© MOTOROLA, INC. 1995
M68300 Family
MC68332
User’s Manual
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MC68332
USER’S MANUAL
Paragraph Title Page
SECTION 1 INTRODUCTION
SECTION 2NOMENCLATURE
2.1 Symbols and Operators .................................................................................. 2-1
2.2 CPU32 Registers ............................................................................................ 2-2
2.3 Pin and Signal Mnemonics ............................................................................. 2-3
2.4 Register Mnemonics ....................................................................................... 2-4
2.5 Conventions ................................................................................................... 2-5
SECTION 3OVERVIEW
3.1 MC68332 Features ......................................................................................... 3-1
3.1.1 System Integration Module (SIM) ........................................................... 3-1
3.1.2 Central Processing Unit (CPU) ............................................................... 3-1
3.1.3 Time Processor Unit (TPU) .................................................................... 3-1
3.1.4 Queued Serial Module (QSM) ................................................................ 3-2
3.1.5 Static RAM Module with TPU Emulation Capability (TPURAM) ............. 3-2
3.2 System Block Diagram and Pin Assignment Diagrams .................................. 3-2
3.3 Pin Descriptions ............................................................................................. 3-5
3.4 Signal Descriptions ......................................................................................... 3-7
3.5 Intermodule Bus ............................................................................................. 3-9
3.6 System Memory Map ..................................................................................... 3-9
3.6.1 Internal Register Map ........................................................................... 3-10
3.6.2 Address Space Maps ........................................................................... 3-10
3.7 System Reset ...............................................................................................3-15
3.7.1 SIM Reset Mode Selection ................................................................... 3-15
3.7.2 MCU Module Pin Function During Reset ............................................. 3-16
SECTION 4 SYSTEM INTEGRATION MODULE
4.1 General ........................................................................................................... 4-1
4.2 System Configuration and Protection ............................................................. 4-2
4.2.1 Module Mapping ..................................................................................... 4-3
4.2.2 Interrupt Arbitration ................................................................................. 4-3
4.2.3 Show Internal Cycles .............................................................................. 4-4
4.2.4 Factory Test Mode ................................................................................. 4-4
4.2.5 Register Access ..................................................................................... 4-4
4.2.6 Reset Status ........................................................................................... 4-4
4.2.7 Bus Monitor ............................................................................................ 4-5
4.2.8 Halt Monitor ............................................................................................ 4-5
4.2.9 Spurious Interrupt Monitor ...................................................................... 4-5
TABLE OF CONTENTS
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4.2.10 Software Watchdog ................................................................................ 4-5
4.2.11 Periodic Interrupt Timer .......................................................................... 4-7
4.2.12 Low-Power Stop Operation .................................................................... 4-8
4.2.13 Freeze Operation ................................................................................... 4-9
4.3 System Clock ................................................................................................. 4-9
4.3.1 Clock Sources ...................................................................................... 4-10
4.3.2 Clock Synthesizer Operation ................................................................ 4-10
4.3.3 External Bus Clock ............................................................................... 4-15
4.3.4 Low-Power Operation ........................................................................... 4-15
4.3.5 Loss of Reference Signal ..................................................................... 4-16
4.4 External Bus Interface ..................................................................................4-17
4.4.1 Bus Signals .......................................................................................... 4-18
4.4.1.1 Address Bus ................................................................................. 4-18
4.4.1.2 Address Strobe ............................................................................ 4-18
4.4.1.3 Data Bus ...................................................................................... 4-18
4.4.1.4 Data Strobe ..................................................................................4-18
4.4.1.5 Read/Write Signal ........................................................................ 4-18
4.4.1.6 Size Signals ................................................................................. 4-19
4.4.1.7 Function Codes ............................................................................4-19
4.4.1.8 Data and Size Acknowledge Signals ........................................... 4-19
4.4.1.9 Bus Error Signal ...........................................................................4-20
4.4.1.10 Halt Signal .................................................................................... 4-20
4.4.1.11 Autovector Signal ......................................................................... 4-20
4.4.2 Dynamic Bus Sizing ............................................................................. 4-20
4.4.3 Operand Alignment .............................................................................. 4-21
4.4.4 Misaligned Operands ........................................................................... 4-22
4.4.5 Operand Transfer Cases ...................................................................... 4-22
4.5 Bus Operation .............................................................................................. 4-22
4.5.1 Synchronization to CLKOUT ................................................................ 4-23
4.5.2 Regular Bus Cycles .............................................................................. 4-23
4.5.2.1 Read Cycle ................................................................................... 4-24
4.5.2.2 Write Cycle ................................................................................... 4-25
4.5.3 Fast Termination Cycles ....................................................................... 4-26
4.5.4 CPU Space Cycles ............................................................................... 4-27
4.5.4.1 Breakpoint Acknowledge Cycle .................................................... 4-28
4.5.4.2 LPSTOP Broadcast Cycle ............................................................ 4-31
4.5.5 Bus Exception Control Cycles .............................................................. 4-31
4.5.5.1 Bus Errors .................................................................................... 4-33
4.5.5.2 Double Bus Faults ........................................................................ 4-33
4.5.5.3 Retry Operation ............................................................................ 4-34
4.5.5.4 Halt Operation .............................................................................. 4-34
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TABLE OF CONTENTS
4.5.6 External Bus Arbitration ........................................................................ 4-35
4.5.6.1 Slave (Factory Test) Mode Arbitration ......................................... 4-36
4.5.6.2 Show Cycles ................................................................................ 4-36
4.6 Reset ............................................................................................................ 4-37
4.6.1 Reset Exception Processing ................................................................ 4-37
4.6.2 Reset Control Logic .............................................................................. 4-38
4.6.3 Reset Mode Selection .......................................................................... 4-38
4.6.3.1 Data Bus Mode Selection ............................................................. 4-39
4.6.3.2 Clock Mode Selection .................................................................. 4-41
4.6.3.3 Breakpoint Mode Selection .......................................................... 4-41
4.6.4 MCU Module Pin Function During Reset ............................................. 4-41
4.6.5 Pin State During Reset ......................................................................... 4-42
4.6.5.1 Reset States of SIM Pins ............................................................. 4-42
4.6.5.2 Reset States of Pins Assigned to Other MCU Modules ............... 4-43
4.6.6 Reset Timing ........................................................................................ 4-43
4.6.7 Power-On Reset ................................................................................... 4-44
4.6.8 Reset Processing Summary ................................................................. 4-45
4.6.9 Reset Status Register .......................................................................... 4-46
4.7 Interrupts ...................................................................................................... 4-46
4.7.1 Interrupt Exception Processing ............................................................ 4-46
4.7.2 Interrupt Priority and Recognition ......................................................... 4-46
4.7.3 Interrupt Acknowledge and Arbitration ................................................. 4-47
4.7.4 Interrupt Processing Summary ............................................................. 4-48
4.7.5 Interrupt Acknowledge Bus Cycles ....................................................... 4-49
4.8 Chip Selects ................................................................................................. 4-49
4.8.1 Chip-Select Registers ........................................................................... 4-51
4.8.1.1 Chip-Select Pin Assignment Registers ........................................ 4-52
4.8.1.2 Chip-Select Base Address Registers ........................................... 4-53
4.8.1.3 Chip-Select Option Registers ....................................................... 4-53
4.8.1.4 PORTC Data Register .................................................................. 4-55
4.8.2 Chip-Select Operation .......................................................................... 4-55
4.8.3 Using Chip-Select Signals for Interrupt Acknowledge .......................... 4-55
4.8.4 Chip-Select Reset Operation ................................................................ 4-56
4.9 Parallel Input/Output Ports ........................................................................... 4-58
4.9.1 Pin Assignment Registers .................................................................... 4-58
4.9.2 Data Direction Registers ...................................................................... 4-58
4.9.3 Data Registers ...................................................................................... 4-58
4.10 Factory Test ................................................................................................. 4-58
SECTION 5 CENTRAL PROCESSING UNIT
5.1 General ........................................................................................................... 5-1
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TABLE OF CONTENTS
5.2 CPU32 Registers ............................................................................................ 5-2
5.2.1 Data Registers ........................................................................................ 5-3
5.2.2 Address Registers .................................................................................. 5-5
5.2.3 Program Counter .................................................................................... 5-5
5.2.4 Control Registers .................................................................................... 5-5
5.2.4.1 Status Register ............................................................................... 5-5
5.2.4.2 Alternate Function Code Registers ................................................ 5-6
5.2.5 Vector Base Register (VBR) ................................................................... 5-6
5.3 Memory Organization ..................................................................................... 5-6
5.4 Virtual Memory ............................................................................................... 5-8
5.5 Addressing Modes .......................................................................................... 5-8
5.6 Processing States .......................................................................................... 5-8
5.7 Privilege Levels .............................................................................................. 5-9
5.8 Instructions ..................................................................................................... 5-9
5.8.1 M68000 Family Compatibility ............................................................... 5-12
5.8.2 Special Control Instructions .................................................................. 5-13
5.8.2.1 Low Power Stop (LPSTOP) ......................................................... 5-13
5.8.2.2 Table Lookup and Interpolate (TBL) ............................................ 5-13
5.9 Exception Processing ................................................................................... 5-13
5.9.1 Exception Vectors ................................................................................ 5-13
5.9.2 Types of Exceptions ............................................................................. 5-14
5.9.3 Exception Processing Sequence .......................................................... 5-15
5.10 Development Support ................................................................................... 5-15
5.10.1 M68000 Family Development Support ................................................. 5-15
5.10.2 Background Debugging Mode .............................................................. 5-16
5.10.2.1 Enabling BDM .............................................................................. 5-17
5.10.2.2 BDM Sources ............................................................................... 5-17
5.10.2.3 Entering BDM ............................................................................... 5-18
5.10.2.4 BDM Commands .......................................................................... 5-19
5.10.2.5 Background Mode Registers ........................................................ 5-20
5.10.2.6 Returning from BDM .................................................................... 5-20
5.10.2.7 Serial Interface ............................................................................. 5-20
5.10.3 Recommended BDM Connection ......................................................... 5-22
5.10.4 Deterministic Opcode Tracking ............................................................ 5-22
5.10.5 On-Chip Breakpoint Hardware ............................................................. 5-23
5.11 Loop Mode Instruction Execution ................................................................. 5-23
SECTION 6QUEUED SERIAL MODULE
6.1 General ........................................................................................................... 6-1
6.2 QSM Registers and Address Map .................................................................. 6-2
6.2.1 QSM Global Registers ........................................................................... 6-2
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6.2.1.1 Low-Power Stop Operation ........................................................... 6-2
6.2.1.2 Freeze Operation .......................................................................... 6-3
6.2.1.3 QSM Interrupts .............................................................................. 6-3
6.2.2 QSM Pin Control Registers ................................................................... 6-3
6.3 Queued Serial Peripheral Interface ................................................................ 6-4
6.3.1 QSPI Registers ...................................................................................... 6-6
6.3.1.1 Control Registers ........................................................................... 6-7
6.3.1.2 Status Register .............................................................................. 6-7
6.3.2 QSPI RAM ............................................................................................. 6-7
6.3.2.1 Receive RAM ................................................................................. 6-7
6.3.2.2 Transmit RAM ................................................................................ 6-8
6.3.2.3 Command RAM ............................................................................. 6-8
6.3.3 QSPI Pins ............................................................................................... 6-8
6.3.4 QSPI Operation ...................................................................................... 6-9
6.3.5 QSPI Operating Modes ........................................................................ 6-10
6.3.5.1 Master Mode ................................................................................ 6-17
6.3.5.2 Master Wraparound Mode ........................................................... 6-20
6.3.5.3 Slave Mode .................................................................................. 6-20
6.3.5.4 Slave Wraparound Mode ............................................................. 6-22
6.3.6 Peripheral Chip Selects ........................................................................ 6-22
6.4 Serial Communication Interface ................................................................... 6-22
6.4.1 SCI Registers ....................................................................................... 6-22
6.4.1.1 Control Registers ......................................................................... 6-22
6.4.1.2 Status Register ............................................................................. 6-25
6.4.1.3 Data Register ............................................................................... 6-25
6.4.2 SCI Pins .............................................................................................. 6-25
6.4.3 SCI Operation ....................................................................................... 6-25
6.4.3.1 Definition of Terms ....................................................................... 6-25
6.4.3.2 Serial Formats .............................................................................. 6-26
6.4.3.3 Baud Clock ................................................................................... 6-26
6.4.3.4 Parity Checking ............................................................................ 6-27
6.4.3.5 Transmitter Operation .................................................................. 6-27
6.4.3.6 Receiver Operation ...................................................................... 6-28
6.4.3.7 Idle-Line Detection ....................................................................... 6-29
6.4.3.8 Receiver Wakeup ......................................................................... 6-30
6.4.3.9 Internal Loop ................................................................................ 6-30
6.5 QSM Initialization ......................................................................................... 6-31
SECTION 7TIME PROCESSOR UNIT
7.1 General ........................................................................................................... 7-1
7.2 TPU Components ........................................................................................... 7-2
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7.2.1 Time Bases ............................................................................................ 7-2
7.2.2 Timer Channels ...................................................................................... 7-2
7.2.3 Scheduler ............................................................................................... 7-2
7.2.4 Microengine ............................................................................................ 7-2
7.2.5 Host Interface ......................................................................................... 7-2
7.2.6 Parameter RAM ...................................................................................... 7-3
7.3 TPU Operation ............................................................................................... 7-3
7.3.1 Event Timing .......................................................................................... 7-3
7.3.2 Channel Orthogonality ............................................................................ 7-4
7.3.3 Interchannel Communication .................................................................. 7-4
7.3.4 Programmable Channel Service Priority ................................................ 7-4
7.3.5 Coherency .............................................................................................. 7-4
7.3.6 Emulation Support .................................................................................. 7-4
7.3.7 TPU Interrupts ........................................................................................ 7-5
7.4 Standard and Enhanced Standard Time Functions ....................................... 7-6
7.4.1 Discrete Input/Output (DIO) .................................................................... 7-6
7.4.2 Input Capture/Input Transition Counter (ITC) ......................................... 7-6
7.4.3 Output Compare (OC) ............................................................................ 7-6
7.4.4 Pulse-Width Modulation (PWM) ............................................................. 7-7
7.4.5 Synchronized Pulse-Width Modulation (SPWM) .................................... 7-7
7.4.6 Period Measurement with Additional Transition Detect (PMA) .............. 7-7
7.4.7 Period Measurement with Missing Transition Detect (PMM) ................. 7-7
7.4.8 Position-Synchronized Pulse Generator (PSP) ...................................... 7-7
7.4.9 Stepper Motor (SM) ................................................................................ 7-8
7.4.10 Period/Pulse-Width Accumulator (PPWA) .............................................. 7-8
7.4.11 Quadrature Decode (QDEC) .................................................................. 7-9
7.5 Motion Control Time Functions ...................................................................... 7-9
7.5.1 Table Stepper Motor (TSM) .................................................................... 7-9
7.5.2 New Input Capture/Transition Counter (NITC) ....................................... 7-9
7.5.3 Queued Output Match (QOM) .............................................................. 7-10
7.5.4 Programmable Time Accumulator (PTA) ............................................. 7-10
7.5.5 Multichannel Pulse-Width Modulation (MCPWM) ................................ 7-10
7.5.6 Fast Quadrature Decode (FQD) ........................................................... 7-10
7.5.7 Universal Asynchronous Receiver/Transmitter (UART) ....................... 7-11
7.5.8 Brushless Motor Commutation (COMM) .............................................. 7-11
7.5.9 Frequency Measurement (FQM) .......................................................... 7-11
7.5.10 Hall Effect Decode (HALLD) ................................................................. 7-11
7.6 Host Interface Registers ............................................................................... 7-11
7.6.1 System Configuration Registers ........................................................... 7-12
7.6.1.1 Prescaler Control for TCR1 .......................................................... 7-12
7.6.1.2 Prescaler Control for TCR2 .......................................................... 7-12
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7.6.1.3 Emulation Control ......................................................................... 7-13
7.6.1.4 Low-Power Stop Control .............................................................. 7-13
7.6.2 Channel Control Registers ................................................................... 7-14
7.6.2.1 Channel Interrupt Enable and Status Registers ........................... 7-14
7.6.2.2 Channel Function Select Registers .............................................. 7-14
7.6.2.3 Host Sequence Registers ............................................................ 7-14
7.6.2.4 Host Service Registers ................................................................. 7-14
7.6.2.5 Channel Priority Registers ........................................................... 7-14
7.6.3 Development Support and Test Registers ........................................... 7-15
SECTION 8STANDBY RAM WITH TPU EMULATION
8.1 General ........................................................................................................... 8-1
8.2 TPURAM Register Block ................................................................................ 8-1
8.3 TPURAM Array Address Mapping .................................................................. 8-1
8.4 TPURAM Privilege Level ................................................................................ 8-2
8.5 Normal Operation ........................................................................................... 8-2
8.6 Standby Operation ......................................................................................... 8-2
8.7 Low-Power Stop Operation ............................................................................ 8-3
8.8 Reset .............................................................................................................. 8-3
8.9 TPU Microcode Emulation .............................................................................. 8-3
APPENDIX A ELECTRICAL CHARACTERISTICS
APPENDIX B MECHANICAL DATA AND ORDERING INFORMATION
APPENDIX CDEVELOPMENT SUPPORT
C.1 M68MMDS1632 Modular Development System ........................................... C-1
C.2 M68MEVB1632 Modular Evaluation Board ................................................... C-2
APPENDIX D REGISTER SUMMARY
D.1 Central Processing Unit ................................................................................. D-1
D.1.1 CPU32 Register Model .......................................................................... D-2
D.1.2 SR — Status Register ........................................................................... D-3
D.2 System Integration Module ............................................................................ D-3
D.2.1 SIMCR — Module Configuration Register ............................. $YFFA00 D-5
D.2.2 SIMTR — System Integration Test Register .......................... $YFFA02 D-6
D.2.3 SYNCR — Clock Synthesizer Control Register .................... $YFFA04 D-6
D.2.4 RSR — Reset Status Register .............................................. $YFFA07 D-7
D.2.5 SIMTRE — System Integration Test Register (ECLK)........... $YFFA08 D-7
D.2.6 PORTE0/PORTE1 — Port E Data Register.......... $YFFA11, $YFFA13 D-8
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D.2.7 DDRE — Port E Data Direction Register ............................... $YFFA15 D-8
D.2.8 PEPAR — Port E Pin Assignment Register ........................... $YFFA17 D-8
D.2.9 PORTF0/PORTF1 — Port F Data Register...........$YFFA19, $YFFA1B D-9
