: Pin WR acts as WRL, pin BHE acts as WRH.
CLKEN System Clock Output Enable (CLKOUT)
0: CLKOUT disabled: pin may be used for general purpose I/O
1: CLKOUT enabled: pin outputs the system clock signal.
BYTDIS Disable/Enable Control for Pin BHE (Set according to data bus width)
0: Pin BHE enabled
1: Pin BHE disabled, pin may be used for general purpose I/O.
ROMEN Internal Memory Enable (Set according to pin EA during reset)
0: Internal Memory disabled: accesses to the Memory area use the external bus
1: Internal Memory enabled.
SGTDIS Segmentation Disable/Enable Control
0: Segmentation enabled (CSP is saved/restored during interrupt entry/exit)
1: Segmentation disabled (Only IP is saved/restored).
ROMS1 Internal Flash Memory Mapping
0: Internal Flash Memory area mapped to segment 0 (00’0000H...00’7FFFH)
1: Internal Flash Memory area mapped to segment 1 (01’0000H...01’7FFFH).
STKSZ System Stack Size
Selects the size of the system stack (in the internal RAM) from 32 to 1024 words.
Table 40. Stack size selection
<STKSZ> Stack
size
(words) Internal RAM addresses (words) of physical stack Significant bits
of st ack pointer
SP
0 0 0 b 256 00’FBFEh...00’FA00h (Default after Reset) SP.8...SP.0
0 0 1 b 128 00’FBFEh...00’FB00h SP.7...SP.0
0 1 0 b 64 00’FBFEh...00’FB80h SP.6...SP.0
0 1 1 b 32 00’FBFEh...00’FBC0h SP.5...SP.0
1 0 0 b 512 00’FBFEh...00’F800h (not for 1K Byte IRAM) SP.9...SP.0
1 0 1 b - Reserved. Do not use this combination -
1 1 0 b - Reserved. Do not use this combination -
1 1 1 b 1024
00’FDFEh...00’FX00h (Note: No circular stack)
00’FX00h represents the lower IRAM limit, i.e.
1K Byte: 00’FA00h, 2K Byte: 00’F600h, 3K Byte:
00’F200h
SP.11...SP.0
Special function register overview ST10F280
198/239 Doc ID 8673 Rev. 3
BUSCON0
Address: 0xFF0Ch / 86h SFR
Reset: 0x0XX0h
Type: R/W
BUSCON1
Address: 0xFF14h / 8Ah SFR
Reset: 0x0000h
Type: R/W
BUSCON2
Address: 0xFF16h / 8Bh SFR
Reset: 0x0000h
Type: R/W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
CSWEN0
CSREN0
RDYPOL0
RDYEN0
-
BUS ACT0
ALE CTL0
-BTYP
MTTC0
RWDC0
MCTC
R/W R/W R/W R/W R/W(1)
1. BUSCON0 is initialized with 0000h, if EA pin is high during reset. If EA pin is low during reset, bit BUSACT0
and ALECTRL0 are set (’1’) and bit field BTYP is loaded with the bus configuration selected via PORT0.
R/W(1) R/W(2)
2. BTYP (bit 6 and 7) are set according to the configuration of the bit l1 and l2 of PORT0 latched at the end of
the reset sequence.
R/W R/W R/W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
CSWEN1
CSREN1
RDYPOL1
RDYEN1
-
BUSACT1
ALECTL1
-BTYP
MTTC1
RWDC1
MCTC
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
CSWEN2
CSREN2
RDYPOL2
RDYEN2
-
BUSACT2
ALECTL2
-BTYP
MTTC2
RWDC2
MCTC
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
ST10F280 Special function register overview
Doc ID 8673 Rev. 3 199/239
BUSCON3
Address: 0xFF18h / 8Ch SFR
Reset: 0x0000h
Type: R/W
BUSCON4
Address: 0xFF14h / 8Dh SFR
Reset: 0x0000h
Type: R/W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
CSWEN3
CSREN3
RDYPOL3
RDYEN3
-
BUSACT3
ALECTL3
-BTYP
MTTC3
RWDC3
MCTC
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
CSWEN4
CSREN4
RDYPOL4
RDYEN4
-
BUSACT4
ALECTL4
-BTYP
MTTC4
RWDC4
MCTC
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
MCTC Memory Cycle Time Control (Number of memory cycle time wait states)
0000: 15 wait states (Nber = 15 [MCTC])
. . .
1111: No wait states
RWDCx Read/Write Delay Control for BUSCONx
0: With read/write delay: activate command 1 TCL after falling edge of ALE
1: No read/write delay: activate command with falling edge of ALE
MTTCx Memory Tristate Time Control
0: 1 wait state
1: No wait state
BTYP External Bus Configuration
00: 8-bit Demultiplexed Bus
01: 8-bit Multiplexed Bus
10: 16-bit Demultiplexed Bus
11: 16-bit Multiplexed Bus
Note: For BUSCON0, BTYP bit-field is defined via PORT0 during reset.
ALECTLx ALE Lengthening Control
0: Normal ALE signal
1: Lengthened ALE signal
BUSACTx Bus Active Control
0: External bus disabled
1: External bus enabled (within the respective address window, see ADDRSEL)
Special function register overview ST10F280
200/239 Doc ID 8673 Rev. 3
RP0H
Address: 0xF108h / 84h ESFR
Reset: 0x--XXh
Type: R
RDYENx READY Input Enable
0: External bus cycle is controlled by bit field MCTC only
1: External bus cycle is controlled by the READY input signal
RDYPOLx Ready Active Level Control
0: Active level on the READY pin is low, bus cycle terminates with a ‘0’ on READY
pin,
1: Active level on the READY pin is high, bus cycle terminates with a ‘1’ on READY
pin.
CSRENx Read Chip Select Enable
0: The CS signal is independent of the read command (RD)
1: The CS signal is generated for the duration of the read command
CSWENx Write Chip Select Enable
0: The CS signal is independent of the write command (WR,WRL,WRH)
1: The CS signal is generated for the duration of the write command
1514131211109 87654321 0
-------- CLKSEL SALSEL CSSEL WRC
R (1)(2)
1. RP0H.7 to RP0H.5 bits are loaded only during a long hardware reset. As pull-up resistors are active on
each Port P0H pins during reset, RP0H default value is "FFh"
2. These bits are set according to Port 0 configuration during any reset sequence.
R (2) R (2) R(2)
WRC Write Configuration Control
0: Pin WR acts as WRL, pin BHE acts as WRH
1: Pins WR and BHE retain their normal function
CSSEL Chip Select Line Selection (Number of active CS outputs)
00: 3 CS lines: CS2...CS0
01: 2 CS lines: CS1...CS0
10: No CS lines at all
11: 5 CS lines: CS4...CS0 (Default without pull-downs)
SALSEL Segment Address Line Selection (Number of active segment address outputs)
00: 4-bit segment address: A19...A16
01: No segment address lines at all
10: 8-bit segment address: A23...A16
11: 2-bit segment address: A17...A16 (Default without pull-downs)
ST10F280 Special function register overview
Doc ID 8673 Rev. 3 201/239
EXICON
Address: 0xF1C0h / E0h ESFR
Reset: 0x0000h
Type: R/W
EXISEL
Address: 0xF1DAh / EDh ESFR
Reset: 0x0000h
Type: R/W
CLKSEL System Clock Selection
000: fCPU = 2.5 x fOSC
001: fCPU = 0.5 x fOSC
010: fCPU = 10 x fOSC
011: fCPU = fOSC
100: fCPU = 5 x fOSC
101: fCPU = 2 x fOSC
110: fCPU = 3 x fOSC
111: fCPU = 4 x fOSC
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
EXI7ES EXI6ES EXI5ES EXI4ES EXI3ES EXI2ES EXI1ES EXI0ES
R/W R/W R/W R/W R/W R/W R/W R/W
EXIxES(x=7...0) External Interrupt x Edge Selection Field (x=7...0)
00: Fast external interrupts disabled: standard mode
EXxIN pin not taken in account for entering/exiting Power Down mode.