D.2.10 DDRF — Port F Data Direction Register................................$YFFA1D D-9
D.2.11 PFPAR — Port F Pin Assignment Register............................ $YFFA1F D-9
D.2.12 SYPCR — System Protection Control Register ................... $YFFA21 D-10
D.2.13 PICR — Periodic Interrupt Control Register......................... $YFFA22 D-11
D.2.14 PITR — Periodic Interrupt Timer Register ........................... $YFFA24 D-11
D.2.15 SWSR — Software Service Register ................................... $YFFA27 D-11
D.2.16 TSTMSRA — Master Shift Register A.................................. $YFFA30 D-11
D.2.17 TSTMSRB — Master Shift Register B.................................. $YFFA32 D-11
D.2.18 TSTSC — Test Module Shift Count ..................................... $YFFA34 D-12
D.2.19 TSTRC — Test Module Repetition Count ............................ $YFFA36 D-12
D.2.20 CREG — Test Submodule Control Register ....................... $YFFA38 D-12
D.2.21 DREG — Distributed Register..............................................$YFFA3A D-12
D.2.22 PORTC — Port C Data Register.......................................... $YFFA41 D-12
D.2.23 CSPAR0 — Chip Select Pin Assignment Register 0............ $YFFA44 D-12
D.2.24 CSPAR1 — Chip Select Pin Assignment Register 1............ $YFFA46 D-13
D.2.25 CSBARBT — Chip Select Base Address Register Boot ROM $YFFA48 D-
13
D.2.26 CSBAR[0:10] — Chip Select Base Address Registers $YFFA4C–$YFFA74
D-13
D.2.27 CSORBT — Chip Select Option Register Boot ROM...........$YFFA4A D-14
D.2.28 CSOR[0:10] — Chip Select Option Registers .....$YFFA4E–$YFFA76 D-14
D.3 Standby RAM Module with TPU Emulation ................................................. D-16
D.3.1 TRAMMCR — TPURAM Module Configuration Register..... $YFFB00 D-16
D.3.2 TRAMTST — TPURAM Test Register ................................. $YFFB02 D-16
D.3.3 TRAMBAR — TPURAM Base Address and Status Register $YFFB04 D-16
D.4 Queued Serial Module ................................................................................. D-18
D.4.1 QSMCR — QSM Configuration Register ............................. $YFFC00 D-18
D.4.2 QTEST — QSM Test Register ............................................. $YFFC02 D-19
D.4.3 QILR — QSM Interrupt Level Register..........................................$YFFC04
QIVR — QSM Interrupt Vector Register$YFFC05 .................................................... D-19
D.4.4 SCCR0 — SCI Control Register 0 ....................................... $YFFC08 D-20
D.4.5 SCCR1 — SCI Control Register 1........................................$YFFC0A D-20
D.4.6 SCSR — SCI Status Register ............................................. $YFFC0C D-22
D.4.7 SCDR — SCI Data Register.................................................$YFFC0E D-23
D.4.8 PORTQS — Port QS Data Register..................................... $YFFC15 D-23
D.4.9 PQSPAR — PORT QS Pin Assignment Register .........................$YFFC16
DDRQS — PORT QS Data Direction Register$YFFC17 .......................................... D-23
D.4.10 SPCR0 — QSPI Control Register 0 ..................................... $YFFC18 D-25
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D.4.11 SPCR1 — QSPI Control Register 1 ....................................$YFFC1A D-26
D.4.12 SPCR2 — QSPI Control Register 2 ................................... $YFFC1C D-27
D.4.13 SPCR3 — QSPI Control Register 3 ............................................ $YFFC1E
SPSR — QSPI Status Register $YFFC1F ................................................................ D-27
D.4.14 RR[0:F] — Receive Data RAM........................... $YFFD00–$YFFD0E D-28
D.4.15 TR[0:F] — Transmit Data RAM ......................... $YFFD20–$YFFD3E D-28
D.4.16 CR[0:F] — Command RAM................................ $YFFD40–$YFFD4F D-29
D.5.1 TPUMCR — TPU Module Configuration Register................ $YFFE00 D-30
D.5.2 TCR — Test Configuration Register..................................... $YFFE02 D-32
D.5.3 DSCR — Development Support Control Register................ $YFFE04 D-32
D.5.4 DSSR — Development Support Status Register ................. $YFFE06 D-33
D.5.5 TICR — TPU Interrupt Configuration Register..................... $YFFE08 D-33
D.5.6 CIER — Channel Interrupt Enable Register.........................$YFFE0A D-34
D.5.7 CFSR0 — Channel Function Select Register 0 ...................$YFFE0C D-34
D.5.8 CFSR1 — Channel Function Select Register 1 ...................$YFFE0E D-34
D.5.9 CFSR2 — Channel Function Select Register 2 ................... $YFFE10 D-34
D.5.10 CFSR3 — Channel Function Select Register 3 ................... $YFFE12 D-34
D.5.11 HSQR0 — Host Sequence Register 0 ................................. $YFFE14 D-35
D.5.12 HSQR1 — Host Sequence Register 1 ................................. $YFFE16 D-35
D.5.13 HSRR0 — Host Service Request Register 0 ....................... $YFFE18 D-35
D.5.15 CPR0 — Channel Priority Register 0 ..................................$YFFE1C D-36
D.5.16 CPR1 — Channel Priority Register 1 .................................. $YFFE1E D-36
D.5.17 CISR — Channel Interrupt Status Register.......................... $YFFE20 D-36
D.5.18 LR — Link Register .............................................................. $YFFE22 D-36
D.5.19 SGLR — Service Grant Latch Register................................ $YFFE24 D-36
D.5.20 DCNR — Decoded Channel Number Register .................... $YFFE26 D-37
D.5.21 TPU Parameter RAM .......................................................................... D-37
SUMMARY OF CHANGES
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MC68332
USER’S MANUAL
(Continued)
Paragraph Title Page
TABLE OF CONTENTS
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MC68332
USER’S MANUAL
Figure Title Page
3-1 MCU Block Diagram ....................................................................................... 3-3
3-2 Pin Assignments for 132-Pin Package ........................................................... 3-4
3-3 Pin Assignments for 144-Pin Package ........................................................... 3-5
3-4 Internal Register Memory Map ..................................................................... 3-10
3-5 Overall Memory Map .................................................................................... 3-11
3-6 Separate Supervisor and User Space Map .................................................. 3-12
3-7 Supervisor Space (Separate Program/Data Space) Map ............................ 3-13
3-8 User Space (Separate Program/Data Space) Map ...................................... 3-14
4-1 System Integration Module Block Diagram .................................................... 4-2
4-2 System Configuration and Protection ............................................................. 4-3
4-3 Periodic Interrupt Timer and Software Watchdog Timer ................................ 4-7
4-4 System Clock Block Diagram ......................................................................... 4-9
4-5 System Clock Oscillator Circuit .................................................................... 4-10
4-6 System Clock Filter Networks ...................................................................... 4-11
4-7 MCU Basic System ...................................................................................... 4-17
4-8 Operand Byte Order ..................................................................................... 4-21
4-9 Word Read Cycle Flowchart ......................................................................... 4-25
4-10 Write Cycle Flowchart .................................................................................. 4-26
4-11 CPU Space Address Encoding .................................................................... 4-27
4-12 Breakpoint Operation Flowchart ................................................................... 4-30
4-13 LPSTOP Interrupt Mask Level ...................................................................... 4-31
4-14 Bus Arbitration Flowchart for Single Request ............................................... 4-36
4-15 Data Bus Mode Select Conditioning ............................................................. 4-40
4-16 Power-On Reset ........................................................................................... 4-45
4-17 Basic MCU System ...................................................................................... 4-50
4-18 Chip-Select Circuit Block Diagram ............................................................... 4-51
4-19 CPU Space Encoding for Interrupt Acknowledge ......................................... 4-56
5-1 CPU32 Block Diagram ................................................................................... 5-2
5-2 User Programming Model .............................................................................. 5-3
5-3 Supervisor Programming Model Supplement ................................................. 5-3
5-4 Data Organization in Data Registers .............................................................. 5-4
5-5 Address Organization in Address Registers ................................................... 5-5
5-6 Memory Operand Addressing ........................................................................ 5-7
5-7 Common in-Circuit Emulator Diagram .......................................................... 5-16
5-8 Bus State Analyzer Configuration ................................................................ 5-17
5-9 Debug Serial I/O Block Diagram .................................................................. 5-21
5-10 BDM Serial Data Word ................................................................................. 5-22
5-11 BDM Connector Pinout ................................................................................. 5-22
5-12 Loop Mode Instruction Sequence ................................................................. 5-23
6-1 QSM Block Diagram ....................................................................................... 6-1
6-2 QSPI Block Diagram ..................................................................................... 6-6
LIST OF ILLUSTRATIONS
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MC68332
USER’S MANUAL
(Continued)
Figure Title Page
LIST OF ILLUSTRATIONS
6-3 QSPI RAM ...................................................................................................... 6-8
6-4 Flowchart of QSPI Initialization Operation .................................................... 6-11
6-5 Flowchart of QSPI Master Operation (Part 1) .............................................. 6-12
6-5 Flowchart of QSPI Master Operation (Part 2) .............................................. 6-13
6-5 Flowchart of QSPI Master Operation (Part 3) .............................................. 6-14
6-6 Flowchart of QSPI Slave Operation (Part 1) ................................................ 6-15
6-6 Flowchart of QSPI Slave Operation (Part 2) ................................................ 6-16
6-7 SCI Transmitter Block Diagram .................................................................... 6-23
6-8 SCI Receiver Block Diagram ........................................................................ 6-24
7-1 TPU Block Diagram ........................................................................................ 7-1
7-2 TCR1 Prescaler Control ............................................................................... 7-12
7-3 TCR2 Prescaler Control ............................................................................... 7-13
A-1 CLKOUT Output Timing Diagram .................................................................A-14
A-2 External Clock Input Timing Diagram ...........................................................A-14
A-3 ECLK Output Timing Diagram ......................................................................A-14
A-4 Read Cycle Timing Diagram ........................................................................A-15
A-5 Write Cycle Timing Diagram .........................................................................A-16
A-6 Fast Termination Read Cycle Timing Diagram ............................................A-17
A-7 Fast Termination Write Cycle Timing Diagram .............................................A-18
A-8 Bus Arbitration Timing Diagram —Active Bus Case ....................................A-19
A-9 Bus Arbitration Timing Diagram — Idle Bus Case .......................................A-20
A-10 Show Cycle Timing Diagram ........................................................................A-20
A-11 Chip Select Timing Diagram .........................................................................A-21
A-12 Reset and Mode Select Timing Diagram ......................................................A-21
A-13 Background Debugging Mode Timing Diagram — Serial Communication ...A-23
A-14 Background Debugging Mode Timing Diagram — Freeze Assertion ...........A-23
A-15 ECLK Timing Diagram ..................................................................................A-25
A-16 QSPI Timing — Master, CPHA = 0 ..............................................................A-27
A-17 QSPI Timing — Master, CPHA = 1 ..............................................................A-27
A-18 QSPI Timing — Slave, CPHA = 0 ................................................................A-28
A-19 QSPI Timing — Slave, CPHA = 1 ................................................................A-28
A-20 TPU Timing Diagram ....................................................................................A-29
B-1 132-Pin Plastic Surface Mount Package Pin Assignments ............................B-2
B-2 144-Pin Plastic Surface Mount Package Pin Assignments ............................B-3
D-1 User Programming Model ..............................................................................D-2
D-2 Supervisor Programming Model Supplement .................................................D-2
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MC68332
USER’S MANUAL
Table Title Page
3-1 MCU Driver Types........................................................................................... 3-6
3-2 MCU Pin Characteristics ................................................................................. 3-6
3-3 MCU Power Connections ................................................................................ 3-7
3-4 MCU Signal Characteristics ............................................................................ 3-7
3-5 MCU Signal Function ...................................................................................... 3-8
3-6 SIM Reset Mode Selection............................................................................ 3-15
3-7 Module Pin Functions.................................................................................... 3-16
4-1 Show Cycle Enable Bits .................................................................................. 4-4
4-2 Bus Monitor Period.......................................................................................... 4-5
4-3 MODCLK Pin and SWP Bit During Reset ....................................................... 4-6
4-4 Software Watchdog Ratio................................................................................ 4-6
4-5 MODCLK Pin and PTP Bit at Reset ................................................................ 4-7
4-6 Periodic Interrupt Priority................................................................................. 4-8
4-7 Clock Control Multipliers................................................................................ 4-12
4-8 System Frequencies from 32.768–kHz Reference........................................ 4-14
4-9 Clock Control................................................................................................. 4-16
4-10 Size Signal Encoding .................................................................................... 4-19
4-11 Address Space Encoding .............................................................................. 4-19
4-12 Effect of DSACK Signals ............................................................................... 4-21
4-13 Operand Transfer Cases............................................................................... 4-22
4-14 DSACK, BERR, and HALT Assertion Results ............................................... 4-32
4-15 Reset Source Summary ................................................................................ 4-38
4-16 Reset Mode Selection ................................................................................... 4-39
4-17 Module Pin Functions.................................................................................... 4-42
4-18 SIM Pin Reset States .................................................................................... 4-43
4-19 Chip-Select Pin Functions ............................................................................. 4-52
4-20 Pin Assignment Field Encoding..................................................................... 4-52
4-21 Block Size Encoding...................................................................................... 4-53
4-22 Option Register Function Summary .............................................................. 4-54
4-23 Chip Select Base and Option Register Reset Values ................................... 4-57
4-24 CSBOOT Base and Option Register Reset Values....................................... 4-58
5-1 Instruction Set Summary ............................................................................... 5-10
5-2 Exception Vector Assignments...................................................................... 5-14
5-3 BDM Source Summary.................................................................................. 5-17
5-4 Polling the BDM Entry Source....................................................................... 5-18
5-5 Background Mode Command Summary ....................................................... 5-19
5-6 CPU Generated Message Encoding ............................................................. 5-22
6-1 QSM Pin Function ........................................................................................... 6-4
6-2 QSPI Pin Function........................................................................................... 6-9
6-3 BITS Encoding .............................................................................................. 6-19
6-4 SCI Pin Function ........................................................................................... 6-25
LIST OF TABLES
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MC68332
USER’S MANUAL
(Continued)
Table Title Page
LIST OF TABLES
6-5 Serial Frame Formats.................................................................................... 6-26
6-6 Effect of Parity Checking on Data Size ......................................................... 6-27
7-1 TCR1 Prescaler Control ................................................................................ 7-12
7-2 TCR2 Prescaler Control ................................................................................ 7-13
7-3 Channel Priority Encodings ........................................................................... 7-15
A-1 Maximum Ratings............................................................................................A-1
A-2 Typical Ratings, 16.78 MHz Operation............................................................A-2
A-2 a. Typical Ratings, 20.97 MHz Operation............................................................A-2
A-3 Thermal Characteristics ..................................................................................A-3
A-4 16.78 MHz Clock Control Timing.....................................................................A-4
A-4 a. 20.97 MHz Clock Control Timing.....................................................................A-5
A-5 16.78 MHz DC Characteristics ........................................................................A-6
A-5 a. 20.97 MHz DC Characteristics ........................................................................A-7
A-6 16.78 MHz AC Timing .....................................................................................A-9
A-6 a. 20.97 MHz AC Timing ...................................................................................A-11
A-7 Background Debugging Mode Timing ...........................................................A-22
A-8 16.78 MHz ECLK Bus Timing........................................................................A-24
A-8 a. 20.97 MHz ECLK Bus Timing........................................................................A-24
A-9 QSPI Timing ..................................................................................................A-26
A-10 16.78 MHz Time Processor Unit Timing........................................................A-29
A-11 20.97 MHz Time Processor Unit Timing........................................................A-29
B-1 MCU Ordering Information ..............................................................................B-5
B-2 Quantity Order Suffix.......................................................................................B-7
C-1 MC68332 Development Tools.........................................................................C-1
D-1 Module Address Map ......................................................................................D-1
D-2 SIM Address Map............................................................................................D-4
D-3 TPURAM Address Map .................................................................................D-16
D-4 QSM Address Map ........................................................................................D-18
D-5 TPU Address Map .........................................................................................D-30
D-6 Parameter RAM Address Map ......................................................................D-37
D-7 MC68332 Module Address Map....................................................................D-38
D-8 Register Bit and Field Mnemonics.................................................................D-41
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MC68332
INTRODUCTION
USER’S MANUAL 1-1
SECTION 1 INTRODUCTION
The MC68332, a highly-integrated 32-bit microcontroller, combines high-performance
data manipulation capabilities with powerful peripheral subsystems. The MCU is built
up from standard modules that interface through a common intermodule bus (IMB).
Standardization facilitates rapid development of devices tailored for specific applica-
tions.
The MCU incorporates a 32-bit CPU (CPU32), a system integration module (SIM), a
time processor unit (TPU), a queued serial module (QSM), and a 2-Kbyte static RAM
module with TPU emulation capability (TPURAM).
The MCU can either synthesize an internal clock signal from an external reference or
use an external clock input directly. Operation with a 32.768-kHz reference frequency
is standard. System hardware and software allow changes in clock rate during opera-
tion. Because MCU operation is fully static, register and memory contents are not af-
fected by clock rate changes.
High-density complementary metal-oxide semiconductor (HCMOS) architecture
makes the basic power consumption of the MCU low. Power consumption can be min-
imized by stopping the system clock. The CPU32 instruction set includes a low-power
stop (LPSTOP) command that efficiently implements this capability.
Documentation for the Modular Microcontroller Family follows the modular construc-
tion of the devices in the product line. Each microcontroller has a comprehensive us-
er's manual that provides sufficient information for normal operation of the device. The
user's manual is supplemented by module reference manuals that provide detailed in-
formation about module operation and applications. Refer to Freescale publication
Ad-
vanced Microcontroller Unit (AMCU) Literature
(BR1116/D) for a complete listing of
documentation.
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INTRODUCTION
MC68332
1-2 USER’S MANUAL
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MC68332
NOMENCLATURE
USER’S MANUAL 2-1
SECTION 2 NOMENCLATURE
The following nomenclature is used throughout the manual. Nomenclature used only
in certain sections, such as register bit mnemonics, is defined in those sections.
2.1 Symbols and Operators
+ — Addition
- — Subtraction or negation (two's complement)
* — Multiplication
/ — Division
> — Greater
< — Less
= — Equal
≥
— Equal or greater
≤
— Equal or less
- — Not equal
•
— AND
; — Inclusive OR (OR)
⊕
— Exclusive OR (EOR)
NOT — Complementation
: — Concatenation
⇒
— Transferred
⇔
— Exchanged
±
— Sign bit; also used to show tolerance
« — Sign extension
% — Binary value
$ — Hexadecimal value
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NOMENCLATURE
MC68332
2-2 USER’S MANUAL
2.2 CPU32 Registers
A6–A0 — Address registers (Index registers)
A7 (SSP) — Supervisor Stack Pointer
A7 (USP) — User Stack Pointer
CCR — Condition code register (user portion of SR)
D7–D0 — Data Registers (Index registers)
DFC — Alternate function code register
PC — Program counter
SFC — Alternate function code register
SR — Status register
VBR — Vector base register
X — Extend indicator
N — Negative indicator
Z — Zero indicator
V — Two's complement overflow indicator
C — Carry/borrow indicator
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MC68332
NOMENCLATURE
USER’S MANUAL 2-3
2.3 Pin and Signal Mnemonics
ADDR[23:0] — Address Bus
AS — Address Strobe
AVEC — Autovector
BERR — Bus Error
BG — Bus Grant
BGACK — Bus Grant Acknowledge
BKPT — Breakpoint
BR — Bus Request
CLKOUT — System Clock
CS[10:0] — Chip Selects
CSBOOT — Boot ROM Chip Select
DATA[15:0] — Data Bus
DS — Data Strobe
DSACK[1:0] — Data and Size Acknowledge
DSCLK — Development Serial Clock
DSI — Development Serial Input
DSO — Development Serial Output
EXTAL — External Crystal Oscillator Connection
FC[2:0] — Function Codes
FREEZE — Freeze
HALT — Halt
IFETCH — Instruction Fetch
IPIPE — Instruction Pipeline
IRQ[7:1] — Interrupt Request
MISO — Master In Slave Out
MODCLK — Clock Mode Select
MOSI — Master Out Slave In
PC[6:0] — SIM I/O Port C
PCS[3:0] — Peripheral Chip Selects
PE[7:0] — SIM I/O Port E
PF[7:0] — SIM I/O Port F
PQS[7:0] — QSM I/O Port
QUOT — Quotient Out
R/W — Read/Write
RESET — Reset
RMC — Read-Modify-Write Cycle
RXD — SCI Receive Data
SCK — QSPI Serial Clock
SIZ[1:0] — Size
SS — Slave Select
T2CLK — TPU Clock In
TPUCH[15:0] — TPU Channel Signals
TSC — Three-State Control
TXD — SCI Transmit Data
XFC — External Filter Capacitor
XTAL — External Crystal Oscillator Connection
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NOMENCLATURE
MC68332
2-4 USER’S MANUAL
2.4 Register Mnemonics
CFSR[0:3] — Channel Function Select Registers [0:3]
CIER — Channel Interrupt Enable Register
CISR — Channel Interrupt Status Register
CPR[0:1] — Channel Priority Registers [0:1]
CREG — Test Control Register C
CR[0:F] — QSM Command RAM
CSBARBT — Chip-Select Base Address Register Boot ROM
CSBAR[0:10] — Chip-Select Base Address Registers [0:10]
CSORBT — Chip-Select Option Register Boot ROM
CSOR[0:10] — Chip-Select Option Registers [0:10]
CSPAR[0:1] — Chip-Select Pin Assignment Registers [0:1]
DCNR — Decoded Channel Number Register
DDRE — Port E Data Direction Register
DDRF — Port F Data Direction Register
DDRQS — Port QS Data Direction Register
DREG — SIM Test Module Distributed Register
DSCR — Development Support Control Register
DSSR — Development Support Status Register
HSQR[0:1] — Host Sequence Registers [0:1]
HSRR[0:1] — Host Service Request Registers [0:1]
LR — Link Register
PEPAR — Port E Pin Assignment Register
PFPAR — Port F Pin Assignment Register
PICR — Periodic Interrupt Control Register
PITR — Periodic Interrupt Timer Register
PORTC — Port C Data Register
PORTE — Port E Data Register
PORTF — Port F Data Register
PORTQS — Port QS Data Register
PQSPAR — Port QS Pin Assignment Register
QILR — QSM Interrupt Level Register
QIVR — QSM Interrupt Vector Register
QSMCR — QSM Configuration Register
QTEST — QSM Test Register
RR[0:F] — QSM Receive Data RAM
RSR — Reset Status Register
SCCR[0:1] — SCI Control Registers [0:1]
SCDR — SCI Data Register
SCSR — SCI Status Register
SGLR — Service Grant Latch Register
SIMCR — SIM Module Configuration Register
SIMTR — System Integration Test Register
SIMTRE — System Integration Test Register (ECLK)
SPCR[0:3] — QSPI Control Registers [0:3]
SPSR — QSPI Status Register
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MC68332
NOMENCLATURE
USER’S MANUAL 2-5
2.5 Conventions
Logic level one
is the voltage that corresponds to a Boolean true (1) state.