01: Interrupt on positive edge (rising)
Enter Power Down mode if EXiIN = ‘0’, exit if EXxIN = ‘1’ (referred as ‘high’ active
level)
10: Interrupt on negative edge (falling)
Enter Power Down mode if EXiIN = ‘1’, exit if EXxIN = ‘0’ (referred as ‘low’ active
level)
11: Interrupt on any edge (rising or falling)
Always enter Power Down mode, exit if EXxIN level changed.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
EXI7SS EXI6SS EXI5SS EXI4SS EXI3SS EXI2SS EXI1SS EXI0SS
R/W R/W R/W R/W R/W R/W R/W R/W
EXIxSS External Interrupt x Source Selection (x=7...0)
00: Input from associated Port 2 pin.
01: Input from “alternate source”.
10: Input from Port 2 pin ORed with “alternate source”.
11: Input from Port 2 pin ANDed with “alternate source”.
Special function register overview ST10F280
202/239 Doc ID 8673 Rev. 3
XP3IC
Address: 0xF19Eh / CFh ESFR
Reset: 0x--00h
Type: R/W
Note: XP3IC register has the same bit field as xxIC interrupt registers
xxIC
Address: 0xyyyyh / zzh SFR
Reset: 0x--00h
Type: R/W
EXIxSS Port 2 pin Alternate source
0P2.8CAN1_RxD
1P2.9CAN2_RxD
2...7 P2.10...15 Not used (zero)
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
- - - - - - - - XP3IR XP3IE XP3ILVL GLVL
R/W R/W R/W R/W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
--------xxIRxxIE ILVL GLVL
R/W R/W R/W R/W
GLVL Group Level
Defines the internal order for simultaneous requests of the same priority.
11: Highest group priority
00: Lowest group priority
ILVL Interrupt Priority Level
Defines the priority level for the arbitration of requests.
1111: Highest priority level
0000: Lowest priority level
xxIE Interrupt Enable Control Bit (individually enables/disables a specific source)
0: Interrupt Request is disabled
1: Interrupt Request is enabled
xxIR Interrupt Request Flag
0: No request pending
1: This source has raised an interrupt request
ST10F280 Special function register overview
Doc ID 8673 Rev. 3 203/239
XPERCON
Address: 0xF024h / 12h ESFR
Reset: 0x--05h
Type: R/W
Note: When both CAN and XPWM are disabled via XPERCON setting, then any access in the
address range 00’EC00h 00’EFFFh will be directed to external memory interface, using the
BUSCONx register corresponding to address matching ADDRSELx register. P4.4 and P4.7
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
-----------
XPWMEN
XPERCONEN3
XRAMEN
CAN2EN
CAN1EN
R/W R/W R/W R/W R/W
CAN1EN CAN1 Enable Bit
0: Accesses to the on-chip CAN1 XPeripheral and its functions are disabled. P4.5
and P4.6 pins can be used as general purpose I/Os. Address range 00’EF00h-
00’EFFFh is only directed to external memory if CAN2EN and XPWM bits are
cleared also.
1: The on-chip CAN1 XPeripheral is enabled and can be accessed.
CAN2EN CAN2 Enable Bit
0: Accesses to the on-chip CAN2 XPeripheral and its functions are disabled. P4.4
and P4.7 pins can be used as general purpose I/Os. Address range 00’EE00h-
00’EEFFh is only directed to external memory if CAN1EN and XPWM bits are
cleared also.
T1: he on-chip CAN2 XPeripheral is enabled and can be accessed.
XRAMEN XRAM Enable Bit
0: Accesses to the on-chip 16K Byte XRAM are disabled, external access
performed.
1: The on-chip 16K Byte XRAM is enabled and can be accessed.
XPERCONEN3 XPORT9,XTIMER, XPORT10, XADCMUX Enable Bit
0: Accesses to the XPORT9, XTIMER, XPORT10, XADCMUX peripherals are
disabled, external access performed.
1: The on-chip XPORT9, XTIMER, XPORT10, XADCMUX peripherals are enabled
and can be accessed.
XPWMEN XPWM Enable Bit
0: Accesses to the on-chip XPWM are disabled, external access performed.
Address range 00’EC00h-00’ECFFh is only directed to external memory if CAN1EN
and CAN2EN are ‘0’ also
1: The on-chip XPWM is enabled and can be accessed.
Special function register overview ST10F280
204/239 Doc ID 8673 Rev. 3
can be used as General Purpose I/O when CAN2 is not enabled, and P4.5 and P4.6 can be
used as General Purpose I/O when CAN1 is not enabled.
The default XPER selection after Reset is: XCAN1 is enabled, XCAN2 is disabled, XRAM is
enabled, XPORT9, XTIMER, XPORT10, XPWM are disabled.
Register XPERCON cannot be changed after the global enabling of XPeripherals, i.e. after
setting of bit XPEN in SYSCON register.
ST10F280 Electri cal ch ara cter ist ics
Doc ID 8673 Rev. 3 205/239
20 Electrical characteristics
20.1 Absolute maximum ratings
Stresses the device above the rating listed in the Table 41: Absolute maximum ratings may
cause permanent damage to the device. This is a stress rating only and functional operation
of the device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum rating conditions
for extended periods may affect device reliability. During overload conditions (VIN > VDD or
VIN < VSS) the voltage on pins with respect to ground (VSS) must not exceed the values
defined Ta bl e 4 1 .
20.2 Parameter interpretation
The parameters listed in the following tables represent the characteristics of the ST10F280
and its demands on the system. Where the ST10F280 logic provides signals with their
respective timing characteristics, the symbol “CC” for Controller Characteristics, is included
in the “Symbol” column.
Where the external system must provide signals with their respective timing characteristics
to the ST10F280, the symbol “SR” for System Requirement, is included in the “Symbol”
column.
20.3 DC characteristics
VDD =5V ± 10%, V
SS =0V, f
CPU = 40 MHz, Reset active, TA= -40°C to 125°C
Table 41. Absolute maximum ratings
Symbol Parameter Value Unit
VDD Voltage on VDD pins with respect to ground -0.5, +6.5 V
VIO Voltage on any pin with respect to ground -0.5, (VDD +0.5) V
VAREF Voltage on VAREF pin with respect to ground -0.3, (VDD +0.3) V
IOV Input Current on any pin during overload condition -10, +10 mA
ITOV
Absolute Sum of all input currents during overload
condition |100 mA| mA
Ptot Power Dissipation 1.5 W
TAAmbient Temperature under bias -40, +125 °C
Tstg Storage Temperature -65, +150 °C
Table 42. DC characteristics
Symbol Parameter Test
conditions Min. Max. Unit
VIL SR Input low voltage – -0.5 0.2 VDD - 0.1 V
VILS SR Input low voltage (special threshold) – -0.5 2.0 V
Ele ctrical characteristics ST10F280
206/239 Doc ID 8673 Rev. 3
VIH SR Input high voltage
(all except RSTIN and XTAL1) –0.2 VDD +
0.9 VDD + 0.5 V
VIH1 SR Input high voltage RSTIN –0.6 V
DD VDD + 0.5 V
VIH2 SR Input high voltage XTAL1 – 0.7 VDD VDD + 0.5 V
VIHS SR Input high voltage (special threshold) – 0.8 VDD -
0.2 VDD + 0.5 V
HYS Input Hysteresis (special threshold)(1) –400–mV
VOL CC Output low voltage (PORT0, PORT1, Port 4,
ALE, RD, WR, BHE, CLKOUT, RSTOUT)(2) IOL = 2.4mA – 0.45 V
VOL1 CC Output low voltage (all other outputs)(2) IOL1 = 1.6mA – 0.45 V
VOH CC Output high voltage (PORT0, PORT1, Port4,
ALE, RD, WR, BHE, CLKOUT, RSTOUT)(2)