Logic level zero
is the voltage that corresponds to a Boolean false (0) state.
Set
refers specifically to establishing logic level one on a bit or bits.
Clear
refers specifically to establishing logic level zero on a bit or bits.
Asserted
means that a signal is in active logic state. An active low signal changes
from logic level one to logic level zero when asserted, and an active high signal chang-
es from logic level zero to logic level one.
Negated
means that an asserted signal changes logic state. An active low signal
changes from logic level zero to logic level one when negated, and an active high sig-
nal changes from logic level one to logic level zero.
A specific mnemonic
within a range is referred to by mnemonic and number. A15 is
bit 15 of accumulator A; ADDR7 is line 7 of the address bus; CSOR0 is chip-select op-
tion register 0.
A range of mnemonics
is referred to by mnemonic and the numbers
that define the range. AM[35:30] are bits 35 to 30 of accumulator M; CSOR[0:5] are
the first six option registers
Parentheses
are used to indicate the content of a register or memory location, rather
than the register or memory location itself. (A) is the content of accumulator A. (M
:
M
+
1) is the content of the word at address M.
LSB
means least significant bit or bits.
MSB
means most significant bit or bits. Refer-
ences to low and high bytes are spelled out.
LSW
means least significant word or words.
MSW
means most significant word or
words.
ADDR
is the address bus. ADDR[7:0] are the eight LSB of the address bus.
DATA
is the data bus. DATA[15:8] are the eight MSB of the data bus.
SWSR — Software Watchdog Service Register
SYNCR — Clock Synthesizer Control Register
SYPCR — System Protection Control Register
TCR — TPU Test Configuration Register
TICR — TPU Interrupt Configuration Register
TPUMCR — TPU Module Configuration Register
TRAMBAR — TPURAM Base Address/Status Register
TRAMMCR — TPURAM Module Configuration Register
TRAMTST — TPURAM Test Register
TR[0:F] — QSM Transmit Data RAM
TSTMSRA — Test Module Master Shift Register A
TSTMSRB — Test Module Master Shift Register B
TSTRC — Test Module Repetition Counter
TSTSC — Test Module Shift Count Register
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NOMENCLATURE
MC68332
2-6 USER’S MANUAL
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MC68332
OVERVIEW
USER’S MANUAL 3-1
SECTION 3 OVERVIEW
This section contains information about the entire modular microcontroller. It lists the
features of each module, shows device functional divisions and pin assignments, sum-
marizes signal and pin functions, discusses the intermodule bus, and provides system
memory maps. Timing and electrical specifications for the entire microcontroller and
for individual modules are provided in
APPENDIX A ELECTRICAL CHARACTERIS-
TICS
. Comprehensive module register descriptions and memory maps are provided
in
APPENDIX D REGISTER SUMMARY
.
3.1 MC68332 Features
The following paragraphs highlight capabilities of each of the microcontroller modules.
Each module is discussed separately in a subsequent section of this user's manual.
3.1.1 System Integration Module (SIM)
• External Bus Support
• Programmable Chip-Select Outputs
• System Protection Logic
• Watchdog Timer, Clock Monitor, and Bus Monitor
• System Protection Logic
• System Clock Based on 32.768-kHz Crystal for Low Power Operation
• Test/Debug Submodule for Factory/User Test and Development
3.1.2 Central Processing Unit (CPU)
• Upward Object Code Compatible
• New Instructions for Controller Applications
• 32-Bit Architecture
• Virtual Memory Implementation
• Loop Mode of Instruction Execution
• Table Lookup and Interpolate Instruction
• Improved Exception Handling for Controller Applications
• Trace on Change of Flow
• Hardware Breakpoint Signal, Background Mode
• Fully Static Operation
3.1.3 Time Processor Unit (TPU)
• Dedicated Microengine Operating Independently of CPU32
• 16 Independent, Programmable Channels and Pins
• Any Channel can Perform any Time Function
• Two Timer Count Registers with Programmable Prescalers
• Selectable Channel Priority Levels
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OVERVIEW MC68332
3-2 USER’S MANUAL
3.1.4 Queued Serial Module (QSM)
• Enhanced Serial Communication Interface (SCI), Universal Asynchronous Re-
ceiver Transmitter (UART): Modulus Baud Rate, Parity
• Queued Serial Peripheral Interface (SPI): 80-Byte RAM, Up to 16 Automatic
Transfers
• Dual Function I/O Ports
• Continuous Cycling, 8–16 Bits per Transfer
3.1.5 Static RAM Module with TPU Emulation Capability (TPURAM)
• 2-Kbytes of Static RAM
• May be Used as Normal RAM or TPU Microcode Emulation RAM
3.2 System Block Diagram and Pin Assignment Diagrams
Figure 3-1 is a functional diagram of the MCU. Although diagram blocks represent the
relative size of the physical modules, there is not a one-to-one correspondence be-
tween location and size of blocks in the diagram and location and size of integrated-
circuit modules. Figure 3-2 shows the pin assignments of the 132-pin plastic surface-
mount package. Figure 3-3 shows the pin assignments of the 144-pin plastic surface-
mount package. Refer to APPENDIX B MECHANICAL DATA AND ORDERING IN-
FORMATION for package dimensions. All pin functions and signal names are shown
in this drawing. Refer to subsequent paragraphs in this section for pin and signal de-
scriptions.
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MC68332 OVERVIEW
USER’S MANUAL 3-3
Figure 3-1 MCU Block Diagram
332 BLOCK
PQS5/PCS2
PQS7/TXD
PQS4/PCS1
PQS6/PCS3
CPU 32
QSM
IMB
TPU
PQS0/MISO
PQS1/MOSI
PQS2/SCK
PORT QS
TXD
PCS2
SCK
MISO
MOSI
CONTROL
PCS1
PQS3/PCS0/SS PCS0/SS
RXD
PCS3
BKPT/DSCLK
IFETCH/DSI
IPIPE/DSO
DSI
DSO
IPIPE
IFETCH
BKPT
IRQ[7:1]
ADDR[23:0]
CONTROL
PORT F PORT C
FC2
FC1
FC0
BG
BR
BGACK
MODCLK
ADDR[23:19]
CLOCK
EBI
CS[10:0]
BR/CS0
BG/CS1
BGACK/CS2
R/W
RESET
HALT
BERR
CLKOUT
XTAL
EXTAL
CHIP
SELECTS CSBOOT
ADDR[18:0]
DATA[15:0]DATA[15:0]
QUOT
TEST
FREEZE/QUOT
TSC
CONTROL
TSC
PC0/FC0/CS3
PC1/FC1/CS4
PC2/FC2/CS5
PC3/ADDR19/CS6
PC4/ADDR20/CS7
PC5/ADDR21/CS8
PC6/ADDR22/CS9
ADDR23/CS10
PF7/IRQ7
PF6/IRQ6
PF5/IRQ5
PF4/IRQ4
PF3/IRQ3
PF2/IRQ2
PF1/IRQ1
PF0/MODCLK
CONTROL
PORT E
SIZ1 PE7/SIZ1
SIZ0 PE6/SIZ0
DSACK0 PE0/DSACK0
DSACK1 PE1/DSACK1
AVEC PE2/AVEC
PE3/RMC
DS PE5/DS
RMC PE4/AS
T2CLK T2CLK
TPUCH[15:0] TPUCH[15:0]
XFC
VDDSYN
2 KBYTES
RAM
VSTBY
CONTROL
AS
CONTROL
DSCLK
FREEZE
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OVERVIEW MC68332
3-4 USER’S MANUAL
Figure 3-2 Pin Assignments for 132-Pin Package
332 132-PIN QFP
MC68332
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
116
115
114
113
112
111
110
109
108
107
106
105
104
103
102
101
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
84
DATA9
DATA10
DATA11
DATA12
DATA13
DATA14
DATA15
ADDR0
ADDR1
ADDR2
ADDR3
ADDR4
ADDR5
ADDR6
ADDR7
ADDR8
ADDR9
ADDR10
ADDR11
ADDR12
ADDR13
ADDR14
ADDR15
ADDR16
ADDR17
ADDR18
PQS0/MISO
PQS1/MOSI
PQS2/SCK
PQS3/PCS0/SS
PQS4/PCS1
PQS5/PCS2
PQS6/PCS3
DATA0
DATA1
DATA2
DATA3
DATA4
DATA5
DATA6
DATA7
DATA8
VDD
VSS
VDD
PE1/DSACK1
PE0/DSACK0
PE2/AVEC
PE3/RMC
PE5/DS
CSBOOT
BGACK/CS2
BG/CS1
BR/CS0
VSTBY
51 17
117
16
15
14
13
12
11
10
9
8
7
6
5
4
3
131
130
129
128
127
126
125
124
123
122
121
120
119
118
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
PQS7/TXD
RXD
IPIPE/DSO
FREEZE/QUOT
XTAL
EXTAL
XFC
CLKOUT
PF0/MODCLK
PE7/SIZ1
PE6/SIZ0
TPUCH0
TPUCH1
TPUCH2
TPUCH3
TPUCH4
TPUCH5
TPUCH6
TPUCH7
TPUCH8
TPUCH9
TPUCH10
TPUCH11
TPUCH13
TPUCH14
TPUCH15
T2CLK
TPUCH12
VSS
VDD
VSS
PC0/FC0/CS3
PC1/FC1/CS4
PC2/FC2/CS5
PC3/ADDR19/CS6
PC4/ADDR20/CS7
PC5/ADDR21/CS8
PC6/ADDR22/CS9
ADDR23/CS10
AS
R/W
PF1/IRQ1
PF2/IRQ2
PF3/IRQ3
PF4/IRQ4
PF5/IRQ5
PF6/IRQ6
PF7/IRQ7
BERR
HALT
RESET
TSC
BKPT/DSCLK
IFETCH/DSI
2
1
132
VDDSYN
VSS
VSS
VDD
VSS
VDD
VSS
VDD
VSS
VSS
VDD
VDD
VSS
VDD
VDD
VSS
VSS
VDD
VSS
VSS
VSS
VDD
VDD
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MC68332 OVERVIEW
USER’S MANUAL 3-5
Figure 3-3 Pin Assignments for 144-Pin Package
3.3 Pin Descriptions
The following tables summarize functional characteristics of MCU pins. Table 3-1
shows types of output drivers. Table 3-2 shows all inputs and outputs. Digital inputs
and outputs use CMOS logic levels. An entry in the Discrete I/O column indicates that
a pin can also be used for general-purpose input, output, or both. The I/O port desig-
nation is given when it applies. Table 3-3 shows characteristics of power pins. Refer
to Figure 3-1 for port organization.
332 144-PIN QFP
VSS
NC
FC0/CS3
FC1/CS4
FC2/CS5
ADDR19/CS6
ADDR20/CS7
ADDR21/CS8
ADDR22/CS9
ADDR23/CS10
VDD
T2CLK
TPUCH15
TPUCH14
TPUCH13
TPUCH12
NC
TPUCH11
TPUCH10
TPUCH9
TPUCH8
VDDE
VSSE
TPUCH7
TPUCH6
TPUCH5
TPUCH4
MC68332
NC
PE4/AS
PE6/SIZ0
PE7/SIZ1
R/W
PF0/MODCLK
PF1/IRQ1
PF2/IRQ2
PF3/IRQ3
PF4/IRQ4
PF5/IRQ5
PF6/IRQ6
PF7/IRQ7
BERR
HALT
RESET
CLKOUT
NC
XFC
EXTAL
VDD
XTAL
FREEZE/QUOT
TSC
BKPT/DSCLK
IFETCH/DSI
IPIPE/DSO
RXD
PQS7/TXD
VSS
NC
TPUCH3
TPUCH2
TPUCH1
TPUCH0
NC
2
1
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
107
108
106
105
104
103
102
101
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
84
83
82
81
80
79
78
77
76
75
74
73
31
32
33
34
35
36
BGACK/CS2
BG/CS1
BR/CS0
CSBOOT
DATA0
DATA1
DATA2
DATA3
DATA4
DATA5
DATA6
DATA7
NC
DATA8
NC
DATA9
DATA10
NC
DATA11
VSS
DATA12
DATA13
DATA14
DATA15
ADDR0
PE0/DSACK0
PE1/DSACK1
PE2/AVEC
PE3/RMC
PE5/DS
VDD
VSTBY
ADDR1
ADDR2
ADDR3
ADDR4
ADDR5
ADDR6
ADDR7
ADDR8
VDD
VSS
ADDR9
ADDR10
ADDR11
ADDR12
NC
NC
ADDR13
ADDR14
ADDR15
NC
ADDR16
ADDR17
ADDR18
PQS0/MISO
PQS1/MOSI
PQS2/SCK
PQS3/PCS0/SS
PQS4/PCS1
PQS5/PCS2
PQS6/PCS3
143
144
142
141
140
139
138
137
136
135
134
133
132
131
130
129
128
127
126
125
124
123
122
121
120
119
118
117
116
115
114
113
112
111
110
109
37
65
68
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
66
67
69
70
71
72
VSS
VDD
VSS
VDD
VSS
VDD
VDD
VSS
VSS
VDD
VSS
VSS
VDD
VDD
VSS
VDD
VSS
VSS
VDD
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OVERVIEW MC68332
3-6 USER’S MANUAL
Table 3-1 MCU Driver Types
Type I/O Description
A O Output-only signals that are always driven; no external pull-up required
Aw O Type A output with weak P-channel pull-up during reset
B O Three-state output that includes circuitry to pull up output before high impedance is
established, to ensure rapid rise time. An external holding resistor is required to
maintain logic level while the pin is in the high-impedance state.
Bo O Type B output that can be operated in an open-drain mode
Table 3-2 MCU Pin Characteristics
Pin
Mnemonic Output
Driver Input
Synchronized Input
Hysteresis Discrete
I/O Port
Designation
ADDR23/CS10/ECLK A Y N O —
ADDR[22:19]/CS[9:6] A Y N O PC[6:3]
ADDR[18:0] A Y N — —
AS B Y N I/O PE5
AVEC B Y N I/O PE2
BERR B Y N — —
BG/CS1 B — — — —
BGACK/CS2 B Y N — —
BKPT/DSCLK — Y Y — —
BR/CS0 B Y N — —
CLKOUT A — — — —
CSBOOT B — — — —
DATA[15:0]1Aw Y N — —
DS B Y N I/O PE4
DSACK1 B Y N I/O PE1
DSACK0 B Y N I/O PE0
DSI/IFETCH A Y Y — —
DSO/IPIPE A — — — —
EXTAL2 — — Special — —
FC[2:0]/CS[5:3] A Y N O PC[2:0]
FREEZE/QUOT A — — — —
HALT Bo Y N — —
IRQ[7:1] B Y Y I/O PF[7:1]
MISO Bo Y Y I/O PQS0
MODCLK1B Y N I/O PF0
MOSI Bo Y Y I/O PQS1
PCS0/SS Bo Y Y I/O PQS3
PCS[3:1] Bo Y Y I/O PQS[6:4]
R/W A Y N — —
RESET Bo Y Y — —
RMC B Y N I/O PE3
RXD — N N — —
SCK Bo Y Y I/O PQS2
SIZ[1:0] B Y N I/O PE[7:6]
T2CLK — Y Y — —
TPUCH[15:0] A Y Y — —
TSC — Y Y — —
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MC68332 OVERVIEW
USER’S MANUAL 3-7
3.4 Signal Descriptions
The following tables define MCU signals. Table 3-4 shows signal origin, type, and ac-
tive state. Table 3-5 describes signal functions. Both tables are sorted alphabetically
by mnemonic. MCU pins often have multiple functions. More than one description can
apply to a pin.
NOTES:
1. DATA[15:0] are synchronized during reset only. MODCLK is synchronized only when used as an input port pin.
2. EXTAL, XFC, and XTAL are clock reference connections.
TXD Bo Y Y I/O PQS7
XFC2 — — — Special —
XTAL2 — — — Special —
Table 3-3 MCU Power Connections
Pin Mnemonic Description
VSTBY Standby RAM Power
VDDSYN Clock Synthesizer Power
VSSE/VDDE External Periphery Power (Source and Drain)
VSSI/VDDI Internal Module Power (Source and Drain)
Table 3-4 MCU Signal Characteristics
Signal
Name MCU
Module Signal
Type Active
State
ADDR[23:0] SIM Bus —
AS SIM Output 0
AVEC SIM Input 0
BERR SIM Input 0
BG SIM Output 0
BGACK SIM Input 0
BKPT CPU32 Input 0
BR SIM Input 0
CLKOUT SIM Output —
CS[10:0] SIM Output 0
CSBOOT SIM Output 0
DATA[15:0] SIM Bus —
DS SIM Output 0
DSACK[1:0] SIM Input 0
DSCLK CPU32 Input Serial Clock
DSI CPU32 Input (Serial Data)
DSO CPU32 Output (Serial Data)
EXTAL SIM Input —
FC[2:0] SIM Output —
FREEZE SIM Output 1
HALT SIM Input/Output 0
Table 3-2 MCU Pin Characteristics (Continued)
Pin
Mnemonic Output
Driver Input
Synchronized Input
Hysteresis Discrete
I/O Port
Designation
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OVERVIEW MC68332
3-8 USER’S MANUAL
IFETCH CPU32 Output —
IPIPE CPU32 Output —
IRQ[7:1] SIM Input 0
MISO QSM Input/Output —
MODCLK SIM Input —
MOSI QSM Input/Output —
PC[6:0] SIM Output (Port)
PCS[3:0] QSM Input/Output —
PE[7:0] SIM Input/Output (Port)
PF[7:0] SIM Input/Output (Port)
PQS[7:0] QSM Input/Output (Port)
QUOT SIM Output —
RESET SIM Input/Output 0
RMC SIM Output 0
R/W SIM Output 1/0
RXD QSM Input —
SCK QSM Input/Output —
SIZ[1:0] SIM Output —
SS QSM Input 0
T2CLK TPU Input —
TPUCH[15:0] TPU Input/Output 1
TSC SIM Input —
TXD QSM Output —
XFC SIM Input —
XTAL SIM Output —
Table 3-5 MCU Signal Function
Signal Name Mnemonic Function
Address Bus ADDR[23:0] 24-bit address bus
Address Strobe AS Indicates that a valid address is on the address bus
Autovector AVEC Requests an automatic vector during interrupt acknowledge
Bus Error BERR Indicates that a bus error has occurred
Bus Grant BG Indicates that the MCU has relinquished the bus
Bus Grant Acknowledge BGACK Indicates that an external device has assumed bus mastership
Breakpoint BKPT Signals a hardware breakpoint to the CPU
Bus Request BR Indicates that an external device requires bus mastership
System Clockout CLKOUT System clock output
Chip Selects CS[10:0] Select external devices at programmed addresses
Boot Chip Select CSBOOT Chip select for external boot start-up ROM
Data Bus DATA[15:0] 16-bit data bus
Data Strobe DS During a read cycle, indicates when it is possible for an external
device to place data on the data bus. During a write cycle,
indicates that valid data is on the data bus.
Data and Size Acknowledge DSACK[1:0] Provide asynchronous data transfers and dynamic bus sizing
Development Serial In, Out,
Clock
DSI, DSO,
DSCLK
Serial I/O and clock for background debugging mode
Crystal Oscillator EXTAL, XTAL Connections for clock synthesizer circuit reference;
a crystal or an external oscillator can be used
Table 3-4 MCU Signal Characteristics (Continued)
Signal
Name MCU
Module Signal
Type Active
State
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MC68332 OVERVIEW
USER’S MANUAL 3-9
3.5 Intermodule Bus
The intermodule bus (IMB) is a standardized bus developed to facilitate both design
and operation of modular microcontrollers. It contains circuitry to support exception
processing, address space partitioning, multiple interrupt levels, and vectored inter-
rupts. The standardized modules in the MCU communicate with one another and with
external components through the IMB. The IMB in the MCU uses 24 address and 16
data lines.
3.6 System Memory Map
Figure 3-4 through Figure 3-8 are MCU memory maps. Figure 3-4 shows IMB ad-
dresses of internal registers. Figure 3-5 through Figure 3-8 show system memory
maps that use different external decoding schemes.