IOH = -500μA0.9 V
DD –V
IOH = -2.4mA 2.4 – V
VOH1 CC Output high voltage (all other outputs)(2)(3) IOH = – 250μA0.9 V
DD –V
IOH = – 1.6mA 2.4 – V
IOZ1 CC Input leakage current (Port 5, XPort 10) 0V < VIN < VDD –0.2μA
IOZ2 CC Input leakage current (all other) 0V < VIN < VDD –1μA
IOV SR Overload current(1) (4) –5mA
RRST CC RSTIN pull-up resistor(1) – 50 250 kΩ
IRWH Read / Write inactive current(5)(6) VOUT = 2.4V – -40 μA
IRWL Read / Write active current (5)(7) VOUT = VOLmax -500 – μA
IALEL ALE inactive current(5)(6) VOUT = VOLmax 40 – μA
IALEH ALE active current(5)(7) VOUT = 2.4V – 500 μA
IP6H Port 6 inactive current(5)(6) VOUT = 2.4V – -40 μA
IP6L Port 6 active current(5)(7) VOUT =
VOL1max
-500 – μA
IP0H PORT0 configuration current(5) VIN = VIHmin(6) –-10μA
IP0L VIN = VILmax(7) -100 – μA
IIL CC XTAL1 input current 0V < VIN < VDD –20μA
CIO CC Pin capacitance (digital inputs / outputs)(1)(5) f = 1MHz,
TA=25°C –10pF
ICC Power supply current(8) RSTIN = VIH1
fCPU in [MHz] –30 + 3.3 x
fCPU
mA
IID Idle mode supply current(9) RSTIN = VIH1
fCPU in [MHz] –20 + f
CPU mA
IPD Power-down mode supply current(10) VDD = 5.5V
TA = 55°C – 200 μA
1. Partially tested, guaranteed by design characterization.
Table 42. DC characteristics (continued)
Symbol Parameter Test
conditions Min. Max. Unit
ST10F280 Electri cal ch ara cter ist ics
Doc ID 8673 Rev. 3 207/239
Figure 74. Supply / idle current as a function of operating frequency
2. ST10F280 pins are equipped with low-noise output drivers which significantly improve the device’s EMI performance.
These low-noise drivers deliver their maximum current only until the respective target output level is reached. After this, the
output current is reduced. This results in increased impedance of the driver, which attenuates electrical noise from the
connected PCB tracks. The current specified in column “Test Conditions” is delivered in any cases.
3. This specification is not valid for outputs which are switched to open drain mode. In this case the respective output will float
and the voltage results from the external circuitry.
4. Overload conditions occur if the standard operating conditions are exceeded, i.e. the voltage on any pin exceeds the
specified range (i.e. VOV > VDD+0.5V or VOV <0.5V). The absolute sum of input overload currents on all port pins may not
exceed 50mA. The supply voltage must remain within the specified limits.
5. This specification is only valid during Reset, or during Hold-mode or Adapt-mode. Port 6 pins are only affected if they are
used for CS output and if their open drain function is not enabled.
6. The maximum current may be drawn while the respective signal line remains inactive
7. The minimum current must be drawn in order to drive the respective signal line active.
8. The power supply current is a function of the operating frequency. This dependency is illustrated in the Figure 70. These
parameters are tested at VDDmax and 40MHz CPU clock with all outputs disconnected and all inputs at VIL or VIH. The
chip is configured with a demultiplexed 16-bit bus, direct clock drive, 5 chip select lines and 2 segment address lines, EA
pin is low during reset. After reset, PORT 0 is driven with the value ‘00CCh’ that produces infinite execution of NOP
instruction with 15 wait-state, R/W delay, memory tristate wait state, normal ALE. Peripherals are not activated
9. Idle mode supply current is a function of the operating frequency. This dependency is illustrated in the Figure 70. These
parameters are tested at VDDmax and 40MHz CPU clock with all outputs disconnected and all inputs at VIL or VIH.
10. This parameter value includes leakage currents. With all inputs (including pins configured as inputs) at 0 V to 0.1V or at
VDD – 0.1V to VDD, VREF = 0V, all outputs (including pins configured as outputs) disconnected.
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Ele ctrical characteristics ST10F280
208/239 Doc ID 8673 Rev. 3
20.3.1 A/D converter characteristics
VDD = 5 V ± 10%, VSS = 0 V, TA = -40°C to 125°C, 4.0 V ≤ VAREF ≤ VDD + 0.1 V;
VSS0.1 V ≤VAGND ≤VSS + 0.2 V
Table 43. A/D converter characteristics
Symbol Parameter Test
Condition Min. Max Unit
VAREF SR Analog Reference voltage 4.0 VDD + 0.1 V
VAIN SR Analog input voltage (1)(2)
1. VAIN may exceed VAGND or VAREF up to the absolute maximum ratings. However, the conversion result
in these cases will be X000h or X3FFh, respectively.
2. To remove noise and undesirable high frequency components from the analog input signal, a low-pass
filter must be connected at the ADC input. The cut-off frequency of this filter should avoid 2 opposite
transitions during the ts sampling time of the ST10 ADC:
- fcut-off ≤ 1 / 5 ts to 1/10 ts
where ts is the sampling time of the ST10 ADC and is not related to the Nyquist frequency determined by
the tc conversion time.
VAGND VAREF V
IAREF CC
Reference supply current
running mode
power-down mode
(3)
3. Partially tested, guaranteed by design characterization.
–
–
500
1
μA
μA
CAIN CC
ADC input capacitance
Not sampling
Sampling
(3) –
–
10
15
pF
pF
tSCC Sample time (4)(5)
4. During the tS sample time the input capacitance Cain can be charged/discharged by the external source.
The internal resistance of the analog source must allow the capacitance to reach its final voltage level
within the tS sample time. After the end of the tS sample time, changes of the analog input voltage have no
effect on the conversion result. Values for the tSC sample clock depend on the programming. Referring to
the tC conversion time formula of section 20.3.2 and to the table 39 of page 156:
- tS min = 2 tSC min = 2 tCC min = 2 x 24 x TCL = 48 TCL
- tS max = 2 tSC max = 2 x 8 tCC max = 2 x 8 x 96 TCL = 1536 TCL
TCL is defined in section 20.4.5 at page 159.
5. This parameter is fixed by ADC control logic.
48 TCL 1 536 TCL
tCCC Conversion time (6)(5)
6. The conversion time formula is:
- tC = 14 tCC + tS + 4 TCL (= 14 tCC + 2 tSC + 4 TCL)
The tC parameter includes the tS sample time, the time for determining the digital result and the time to load
the result register with the result of the conversion. Values for the tCC conversion clock depend on the
programming. Referring to the table 39 of page 156:
- tC min = 14 tCC min + tS min + 4 TCL = 14 x 24 x TCL + 48 TCL + 4 TCL = 388 TCL
- tC max = 14 tCC max + tS max + 4 TCL = 14 x 96 TCL + 1536 TCL + 4 TCL = 2884 TCL
388 TCL 2 884 TCL
DNL CC Differential Nonlinearity (7) -0.5 +0.5 LSB
INL CC Integral Nonlinearity (7) -1.5 +1.5 LSB
OFS CC Offset Error (7) -1.0 +1.0 LSB
TUE CC Total unadjusted error (7) -2.0 +2.0 LSB
RASRC SR Internal resistance of analog
source tS in [ns] (4)(3) –(tS / 150) -
0.25 kΩ
K CC Coupling Factor between inputs (8)(3) –1/500
ST10F280 Electri cal ch ara cter ist ics
Doc ID 8673 Rev. 3 209/239
20.3.2 Conversion timing control
When a conversion is started, first the capacitances of the converter are loaded via the
respective analog input pin to the current analog input voltage. The time to load the
capacitances is referred to as the sample time ts. Next the sampled voltage is converted to a
digital value in 10 successive steps, which correspond to the 10-bit resolution of the ADC.
The next 4 steps are used for equalizing internal levels (and are keep for exact timing
matching with the 10-bit A/D converter module implemented in ST10F168).
The current that has to be drawn from the sources for sampling and changing charges
depends on the time that each respective step takes, because the capacitors must reach
their final voltage level within the given time, at least with a certain approximation. The
maximum current, however, that a source can deliver, depends on its internal resistance.
The sample time tS (= 2 tSC) and the conversion time tC (= 14 tCC + 2 tSC + 4 TCL) can be
programmed relatively to the ST10F280 CPU clock. This allows adjusting the A/D converter
of the ST10F280 to the properties of the system:
Fast Conversion can be achieved by programming the respective times to their absolute
possible minimum. This is preferable for scanning high frequency signals. The internal
resistance of analog source and analog supply must be sufficiently low, however.