Function Codes FC[2:0] Identify processor state and current address space
Freeze FREEZE Indicates that the CPU has entered background mode
Halt HALT Suspend external bus activity
Instruction Pipeline IPIPE, IFETCH Indicate instruction pipeline activity
Interrupt Request Level IRQ[7:1] Provides an interrupt priority level to the CPU
Master In Slave Out MISO Serial input to QSPI in master mode;
serial output from QSPI in slave mode
Clock Mode Select MODCLK Selects the source and type of system clock
Master Out Slave In MOSI Serial output from QSPI in master mode;
serial input to QSPI in slave mode
Port C PC[6:0] SIM digital output port signals
Auxiliary Timer Clock Input PCLK External clock dedicated to the GPT
Peripheral Chip Select PCS[3:0] QSPI peripheral chip selects
Port E PE[7:0] SIM digital I/O port signals
Port F PF[7:0] SIM digital I/O port signals
Port QS PQS[7:0] QSM digital I/O port signals
Quotient Out QUOT Provides the quotient bit of the polynomial divider
Reset RESET System reset
Read-Modify-Write Cycle RMC Indicates an indivisible read-modify-write instruction
Read/Write R/W Indicates the direction of data transfer on the bus
SCI Receive Data RXD Serial input to the SCI
QSPI Serial Clock SCK Clock output from QSPI in master mode;
clock input to QSPI in slave mode
Size SIZ[1:0] Indicates the number of bytes to be transferred during a bus cycle
Slave Select SS Causes serial transmission when QSPI is in slave mode;
causes mode fault in master mode
TCR2 Clock T2CLK External clock source for TCR2 counter
TPU Channel Pins TPUCH[15:0] Bidirectional pins associated with TPU channels
Three-State Control TSC Places all output drivers in a high-impedance state
SCI Transmit Data TXD Serial output from the SCI
External Filter Capacitor XFC Connection for external phase-locked loop filter capacitor
Table 3-5 MCU Signal Function (Continued)
Signal Name Mnemonic Function
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OVERVIEW MC68332
3-10 USER’S MANUAL
3.6.1 Internal Register Map
In Figure 3-4, IMB ADDR[23:20] are represented by the letter Y. The value represent-
ed by Y determines the base address of MCU module control registers. In M68300 mi-
crocontrollers, Y is equal to M111, where M is the logic state of the module mapping
(MM) bit in the system integration module configuration register (SIMCR).
Figure 3-4 Internal Register Memory Map
3.6.2 Address Space Maps
Figure 3-5 shows a single memory space. Function codes FC[2:0] are not decoded
externally so that separate user/supervisor or program/data spaces are not provided.
In Figure 3-6, FC2 is decoded, resulting in separate supervisor and user spaces.
FC[1:0] are not decoded, so that separate program and data spaces are not provided.
In Figure 3-7 and Figure 3-8, FC[2:0] are decoded, resulting in four separate memory
spaces: supervisor/program, supervisor/data, user/program and user/data.
All exception vectors are located in supervisor data space, except the reset vector,
which is located in supervisor program space. Only the initial reset vector is fixed in
the processor's memory map. Once initialization is complete, there are no fixed as-
signments. Since the vector base register (VBR) provides the base address of the vec-
tor table, the vector table can be located anywhere in memory. Refer to SECTION 5
CENTRAL PROCESSING UNIT for more information concerning memory manage-
ment, extended addressing, and exception processing. Refer to SECTION 4 SYSTEM
INTEGRATION MODULE for more information concerning function codes and ad-
dress space types.
332 ADDRESS MAP
SIM
RESERVED
QSM
$YFFC00
$YFFB40
$YFF000
2-KBYTE
TPURAM ARRAY
$YFFA00
TPURAM CONTROL
$YFFB00
RESERVED
$YFFA80
TPU
$YFFFFF
$YFFE00
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MC68332 OVERVIEW
USER’S MANUAL 3-11
Figure 3-5 Overall Memory Map
332 S/U COMB MAP
INTERNAL REGISTERS (MM = 1)
$000000
$FFFFFF
$FF0000
COMBINED
SUPERVISOR
AND USER
SPACE
$7FF000 INTERNAL REGISTERS (MM = 0)
NOTES:
1. Location of the exception vector table is determined by the vector base register. The vector address is the sum of the vector
base register and the vector offset.
2. Location of the module control registers is determined by the state of the module mapping (MM) bit in the SIM configure register.
Y = M111, where M is the state of the MM bit.
3. Unused addresses within the internal register block are mapped externally. "RESERVED" blocks are not mapped externally.
$XX03FC
$XX0000RESET — INITIAL STACK POINTER
RESET — INITIAL PC
BUS ERROR
ADDRESS ERROR
ILLEGAL INSTRUCTION
ZERO DIVISION
CHK, CHK2 INSTRUCTIONS
TRAPcc, TRAPV INSTRUCTIONS
PRIVILEGE VIOLATION
TRACE
LINE 1010 EMULATOR
LINE 1111 EMULATOR
HARDWARE BREAKPOINT
(RESERVED COPROCESSOR PROTOCOL VIOLATION)
FORMAT ERROR AND UNINITIALIZED INTERRUPT
FORMAT ERROR AND UNINITIALIZED INTERRUPT
(UNASSIGNED, RESERVED)
SPURIOUS INTERRUPT
LEVEL 1 INTERRUPT AUTOVECTOR
LEVEL 2 INTERRUPT AUTOVECTOR
LEVEL 3 INTERRUPT AUTOVECTOR
LEVEL 4 INTERRUPT AUTOVECTOR
LEVEL 5 INTERRUPT AUTOVECTOR
LEVEL 6 INTERRUPT AUTOVECTOR
LEVEL 7 INTERRUPT AUTOVECTOR
TAP INSTRUCTION VECTORS (0–15)
(RESERVED, COPROCESSOR)
(UNASSIGNED, RESERVED)
USER-DEFINED VECTORS
0000
0004
0008
000C
0010
0014
0018
001C
0020
0024
0028
002C
0030
0034
0038
003C
0040–005C
006C
0064
0068
006C
0070
0074
0078
007C
0080–00BC
00C0–00EB
00EC–00FC
0100–03FC
VECTOR
OFFSET
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16–23
24
25
26
27
28
29
30
31
32–47
48–58
59–63
64–255
VECTOR
NUMBER TYPE OF
EXCEPTION
$YFF000
$YFFA00
SIM
$YFFA80
RESERVED
$YFFC00
QSM
$YFFB00
TPURAM CTL
$YFFB40
RESERVED
$YFFE00
TPU
$YFFFFF
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OVERVIEW MC68332
3-12 USER’S MANUAL
Figure 3-6 Separate Supervisor and User Space Map
332 S/U SEP MAP
INTERNAL REGISTERS
$000000
$FFFFFF
$FF0000
SUPERVISOR
SPACE
$7FF000 INTERNAL REGISTERS
NOTES:
1. Location of the exception vector table is determined by the vector base register. The vector address is the sum of the vector
base register and the vector offset.
2. Location of the module control registers is determined by the state of the module mapping (MM) bit in the SIM configure register.
Y = M111, where M is the state of the MM bit.
3. Unused addresses within the internal register block are mapped externally. "RESERVED" blocks are not mapped externally.
$XX03FC
$XX0000RESET — INITIAL STACK POINTER
RESET — INITIAL PC
BUS ERROR
ADDRESS ERROR
ILLEGAL INSTRUCTION
ZERO DIVISION
CHK, CHK2 INSTRUCTIONS
TRAPcc, TRAPV INSTRUCTIONS
PRIVILEGE VIOLATION
TRACE
LINE 1010 EMULATOR
LINE 1111 EMULATOR
HARDWARE BREAKPOINT
(RESERVED COPROCESSOR PROTOCOL VIOLATION)
FORMAT ERROR AND UNINITIALIZED INTERRUPT
FORMAT ERROR AND UNINITIALIZED INTERRUPT
(UNASSIGNED, RESERVED)
SPURIOUS INTERRUPT
LEVEL 1 INTERRUPT AUTOVECTOR
LEVEL 2 INTERRUPT AUTOVECTOR
LEVEL 3 INTERRUPT AUTOVECTOR
LEVEL 4 INTERRUPT AUTOVECTOR
LEVEL 5 INTERRUPT AUTOVECTOR
LEVEL 6 INTERRUPT AUTOVECTOR
LEVEL 7 INTERRUPT AUTOVECTOR
TAP INSTRUCTION VECTORS (0–15)
(RESERVED, COPROCESSOR)
(UNASSIGNED, RESERVED)
USER-DEFINED VECTORS
0000
0004
0008
000C
0010
0014
0018
001C
0020
0024
0028
002C
0030
0034
0038
003C
0040–005C
006C
0064
0068
006C
0070
0074
0078
007C
0080–00BC
00C0–00EB
00EC–00FC
0100–03FC
VECTOR
OFFSET
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16–23
24
25
26
27
28
29
30
31
32–47
48–58
59–63
64–255
VECTOR
NUMBER TYPE OF
EXCEPTION
$YFF000
$YFFA00
SIM
$YFFA80
RESERVED
$YFFC00
QSM
$YFFB00
TPURAM CTL
$YFFB40
RESERVED
$YFFE00
TPU
$YFFFFF INTERNAL REGISTERS
INTERNAL REGISTERS
USER
SPACE
$000000
$7FF0004
$FF00004
$FFFFFF
4. Some internal registers are not available in user space.
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MC68332 OVERVIEW
USER’S MANUAL 3-13
Figure 3-7 Supervisor Space (Separate Program/Data Space) Map
332 SUPER P/D MAP
INTERNAL REGISTERS
$000000
$FFFFFF
$FF0000
$7FF000 INTERNAL REGISTERS
NOTES:
1. Location of the exception vector table is determined by the vector base register. The vector address is the sum of the vector
base register and the vector offset.
2. Location of the module control registers is determined by the state of the module mapping (MM) bit in the SIM configure register.
Y = M111, where M is the state of the MM bit.
3. Unused addresses within the internal register block are mapped externally. "RESERVED" blocks are not mapped externally.
$XX03FC
$XX0000RESET — INITIAL STACK POINTER
RESET — INITIAL PC
BUS ERROR
ADDRESS ERROR
ILLEGAL INSTRUCTION
ZERO DIVISION
CHK, CHK2 INSTRUCTIONS
TRAPcc, TRAPV INSTRUCTIONS
PRIVILEGE VIOLATION
TRACE
LINE 1010 EMULATOR
LINE 1111 EMULATOR
HARDWARE BREAKPOINT
(RESERVED COPROCESSOR PROTOCOL VIOLATION)
FORMAT ERROR AND UNINITIALIZED INTERRUPT
FORMAT ERROR AND UNINITIALIZED INTERRUPT
(UNASSIGNED, RESERVED)
SPURIOUS INTERRUPT
LEVEL 1 INTERRUPT AUTOVECTOR
LEVEL 2 INTERRUPT AUTOVECTOR
LEVEL 3 INTERRUPT AUTOVECTOR
LEVEL 4 INTERRUPT AUTOVECTOR
LEVEL 5 INTERRUPT AUTOVECTOR
LEVEL 6 INTERRUPT AUTOVECTOR
LEVEL 7 INTERRUPT AUTOVECTOR
TAP INSTRUCTION VECTORS (0–15)
(RESERVED, COPROCESSOR)
(UNASSIGNED, RESERVED)
USER-DEFINED VECTORS
0000
0004
0008
000C
0010
0014
0018
001C
0020
0024
0028
002C
0030
0034
0038
003C
0040–005C
006C
0064
0068
006C
0070
0074
0078
007C
0080–00BC
00C0–00EB
00EC–00FC
0100–03FC
VECTOR
OFFSET
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16–23
24
25
26
27
28
29
30
31
32–47
48–58
59–63
64–255
VECTOR
NUMBER
$YFF000
$YFFA00
SIM
$YFFA80
RESERVED
$YFFC00
QSM
$YFFB00
TPURAM CTL
$YFFB40
RESERVED
$YFFE00
TPU
$YFFFFF
$000000
$FFFFFF
4. Some internal registers are not available in user space.
$XX0004
$XX0000
RESET — INITIAL STACK POINTER
RESET — INITIAL PC
0000
0004
VECTOR
OFFSET
0
1
VECTOR
NUMBER EXCEPTION VECTORS LOCATED
IN SUPERVISOR PROGRAM SPACE
EXCEPTION VECTORS LOCATED
IN SUPERVISOR DATA SPACE
SUPERVISOR
DATA
SPACE
SUPERVISOR
PROGRAM
SPACE
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OVERVIEW MC68332
3-14 USER’S MANUAL
Figure 3-8 User Space (Separate Program/Data Space) Map
332 USER P/D MAP
INTERNAL REGISTERS
$000000
$FFFFFF
$FF0000
$7FF000 INTERNAL REGISTERS
NOTES:
1. Location of the exception vector table is determined by the vector base register. The vector address is the sum of the vector
base register and the vector offset.
2. Unused addresses within the internal register block are mapped externally. "RESERVED" blocks are not mapped externally.
$YFF000
$YFFA00
SIM
$YFFA80
RESERVED
$YFFC00
QSM
$YFFB00
TPURAM CTL
$YFFB40
RESERVED
$YFFE00
TPU
$YFFFFF
3. Some internal registers are not available in user space.
$000000
$FFFFFF
USER
DATA
SPACE
USER
PROGRAM
SPACE
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MC68332 OVERVIEW
USER’S MANUAL 3-15
3.7 System Reset
The following information is a concise reference only. MC68332 system reset is a com-
plex operation. To understand operation during and after reset, refer to SECTION 4
SYSTEM INTEGRATION MODULE, paragraph 4.6 Reset for more complete discus-
sion of the reset function.
3.7.1 SIM Reset Mode Selection
The logic states of certain data bus pins during reset determine SIM operating config-
uration. In addition, the state of the MODCLK pin determines system clock source and
the state of the BKPT pin determines what happens during subsequent breakpoint as-
sertions. Table 3-6 is a summary of reset mode selection options.
Table 3-6 SIM Reset Mode Selection
Mode Select Pin Default Function
(Pin Left High) Alternate Function
(Pin Pulled Low)
DATA0 CSBOOT 16-Bit CSBOOT 8-Bit
DATA1 CS0
CS1
CS2
BR
BG
BGACK
DATA2 CS3
CS4
CS5
FC0
FC1
FC2
DATA3
DATA4
DATA5
DATA6
DATA7
CS6
CS[7:6]
CS[8:6]
CS[9:6]
CS[10:6]
ADDR19
ADDR[20:19]
ADDR[21:19]
ADDR[22:19]
ADDR[23:19]
DATA8 DSACK0, DSACK1,
AVEC, DS, AS,
SIZ[1:0]
PORTE
DATA9 IRQ[7:1]
MODCLK
PORTF
DATA11 Test Mode Disabled Test Mode Enabled
MODCLK VCO = System Clock EXTAL = System Clock
BKPT Background Mode Disabled Background Mode Enabled
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OVERVIEW MC68332
3-16 USER’S MANUAL
3.7.2 MCU Module Pin Function During Reset
Generally, pins associated with modules other than the SIM default to port functions,
and input/output ports are set to input state. This is accomplished by disabling pin
functions in the appropriate control registers, and by clearing the appropriate port data
direction registers. Refer to individual module sections in this manual for more infor-
mation. Table 3-7 is a summary of module pin function out of reset.
Table 3-7 Module Pin Functions
Module Pin Mnemonic Function
CPU32 DSI/IFETCH DSI/IFETCH
DSO/IPIPE DSO/IPIPE
BKPT/DSCLK BKPT/DSCLK
TPU TPUCH[15:0] TPU Input
T2CLK TCR2 Clock
QSM PQS7/TXD Discrete Input
PQS[6:4]/PCS[3:1] Discrete Input
PQS3/PCS0/SS Discrete Input
PQS2/SCK Discrete Input
PQS1/MOSI Discrete Input
PQS0/MISO Discrete Input
RXD RXD
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MC68332 SYSTEM INTEGRATION MODULE
USER’S MANUAL 4-1
SECTION 4 SYSTEM INTEGRATION MODULE
This section is an overview of SIM function. Refer to the
SIM Reference Manual
(SIM-
RM/AD) for a comprehensive discussion of SIM capabilities. Refer to APPENDIX D
REGISTER SUMMARY for information concerning the SIM address map and register
structure.
4.1 General
The system integration module (SIM) consists of five functional blocks. Figure 4-1 is
a block diagram of the SIM.
The system configuration and protection block controls configuration parameters and
provides bus and software watchdog monitors. In addition, it provides a periodic inter-
rupt generator to support execution of time-critical control routines.
The system clock generates clock signals used by the SIM, other IMB modules, and
external devices.
The external bus interface handles the transfer of information between IMB modules
and external address space. EBI pins can also be configured for use as general-pur-
pose I/O ports E and F.
The chip-select block provides 12 chip-select signals. Each chip-select signal has an
associated base register and option register that contain the programmable character-
istics of that chip select. Chip-select pins can also be configured for use as general-
purpose output port C.
The system test block incorporates hardware necessary for testing the MCU. It is used
to perform factory tests, and its use in normal applications is not supported.
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SYSTEM INTEGRATION MODULE MC68332
4-2 USER’S MANUAL
Figure 4-1 System Integration Module Block Diagram
4.2 System Configuration and Protection
The system configuration and protection functional block controls module configura-
tion, preserves reset status, monitors internal activity, and provides periodic interrupt
generation. Figure 4-2 is a block diagram of the submodule.
S(C)IM BLOCK
SYSTEM CONFIGURATION
AND PROTECTION
CLOCK SYNTHESIZER
CHIP SELECTS
EXTERNAL BUS INTERFACE
FACTORY TEST
CLKOUT
EXTAL
MODCLK
CHIP SELECTS
EXTERNAL BUS
RESET
TSC
FREEZE/QUOT
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MC68332 SYSTEM INTEGRATION MODULE
USER’S MANUAL 4-3
Figure 4-2 System Configuration and Protection
4.2.1 Module Mapping
Control registers for all the modules in the microcontroller are mapped into a 4-Kbyte
block. The state of the module mapping bit (MM) in the SIM configuration register
(SIMCR) determines where the control register block is located in the system memory
map. When MM = 0, register addresses range from $7FF000 to $7FFFFF; when MM
= 1, register addresses range from $FFF000 to $FFFFFF.
4.2.2 Interrupt Arbitration
Each module that can generate interrupt requests has an interrupt arbitration (IARB)
field. Arbitration between interrupt requests of the same priority is performed by serial
contention between IARB field bit values. Contention must take place whenever an in-
SYS PROTECT BLOCK
MODULE CONFIGURATION
AND TEST
RESET STATUS
HALT MONITOR
BUS MONITOR
SPURIOUS INTERRUPT MONITOR
SOFTWARE WATCHDOG TIMER
PERIODIC INTERRUPT TIMER
PRESCALER
CLOCK
BERR
RESET REQUEST
RESET REQUEST
29
IRQ [7:1]
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SYSTEM INTEGRATION MODULE MC68332
4-4 USER’S MANUAL
terrupt request is acknowledged, even when there is only a single request pending.
For an interrupt to be serviced, the appropriate IARB field must have a non-zero value.
If an interrupt request from a module with an IARB field value of %0000 is recognized,
the CPU32 processes a spurious interrupt exception.
Because the SIM routes external interrupt requests to the CPU32, the SIM IARB field
value is used for arbitration between internal and external interrupts of the same pri-
ority. The reset value of IARB for the SIM is %1111, and the reset IARB value for all
other modules is %0000, which prevents SIM interrupts from being discarded during
initialization. Refer to 4.7 Interrupts for a discussion of interrupt arbitration.
4.2.3 Show Internal Cycles
A show cycle allows internal bus transfers to be monitored externally. The SHEN field
in the SIMCR determines what the external bus interface does during internal transfer
operations. Table 4-1 shows whether data is driven externally, and whether external
bus arbitration can occur. Refer to 4.5.6.2 Show Cycles for more information.
4.2.4 Factory Test Mode
The internal IMB can serve as slave to an external master for direct module testing.
This test mode is reserved for factory test. Slave mode is enabled by holding DATA11
low during reset. The slave enabled (SLVEN) bit is a read-only bit that shows the reset
state of DATA11.
4.2.5 Register Access
The CPU32 can operate at either of two privilege levels. Supervisor level is more priv-
ileged than user level — all instructions and system resources are available at super-
visor level, but access is restricted at user level. Effective use of privilege level can
protect system resources from uncontrolled access. The state of the S bit in the CPU
status register determines access level, and whether the user or supervisor stack
pointer is used for stacking operations. The SUPV bit places SIM global registers in
either supervisor or user data space. When SUPV = 0, registers with controlled access
are accessible from either the user or supervisor privilege level; when SUPV = 1, reg-
isters with controlled access are restricted to supervisor access only.
4.2.6 Reset Status
The reset status register (RSR) latches internal MCU status during reset. Refer to
4.6.9 Reset Status Register for more information.
Table 4-1 Show Cycle Enable Bits
SHEN Action
00 Show cycles disabled, external arbitration enabled
01 Show cycles enabled, external arbitration disabled
10 Show cycles enabled, external arbitration enabled
11 Show cycles enabled, external arbitration enabled;
internal activity is halted by a bus grant
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MC68332 SYSTEM INTEGRATION MODULE
USER’S MANUAL 4-5
4.2.7 Bus Monitor
The internal bus monitor checks data and size acknowledge (DSACK) or autovector
(AVEC) signal response times during normal bus cycles. The monitor asserts the in-
ternal bus error (BERR) signal when the response time is excessively long.
DSACK and AVEC response times are measured in clock cycles. Maximum allowable
response time can be selected by setting the bus monitor timing (BMT) field in the sys-
tem protection control register (SYPCR). Table 4-2 shows the periods allowed.
The monitor does not check DSACK response on the external bus unless the CPU32
initiates a bus cycle. The BME bit in SYPCR enables the internal bus monitor for inter-
nal to external bus cycles. If a system contains external bus masters, an external bus
monitor must be implemented and the internal-to-external bus monitor option must be
disabled.
When monitoring transfers to an 8-bit port, the bus monitor does not reset until both
byte accesses of a word transfer are completed. Monitor time-out period must be at
least twice the number of clocks that a single byte access requires.
4.2.8 Halt Monitor
The halt monitor responds to an assertion of the HALT signal on the internal bus. Refer
to 4.5.5.2 Double Bus Faults for more information. Halt monitor reset can be inhibited
by the halt monitor (HME) bit in SYPCR.
4.2.9 Spurious Interrupt Monitor
During interrupt exception processing, the CPU32 normally acknowledges an interrupt
request, recognizes the highest priority source, and then acquires a vector or re-
sponds to a request for autovectoring. The spurious interrupt monitor asserts the in-
ternal bus error signal (BERR) if no interrupt arbitration occurs during interrupt
exception processing. The assertion of BERR causes the CPU32 to load the spurious
interrupt exception vector into the program counter. The spurious interrupt monitor
cannot be disabled. Refer to 4.7 Interrupts for further information. For detailed infor-
mation about interrupt exception processing, refer to SECTION 5 CENTRAL PRO-
CESSING UNIT.
4.2.10 Software Watchdog
The software watchdog is controlled by the software watchdog enable (SWE) bit in
SYPCR. When enabled, the watchdog requires that a service sequence be written to
software service register SWSR on a periodic basis. If servicing does not take place,
the watchdog times out and asserts the reset signal.
Table 4-2 Bus Monitor Period
BMT Bus Monitor Time-out Period
00 64 System Clocks
01 32 System Clocks
10 16 System Clocks
11 8 System Clocks
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SYSTEM INTEGRATION MODULE MC68332
4-6 USER’S MANUAL
Perform a software watchdog service sequence as follows:
1. Write $55 to SWSR.
2. Write $AA to SWSR.
Both writes must occur before time-out in the order listed, but any number of instruc-
tions can be executed between the two writes.
Watchdog clock rate is affected by the software watchdog prescale (SWP) and soft-
ware watchdog timing (SWT) fields in SYPCR.
SWP determines system clock prescaling for the watchdog timer and determines that
one of two options, either no prescaling or prescaling by a factor of 512, can be select-
ed. The value of SWP is affected by the state of the MODCLK pin during reset, as
shown in Table 4-3. System software can change SWP value.
The SWT field selects the divide ratio used to establish software watchdog time-out
period. Time-out period is given by the following equations.
or
Table 4-4 shows the ratio for each combination of SWP and SWT bits. When SWT[1:0]
are modified, a watchdog service sequence must be performed before the new time-
out period can take effect.
Figure 4-3 is a block diagram of the watchdog timer and the clock control for the pe-
riodic interrupt timer.
Table 4-3 MODCLK Pin and
SWP Bit During Reset
MODCLK SWP
0 (External Clock) 1 (÷ 512)
1 (Internal Clock) 0 (÷ 1)
Table 4-4 Software Watchdog Ratio
SWP SWT Ratio
000
2
9
001
2
11
010
2
13
011
2
15
100
2
18
101
2
20
110
2
22
111
2
24
Time-out Period 1
EXTAL Frequency Divide Ratio⁄
-------------------------------------------------------------------------------------=
Time-out Period Divide Ratio
EXTAL Frequency
-------------------------------------------------=
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MC68332 SYSTEM INTEGRATION MODULE
USER’S MANUAL 4-7
Figure 4-3 Periodic Interrupt Timer and Software Watchdog Timer
4.2.11 Periodic Interrupt Timer
The periodic interrupt timer allows the generation of interrupts of specific priority at pre-
determined intervals. This capability is often used to schedule control system tasks
that must be performed within time constraints. The timer consists of a prescaler, a
modulus counter, and registers that determine interrupt timing, priority and vector as-
signment. Refer to SECTION 5 CENTRAL PROCESSING UNIT for further information
about interrupt exception processing.
The periodic interrupt modulus counter is clocked by a signal derived from the buffered
crystal oscillator (EXTAL) input pin unless an external frequency source is used. The
value of the periodic timer prescaler (PTP) bit in the periodic interrupt timer register
(PITR) determines system clock prescaling for the watchdog timer. One of two op-
tions, either no prescaling, or prescaling by a factor of 512, can be selected. The value
of PTP is affected by the state of the MODCLK pin during reset, as shown in Table 4-
5. System software can change PTP value.
Either clock signal (EXTAL or EXTAL ÷ 512) is divided by four before driving the mod-
ulus counter (PITCLK). The modulus counter is initialized by writing a value to the pe-
riodic timer modulus (PITM) field in the PITR. A zero value turns off the periodic timer.
When the modulus counter value reaches zero, an interrupt is generated. The modu-
lus counter is then reloaded with the value in PITM and counting repeats. If a new val-
ue is written to PITR, it is loaded into the modulus counter when the current count is
completed.
Table 4-5 MODCLK Pin and
PTP Bit at Reset
MODCLK PTP
0 (External Clock) 1 (÷ 512)
1 (Internal Clock) 0 (÷ 1)
CLOCK
DISABLE PRESCALER (29)
CLOCK
MUX
EXTAL
LPSTOP
SWP
PTP
FREEZE
SWCLK
PITCLK
PRECLK
29
÷ 4
RESET
PIT
INTERRUPT
PITR
SWT1
SWT0
SWE
15 STAGE
DIVIDER CHAIN (215)
211 213 215
8-BIT MODULUS
PIT BLOCK
COUNTER
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SYSTEM INTEGRATION MODULE MC68332
4-8 USER’S MANUAL
Use the following expression to calculate timer period.
Interrupt priority and vectoring are determined by the values of the periodic interrupt
request level (PIRQL) and periodic interrupt vector (PIV) fields in the periodic interrupt
control register (PICR).
Content of PIRQL is compared to the CPU32 interrupt priority mask to determine
whether the interrupt is recognized. Table 4-6 shows priority of PIRQL values. Be-
cause of SIM hardware prioritization, a PIT interrupt is serviced before an external in-
terrupt request of the same priority. The periodic timer continues to run when the
interrupt is disabled.
The PIV field contains the periodic interrupt vector. The vector is placed on the IMB
when an interrupt request is made. The vector number used to calculate the address
of the appropriate exception vector in the exception vector table. Reset value of the
PIV field is $0F, which corresponds to the uninitialized interrupt exception vector.
4.2.12 Low-Power Stop Operation
When the CPU32 executes the LPSTOP instruction, the current interrupt priority mask
is stored in the clock control logic, internal clocks are disabled according to the state
of the STSIM bit in the SIMCR, and the MCU enters low-power stop mode. The bus
monitor, halt monitor, and spurious interrupt monitor are all inactive during low-power
stop.
During low-power stop, the clock input to the software watchdog timer is disabled and
the timer stops. The software watchdog begins to run again on the first rising clock
edge after low-power stop ends. The watchdog is not reset by low-power stop. A ser-
vice sequence must be performed to reset the timer.
The periodic interrupt timer does not respond to the LPSTOP instruction, but continues
to run during LPSTOP. To stop the periodic interrupt timer, PITR must be loaded with
a zero value before the LPSTOP instruction is executed. A PIT interrupt, or an external
interrupt request, can bring the MCU out of the low-power stop condition if it has a
higher priority than the interrupt mask value stored in the clock control logic when low-
power stop is initiated. LPSTOP can be terminated by a reset.
Table 4-6 Periodic Interrupt Priority
PIRQL Priority Level
000 Periodic Interrupt Disabled
001 Interrupt Priority Level 1
010 Interrupt Priority Level 2
011 Interrupt Priority Level 3
100 Interrupt Priority Level 4
101 Interrupt Priority Level 5
110 Interrupt Priority Level 6
111 Interrupt Priority Level 7
PIT Period PIT Modulus()Prescaler Value()4()
EXTAL Frequency
----------------------------------------------------------------------------------------------=
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MC68332 SYSTEM INTEGRATION MODULE
USER’S MANUAL 4-9
4.2.13 Freeze Operation
The FREEZE signal halts MCU operations during debugging. FREEZE is asserted in-
ternally by the CPU32 if a breakpoint occurs while background mode is enabled. When
FREEZE is asserted, only the bus monitor, software watchdog, and periodic interrupt
timer are affected. The halt monitor and spurious interrupt monitor continue to operate
normally. Setting the freeze bus monitor (FRZBM) bit in the SIMCR disables the bus
monitor when FREEZE is asserted, and setting the freeze software watchdog
(FRZSW) bit disables the software watchdog and the periodic interrupt timer when
FREEZE is asserted. When FRZSW is set, FREEZE assertion must be at least two
times the PIT clock source period to ensure an accurate number of PIT counts.
4.3 System Clock
The system clock in the SIM provides timing signals for the IMB modules and for an
external peripheral bus. Because the MCU is a fully static design, register and memory
contents are not affected when the clock rate changes. System hardware and software
support changes in clock rate during operation.
The system clock signal can be generated in one of three ways. An internal phase-
locked loop can synthesize the clock from either an internal reference or an external
reference, or the clock signal can be input from an external frequency source. Keep
these clock sources in mind while reading the rest of this section. Figure 4-4 is a block
diagram of the system clock. Refer to APPENDIX A ELECTRICAL CHARACTERIS-
TICS for clock specifications.
Figure 4-4 System Clock Block Diagram
32 PLL BLOCK
CLKOUT
PHASE
COMPARATOR LOW-PASS
FILTER VCO
CRYSTAL
OSCILLATOR
SYSTEM
CLOCK
SYSTEM CLOCK CONTROL
FEEDBACK DIVIDER W
X
Y
EXTAL XTAL XFC VDDSYN
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SYSTEM INTEGRATION MODULE MC68332
4-10 USER’S MANUAL
4.3.1 Clock Sources
The state of the clock mode (MODCLK) pin during reset determines clock source.
When MODCLK is held high during reset, the clock synthesizer generates a clock sig-
nal from either an internal or an external reference frequency — the clock synthesizer
control register (SYNCR) determines operating frequency and mode of operation.
When MODCLK is held low during reset, the clock synthesizer is disabled and an ex-
ternal system clock signal must be applied — SYNCR control bits have no effect.
To generate a reference frequency using the internal oscillator a reference crystal
must be connected between the EXTAL and XTAL pins. Figure 4-5 shows a recom-
mended circuit.
Figure 4-5 System Clock Oscillator Circuit
If an external reference signal or an external system clock signal is applied via the EX-
TAL pin, the XTAL pin must be left floating. External reference signal frequency must
be less than or equal to maximum specified reference frequency. External system
clock signal frequency must be less than or equal to maximum specified system clock
frequency.
When an external system clock signal is applied (PLL disabled, MODCLK = 0 during
reset), the duty cycle of the input is critical, especially at operating frequencies close
to maximum. The relationship between clock signal duty cycle and clock signal period
is expressed:
Minimum External Clock Period =
4.3.2 Clock Synthesizer Operation
VDDSYN is used to power the clock circuits when either an internal or an external ref-
erence frequency is applied. A separate power source increases MCU noise immunity
and can be used to run the clock when the MCU is powered down. A quiet power sup-
VSSI
EXTAL
XTAL
22 pF*
C1
330k
R1
32 OSCILLATOR
Resistance and capacitance based on a test circuit constructed with a DAISHINKU DMX-38 32.768-kHz crystal.
Specific components must be based on crystal type. Contact crystal vendor for exact circuit.
*
22 pF*
C2
10M
R2
Minimum External Clock High Low Time⁄
50% Percentage Variation of External Clock Input Duty Cycle–
----------------------------------------------------------------------------------------------------------------------------------------------------------------------
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MC68332 SYSTEM INTEGRATION MODULE
USER’S MANUAL 4-11
ply must be used as the VDDSYN source. Adequate external bypass capacitors should
be placed as close as possible to the VDDSYN pin to assure stable operating frequen-
cy. When an external system clock signal is applied and the PLL is disabled, VDDSYN
should be connected to the VDD supply. Refer to the
SIM Reference Manual
(SIMRM/
AD) for more information regarding system clock power supply conditioning.
A voltage controlled oscillator (VCO) generates the system clock signal. To maintain
a 50% clock duty cycle, VCO frequency is either two or four times system clock fre-
quency, depending on the state of the X bit in SYNCR. A portion of the clock signal is
fed back to a divider/counter. The divider controls the frequency of one input to a
phase comparator. The other phase comparator input is a reference signal, either from
the crystal oscillator or from an external source. The comparator generates a control
signal proportional to the difference in phase between the two inputs. The signal is low-
pass filtered and used to correct VCO output frequency.
Filter geometry can vary, depending upon the external environment and required clock
stability. Figure 4-6 shows two recommended filters. XFC pin leakage must be as
specified in APPENDIX A ELECTRICAL CHARACTERISTICS to maintain optimum
stability and PLL performance.
An external filter network connected to the XFC pin is not required when an external
system clock signal is applied and the PLL is disabled. The XFC pin must be left float-
ing in this case.
Figure 4-6 System Clock Filter Networks
The synthesizer locks when VCO frequency is equal to EXTAL frequency. Lock time
is affected by the filter time constant and by the amount of difference between the two
comparator inputs. Whenever comparator input changes, the synthesizer must relock.
Lock status is shown by the SLOCK bit in SYNCR. During power-up, the MCU does
not come out of reset state until the synthesizer locks. Crystal type, characteristic fre-
quency, and layout of external oscillator circuitry affect lock time.
16/32 XFC CONN
1. Maintain low-leakage on the XFC node. See Appendix A electrical characteristics for more information.
2. Recommended loop filter for reduced sensitivity to low-frequency noise.
0.01µF
0.1µF
NORMAL OPERATING
ENVIRONMENT HIGH-STABILITY OPERATING
ENVIRONMENT
C4
C1
VSSI
VDDSYN
XFC1
0.1µF
C3
0.01µF
0.1µF
C4
C1
VSSI VDDSYN
XFC1, 2
0.1µF
C3
0.01µF
C2
18kΩ
R1
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SYSTEM INTEGRATION MODULE MC68332
4-12 USER’S MANUAL
When the clock synthesizer is used, control register SYNCR determines operating fre-
quency and various modes of operation. The SYNCR W bit controls a three-bit pres-
caler in the feedback divider. Setting W increases VCO speed by a factor of four. The
SYNCR Y field determines the count modulus for a modulo 64 down counter, causing
it to divide by a value of Y + 1. When W or Y values change, VCO frequency changes,
and there is a VCO relock delay. The SYNCR X bit controls a divide-by-two circuit that
is not in the synthesizer feedback loop. When X = 0 (reset state), the divider is en-
abled, and system clock frequency is one-fourth VCO frequency; setting X disables
the divider, doubling clock speed without changing VCO speed. There is no relock de-
lay when clock speed is changed by the X bit.
Clock frequency is determined by SYNCR bit settings as follows:
The reset state of SYNCR ($3F00) produces a modulus-64 count.
For the device to perform correctly, system clock and VCO frequencies selected by
the W, X, and Y bits must be within the limits specified for the MCU. Do not use a com-
bination of bit values that selects either an operating frequency or a VCO frequency
greater than the maximum specified values in APPENDIX A ELECTRICAL CHARAC-
TERISTICS.
Table 4-7 shows clock control multipliers for all possible combinations of SYNCR bits.
Table 4-8 shows clock frequencies available with a 32.768-kHz reference and a max-
imum specified clock frequency of 20.97 MHz.
Table 4-7 Clock Control Multipliers
To obtain clock frequency in kilohertz, find counter modulus in the left column, then multiply reference frequency by value
in appropriate prescaler cell.
Modulus Prescalers
Y [W:X] = 00 [W:X] = 01 [W:X] = 10 [W:X] = 11
000000 4 8 16 32
000001 8 16 32 64
000010 12 24 48 96
011111 16 32 64 128
000011 20 40 80 160
000100 24 48 96 192
000101 28 56 112 224
000110 32 64 128 256
000111 36 72 144 288
001000 40 80 160 320
001001 44 88 176 352
001010 48 96 192 384
001011 52 104 208 416
001100 56 112 224 448
001101 60 120 240 480
001110 64 128 256 512
001111 68 136 272 544
010000 72 144 288 576
010001 76 152 304 608
FSYSTEM FREFERENCE 4Y 1+()2
2W X+
()[]=
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MC68332 SYSTEM INTEGRATION MODULE
USER’S MANUAL 4-13
010010 80 160 320 640
010011 84 168 336 672
010100 88 176 352 704
010101 92 184 368 736
010110 96 192 384 768
010111 100 200 400 800
011000 104 208 416 832
011001 108 216 432 864
011010 112 224 448 896
011011 116 232 464 928
011100 120 240 480 960
011101 124 248 496 992
011110 128 256 512 1024
100000 132 264 528 1056
100001 136 272 544 1088
100010 140 280 560 1120
100011 144 288 576 1152
100100 148 296 592 1184
100101 152 304 608 1216
100110 156 312 624 1248
100111 160 320 640 1280
101000 164 328 656 1312
101001 168 336 672 1344
101010 172 344 688 1376
101011 176 352 704 1408
101100 180 360 720 1440
101101 184 368 736 1472
101110 188 376 752 1504
101111 192 384 768 1536
110000 196 392 784 1568
110001 200 400 800 1600
110010 204 408 816 1632
110011 208 416 832 1664
110100 212 424 848 1696
110101 216 432 864 1728
110110 220 440 880 1760
110111 224 448 896 1792
111000 228 456 912 1824
111001 232 464 928 1856
111010 236 472 944 1888
111011 240 480 960 1920
111100 244 488 976 1952
111101 248 496 992 1984
111110 252 504 1008 2016
111111 256 512 1024 2048
Table 4-7 Clock Control Multipliers (Continued)
To obtain clock frequency in kilohertz, find counter modulus in the left column, then multiply reference frequency by value
in appropriate prescaler cell.
Modulus Prescalers
Y [W:X] = 00 [W:X] = 01 [W:X] = 10 [W:X] = 11
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SYSTEM INTEGRATION MODULE MC68332
4-14 USER’S MANUAL
Table 4-8 System Frequencies from 32.768–kHz Reference
To obtain clock frequency in kilohertz, find counter modulus in the left column, then multiply reference frequency by value
in appropriate prescaler cell.