High Internal Resistance can be achieved by programming the respective times to a higher
value, or the possible maximum. This is preferable when using analog sources and supply
with a high internal resistance in order to keep the current as low as possible. However, the
conversion rate in this case may be considerably lower.
The conversion times are programmed via the upper four bit of register ADCON. Bit field
ADCTC (conversion time control) selects the basic conversion clock tCC, used for the 14
steps of converting. The sample time tS is a multiple of this conversion time and is selected
by bit field ADSTC (sample time control). The table below lists the possible combinations.
The timings refer to the unit TCL, where fCPU = 1/2 TCL.
7. DNL, INL, TUE are tested at VAREF =5.0V, VAGND =0V, V
CC = 4.9V. It is guaranteed by design
characterization for all other voltages within the defined voltage range.
‘LSB’ has a value of VAREF / 1024.
The specified TUE is guaranteed only if an overload condition (see IOV specification) occurs on maximum
2 not selected analog input pins and the absolute sum of input overload currents on all analog input pins
does not exceed 10mA.
8. The coupling factor is measured on a channel while an overload condition occurs on the adjacent not
selected channel with an absolute overload current less than 10mA.
Table 44. ADC sampling and conversion timing
ADCTC
Conversion clock tCC
ADSTC
Sample clock tSC
TCL = 1/2 x fXTAL At fCPU = 40MHz tSC = At fCPU = 40MHz
and ADCTC = 00
00 TCL x 24 0.3μs00t
CC 0.3μs
01 Reserved, do not
use Reserved 01 tCC x 2 0.6μs
10 TCL x 96 1.2 μs10t
CC x 4 1.2μs
11 TCL x 48 0.6 μs11t
CC x 8 2.4μs
Ele ctrical characteristics ST10F280
210/239 Doc ID 8673 Rev. 3
A complete conversion will take 14 tCC + 2 tSC + 4 TCL (fastest conversion rate = 4.85μs at
40MHz). This time includes the conversion itself, the sample time and the time required to
transfer the digital value to the result register.
20.4 AC characteristics
20.4.1 Test waveforms
Figure 75. Input / output waveforms
Figure 76. Float waveforms
20.4.2 Definition of internal timing
The internal operation of the ST10F280 is controlled by the internal CPU clock fCPU. Both
edges of the CPU clock can trigger internal (for example pipeline) or external (for example
bus cycles) operations.
The specification of the external timing (AC Characteristics) therefore depends on the time
between two consecutive edges of the CPU clock, called “TCL”.
The CPU clock signal can be generated by different mechanisms. The duration of TCL and
its variation (and also the derived external timing) depends on the mechanism used to
generate fCPU.
This influence must be regarded when calculating the timings for the ST10F280.
The example for PLL operation shown in Figure 73 refers to a PLL factor of 4.
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ST10F280 Electri cal ch ara cter ist ics
Doc ID 8673 Rev. 3 211/239
The mechanism used to generate the CPU clock is selected during reset by the logic levels
on pins P0.15-13 (P0H.7-5).
Figure 77. Generation mechanisms for the CPU clock
20.4.3 Clock generation modes
The Table 45 associates the combinations of these three bit with the respective clock
generation mode.
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Table 45. CPU frequency generation
P0H.7 P0H.6 P0H.5 CPU frequency
fCPU = fXTAL x F External clock input
range(1) Notes
11 1 f
XTAL x 4 2.5 to 10MHz Default configuration
11 0 f
XTAL x 3 3.33 to 13.33MHz
10 1 f
XTAL x 2 5 to 20MHz
10 0 f
XTAL x 5 2 to 8MHz
01 1 f
XTAL x 1 1 to 40MHz Direct drive(2)(3)
01 0 f
XTAL x 10 1 to 4MHz
00 1 f
XTAL x 0.5 2 to 80MHz CPU clock via
prescaler(4)
00 0 f
XTAL x 2.5 4 to 16MHz
1. The external clock input range refers to a CPU clock range of 1...40MHz.
2. The maximum depends on the duty cycle of the external clock signal.
3. The PLL free-running frequency is from 2 to 10MHz.
Ele ctrical characteristics ST10F280
212/239 Doc ID 8673 Rev. 3
20.4.4 Prescaler operation
When pins P0.15-13 (P0H.7-5) equal ’001’ during reset, the CPU clock is derived from the
internal oscillator (input clock signal) by a 2:1 prescaler.
The frequency of fCPU is half the frequency of fXTAL and the high and low time of fCPU (i.e.
the duration of an individual TCL) is defined by the period of the input clock fXTAL.
The timings listed in the AC Characteristics that refer to TCL therefore can be calculated
using the period of fXTAL for any TCL.
Note that if the bit OWDDIS in SYSCON register is cleared, the PLL runs on its free-running
frequency and delivers the clock signal for the Oscillator Watchdog. If bit OWDDIS is set,
then the PLL is switched off.
20.4.5 Direct drive
When pins P0.15-13 (P0H.7-5) equal ’011’ during reset the on-chip phase locked loop is
disabled and the CPU clock is directly driven from the internal oscillator with the input clock
signal.
The frequency of fCPU directly follows the frequency of fXTAL so the high and low time of fCPU
(i.e. the duration of an individual TCL) is defined by the duty cycle of the input clock fXTAL.
Therefor, the timings given in this chapter refer to the minimum TCL. This minimum value
can be calculated by the following formula:
For two consecutive TCLs, the deviation caused by the duty cycle of fXTAL is compensated,
so the duration of 2 TCL is always 1/fXTAL.
The minimum value TCLmin has to be used only once for timings that require an odd number
of TCLs (1,3,...). Timings that require an even number of TCLs (2,4,...) may use the formula:
Note: The address float timings in Multiplexed bus mode (t11 and t45) use the maximum duration of
TCL (TCLmax = 1/fXTAL x DCmax) instead of TCLmin.
If the bit OWDDIS in SYSCON register is cleared, the PLL runs on its free-running
frequency and delivers the clock signal for the Oscillator Watchdog. If bit OWDDIS is set,
then the PLL is switched off.
4. The maximum input frequency is 25MHz when using an external crystal with the internal oscillator; providing that internal
serial resistance of the crystal is less than 40Ω. However, higher frequencies can be applied with an external clock source
on pin XTAL1, but in this case, the input clock signal must reach the defined levels VIL and VIH2..
TCLmin 1f⁄XTALlxlDCmin
=
DC duty cycle=
2TCL 1 fXTAL
⁄=
ST10F280 Electri cal ch ara cter ist ics
Doc ID 8673 Rev. 3 213/239
20.4.6 Oscillator Watchdog (OWD)
An on-chip watchdog oscillator is implemented in the ST10F280. This feature is used for
safety operation with external crystal oscillator (using direct drive mode with or without
prescaler). This watchdog oscillator operates as following:
The reset default configuration enables the watchdog oscillator. It can be disabled by setting
the OWDDIS (bit 4) of SYSCON register.
When the OWD is enabled, the PLL runs at its free-running frequency, and it increments the
watchdog counter. The PLL free-running frequency is from 2 to 10MHz. On each transition
of external clock, the watchdog counter is cleared. If an external clock failure occurs, then
the watchdog counter overflows (after 16 PLL clock cycles).
The CPU clock signal will be switched to the PLL free-running clock signal, and the oscillator
watchdog Interrupt Request (XP3INT) is flagged. The CPU clock will not switch back to the
external clock even if a valid external clock exits on XTAL1 pin. Only a hardware reset can
switch the CPU clock source back to direct clock input.
When the OWD is disabled, the CPU clock is always external oscillator clock and the PLL is
switched off to decrease consumption supply current.
20.4.7 Phase locked loop
For all other combinations of pins P0.15-13 (P0H.7-5) during reset the on-chip phase locked
loop is enabled and it provides the CPU clock (see Ta ble 4 5 ). The PLL multiplies the input
frequency by the factor F which is selected via the combination of pins P0.15-13 (fCPU =
fXTAL x F). With every F’th transition of fXTAL the PLL circuit synchronizes the CPU clock to
the input clock. This synchronization is done smoothly, so the CPU clock frequency does not
change abruptly.
Due to this adaptation to the input clock the frequency of fCPU is constantly adjusted so it is
locked to fXTAL. The slight variation causes a jitter of fCPU which also effects the duration of
individual TCLs.