Modulus Prescaler
Y [W:X] = 00 [W:X] = 01 [W:X] = 10 [W:X] = 11
000000 131 262 524 1049
000001 262 524 1049 2097
000010 393 786 1573 3146
000011 524 1049 2097 4194
000100 655 1311 2621 5243
000101 786 1573 3146 6291
000110 918 1835 3670 7340
000111 1049 2097 4194 8389
001000 1180 2359 4719 9437
001001 1311 2621 5243 10486
001010 1442 2884 5767 11534
001011 1573 3146 6291 12583
001100 1704 3408 6816 13631
001101 1835 3670 7340 14680
001110 1966 3932 7864 15729
001111 2097 4194 8389 16777
010000 2228 4456 8913 17826
010001 2359 4719 9437 18874
010010 2490 4981 9961 19923
010011 2621 5243 10486 20972
010100 2753 5505 11010 22020
010101 2884 5767 11534 23069
010110 3015 6029 12059 24117
010111 3146 6291 12583 25166
011000 3277 6554 13107 26214
011001 3408 6816 13631 27263
011010 3539 7078 14156 28312
011011 3670 7340 14680 29360
011100 3801 7602 15204 30409
011101 3932 7864 15729 31457
011110 4063 8126 16253 32506
011111 4194 8389 16777 33554
100000 4325 8651 17302 34603
100001 4456 8913 17826 35652
100010 4588 9175 18350 36700
100011 4719 9437 18874 37749
100100 4850 9699 19399 38797
100101 4981 9961 19923 39846
100110 5112 10224 20447 40894
100111 5243 10486 20972 41943
101000 5374 10748 21496 42992
101001 5505 11010 22020 44040
101010 5636 11272 22544 45089
101011 5767 11534 23069 46137
101100 5898 11796 23593 47186
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MC68332 SYSTEM INTEGRATION MODULE
USER’S MANUAL 4-15
4.3.3 External Bus Clock
The state of the external clock division bit (EDIV) in SYNCR determines clock rate for
the external bus clock signal (ECLK) available on pin ADDR23. ECLK is a bus clock
for MC6800 devices and peripherals. ECLK frequency can be set to system clock fre-
quency divided by eight or system clock frequency divided by sixteen. The clock is en-
abled by the CS10 field in chip select pin assignment register 1 (CSPAR1). ECLK
operation during low-power stop is described in the following paragraph. Refer to 4.8
Chip Selects for more information about the external bus clock.
4.3.4 Low-Power Operation
Low-power operation is initiated by the CPU32. To reduce power consumption selec-
tively, the CPU can set the STOP bits in each module configuration register. To mini-
mize overall microcontroller power consumption, the CPU can execute the LPSTOP
instruction, which causes the SIM to turn off the system clock.
When individual module STOP bits are set, clock signals inside each module are
turned off, but module registers are still accessible.
When the CPU executes LPSTOP, a special CPU space bus cycle writes a copy of
the current interrupt mask into the clock control logic. The SIM brings the MCU out of
low-power operation when either an interrupt of higher priority than the stored mask or
a reset occurs. Refer to 4.5.4.2 LPSTOP Broadcast Cycle and SECTION 5 CEN-
TRAL PROCESSING UNIT for more information.
101101 6029 12059 24117 48234
101110 6160 12321 24642 49283
101111 6291 12583 25166 50332
110000 6423 12845 25690 51380
110001 6554 13107 26214 52428
110010 6685 13369 26739 53477
110011 6816 13631 27263 54526
110100 6947 13894 27787 55575
110101 7078 14156 28312 56623
110110 7209 14418 28836 57672
110111 7340 14680 29360 58720
111000 7471 14942 2988 59769
111001 7602 15204 30409 60817
111010 7733 15466 30933 61866
111011 7864 15729 31457 62915
111100 7995 15991 31982 63963
111101 8126 16253 32506 65011
111110 8258 16515 33030 66060
111111 8389 16777 33554 67109
Table 4-8 System Frequencies from 32.768–kHz Reference (Continued)
To obtain clock frequency in kilohertz, find counter modulus in the left column, then multiply reference frequency by value
in appropriate prescaler cell.
Modulus Prescaler
Y [W:X] = 00 [W:X] = 01 [W:X] = 10 [W:X] = 11
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SYSTEM INTEGRATION MODULE MC68332
4-16 USER’S MANUAL
During a low-power stop, unless the system clock signal is supplied by an external
source and that source is removed, the SIM clock control logic and the SIM clock sig-
nal (SIMCLK) continue to operate. The periodic interrupt timer and input logic for the
RESET and IRQ pins are clocked by SIMCLK. The SIM can also continue to generate
the CLKOUT signal while in low-power mode.
The stop mode system integration module clock (STSIM) and stop mode external
clock (STEXT) bits in SYNCR determine clock operation during low-power stop. Table
4-9 is a summary of the effects of STSIM and STEXT. MODCLK value is the logic level
on the MODCLK pin during the last reset before LPSTOP execution. Any clock in the
off state is held low. If the synthesizer VCO is turned off during LPSTOP, there is a
PLL relock delay after the VCO is turned back on.
4.3.5 Loss of Reference Signal
The state of the reset enable (RSTEN) bit in SYNCR determines what happens when
clock logic detects a reference failure.
When RSTEN is cleared (default state out of reset), the clock synthesizer is forced
into an operating condition referred to as limp mode. Limp mode frequency varies
from device to device, but maximum limp frequency does not exceed one half max-
imum system clock when X = 0, or maximum system clock frequency when X = 1.
When RSTEN is set, the SIM resets the MCU.
The limp status bit (SLIMP) in SYNCR indicates whether the synthesizer has a refer-
ence signal. It is set when a reference failure is detected.
Table 4-9 Clock Control
Mode Pins SYNCR Bits Clock Status
LPSTOP MODCLK EXTAL STSIM STEXT SIMCLK CLKOUT ECLK
No 0 External
Clock
X X External
Clock
External
Clock
External
Clock
Yes 0 External
Clock
0 0 External
Clock
Off Off
Yes 0 External
Clock
0 1 External
Clock
External
Clock
External
Clock
Yes 0 External
Clock
1 0 External
Clock
Off Off
Yes 0 External
Clock
1 1 External
Clock
External
Clock
External
Clock
No 1 Crystal or
Reference
X X VCO VCO VCO
Yes 1 Crystal or
Reference
0 0 Crystal or
Reference
Off Off
Yes 1 Crystal or
Reference
0 1 Crystal or
Reference
Crystal/
Reference
Off
Yes 1 Crystal or
Reference
1 0 VCO Off Off
Yes 1 Crystal or
Reference
1 1 VCO VCO VCO
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MC68332 SYSTEM INTEGRATION MODULE
USER’S MANUAL 4-17
4.4 External Bus Interface
The external bus interface (EBI) transfers information between the internal MCU bus
and external devices. Figure 4-7 shows a basic system with external memory and pe-
ripherals.
Figure 4-7 MCU Basic System
The external bus has 24 address lines and 16 data lines. The EBI provides dynamic
sizing between 8-bit and 16-bit data accesses. It supports byte, word, and long-word
transfers. Ports are accessed through the use of asynchronous cycles controlled by
the data transfer (SIZ1 and SIZ0) and data size acknowledge pins (DSACK1 and
DSACK0). Multiple bus cycles may be required for a transfer to or from an 8-bit port.
The maximum number of bits transferred during an access is referred to as port width.
Widths of eight and sixteen bits can be accessed by asynchronous bus cycles con-
trolled by the data size (SIZ[1:0]) and the data and size acknowledge (DSACK[1:0])
signals. Multiple bus cycles may be required for a dynamically-sized transfer.
To add flexibility and minimize the necessity for external logic, MCU chip-select logic
can be synchronized with EBI transfers. Refer to 4.8 Chip Selects for more informa-
tion.
32 EXAMPLE SYS BLOCK
ADDR[23:0]
SIZ
CLKOUT
AS
FC
DSACK
DS
R/W
DATA[15:0]
CS3
CS5
IRQ
CSBOOT
ADDR[15:0]
SIZ
CLK
DSACK
AS
DS
CS
DATA[15:0]
IACK
IRQ
ADDR[23:0]
DATA[15:8]
CS
R/W
MEMORY
ADDR[23:0]
DATA[7:0]
CS
R/W
MEMORY
MCU
ASYNC BUS
PERIPHERAL
1
2
2
2
1. Can be decoded to provide additional address space.
2. Varies depending upon peripheral memory size.
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SYSTEM INTEGRATION MODULE MC68332
4-18 USER’S MANUAL
4.4.1 Bus Signals
The address bus provides addressing information to external devices. The data bus
transfers 8-bit and 16-bit data between the MCU and external devices. Strobe signals,
one for the address bus and another for the data bus, indicate the validity of an ad-
dress and provide timing information for data.
Control signals indicate the beginning of each bus cycle, the address space it is to take
place in, the size of the transfer, and the type of cycle. External devices decode these
signals and respond to transfer data and terminate the bus cycle. The EBI operates in
an asynchronous mode for any port width.
4.4.1.1 Address Bus
Bus signals ADDR[23:0] define the address of the byte (or the most significant byte)
to be transferred during a bus cycle. The MCU places the address on the bus at the
beginning of a bus cycle. The address is valid while AS is asserted.
4.4.1.2 Address Strobe
Address strobe (AS) is a timing signal that indicates the validity of an address on the
address bus and of many control signals. It is asserted one-half clock after the begin-
ning of a bus cycle.
4.4.1.3 Data Bus
Signals DATA[15:0] form a bidirectional, nonmultiplexed parallel bus that transfers
data to or from the MCU. A read or write operation can transfer eight or sixteen bits of
data in one bus cycle. During a read cycle, the data is latched by the MCU on the last
falling edge of the clock for that bus cycle. For a write cycle, all 16 bits of the data bus
are driven, regardless of the port width or operand size. The MCU places the data on
the data bus one-half clock cycle after AS is asserted in a write cycle.
4.4.1.4 Data Strobe
Data strobe (DS) is a timing signal. For a read cycle, the MCU asserts DS to signal an
external device to place data on the bus. DS is asserted at the same time as AS during
a read cycle. For a write cycle, DS signals an external device that data on the bus is
valid. The MCU asserts DS one full clock cycle after the assertion of AS during a write
cycle.
4.4.1.5 Read/Write Signal
The read/write signal (R/W) determines the direction of the transfer during a bus cycle.
This signal changes state, when required, at the beginning of a bus cycle, and is valid
while AS is asserted. R/W only transitions when a write cycle is preceded by a read
cycle or vice versa. The signal may remain low for two consecutive write cycles.
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USER’S MANUAL 4-19
4.4.1.6 Size Signals
Size signals (SIZ[1:0]) indicate the number of bytes remaining to be transferred during
an operand cycle. They are valid while the address strobe (AS) is asserted. Table 4-
10 shows SIZ0 and SIZ1 encoding.
4.4.1.7 Function Codes
The CPU generates function code output signals FC[2:0] to indicate the type of activity
occurring on the data or address bus. These signals can be considered address ex-
tensions that can be externally decoded to determine which of eight external address
spaces is accessed during a bus cycle.
Address space 7 is designated CPU space. CPU space is used for control information
not normally associated with read or write bus cycles. Function codes are valid while
AS is asserted.
Table 4-11 shows address space encoding.
The supervisor bit in the status register determines whether the CPU is operating in
supervisor or user mode. Addressing mode and the instruction being executed deter-
mine whether a memory access is to program or data space.
4.4.1.8 Data and Size Acknowledge Signals
During normal bus transfers, external devices assert the data and size acknowledge
signals (DSACK[1:0]) to indicate port width to the MCU. During a read cycle, these sig-
nals tell the MCU to terminate the bus cycle and to latch data. During a write cycle, the
signals indicate that an external device has successfully stored data and that the cycle
can terminate. DSACK[1:0] can also be supplied internally by chip-select logic. Refer
to 4.8 Chip Selects for more information.
Table 4-10 Size Signal Encoding
SIZ1 SIZ0 Transfer Size
0 1 Byte
1 0 Word
1 1 3 Byte
0 0 Long Word
Table 4-11 Address Space Encoding
FC2 FC1 FC0 Address Space
0 0 0 Reserved
0 0 1 User Data Space
0 1 0 User Program Space
0 1 1 Reserved
1 0 0 Reserved
1 0 1 Supervisor Data Space
1 1 0 Supervisor Program Space
1 1 1 CPU Space
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SYSTEM INTEGRATION MODULE MC68332
4-20 USER’S MANUAL
4.4.1.9 Bus Error Signal
The bus error signal (BERR) is asserted when a bus cycle is not properly terminated
by DSACK or AVEC assertion. BERR can also be asserted at the same time as
DSACK, provided the appropriate timing requirements are met. Refer to 4.5.5 Bus Ex-
ception Control Cycles for more information.
The internal bus monitor can generate the BERR signal for internal and internal-to-ex-
ternal transfers. An external bus master must provide its own BERR generation and
drive the BERR pin, because the internal BERR monitor has no information about
transfers initiated by an external bus master. Refer to 4.5.6 External Bus Arbitration
for more information.
4.4.1.10 Halt Signal
The halt signa (HALT) can be asserted by an external device for debugging purposes
to cause single bus cycle operation or (in combination with BERR) a retry of a bus cy-
cle in error. The HALT signal affects external bus cycles only, so a program not requir-
ing the use of external bus may continue executing, unaffected by the HALT signal.
When the MCU completes a bus cycle with the HALT signal asserted, DATA[15:0] is
placed in the high-impedance state, and bus control signals are driven inactive; the ad-
dress, function code, size, and read/write signals remain in the same state. If HALT is
still asserted once bus mastership is returned to the MCU, the address, function code,
size, and read/write signals are again driven to their previous states. The MCU does
not service interrupt requests while it is halted. Refer to 4.5.5 Bus Exception Control
Cycles for further information.
4.4.1.11 Autovector Signal
The autovector signal (AVEC) can be used to terminate external interrupt acknowl-
edge cycles. Assertion of AVEC causes the CPU32 to generate vector numbers to lo-
cate an interrupt handler routine. If it is continuously asserted, autovectors are
generated for all external interrupt requests. AVEC is ignored during all other bus cy-
cles. Refer to 4.7 Interrupts for more information. AVEC for external interrupt re-
quests can also be supplied internally by chip-select logic. Refer to 4.8 Chip Selects
for more information. The autovector function is disabled when there is an external bus
master. Refer to 4.5.6 External Bus Arbitration for more information.
4.4.2 Dynamic Bus Sizing
The MCU dynamically interprets the port size of an addressed device during each bus
cycle, allowing operand transfers to or from 8-bit and 16-bit ports.
During an operand transfer cycle, an external device signals its port size and indicates
completion of the bus cycle to the MCU through the use of the DSACK inputs, as
shown in Table 4-12. Chip-select logic can generate data and size acknowledge sig-
nals for an external device. Refer to 4.8 Chip Selects for further information.
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MC68332 SYSTEM INTEGRATION MODULE
USER’S MANUAL 4-21
If the CPU is executing an instruction that reads a long-word operand from a 16-bit
port, the MCU latches the 16 bits of valid data and then runs another bus cycle to ob-
tain the other 16 bits. The operation for an 8-bit port is similar, but requires four read
cycles. The addressed device uses the DSACK signals to indicate the port width. For
instance, a 16-bit device always returns DSACK for a 16-bit port (regardless of wheth-
er the bus cycle is a byte or word operation).
Dynamic bus sizing requires that the portion of the data bus used for a transfer to or
from a particular port size be fixed. A 16-bit port must reside on data bus bits [15:0],
and an 8-bit port must reside on data bus bits [15:8]. This minimizes the number of bus
cycles needed to transfer data and ensures that the MCU transfers valid data.
The MCU always attempts to transfer the maximum amount of data on all bus cycles.
For a word operation, it is assumed that the port is 16 bits wide when the bus cycle
begins.
Operand bytes are designated as shown in Figure 4-8. OP[0:3] represent the order of
access. For instance, OP0 is the most significant byte of a long-word operand, and is
accessed first, while OP3, the least significant byte, is accessed last. The two bytes of
a word-length operand are OP0 (most significant) and OP1. The single byte of a byte-
length operand is OP0.
Figure 4-8 Operand Byte Order
4.4.3 Operand Alignment
The EBI data multiplexer establishes the necessary connections for different combi-
nations of address and data sizes. The multiplexer takes the two bytes of the 16-bit
bus and routes them to their required positions. Positioning of bytes is determined by
the size and address outputs. SIZ1 and SIZ0 indicate the remaining number of bytes
to be transferred during the current bus cycle. The number of bytes transferred is equal
to or less than the size indicated by SIZ1 and SIZ0, depending on port width.
ADDR0 also affects the operation of the data multiplexer. During an operand transfer,
ADDR[23:1] indicate the word base address of the portion of the operand to be ac-
cessed, and ADDR0 indicates the byte offset from the base.
Table 4-12 Effect of DSACK Signals
DSACK1 DSACK0 Result
1 1 Insert Wait States in Current Bus Cycle
1 0 Complete Cycle — Data Bus Port Size is 8 Bits
0 1 Complete Cycle — Data Bus Port Size is 16 Bits
0 0 Reserved
Operand Byte Order
31 24 23 16 15 8 7 0
Long Word OP0 OP1 OP2 OP3
Three Byte OP0 OP1 OP2
Word OP0 OP1
Byte OP0
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SYSTEM INTEGRATION MODULE MC68332
4-22 USER’S MANUAL
4.4.4 Misaligned Operands
CPU32 architecture uses a basic operand size of 16 bits. An operand is misaligned
when it overlaps a word boundary. This is determined by the value of ADDR0. When
ADDR0 = 0 (an even address), the address is on a word and byte boundary. When
ADDR0 = 1 (an odd address), the address is on a byte boundary only. A byte operand
is aligned at any address; a word or long-word operand is misaligned at an odd ad-
dress.
The largest amount of data that can be transferred by a single bus cycle is an aligned
word. If the MCU transfers a long-word operand through a 16-bit port, the most signif-
icant operand word is transferred on the first bus cycle and the least significant oper-
and word is transferred on a following bus cycle.
4.4.5 Operand Transfer Cases
Table 4-13 is a summary of how operands are aligned for various types of transfers.
OPn entries are portions of a requested operand that are read or written during a bus
cycle and are defined by SIZ1, SIZ0, and ADDR0 for that bus cycle. The following
paragraphs discuss all the allowable transfer cases in detail.
4.5 Bus Operation
Internal microcontroller modules are typically accessed in two system clock cycles,
with no wait states. Regular external bus cycles use handshaking between the MCU
and external peripherals to manage transfer size and data. These accesses take three
system clock cycles, again with no wait states. During regular cycles, wait states can
be inserted as needed by bus control logic. Refer to 4.5.2 Regular Bus Cycles for
more information.
NOTES:
1. The CPU32 does not support misaligned transfers.
2. Three-byte transfer cases occur only as a result of a long word to byte transfer.
Table 4-13 Operand Transfer Cases
Read Cycles Write Cycles
Nu
mTransfer Case SIZ
[1:0] ADDR0 DSACK
[1:0] DATA
[15:8] DATA
[7:0] DATA
[15:8] DATA
[7:0] Next
Cycle
1 Byte to 8-Bit Port (Even/Odd) 01 X 10 OP0 — OP0 (OP0) —
2 Byte to 16-Bit Port (Even) 01 0 01 OP0 — OP0 (OP0) —
3 Byte to 16-Bit Port (Odd) 01 1 01 — OP0 (OP0) OP0 —
4 Word to 8-Bit Port (Aligned) 10 0 10 OP0 — OP0 (OP1) 1
5 Word to 8-Bit Port (Misaligned)110 1 10 OP0 — OP0 (OP0) 1
6 Word to 16-Bit Port (Aligned) 10 0 11 OP0 OP1 OP0 OP1 —
7 Word to 16-Bit Port (Misaligned)110 1 01 — OP0 (OP0) OP0 2
8 Long Word to 8-Bit Port (Aligned) 00 0 10 OP0 — OP0 (OP1) 13
9 Long Word to 8-Bit Port (Misaligned)110 1 10 OP0 — OP0 (OP0) 12
10 Long Word to 16-Bit Port (Aligned) 00 0 01 OP0 OP1 OP0 OP1 6
11 Long Word to 16-Bit Port
(Misaligned)110 1 01 — OP0 (OP0) OP0 2
12 3 Byte to 8-Bit Port (Aligned)211 0 10 OP0 — OP0 (OP1) 5
13 3 Byte to 8-Bit Port (Misaligned)211 1 10 OP0 — OP0 (OP0) 4
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MC68332 SYSTEM INTEGRATION MODULE
USER’S MANUAL 4-23
Fast-termination cycles, which are two-cycle external accesses with no wait states,
use chip-select logic to generate handshaking signals internally. Chip-select logic can
also be used to insert wait states before internal generation of handshaking signals.
Refer to 4.5.3 Fast Termination Cycles and 4.8 Chip Selects for more information.
Bus control signal timing, as well as chip-select signal timing, are specified in APPEN-
DIX A ELECTRICAL CHARACTERISTICS. Refer to the
SIM Reference Manual
(SIM-
RM/AD) for more information about each type of bus cycle.
The MCU is responsible for de-skewing signals it issues at both the start and the end
of a cycle. In addition, the MCU is responsible for de-skewing acknowledge and data
signals from peripheral devices.
4.5.1 Synchronization to CLKOUT
External devices connected to the MCU bus can operate at a clock frequency different
from the frequencies of the MCU as long as the external devices satisfy the interface
signal timing constraints. Although bus cycles are classified as asynchronous, they are
interpreted relative to the MCU system clock output (CLKOUT).
Descriptions are made in terms of individual system clock states, labeled {S0, S1,
S2,..., SN}. The designation “state” refers to the logic level of the clock signal, and
does not correspond to any implemented machine state. A clock cycle consists of two
successive states. Refer to APPENDIX A ELECTRICAL CHARACTERISTICS for
more information.
Bus cycles terminated by DSACK assertion normally require a minimum of three CLK-
OUT cycles. To support systems that use CLKOUT to generate DSACK and other in-
puts, asynchronous input setup time and asynchronous input hold times are specified.
When these specifications are met, the MCU is guaranteed to recognize the appropri-
ate signal on a specific edge of the CLKOUT signal.
For a read cycle, when assertion of DSACK is recognized on a particular falling edge
of the clock, valid data is latched into the MCU on the next falling clock edge, provided
that the data meets the data setup time. In this case, the parameter for asynchronous
operation can be ignored.
When a system asserts DSACK for the required window around the falling edge of S2
and obeys the bus protocol by maintaining DSACK and BERR or HALT until and
throughout the clock edge that negates AS, no wait states are inserted. The bus cycle
runs at the maximum speed of three clocks per cycle.
To ensure proper operation in a system synchronized to CLKOUT, when either BERR,
or BERR and HALT is asserted after DSACK, BERR (or BERR and HALT) assertion
must satisfy the appropriate data-in setup and hold times before the falling edge of the
clock cycle after DSACK is recognized.
4.5.2 Regular Bus Cycles
The following paragraphs contain a discussion of cycles that use external bus control
logic. Refer to 4.5.3 Fast Termination Cycles for information about fast cycles.
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SYSTEM INTEGRATION MODULE MC68332
4-24 USER’S MANUAL
To initiate a transfer, the MCU asserts an address and the SIZ[1:0] signals. The SIZ
signals and ADDR0 are externally decoded to select the active portion of the data bus
(refer to 4.4.2 Dynamic Bus Sizing). When AS, DS, and R/W are valid, a peripheral
device either places data on the bus (read cycle) or latches data from the bus (write
cycle), then asserts a DSACK[1:0] combination that indicates port size.
The DSACK[1:0] signals can be asserted before the data from a peripheral device is
valid on a read cycle. To ensure valid data is latched into the MCU, a maximum period
between DSACK assertion and DS assertion is specified.
There is no specified maximum for the period between the assertion of AS and
DSACK. Although the MCU can transfer data in a minimum of three clock cycles when
the cycle is terminated with DSACK, the MCU inserts wait cycles in clock period incre-
ments until either DSACK signal goes low.
NOTE
The SIM bus monitor asserts BERR when response time exceeds a
predetermined limit. Bus monitor period is determined by the BMT
field in SYPCR. The bus monitor cannot be disabled; maximum mon-
itor period is 64 system clock cycles.
If no peripheral responds to an access, or if an access is invalid, external logic should
assert the BERR or HALT signals to abort the bus cycle (when BERR and HALT are
asserted simultaneously, the CPU32 acts as though only BERR is asserted). If bus ter-
mination signals are not asserted within a specified period, the bus monitor terminates
the cycle.
4.5.2.1 Read Cycle
During a read cycle, the MCU transfers data from an external memory or peripheral
device. If the instruction specifies a long-word or word operation, the MCU attempts to
read two bytes at once. For a byte operation, the MCU reads one byte. The portion of
the data bus from which each byte is read depends on operand size, peripheral ad-
dress, and peripheral port size. Figure 4-9 is a flowchart of a word read cycle. Refer
to 4.4.2 Dynamic Bus Sizing, 4.4.4 Misaligned Operands, and the
SIM Reference
Manual
(SIMRM/AD) for more information.
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MC68332 SYSTEM INTEGRATION MODULE
USER’S MANUAL 4-25
Figure 4-9 Word Read Cycle Flowchart
4.5.2.2 Write Cycle
During a write cycle, the MCU transfers data to an external memory or peripheral de-
vice. If the instruction specifies a long-word or word operation, the MCU attempts to
write two bytes at once. For a byte operation, the MCU writes one byte. The portion of
the data bus upon which each byte is written depends on operand size, peripheral ad-
dress, and peripheral port size.
Refer to 4.4.2 Dynamic Bus Sizing and 4.4.4 Misaligned Operands for more infor-
mation. Figure 4-10 is a flowchart of a write-cycle operation for a word transfer. Refer
to the
SIM Reference Manual
(SIMRM/AD) for more information.
RD CYC FLOW
MCU PERIPHERAL
ADDRESS DEVICE (S0)
1) SET R/W TO READ
2) DRIVE ADDRESS ON ADDR[23:0]
3) DRIVE FUNCTION CODE ON FC[2:0]
4) DRIVE SIZ[1:0] FOR OPERAND SIZE
START NEXT CYCLE (S0)
1) DECODE ADDR, R/W, SIZ[1:0], DS
2) PLACE DATA ON DATA[15:0] OR
DATA[15:8] IF 8-BIT DATA
PRESENT DATA (S2)
3) DRIVE DSACK SIGNALS
TERMINATE CYCLE (S5)
1) REMOVE DATA FROM DATA BUS
2) NEGATE DSACK
ASSERT AS AND DS (S1)
DECODE DSACK (S3)
LATCH DATA (S4)
NEGATE AS AND DS (S5)
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SYSTEM INTEGRATION MODULE MC68332
4-26 USER’S MANUAL
Figure 4-10 Write Cycle Flowchart
4.5.3 Fast Termination Cycles
When an external device has a fast access time, the chip-select circuit fast-termination
option can provide a two-cycle external bus transfer. Because the chip-select circuits
are driven from the system clock, the bus cycle termination is inherently synchronized
with the system clock.
If multiple chip selects are to be used to select the same device that can support fast
termination, and match conditions can occur simultaneously, program the DSACK
field in each associated chip-select option register for fast termination. Alternately, pro-
gram one DSACK field for fast termination and the remaining DSACK fields for exter-
nal termination.
Fast termination cycles use internal handshaking signals generated by the chip-select
logic. To initiate a transfer, the MCU asserts an address and the SIZ[1:0] signals.
WR CYC FLOW
MCU PERIPHERAL
ADDRESS DEVICE (S0)
1) DECODE ADDRESS
2) LATCH DATA FROM DATA BUS
ACCEPT DATA (S2 + S3)
3) ASSERT DSACK SIGNALS
TERMINATE CYCLE
1) SET R/W TO WRITE
2) DRIVE ADDRESS ON ADDR[23:0]
3) DRIVE FUNCTION CODE ON FC[2:0]
4) DRIVE SIZ[1:0] FOR OPERAND SIZE
1) NEGATE DS AND AS
2) REMOVE DATA FROM DATA BUS
TERMINATE OUTPUT TRANSFER (S5)
START NEXT CYCLE
ASSERT AS (S1)
PLACE DATA ON DATA[15:0] (S2)
ASSERT DS AND WAIT FOR DSACK (S3)
OPTIONAL STATE (S4)
NO CHANGE
1) NEGATE DSACK
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MC68332 SYSTEM INTEGRATION MODULE
USER’S MANUAL 4-27
When AS, DS, and R/W are valid, a peripheral device either places data on the bus
(read cycle) or latches data from the bus (write cycle). At the appropriate time, chip-
select logic asserts data and size acknowledge signals.
The DSACK option fields in the chip-select option registers determine whether inter-
nally generated DSACK or externally generated DSACK are used. For fast termination
cycles, the F-term encoding (%1110) must be used. Refer to 4.8.1 Chip-Select Reg-
isters for information about fast-termination setup.
To use fast-termination, an external device must be fast enough to have data ready,
within the specified setup time, by the falling edge of S4. Refer to APPENDIX A ELEC-
TRICAL CHARACTERISTICS for tabular information about fast termination timing.
When fast termination is in use, DS is asserted during read cycles but not during write
cycles. The STRB field in the chip-select option register used must be programmed
with the address strobe encoding to assert the chip select signal for a fast-termination
write.
4.5.4 CPU Space Cycles
Function code signals FC[2:0] designate which of eight external address spaces is ac-
cessed during a bus cycle. Address space 7 is designated CPU space. CPU space is
used for control information not normally associated with read or write bus cycles.
Function codes are valid only while AS is asserted. Refer to 4.4.1.7 Function Codes
for more information on codes and encoding.
During a CPU space access, ADDR[19:16] are encoded to reflect the type of access
being made. Figure 4-11 shows the three encodings used by 68300 family microcon-
trollers. These encodings represent breakpoint acknowledge (Type $0) cycles, low
power stop broadcast (Type $3) cycles, and interrupt acknowledge (Type $F) cycles.
Refer to 4.7 Interrupts for information about interrupt acknowledge bus cycles.
Figure 4-11 CPU Space Address Encoding
CPU SPACE CYC TIM
0000000000000000000 T0BKPT#
1923 16
000000111111111111111110
19 1623
111
111
11111111111111111111 1111 LEVEL
19 1623
CPU SPACE CYCLES
FUNCTION
CODE
20
20
20
0
0
0
CPU SPACE
TYPE FIELD
ADDRESS BUS
BREAKPOINT
ACKNOWLEDGE
LOW POWER
STOP BROADCAST
INTERRUPT
ACKNOWLEDGE
241
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SYSTEM INTEGRATION MODULE MC68332
4-28 USER’S MANUAL
4.5.4.1 Breakpoint Acknowledge Cycle
Breakpoints stop program execution at a predefined point during system development.
Breakpoints can be used alone or in conjunction with the background debugging
mode. The following paragraphs discuss breakpoint processing when background de-
bugging mode is not enabled. See SECTION 5 CENTRAL PROCESSING UNIT for
more information on exception processing and the background debugging mode.
In M68300 microcontrollers, both hardware and software can initiate breakpoints.
4.5.4.1.1 Software Breakpoints
The CPU32 BKPT instruction allows the user to insert breakpoints through software.
The CPU responds to this instruction by initiating a breakpoint-acknowledge read cy-
cle in CPU space. It places the breakpoint acknowledge (%0000) code on AD-
DR[19:16], the breakpoint number (bits [2:0] of the BKPT opcode) in ADDR[4:2], and
%0 (indicating a software breakpoint) on ADDR1.
The external breakpoint circuitry decodes the function code and address lines and re-
sponds by either asserting BERR or placing an instruction word on the data bus and
asserting DSACK.
If the bus cycle is terminated by DSACK, the CPU32 reads the instruction on the data
bus and inserts the instruction into the pipeline. (For 8-bit ports, this instruction fetch
may require two read cycles.)
If the bus cycle is terminated by BERR, the CPU32 then performs illegal-instruction
exception processing: it acquires the number of the illegal-instruction exception vector,
computes the vector address from this number, loads the content of the vector address
into the PC, and jumps to the exception handler routine at that address.
4.5.4.1.2 Hardware Breakpoints
Assertion of the BKPT input initiates a hardware breakpoint. The CPU responds by ini-
tiating a breakpoint-acknowledge read cycle in CPU space. It places $00001E on the
address bus. (The breakpoint acknowledge code of %0000 is placed on ADDR[19:16],
the breakpoint number value of %111 is placed on ADDR[4:2], and ADDR1 is set to
one, indicating a hardware breakpoint.)
The external breakpoint circuitry decodes the function code and address lines, places
an instruction word on the data bus, and asserts BERR. The CPU then performs hard-
ware breakpoint exception processing: it acquires the number of the hardware break-
point exception vector, computes the vector address from this number, loads the
content of the vector address into the PC, and jumps to the exception handler routine
at that address. If the external device asserts DSACK rather than BERR, the CPU ig-
nores the breakpoint and continues processing.
When BKPT assertion is synchronized with an instruction prefetch, processing of the
breakpoint exception occurs at the end of that instruction. The prefetched instruction
is “tagged” with the breakpoint when it enters the instruction pipeline, and the break-
point exception occurs after the instruction executes. If the pipeline is flushed before
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MC68332 SYSTEM INTEGRATION MODULE
USER’S MANUAL 4-29
the tagged instruction is executed, no breakpoint occurs. When BKPT assertion is syn-
chronized with an operand fetch, exception processing occurs at the end of the instruc-
tion during which BKPT is latched.
Refer to the
CPU32 Reference Manual
(CPU32RM/AD) and the
SIM Reference Man-
ual
(SIMRM/AD) for additional information.
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SYSTEM INTEGRATION MODULE MC68332
4-30 USER’S MANUAL
Figure 4-12 Breakpoint Operation Flowchart
IF BREAKPOINT INSTRUCTION EXECUTED:
1) SET R/W TO READ
2) SET FUNCTION CODE TO CPU SPACE
3) PLACE CPU SPACE TYPE 0 ON ADDR[19:16]
4) PLACE BREAKPOINT NUMBER ON ADDR[4:2]
5) CLEAR T-BIT (ADDR1) TO ZERO
6) SET SIZE TO WORD
7) ASSERT AS AND DS
IF BKPT PIN ASSERTED:
1) SET R/W TO READ
2) SET FUNCTION CODE TO CPU SPACE
3) PLACE CPU SPACE TYPE 0 ON ADDR[19:16]
4) PLACE ALL ONES ON ADDR[4:2]
5) SET T-BIT (ADDR1) TO ONE
6) SET SIZE TO WORD
7) ASSERT AS AND DS
ACKNOWLEDGE BREAKPOINT
IF BREAKPOINT INSTRUCTION EXECUTED AND
DSACK IS ASSERTED:
1) LATCH DATA
2) NEGATE AS AND DS
3) GO TO (A)
IF BKPT PIN ASSERTED AND
DSACK IS ASSERTED:
1) NEGATE AS AND DS
2) GO TO (A)
IF BERR ASSERTED:
1) NEGATE AS AND DS
2) GO TO (B)
(A) (B)
1) ASSERT BERR TO INITIATE EXCEPTION PROCESSING
IF BKPT INSTRUCTION EXECUTED:
1) PLACE LATCHED DATA IN INSTRUCTION PIPELINE
2) CONTINUE PROCESSING
IF BKPT PIN ASSERTED:
1) CONTINUE PROCESSING
IF BKPT INSTRUCTION EXECUTED:
1) INITIATE ILLEGAL INSTRUCTION PROCESSING
IF BKPT PIN ASSERTED:
1) INITIATE HARDWARE BREAKPOINT PROCESSING
1) NEGATE DSACK or BERR
BREAKPOINT OPERATION FLOW
CPU32 PERIPHERAL
IF BKPT ASSERTED:
1) ASSERT DSACK
OR:
1) ASSERT BERR TO INITIATE EXCEPTION PROCESSING
IF BKPT INSTRUCTION EXECUTED:
1) PLACE REPLACEMENT OPCODE ON DATA BUS
2) ASSERT DSACK
OR:
1110A
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MC68332 SYSTEM INTEGRATION MODULE
USER’S MANUAL 4-31
4.5.4.2 LPSTOP Broadcast Cycle
Low-power stop is initiated by the CPU32. Individual modules can be stopped by set-
ting the STOP bits in each module configuration register, or the SIM can turn off sys-
tem clocks after execution of the LPSTOP instruction. When the CPU executes
LPSTOP, the LPSTOP broadcast cycle is generated. The SIM brings the MCU out of
low-power mode when either an interrupt of higher priority than the stored mask or a
reset occurs. Refer to and SECTION 5 CENTRAL PROCESSING UNIT for more in-
formation.
During an LPSTOP broadcast cycle, the CPU performs a CPU space write to address
$3FFFE. This write puts a copy of the interrupt mask value in the clock control logic.
The mask is encoded on the data bus as shown in Figure 4-13. The LPSTOP CPU
space cycle is shown externally (if the bus is available) as an indication to external de-
vices that the MCU is going into low-power stop mode. The SIM provides an internally
generated DSACK response to this cycle. The timing of this bus cycle is the same as
for a fast write cycle.
Figure 4-13 LPSTOP Interrupt Mask Level
4.5.5 Bus Exception Control Cycles
An external device or a chip-select circuit must assert at least one of the DSACK[1:0]
signals or the AVEC signal to terminate a bus cycle normally. Bus error processing oc-
curs when bus cycles are not terminated in the expected manner. The internal bus
monitor can be used to generate BERR internally, causing a bus error exception to be
taken. Bus cycles can also be terminated by assertion of the external BERR or HALT
signal, or by assertion of the two signals simultaneously.
Acceptable bus cycle termination sequences are summarized as follows. The case
numbers refer to Table 4-5, which indicates the results of each type of bus cycle ter-
mination.
Normal Termination
DSACK is asserted; BERR and HALT remain negated (case 1).
Halt Termination
HALT is asserted at the same time or before DSACK, and BERR remains negated
(case 2).
Bus Error Termination
BERR is asserted in lieu of, at the same time as, or before DSACK, or after
DSACK, and HALT remains negated; BERR is negated at the same time or after
DSACK.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 0 0 0 0 0 0 0 0 0 0 0 0 IP MASK
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SYSTEM INTEGRATION MODULE MC68332
4-32 USER’S MANUAL
Retry Termination
HALT and BERR are asserted in lieu of, at the same time as, or before DSACK or
after DSACK; BERR is negated at the same time or after DSACK; HALT may be
negated at the same time or after BERR.
Table 4-14 shows various combinations of control signal sequences and the resulting
bus cycle terminations.
NOTES:
N = The number of current even bus state (S2, S4, etc.).
A = Signal is asserted in this bus state.
NA = Signal is not asserted in this state
X = Don't care.
S = Signal was asserted in previous state and remains asserted in this state.
To properly control termination of a bus cycle for a retry or a bus error condition,
DSACK, BERR, and HALT must be asserted and negated with the rising edge of the
MCU clock. This ensures that when two signals are asserted simultaneously, the re-
quired setup time and hold time for both of them are met for the same falling edge of
the MCU clock. (Refer to APPENDIX A ELECTRICAL CHARACTERISTICS for timing
requirements.) External circuitry that provides these signals must be designed with
these constraints in mind, or else the internal bus monitor must be used.
DSACK, BERR, and HALT may be negated after AS is negated.
WARNING
If DSACK or BERR remain asserted into S2 of the next bus cycle,
that cycle may be terminated prematurely.
Table 4-14 DSACK, BERR, and HALT Assertion Results
Case
Number Control Signal Asserted on Rising
Edge of State Result
N N + 2
1 DSACK
BERR
HALT
A
NA
NA
S
NA
X
Normal termination.
2 DSACK
BERR
HALT
A
NA
A/S
S
NA
S
Halt termination: normal cycle terminate and halt.
Continue when HALT is negated.
3 DSACK
BERR
HALT
NA/A
A
NA
X
S
X
Bus error termination: terminate and take bus error
exception, possibly deferred.
4 DSACK
BERR
HALT
A
A
NA
X
S
NA
Bus error termination: terminate and take bus error
exception, possibly deferred.
5 DSACK
BERR
HALT
NA/A
A
A/S
X
S
S
Retry termination: terminate and retry when HALT is
negated.
6 DSACK
BERR
HALT
A
NA
NA
X
A
A
Retry termination: terminate and retry when HALT is
negated.
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MC68332 SYSTEM INTEGRATION MODULE
USER’S MANUAL 4-33
4.5.5.1 Bus Errors
The CPU32 treats bus errors as a type of exception. Bus error exception processing
begins when the CPU detects assertion of the IMB BERR signal (by the internal bus
monitor or an external source) while the HALT signal remains negated.
BERR assertions do not force immediate exception processing. The signal is synchro-
nized with normal bus cycles and is latched into the CPU32 at the end of the bus cycle
in which it was asserted. Because bus cycles can overlap instruction boundaries, bus
error exception processing may not occur at the end of the instruction in which the bus
cycle begins. Timing of BERR detection/acknowledge is dependent upon several fac-
tors:
• Which bus cycle of an instruction is terminated by assertion of BERR.
• The number of bus cycles in the instruction during which BERR is asserted.
• The number of bus cycles in the instruction following the instruction in which
BERR is asserted.
• Whether BERR is asserted during a program space access or a data space ac-
cess.
Because of these factors, it is impossible to predict precisely how long after occur-
rence of a bus error the bus error exception is processed.
CAUTION
The external bus interface does not latch data when an external bus
cycle is terminated by a bus error. When this occurs during an in-
struction prefetch, the IMB precharge state (bus pulled high, or $FF)
is latched into the CPU32 instruction register, with indeterminate re-
sults.
4.5.5.2 Double Bus Faults
Exception processing for bus error exceptions follows the standard exception process-
ing sequence. Refer to SECTION 5 CENTRAL PROCESSING UNIT for more informa-
tion about exceptions. However, a special case of bus error, called double bus fault,
can abort exception processing.
BERR assertion is not detected until an instruction is complete. The BERR latch is
cleared by the first instruction of the BERR exception handler. Double bus fault occurs
in two ways:
1. When bus error exception processing begins and a second BERR is detected
before the first instruction of the first exception handler is executed.