The timings listed in the AC Characteristics that refer to TCLs therefore must be calculated
using the minimum TCL that is possible under the respective circumstances.
The real minimum value for TCL depends on the jitter of the PLL. The PLL tunes fCPU to
keep it locked on fXTAL. The relative deviation of TCL is the maximum when it is referred to
one TCL period. It decreases according to the formula and to the Figure 74 given below. For
N periods of TCL the minimum value is computed using the corresponding deviation DN:
where N = number of consecutive TCL periods and 1 ≤ N ≤ 40. So for a period of 3 TCL
periods (N = 3):
D3 = 4 - 3/15 = 3.8%
3TCL
min = 3 TCLNOM x (1 - 3.8/100) = 3 TCLNOM x 0.962
3TCL
min = (36.075ns at fCPU = 40MHz)
TCLMIN TCLNOM 1
DN
100
-------------–
×=
DN4N15)%[]⁄–(±=
Ele ctrical characteristics ST10F280
214/239 Doc ID 8673 Rev. 3
This is especially important for bus cycles using wait states and e.g. for the operation of timers,
serial interfaces, etc. For all slower operations and longer periods (e.g. pulse train generation or
measurement, lower Baud rates, etc.) the deviation caused by the PLL jitter is negligible.
Figure 78. Approximated maximum PLL Jitter
20.4.8 Ex te rnal cloc k drive XTAL1
VDD = 5 V ± 10%, VSS = 0 V, TA = -40°C to 125 °C
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Table 46. External clock drive XTAL1
Parameter Symbol fCPU = fXTAL f
CPU = fXTAL / 2 fCPU = fXTAL x F
F = 2 / 2.5 / 3 / 4 / 5 /
10 Unit
Min. Max. Min. Max. Min. Max.
Oscillator period tOSC SR 25 (1)
1. Theoretical minimum. The real minimum value depends on the duty cycle of the input clock signal. 25MHz
is the maximum input frequency when using an external crystal oscillator. However, 40MHz can be applied
with an external clock source.
– 12.5 – 40 x N 100 x N ns
High time t1SR 10 (2)
2. The input clock signal must reach the defined levels VIL and VIH2
–5
(2) –10
(2) –ns
Low time t2SR 10 (2) –5
(2) –10
(2) –ns
Rise time t3SR – 3 (2) –3
(2) –3
(2) ns
Fall time t4SR – 3 (2) –3
(2) –3
(2) ns
ST10F280 Electri cal ch ara cter ist ics
Doc ID 8673 Rev. 3 215/239
Figure 79. External clock drive XTAL1
20.4.9 Memory cycle variables
The tables below use three variables which are derived from the BUSCONx registers and
represent the special characteristics of the programmed memory cycle. The following table
describes, how these variables are to be computed.
20.4.10 Multiplexed bus
VDD = 5 V ± 10%, VSS = 0 V, TA = -40°C to +125°C, CL = 50 pF,
ALE cycle time = 6 TCL + 2 tA + tC + tF (75 ns at 40 MHz CPU clock without wait states).
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Table 47. Memory cycle variables
Description Symbol Values
ALE Extension tATCL x [ALECTL]
Memory Cycle Time wait states tC2 TCL x (15 - [MCTC])
Memory Tri-state Time tF2 TCL x (1 - [MTTC])
Table 48. Multiplexed bus characteristics
Symbol Parameter
Max. CPU Clock
= 40MHz Variable CPU Clock
1/2 TCL = 1 to 40MHz
Unit
Min. Max. Min. Max.
t5CC ALE high time 4 + tA–TCL - 8.5 + t
A–ns
t6CC Address setup to ALE 2 + tA– TCL - 10.5 + tA–ns
t7CC Address hold after ALE (1) 4 + tA–TCL - 8.5 + t
A–ns
t8CC ALE falling edge to RD, WR
(with R/W-delay) 4 + tA–TCL - 8.5 + t
A–ns
t9CC ALE falling edge to RD, WR
(no R/W-delay)
-8.5 +
tA
–-8.5 + t
A–ns
t10 CC Address float after RD, WR
(with R/W-delay) (1) –6 – 6ns
t11 CC Address float after RD, WR
(no R/W-delay)(1) – 18.5 – TCL + 6 ns
t12 CC RD, WR low time (with R/W-
delay)
15.5 +
tC
–2 TCL -9.5 + t
C–ns
Ele ctrical characteristics ST10F280
216/239 Doc ID 8673 Rev. 3
t13 CC RD, WR low time (no R/W-
delay) 28 + tC–3 TCL -9.5 + t
C–ns
t14 SR RD to valid data in (with
R/W-delay) –6 + t
C–2 TCL - 19 + t
Cns
t15 SR RD to valid data in (no R/W-
delay) – 18.5 + tC–3 TCL - 19 + t
Cns
t16 SR ALE low to valid data in – 18.5
+ tA + tC
–3 TCL - 19
+ tA + tC
ns
t17 SR Address/Unlatched CS to
valid data in –22 + 2t
A + tC–4 TCL - 28
+ 2tA + tC
ns
t18 SR Data hold after RD rising
edge 0– 0 –ns
t19 SR Data float after RD (1) – 16.5 + tF–2 TCL - 8.5 +
tF
ns
t22 CC Data valid to WR 10 + tC– 2 TCL -15 + tC–ns
t23 CC Data hold after WR 4 + tF–2 TCL - 8.5 +
tF
–ns
t25 CC ALE rising edge after RD,
WR 15 + tF– 2 TCL -10 + tF–ns
t27 CC Address/Unlatched CS hold
after RD, WR 10 + tF– 2 TCL -15 + tF–ns
t38 CC ALE falling edge to Latched
CS -4 - tA10 - tA-4 - tA10 - tAns
t39 SR Latched CS low to Valid Data
In –18.5 + tC +
2tA
–3 TCL - 19
+ tC + 2tA
ns
t40 CC Latched CS hold after RD,
WR 27 + tF–3 TCL - 10.5 +
tF
–ns
t42 CC ALE fall. edge to RdCS,
WrCS (with R/W delay) 7 + tA– TCL - 5.5+ tA–ns
t43 CC ALE fall. edge to RdCS,
WrCS (no R/W delay)
-5.5 +
tA
–-5.5 + t
A–ns
t44 CC Address float after RdCS,
WrCS (with R/W delay)(1) –0 – 0ns
t45 CC Address float after RdCS,
WrCS (no R/W delay)(1) –12.5 – TCLns
t46 SR RdCS to Valid Data In (with
R/W delay) –4 + t
C–2 TCL - 21 + t
Cns
t47 SR RdCS to Valid Data In (no
R/W delay) – 16.5 + tC–3 TCL - 21 + t
Cns
t48 CC RdCS, WrCS Low Time (with
R/W delay)
15.5 +
tC
–2 TCL - 9.5 +
tC
–ns
Table 48. Multiplexed bus characteristics (continued)
Symbol Parameter
Max. CPU Clock
= 40MHz Variable CPU Clock
1/2 TCL = 1 to 40MHz
Unit
Min. Max. Min. Max.
ST10F280 Electri cal ch ara cter ist ics
Doc ID 8673 Rev. 3 217/239
t49 CC RdCS, WrCS Low Time (no
R/W delay) 28 + tC–3 TCL - 9.5 +
tC
–ns
t50 CC Data valid to WrCS 10 + tC– 2 TCL - 15+ tC–ns
t51 SR Data hold after RdCS 0– 0 –ns
t52 SR Data float after RdCS (1) – 16.5 + tF– 2 TCL - 8.5+tFns
t54 CC Address hold after
RdCS, WrCS 6 + tF– 2 TCL - 19 + tF–ns
t56 CC Data hold after WrCS 6 + tF– 2 TCL - 19 + tF–ns
1. Partially tested, guaranteed by design characterization.
Table 48. Multiplexed bus characteristics (continued)
Symbol Parameter
Max. CPU Clock
= 40MHz Variable CPU Clock
1/2 TCL = 1 to 40MHz
Unit
Min. Max. Min. Max.
Ele ctrical characteristics ST10F280
218/239 Doc ID 8673 Rev. 3
Figure 80. External memory cycle: multiplexed bus, with / without read / write delay,
normal ALE
Data In
Data Out
Address
Address
t
38
t
10
Read Cycle
Write Cycle
t
5
t
16
t
39
t
40
t
25
t
27
t
18
t
14
t
22
t
23
t
12
t
8
t
8
t
6m
t
19
Address
t
17
t
6
t
7
t
9
t
11
t
13
t
15
t
16
t
12
t
13
Address
t
9
t
17
t
6
t
27
CLKOUT
ALE
CSx
A23-A16
(A15-A8)
A
ddress/Data
RD
WR
WRL
BHE
WRH
Bus (P0)
Address/Data
Bus (P0)
GAPGCFT00934
ST10F280 Electri cal ch ara cter ist ics
Doc ID 8673 Rev. 3 219/239
Figure 81. External memory cycle: multiplexed bus, with / without read / write delay,
extended ALE
Data Out
Address
Data In
Address
Address
t
5
t
16
t
6
t
7
t
39
t
40
t
14
t
8
t
18
t
23
t
6
t
27
t
38
t
10
t
19
t
25
t
17
t
9
t
11
t
15
t
12
t
13
t
8
t
10
t
9
t
11
t
12
t
13
t
22
t
27
t
17
t
6
Read Cycle
Write Cycle
CLKOUT
ALE
CSx
A23-A16
(A15-A8)
RD
WR
WRL
BHE
WRH
Address/Data
Bus (P0)
Address/Data
Bus (P0)
GAPGCFT00935
Ele ctrical characteristics ST10F280
220/239 Doc ID 8673 Rev. 3
Figure 82. External memory cycle: multiplexed bus, with / without read / write delay,
normal ALE, read / write chip select
Read Cycle
Write Cycle
CLKOUT
ALE
A23-A16
(A15-A8)
BHE
Data In
Data Out
Address
Address
t
44
t
5
t
16
t
25
t
27
t
51
t
46
t
50
t
56
t
48
t
42
t
42
t
6
t
52
Address
t
17
t
6
t
7
t
43
t
45
t
49
t
47
t
16
t
48
t
49
Address
t
43
RdCSx
WrCSx
Address/Data
Bus (P0)
Address/Data
Bus (P0)
GAPGCFT00936
ST10F280 Electri cal ch ara cter ist ics
Doc ID 8673 Rev. 3 221/239
Figure 83. External memory cycle: multiplexed bus, with / without read / write delay,
extended ALE, read / write chip select
Data Out
Address
Data In
Address
Address
t
5
t
16
t
6
t
7
t
46
t
42
t
42
t
50
t
18
t
56
t
6
t
54
t
44
t
19
t
25
t
17
t
43
t
45
t
47
t
48
t
49
t
49
t
43
t
48
t
44
t
45
Read Cycle
Write Cycle
CLKOUT
ALE
A23-A16
(A15-A8)
BHE
RdCSx
WrCSx
Address/Data
Bus (P0)
Address/Data
Bus (P0)
GAPGCFT00937
Ele ctrical characteristics ST10F280
222/239 Doc ID 8673 Rev. 3
20.4.11 Demultiplexed bus
VDD = 5 V ± 10%, VSS = 0 V, TA = -40°C to 125°C, CL = 50 pF,
ALE cycle time = 4 TCL + 2tA + tC + tF (50 ns at 40 MHz CPU clock without wait states).
Table 49. Demultiplexed bus characteristics
Symbol Parameter
Maximum CPU Clock
= 40MHz Variable CPU Clock
1/2 TCL = 1 to 40MHz
Unit
Min. Max. Min. Max.
t5CC ALE high time 4 + tA–TCL - 8.5 + t
A–ns
t6CC Address setup to ALE 2 + tA– TCL - 10.5 + tA–ns
t80 CC
Address/Unlatched CS
setup to RD, WR (with
R/W-delay)
16.5 + 2tA–2 TCL - 8.5 +
2tA
–ns
t81 CC
Address/Unlatched CS
setup to RD, WR (no R/W-
delay)
4 + 2tA– TCL - 8.5 + 2tA–ns
t12 CC RD, WR low time (with
R/W-delay) 15.5 + tC–2 TCL - 9.5 +
tC
–ns
t13 CC RD, WR low time (no R/W-
delay) 28 + tC–3 TCL - 9.5 +
tC
–ns
t14 SR RD to valid data in (with
R/W-delay) –6 + t
C– 2 TCL - 19 + tCns
t15 SR RD to valid data in (no
R/W-delay) – 18.5 + tC– 3 TCL - 19 + tCns
t16 SR ALE low to valid data in – 18.5 + tA +
tC
–3 TCL - 19
+ tA + tC
ns
t17 SR Address/Unlatched CS to
valid data in –22 + 2tA +
tC
–4 TCL - 28
+ 2tA + tC
ns
t18 SR Data hold after RD rising
edge 0– 0 –ns
t20 SR Data float after RD rising
edge (with R/W-delay) (1)(2) –16.5 + t
F–2 TCL - 8.5
+ tF + 2tA 1 ns
t21 SR Data float after RD rising
edge (no R/W-delay) (1)(2) –4 + t
F–TCL - 8.5
+ tF + 2tA 1 ns
t22 CC Data valid to WR 10 + tC– 2 TCL - 15 + tC–ns
t24 CC Data hold after WR 4 + tF–TCL - 8.5 + t
F–ns
t26 CC ALE rising edge after RD,
WR -10 + tF–-10 + t
F–ns
t28 CC Address/Unlatched CS
hold after RD, WR (3)
0 (no tF)
-5 + tF
(tF > 0)
–
0 (no tF)
-5 + tF
(tF > 0)
–ns
t28h CC Address/Unlatched CS
hold after WRH -5 + tF–-5 + t
F–ns
ST10F280 Electri cal ch ara cter ist ics
Doc ID 8673 Rev. 3 223/239
t38 CC ALE falling edge to Latched
CS -4 - tA6 - tA-4 - tA6 - tAns
t39 SR Latched CS low to Valid
Data In –18.5
+ tC + 2tA
–3 TCL - 19
+ tC + 2tA
ns
t41 CC Latched CS hold after RD,
WR 2 + tF– TCL - 10.5 + tF–ns
t82 CC Address setup to RdCS,
WrCS (with R/W-delay) 14.5 + 2tA–2 TCL - 10.5 +
2tA
–ns
t83 CC Address setup to RdCS,
WrCS (no R/W-delay) 2 + 2tA–TCL - 10.5 +
2tA
–ns
t46 SR RdCS to Valid Data In (with
R/W-delay) –4 + t
C– 2 TCL - 21 + tCns
t47 SR RdCS to Valid Data In (no
R/W-delay) – 16.5 + tC– 3 TCL - 21 + tCns
t48 CC RdCS, WrCS Low Time
(with R/W-delay) 15.5 + tC–2 TCL - 9.5
+ tC
–ns
t49 CC RdCS, WrCS Low Time (no
R/W-delay) 28 + tC–3 TCL - 9.5 +
tC
–ns
t50 CC Data valid to WrCS 10 + tC– 2 TCL - 15 + tC–ns
t51 SR Data hold after RdCS 0– 0 –ns
t53 SR Data float after RdCS
(with R/W-delay) (2) –16.5 + t
F–2 TCL - 8.5 +
tF
ns
t68 SR Data float after RdCS
(no R/W-delay) (2) –4 + t
F– TCL - 8.5 + tFns
t55 CC Address hold after
RdCS, WrCS -8.5 + tF–-8.5 + t
F–ns
t57 CC Data hold after WrCS 2 + tF– TCL - 10.5 + tF–ns
1. R/W-delay and tA refer to the next following bus cycle.
2. Partially tested, guaranteed by design characterization.
3. Read data are latched with the same clock edge that triggers the address change and the rising RD edge.
Therefore address changes before the end of RD have no impact on read cycles.
Table 49. Demultiplexed bus characteristics (continued)
Symbol Parameter
Maximum CPU Clock
= 40MHz Variable CPU Clock
1/2 TCL = 1 to 40MHz
Unit
Min. Max. Min. Max.
Ele ctrical characteristics ST10F280
224/239 Doc ID 8673 Rev. 3
Figure 84. External memory cycle: demultiplexed bus, with / without read / write
delay, normal ALE
1. Un-latched CSx = t41u = t41 TCL =10.5 + tF.
Write Cycle
CLKOUT
ALE
A23-A16
A15-A0 (P1)
BHE
WR
WRL
WRH
Data In
Data Out
t
38
t
5
t
16
t
39
t
41
t
18
t
14
t
22
t
12
Address
t
17
t
13
t
15
t
12
t
13
t
21
t
20
t
81
t
80
t
26
t
24
t
17
t
6
t
41u
t
6
t
80
t
81
t
28
(or
t
28h
)
CSx
Read Cycle
Data Bus (P0)
RD
1)
(D15-D8) D7-D0
Data Bus (P0)
(D15-D8) D7-D0
GAPGCFT00938
ST10F280 Electri cal ch ara cter ist ics
Doc ID 8673 Rev. 3 225/239
Figure 85. External memory cycle: demultiplexed bus, with / without read / write
delay, extended ALE
Address
t
5
t
16
t
39
t
41
t
14
t
24
t
6
t
38
t
20
t
26
t
17
t
15
t
12
t
13
t
12
t
13
t
22
Data In
t
18
t
21
t
6
t
17
t
28
t
28
Data Out
t
80
t
81
t
80
t
81
Read Cycle
Write Cycle
CLKOUT
ALE
CSx
RD
WR
WRL
WRH
Data Bus (P0)
(D15-D8) D7-D0
Data Bus (P0)
(D15-D8) D7-D0
A23-A16
A15-A0 (P1)
BHE
GAPGCFT00939
Ele ctrical characteristics ST10F280
226/239 Doc ID 8673 Rev. 3
Figure 86. External memory cycle: demultiplexed bus, with / without read / write
delay, normal ALE, read / write chip select
Read Cycle
Write Cycle
CLKOUT
ALE
Data In
Data Out
t
5
t
16
t
51
t
46
t
50
t
48
Address
t
17
t
49
t
47
t
48
t
49
t
68
t
53
t
83
t
82
t
26
t
57
t
55
t
6
t
82
t
83
RdCSx
WrCSx
Data Bus (P0)
(D15-D8) D7-D0
Data Bus (P0)
(D15-D8) D7-D0
A23-A16
A15-A0 (P1)
BHE
GAPGCFT00940
ST10F280 Electri cal ch ara cter ist ics
Doc ID 8673 Rev. 3 227/239
Figure 87. External memory cycle: demultiplexed bus, no read / write delay,
extended ALE, read /write chip select
20.4.12 CLKOUT and READY
VDD = 5 V ± 10%, VSS = 0 V, TA = -40°C to 125°C, CL = 50 pF
Address
t
5
t
16
t
46
t
57
t
6
t
53
t
26
t
17
t
47
t
48
t
49
t
48
t
49
t
50
Data In
t
51
t
68
t
55
Data Out
t
82
t
83
t
82
t
83
Read Cycle
Write Cycle
CLKOUT
ALE
RdCSx
WrCSx
Data Bus (P0)
(D15-D8) D7-D0
Data Bus (P0)
(D15-D8) D7-D0
A23-A16
A15-A0 (P1)
BHE
GAPGCFT00941
Table 50. CLKOUT and READY characteristics
Symbol Parameter
Maximum CPU Clock
= 40MHz Variable CPU Clock
1/2 TCL = 1 to 40MHz
Unit
Min. Max. Min. Max.
t29 CC CLKOUT cycle time 25 25 2 TCL 2TCL ns
t30 CC CLKOUT high time 4 – TCL – 8.5 – ns
t31 CC CLKOUT low time 3 – TCL – 9.5 – ns
t32 CC CLKOUT rise time – 4 – 4 ns
t33 CC CLKOUT fall time – 4 – 4 ns
Ele ctrical characteristics ST10F280
228/239 Doc ID 8673 Rev. 3
t34 CC CLKOUT rising edge to
ALE falling edge -2 + tA8 + tA-2 + tA8 + tAns
t35 SR Synchronous READY
setup time to CLKOUT 12.5 – 12.5 – ns
t36 SR Synchronous READY hold
time after CLKOUT 2– 2 –ns
t37 SR Asynchronous READY low
time 35 – 2 TCL + 10 – ns
t58 SR Asynchronous READY
setup time (1) 12.5 – 12.5 – ns
t59 SR Asynchronous READY
hold time (1) 2– 2 –ns
t60 SR
Asynchronous READY
hold time after RD, WR
high (Demultiplexed
Bus)(2)
00 + 2tA + tC +
tF (2) 0
TCL - 12.5
+ 2tA + tC + tF
(2)
ns
1. These timings are given for test purposes only, in order to assure recognition at a specific clock edge.
2. Demultiplexed bus is the worst case. For multiplexed bus 2 TCL are to be added to the maximum values.
This adds even more time for deactivating READY.
The 2tA and tC refer to the next following bus cycle, tF refers to the current bus cycle.
Table 50. CLKOUT and READY characteristics (continued)
Symbol Parameter
Maximum CPU Clock
= 40MHz Variable CPU Clock
1/2 TCL = 1 to 40MHz
Unit
Min. Max. Min. Max.
ST10F280 Electri cal ch ara cter ist ics
Doc ID 8673 Rev. 3 229/239
Figure 88. CLKOUT and READY
1. Cycle as programmed, including MCTC wait states (Example shows 0 MCTC WS).
2. The leading edge of the respective command depends on R/W-delay.
3. READY sampled HIGH at this sampling point generates a READY controlled wait state, READY sampled
LOW at this sampling point terminates the currently running bus cycle.
4. READY may be deactivated in response to the trailing (rising) edge of the corresponding command (RD or
WR).
5. If the Asynchronous READY signal does not fulfill the indicated setup and hold times with respect to
CLKOUT (e.g. because CLKOUT is not enabled), it must fulfill t37 in order to be safely synchronized. This is
guaranteed, if READY is removed in response to the command (see Note 4)).
6. Multiplexed bus modes have a MUX wait state added after a bus cycle, and an additional MTTC wait state
may be inserted here.
For a multiplexed bus with MTTC wait state this delay is 2 CLKOUT cycles, for a demultiplexed bus without
MTTC wait state this delay is zero.
7. The next external bus cycle may start here.
20.4.13 External bus arbitration
VDD = 5 V ± 10%, VSS = 0 V, TA = -40°C to 125°C, CL = 50 pF
t30
t34
t35 t36 t35 t36
t58 t59 t58 t59
wait state
READY MUX / Tri-state 6)
t32 t33
t29
Running cycle 1)
t31
t37
3) 3)
5)
t60 4)
6)
2)
7)
3) 3)
CLKOUT
ALE
RD, WR
Synchronous
Asynchronous
READY
READY
GAPGCFT00942
Table 51. External bus arbitration
Symbol Parameter
Maximum CPU Clock
= 40MHz Variable CPU Clock
1/2 TCL = 1 to 40MHz
Unit
Min. Max. Min. Max.
t61 SR HOLD input setup time to
CLKOUT 15 – 15 – ns
t62 CC CLKOUT to HLDA high or
BREQ low delay – 12.5 – 12.5 ns
t63 CC CLKOUT to HLDA low or
BREQ high delay – 12.5 – 12.5 ns
Ele ctrical characteristics ST10F280
230/239 Doc ID 8673 Rev. 3
Figure 89. External bus arbitration, releasing the bus
1. The ST10F280 will complete the currently running bus cycle before granting bus access.
2. This is the first possibility for BREQ to become active.
3. The CS outputs will be resistive high (pull-up) after t64.
t64 CC CSx release (1) –15 – 15ns
t65 CC CSx drive -4 15 -4 15 ns
t66 CC Other signals release(1) –15 – 15ns
t67 CC Other signals drive -4 15 -4 15 ns
1. Partially tested, guaranteed by design characterization
Table 51. External bus arbitration (continued)
Symbol Parameter
Maximum CPU Clock
= 40MHz Variable CPU Clock
1/2 TCL = 1 to 40MHz
Unit
Min. Max. Min. Max.
t61
t63
t66
1)
t64
1)
2)
t62
3)
CLKOUT
HOLD
HLDA
BREQ
Others
CSx
(P6.x)
GAPGCFT00943
ST10F280 Electri cal ch ara cter ist ics
Doc ID 8673 Rev. 3 231/239
Figure 90. External bus arbitration, (regaining the bus)
1. 1. This is the last chance for BREQ to trigger the indicated regain-sequence. Even if BREQ is activated
earlier, the regain-sequence is initiated by HOLD going high. Please note that HOLD may also be
deactivated without the ST10F280 requesting the bus
2. The next ST10F280 driven bus cycle may start here.
20.4.14 High-speed synchronous serial interface (SSC) timing
Master mode
VCC = 5 V ±10%, VSS = 0 V, CPU clock = 40 MHz, TA = -40°C to 125°C, CL = 50 pF
CLKOUT
HOLD
HLDA
Other
Signals
t62
CSx
(On P6.x)
t67
t62
1)
2)
t65
t61
BREQ
t63
t62
GAPGCFT00944
Table 52. SSC master timing
Symbol Parameter
Maximum Baud rate =
10M Baud (<SSCBR> =
0001h)
Variable Baud rate
(<SSCBR>=0001h-
FFFFh)
Unit
Min. Max. Min. Max.
t300 CC SSC clock cycle time 100 100 8 TCL 262144
TCL ns
t301 CC SSC clock high time 40 – t300/2 - 10 – ns
t302 CC SSC clock low time 40 – t300/2 - 10 – ns
t303 CC SSC clock rise time – 10 – 10 ns
t304 CC SSC clock fall time – 10 – 10 ns
t305 CC Write data valid after shift
edge – 15 – 15 ns
t306 CC Write data hold after shift
edge(1) -2 – -2 – ns
Ele ctrical characteristics ST10F280
232/239 Doc ID 8673 Rev. 3
The formula for SSC Clock Cycle time is: t300 = 4 TCL * (<SSCBR> + 1)
Where <SSCBR> represents the content of the SSC Baud rate register, taken as unsigned
16-bit integer.
Figure 91. SSC master timing
1. The phase and polarity of shift and latch edge of SCLK is programmable. This figure uses the leading clock
edge as shift edge (drawn in bold), with latch on trailing edge (SSCPH = 0b), Idle clock line is low, leading
clock edge is low-to-high transition (SSCPO = 0b).
2. The bit timing is repeated for all bits to be transmitted or received.
t307p SR
Read data setup time
before latch edge, phase
error detection on
(SSCPEN = 1)
37.5 – 2 TCL +
12.5 –ns
t308p SR
Read data hold time after
latch edge, phase error
detection on (SSCPEN = 1)
50 – 4 TCL – ns
t307 SR
Read data setup time
before latch edge, phase
error detection off
(SSCPEN = 0)
25 – 2 TCL – ns
t308 SR
Read data hold time after
latch edge, phase error
detection off (SSCPEN = 0)
0–0–ns
1. Timing guaranteed by design.
Table 52. SSC master timing (continued)
Symbol Parameter
Maximum Baud rate =
10M Baud (<SSCBR> =
0001h)
Variable Baud rate
(<SSCBR>=0001h-
FFFFh)
Unit
Min. Max. Min. Max.
t
303
t
304
t
305
t
305
t
305
t
306
tiB tuO tsaLtiB tuO ts1 2nd Out Bit
t
300
t
302
t
301
1) 2)
t
307
2nd.In Bit
1st.In Bit
t
308
t
307
Last.In Bit
t
308
SCLK
MTSR
MRST
GAPGCFT00946
ST10F280 Electri cal ch ara cter ist ics
Doc ID 8673 Rev. 3 233/239
Slave mode
VCC = 5 V ±10%, VSS = 0 V, CPU clock = 40 MHz, TA = -40°C to 125°C, CL = 50 pF
The formula for SSC Clock Cycle time is: t310 = 4 TCL * (<SSCBR> + 1)
Where <SSCBR> represents the content of the SSC Baud rate register, taken as unsigned
16-bit integer.
Table 53. SSC slave timing
Symbol Parameter
Maximum Baud
rate=10MBd
(<SSCBR> = 0001h)
Variable Baud rate
(<SSCBR>=0001h-
FFFFh)
Unit
Min. Max. Min. Max.
t310 SR SSC clock cycle time 100 100 8 TCL 262144
TCL ns
t311 SR SSC clock high time 40 – t310/2 - 10 – ns
t312 SR SSC clock low time 40 – t310/2 - 10 – ns
t313 SR SSC clock rise time – 10 – 10 ns
t314 SR SSC clock fall time – 10 – 10 ns
t315 CC Write data valid after shift
edge –39–
2 TCL +
14 ns
t316 CC Write data hold after shift
edge 0–0–ns
t317p SR
Read data setup time before
latch edge, phase error
detection on (SSCPEN = 1)
62 – 4 TCL +
12 –ns
t318p(1)
1. Timing guaranteed by design.
SR
Read data hold time after
latch edge, phase error
detection on (SSCPEN = 1)
87 – 6 TCL +
12 –ns
t317 SR
Read data setup time before
latch edge, phase error
detection off (SSCPEN = 0)
6–6–ns
t318 SR
Read data hold time after
latch edge, phase error
detection off (SSCPEN = 0)
31 – 2 TCL + 6 – ns
Ele ctrical characteristics ST10F280
234/239 Doc ID 8673 Rev. 3
Figure 92. SSC slave timing
1. The phase and polarity of shift and latch edge of SCLK is programmable. This figure uses the leading clock
edge as shift edge (drawn in bold), with latch on trailing edge (SSCPH = 0b), Idle clock line is low, leading
clock edge is low-to-high transition (SSCPO = 0b).
2. The bit timing is repeated for all bits to be transmitted or received.
t
313
t
314
t
315
t
315
t
315
t
316
tiB tuO tsaLtiB tuO ts12nd Out Bit
t
310
t
312
t
311
1) 2)
t
317
2nd.In Bit1st.In Bit
t
318
t
317
Last.In Bit
t
318
SCLK
MRST
MTSR
GAPGCFT00947
ST10F280 Package information
Doc ID 8673 Rev. 3 235/239
21 Package information
21.1 ECOPACK®
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
21.2 PBGA 208 (23 x 23 x 1.96 mm) mechanical data
Figure 93. Package outline PBGA 208 (23 x 23 x 1.96 mm)
1. PBGA stands for Plastic Ball Grid Array.
2. The terminal A1 corner must be identified on the top surface of the package by using a corner chamfer, ink
or metallized markings, identation or other feature of package body or integral heastslug. A distinguishing
feature is allowable on the bottom of the package to identify the terminal A1 corner. Exact shape and size
of this feature is optional.
A1
E1
φ
b (208 + 25 BALLS)
U
T
R
P
N
M
L
K
10 11 12 13 14 15 16 17
000
6789
J
G
F
H
E
D
B
A
C
45123
A1 BALL PAD CORNER 2
f
E
e
e
D1
D
f
A2
A3
C
SEATING
PLANE
A
C
Package information ST10F280
236/239 Doc ID 8673 Rev. 3
Table 54. PBGA 208 (23 x 23 x 1.96 mm) mechanical data
Dimensions Millimeters Inches (approx)
Min. Typ. Max. Min. Typ. Max.
A 1.960 0.077
A1 0.500 0.600 0.700 0.019 0.024 0.028
A2 1.360 0.054
A3 0.560 0.022
φ
b 0.600 0.760 0.900 0.024 0.030 0.035
D 22.900 23.000 23.100 0.902 0.906 0.909
D1 20.320 0.800
E 22.900 23.000 23.100 0.902 0.906 0.909
E1 20.320 0.800
e 1.270 0.50
f 1.240 1.340 1.440 0.049 0.053 0.057
aaa 0.150 0.006
ST10F280 Ordering information
Doc ID 8673 Rev. 3 237/239
22 Ordering information
Table 55. Device summary
Order codes Package Packing Temperature range
ST10F280 PBGA 208 (23 x 23 x 1.96 mm) Tray -40°C to +125°C
ST10F280-Q3TR Tape and reel
ST10F280
Doc ID 8673 Rev. 3 239/239
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