2. When one or more bus errors occur before the first instruction after a RESET
exception is executed.
3. A bus error occurs while the CPU32 is loading information from a bus error
stack frame during a return from exception (RTE) instruction.
Multiple bus errors within a single instruction that can generate multiple bus cycles
cause a single bus error exception after the instruction has been executed.
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Immediately after assertion of a second BERR, the MCU halts and drives the HALT
line low. Only a reset can restart a halted MCU. However, bus arbitration can still occur
(refer to 4.5.6 External Bus Arbitration). A bus error or address error that occurs after
exception processing has been completed (during the execution of the exception han-
dler routine, or later) does not cause a double bus fault. The MCU continues to retry
the same bus cycle as long as the external hardware requests it.
4.5.5.3 Retry Operation
When an external device asserts BERR and HALT during a bus cycle, the MCU enters
the retry sequence. A delayed retry can also occur. The MCU terminates the bus cycle,
places the AS and DS signals in their inactive state, and does not begin another bus
cycle until the BERR and HALT signals are negated by external logic. After a synchro-
nization delay, the MCU retries the previous cycle using the same address, function
codes, data (for a write), and control signals. The BERR signal should be negated be-
fore S2 of the read cycle to ensure correct operation of the retried cycle.
If BR, BERR, and HALT are all asserted on the same cycle, the EBI will enter the rerun
sequence but first relinquishes the bus to an external master. Once the external mas-
ter returns the bus and negates BERR and HALT, the EBI runs the previous bus cycle.
This feature allows an external device to correct the problem that caused the bus error
and then try the bus cycle again.
The MCU retries any read or write cycle of an indivisible read-modify-write operation
separately; RMC remains asserted during the entire retry sequence. The MCU will not
relinquish the bus while RMC is asserted. Any device that requires the MCU to give up
the bus and retry a bus cycle during a read-modify-write cycle must assert BERR and
BR only (HALT must remain negated). The bus error handler software should examine
the read-modify-write bit in the special status word and take the appropriate action to
resolve this type of fault when it occurs.
4.5.5.4 Halt Operation
When HALT is asserted while BERR is not asserted, the MCU halts external bus ac-
tivity after negation of DSACK. The MCU may complete the current word transfer in
progress. For a long-word to byte transfer, this could be after S2 or S4. For a word to
byte transfer, activity ceases after S2.
Negating and reasserting HALT according to timing requirements provides single-step
(bus cycle to bus cycle) operation. The HALT signal affects external bus cycles only,
so that a program that does not use external bus can continue executing. During dy-
namically-sized 8-bit transfers, external bus activity may not stop at the next cycle
boundary. Occurrence of a bus error while HALT is asserted causes the CPU32 to ini-
tiate a retry sequence.
When the MCU completes a bus cycle while the HALT signal is asserted, the data bus
goes to high-impedance state and the AS and DS signals are driven to their inactive
states. Address, function code, size, and read/write signals remain in the same state.
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The halt operation has no effect on bus arbitration (refer to 4.5.6 External Bus Arbi-
tration). However, when external bus arbitration occurs while the MCU is halted, ad-
dress and control signals go to high-impedance state. If HALT is still asserted when
the MCU regains control of the bus, address, function code, size, and read/write sig-
nals revert to the previous driven states. The MCU cannot service interrupt requests
while halted.
4.5.6 External Bus Arbitration
MCU bus design provides for a single bus master at any one time. Either the MCU or
an external device can be master. Bus arbitration protocols determine when an exter-
nal device can become bus master. Bus arbitration requests are recognized during
normal processing, HALT assertion, and when the CPU has halted due to a double
bus fault.
The bus controller in the MCU manages bus arbitration signals so that the MCU has
the lowest priority. External devices that need to obtain the bus must assert bus arbi-
tration signals in the sequences described in the following paragraphs.
Systems that include several devices that can become bus master require external cir-
cuitry to assign priorities to the devices, so that when two or more external devices at-
tempt to become bus master at the same time, the one having the highest priority
becomes bus master first. The protocol sequence is:
A. An external device asserts bus request signal (BR);
B. The MCU asserts the bus grant signal (BG) to indicate that the bus is available;
C. An external device asserts the bus grant acknowledge (BGACK) signal to indi-
cate that it has assumed bus mastership.
BR can be asserted during a bus cycle or between cycles. BG is asserted in response
to BR. To guarantee operand coherency, BG is only asserted at the end of operand
transfer. Additionally, BG is not asserted until the end of an indivisible read-modify-
write operation (when RMC is negated).
If more than one external device can be bus master, required external arbitration must
begin when a requesting device receives BG. An external device must assert BGACK
when it assumes mastership, and must maintain BGACK assertion as long as it is bus
master.
Two conditions must be met for an external device to assume bus mastership. The de-
vice must receive BG through the arbitration process, and BGACK must be inactive,
indicating that no other bus master is active. This technique allows the processing of
bus requests during data transfer cycles.
BG is negated a few clock cycles after BGACK transition. However, if bus requests are
still pending after BG is negated, the MCU asserts BG again within a few clock cycles.
This additional BG assertion allows external arbitration circuitry to select the next bus
master before the current master has released the bus.
Refer to Figure 4-14, which shows bus arbitration for a single device. The flowchart
shows BR negated at the same time BGACK is asserted.
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SYSTEM INTEGRATION MODULE MC68332
4-36 USER’S MANUAL
Figure 4-14 Bus Arbitration Flowchart for Single Request
State changes occur on the next rising edge of CLKOUT after the internal signal is val-
id. The BG signal transitions on the falling edge of the clock after a state is reached
during which G changes. The bus control signals (controlled by T) are driven by the
MCU immediately following a state change, when bus mastership is returned to the
MCU. State 0, in which G and T are both negated, is the state of the bus arbiter while
the MCU is bus master. Request R and acknowledge A keep the arbiter in state 0 as
long as they are both negated.
4.5.6.1 Slave (Factory Test) Mode Arbitration
This mode is used for factory production testing of internal modules. It is not supported
as a user operating mode. Slave mode is enabled by holding DATA11 low during re-
set. In slave mode, when BG is asserted, the MCU is slaved to an external master that
has full access to all internal registers.
4.5.6.2 Show Cycles
The MCU normally performs internal data transfers without affecting the external bus,
but it is possible to show these transfers during debugging. AS is not asserted exter-
nally during show cycles.
GRANT BUS ARBITRATION
1) ASSERT BUS GRANT (BG)
TERMINATE ARBITRATION
1) NEGATE BG (AND WAIT FOR
BGACK TO BE NEGATED)
RE-ARBITRATE OR RESUME PROCESSOR
OPERATION
MCU REQUESTING DEVICE
REQUEST THE BUS
1) ASSERT BUS REQUEST (BR)
ACKNOWLEDGE BUS MASTERSHIP
1) EXTERNAL ARBITRATION DETERMINES
NEXT BUS MASTER
2) NEXT BUS MASTER WAITS FOR BGACK
TO BE NEGATED
3) NEXT BUS MASTER ASSERTS BGACK
TO BECOME NEW MASTER
4) BUS MASTER NEGATES BR
OPERATE AS BUS MASTER
1) PERFORM DATA TRANSFERS (READ AND
WRITE CYCLES) ACCORDING TO THE
SAME RULES THE PROCESSOR USES
RELEASE BUS MASTERSHIP
1) NEGATE BGACK
BUS ARB FLOW
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USER’S MANUAL 4-37
Show cycles are controlled by the SHEN field in the SIMCR (refer to 4.2.3 Show In-
ternal Cycles). This field is cleared by reset. When show cycles are disabled, the
address bus, function codes, size, and read/write signals reflect internal bus activity,
but AS and DS are not asserted externally and external data bus pins are in high-im-
pedance state during internal accesses.
When show cycles are enabled, DS is asserted externally during internal cycles, and
internal data is driven out on the external data bus. Because internal cycles normally
continue to run when the external bus is granted, one SHEN encoding halts internal
bus activity while there is an external master.
SIZ[1:0] signals reflect bus allocation during show cycles. Only the appropriate portion
of the data bus is valid during the cycle. During a byte write to an internal address, the
portion of the bus that represents the byte that is not written reflects internal bus con-
ditions, and is indeterminate. During a byte write to an external address, the data mul-
tiplexer in the SIM causes the value of the byte that is written to be driven out on both
bytes of the data bus.
4.6 Reset
Reset occurs when an active low logic level on the RESET pin is clocked into the SIM.
The RESET input is synchronized to the system clock. If there is no clock when RE-
SET is asserted, reset does not occur until the clock starts. Resets are clocked to allow
completion of write cycles in progress at the time RESET is asserted.
Reset procedures handle system initialization and recovery from catastrophic failure.
The MCU performs resets with a combination of hardware and software. The system
integration module determines whether a reset is valid, asserts control signals, per-
forms basic system configuration and boot ROM selection based on hardware mode-
select inputs, then passes control to the CPU32.
4.6.1 Reset Exception Processing
The CPU32 processes resets as a type of asynchronous exception. An exception is
an event that preempts normal processing, and can be caused by internal or external
events. Exception processing makes the transition from normal instruction execution
to execution of a routine that deals with an exception. Each exception has an assigned
vector that points to an associated handler routine. These vectors are stored in the
vector base register (VBR). The VBR contains the base address of a 1024-byte excep-
tion vector table, which consists of 256 exception vectors. The CPU32 uses vector
numbers to calculate displacement into the table. Refer to SECTION 5 CENTRAL
PROCESSING UNIT for more information concerning exceptions.
Reset is the highest-priority CPU32 exception. Unlike all other exceptions, a reset oc-
curs at the end of a bus cycle, and not at an instruction boundary. Handling resets in
this way prevents write cycles in progress at the time the reset signal is asserted from
being corrupted. However, any processing in progress is aborted by the reset excep-
tion, and cannot be restarted. Only essential reset tasks are performed during excep-
tion processing. Other initialization tasks must be accomplished by the exception
handler routine. 4.6.8 Reset Processing Summary contains details of exception pro-
cessing.
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SYSTEM INTEGRATION MODULE MC68332
4-38 USER’S MANUAL
4.6.2 Reset Control Logic
SIM reset control logic determines the cause of a reset, synchronizes reset assertion
if necessary to the completion of the current bus cycle, and asserts the appropriate re-
set lines. Reset control logic can drive four different internal signals.
1. EXTRST (external reset) drives the external reset pin.
2. CLKRST (clock reset) resets the clock module.
3. MSTRST (master reset) goes to all other internal circuits.
4. SYSRST (system reset) indicates to internal circuits that the CPU has executed
a RESET instruction.
All resets are gated by CLKOUT. Resets are classified as synchronous or asynchro-
nous. An asynchronous reset can occur on any CLKOUT edge. Reset sources that
cause an asynchronous reset usually indicate a catastrophic failure; thus the reset
control logic responds by asserting reset to the system immediately. (A system reset,
however, caused by the CPU32 RESET instruction, is asynchronous but does not in-
dicate any type of catastrophic failure).
Synchronous resets are timed (CLKOUT) to occur at the end of bus cycles. The inter-
nal bus monitor is automatically enabled for synchronous resets. When a bus cycle
does not terminate normally, the bus monitor terminates it.
Refer to Table 4-15 for a summary of reset sources.
Internal single byte or aligned word writes are guaranteed valid for synchronous re-
sets. External writes are also guaranteed to complete, provided the external configu-
ration logic on the data bus is conditioned as shown in Figure 4-13.
4.6.3 Reset Mode Selection
The logic states of certain data bus pins during reset determine SIM operating config-
uration. In addition, the state of the MODCLK pin determines system clock source and
the state of the BKPT pin determines what happens during subsequent breakpoint as-
sertions. Table 4-16 is a summary of reset mode selection options.
Table 4-15 Reset Source Summary
Type Source Timing Cause Reset Lines Asserted by
Controller
External External Synch External Signal MSTRST CLKRST EXTRST
Power Up EBI Asynch VDD MSTRST CLKRST EXTRST
Software Watchdog Monitor Asynch Time Out MSTRST CLKRST EXTRST
HALT Monitor Asynch Internal HALT Assertion
(e.g. Double Bus Fault)
MSTRST CLKRST EXTRST
Loss of Clock Clock Synch Loss of Reference MSTRST CLKRST EXTRST
Test Test Synch Test Mode MSTRST — EXTRST
System CPU32 Asynch RESET Instruction — — EXTRST
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MC68332 SYSTEM INTEGRATION MODULE
USER’S MANUAL 4-39
4.6.3.1 Data Bus Mode Selection
All data lines have weak internal pull-up drivers. When pins are held high by the inter-
nal drivers, the MCU uses a default operating configuration. However, specific lines
can be held low externally to achieve an alternate configuration.
NOTE
External bus loading can overcome the weak internal pull-up drivers
on data bus lines, and hold pins low during reset.
Use an active device to hold data bus lines low. Data bus configuration logic must re-
lease the bus before the first bus cycle after reset to prevent conflict with external
memory devices. The first bus cycle occurs ten CLKOUT cycles after RESET is re-
leased. If external mode selection logic causes a conflict of this type, an isolation re-
sistor on the driven lines may be required. Figure 4-15 shows a recommended method
for conditioning the mode select signals.
Table 4-16 Reset Mode Selection
Mode Select Pin Default Function
(Pin Left High) Alternate Function
(Pin Pulled Low)
DATA0 CSBOOT 16-Bit CSBOOT 8-Bit
DATA1 CS0
CS1
CS2
BR
BG
BGACK
DATA2 CS3
CS4
CS5
FC0
FC1
FC2
DATA3
DATA4
DATA5
DATA6
DATA7
CS6
CS[7:6]
CS[8:6]
CS[9:6]
CS[10:6]
ADDR19
ADDR[20:19]
ADDR[21:19]
ADDR[22:19]
ADDR[23:19]
DATA8 DSACK[1:0],
AVEC, DS, AS,
SIZE
PORTE
DATA9 IRQ[7:1]
MODCLK
PORTF
DATA11 Test Mode Disabled Test Mode Enabled
MODCLK VCO = System Clock EXTAL = System Clock
BKPT Background Mode Disabled Background Mode Enabled
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SYSTEM INTEGRATION MODULE MC68332
4-40 USER’S MANUAL
Figure 4-15 Data Bus Mode Select Conditioning
Data bus mode select current is specified in APPENDIX A ELECTRICAL CHARAC-
TERISTICS. Do not confuse pin function with pin electrical state. Refer to 4.6.5 Pin
State During Reset for more information.
DATA0 determines the function of the boot ROM chip-select signal (CSBOOT). Unlike
other chip-select signals, CSBOOT is active at the release of reset. During reset ex-
ception processing, the MCU fetches initialization vectors beginning at address
$000000 in supervisor program space. An external memory device containing vectors
located at these addresses can be enabled by CSBOOT after a reset. The logic level
of DATA0 during reset selects boot ROM port size for dynamic bus allocation. When
DATA0 is held low, port size is eight bits; when DATA0 is held high, either by the weak
internal pull-up driver or by an external pull-up, port size is 16 bits. Refer to 4.8.4 Chip-
Select Reset Operation for more information.
DATA1 and DATA2 determine the functions of CS[2:0] and CS[5:3], respectively. DA-
TA[7:3] determine the functions of an associated chip select and all lower-numbered
chip-selects down through CS6. For example, if DATA5 is pulled low during reset,
CS[8:6] are assigned alternate function as ADDR[21:19], and CS[10:9] remain chip-
selects. Refer to 4.8.4 Chip-Select Reset Operation for more information.
DATA8 determines the function of the DSACK[1:0], AVEC, DS, AS, and SIZE pins. If
DATA8 is held low during reset, these pins are assigned to I/O port E.
DATA9 determines the function of interrupt request pins IRQ[7:0] and the clock mode
select pin (MODCLK). When DATA9 is held low during reset, these pins are assigned
to I/O port F.
DATA11 determines whether the SIM operates in test mode out of reset. This capabil-
ity is used for factory testing of the MCU.
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
DATA BUS MODE DECODE
RESET
R/W
MODE SELECT
LINES
DS
VDD VDD
DATA15
DATA1
DATA0
* * *
*Optional, to prevent conflict on RESET negation.
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USER’S MANUAL 4-41
4.6.3.2 Clock Mode Selection
The state of the clock mode (MODCLK) pin during reset determines what clock source
the MCU uses. When MODCLK is held high during reset, the clock signal is generated
from a reference frequency. When MODCLK is held low during reset, the clock syn-
thesizer is disabled, and an external system clock signal must be applied. Refer to 4.3
System Clock for more information.
NOTE
The MODCLK pin can also be used as parallel I/O pin PF0. To pre-
vent inadvertent clock mode selection by logic connected to port F,
use an active device to drive MODCLK during reset.
4.6.3.3 Breakpoint Mode Selection
The MCU uses internal and external breakpoint (BKPT) signals. During reset excep-
tion processing, at the release of the RESET signal, the CPU32 samples these signals
to determine how to handle breakpoints.
If either BKPT signal is at logic level zero when sampled, an internal BDM flag is set,
and the CPU32 enters background debugging mode whenever either BKPT input is
subsequently asserted.
If both BKPT inputs are at logic level one when sampled, breakpoint exception pro-
cessing begins whenever either BKPT signal is subsequently asserted.
Refer to SECTION 5 CENTRAL PROCESSING UNIT for more information on back-
ground debugging mode and exceptions. Refer to 4.5.4 CPU Space Cycles for infor-
mation concerning breakpoint acknowledge bus cycles.
4.6.4 MCU Module Pin Function During Reset
Usually, module pins default to port functions, and input/output ports are set to input
state. This is accomplished by disabling pin functions in the appropriate control regis-
ters, and by clearing the appropriate port data direction registers. Refer to individual
module sections in this manual for more information. Table 4-17 is a summary of mod-
ule pin function out of reset. Refer to APPENDIX D REGISTER SUMMARY for register
function and reset state.
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SYSTEM INTEGRATION MODULE MC68332
4-42 USER’S MANUAL
4.6.5 Pin State During Reset
It is important to keep the distinction between pin function and pin electrical state clear.
Although control register values and mode select inputs determine pin function, a pin
driver can be active, inactive or in high-impedance state while reset occurs. During
power-up reset, pin state is subject to the constraints discussed in 4.6.7 Power-On
Reset.
NOTE
Pins that are not used should either be configured as outputs, or (if
configured as inputs) pulled to the appropriate inactive state. This de-
creases additional IDD caused by digital inputs floating near mid-sup-
ply level.
4.6.5.1 Reset States of SIM Pins
Generally, while RESET is asserted, SIM pins either go to an inactive high-impedance
state or are driven to their inactive states. After RESET is released, mode selection
occurs, and reset exception processing begins. Pins configured as inputs during reset
become active high-impedance loads after RESET is released. Inputs must be driven
to the desired active state. Pull-up or pull-down circuitry may be necessary. Pins con-
figured as outputs begin to function after RESET is released. Table 4-18 is a summary
of SIM pin states during reset.
Table 4-17 Module Pin Functions
Module Pin Mnemonic Function
CPU32 DSI/IFETCH DSI/IFETCH
DSO/IPIPE DSO/IPIPE
BKPT/DSCLK BKPT/DSCLK
GPT PGP7/IC4/OC5 Discrete Input
PGP[6:3]/OC[4:1] Discrete Input
PGP[2:0]/IC[3:1] Discrete Input
PAI Discrete Input
PCLK Discrete Input
PWMA, PWMB Discrete Output
QSM PQS7/TXD Discrete Input
PQS[6:4]/PCS[3:1] Discrete Input
PQS3/PCS0/SS Discrete Input
PQS2/SCK Discrete Input
PQS1/MOSI Discrete Input
PQS0/MISO Discrete Input
RXD RXD
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4.6.5.2 Reset States of Pins Assigned to Other MCU Modules
As a rule, module pins that are assigned to general-purpose I/O ports go to active high-
impedance state following reset. Other pin states are determined by individual module
control register settings. Refer to sections concerning modules for details. However,
during power-up reset, module port pins may be in an indeterminate state for a short
period. Refer to 4.6.7 Power-On Reset for more information.
4.6.6 Reset Timing
The RESET input must be asserted for a specified minimum period for reset to occur.
External RESET assertion can be delayed internally for a period equal to the longest
bus cycle time (or the bus monitor time-out period) in order to protect write cycles from
being aborted by reset. While RESET is asserted, SIM pins are either in an inactive,
high impedance state or are driven to their inactive states.
When an external device asserts RESET for the proper period, reset control logic
clocks the signal into an internal latch. The control logic drives the RESET pin low for
an additional 512 CLKOUT cycles after it detects that the RESET signal is no longer
being externally driven, to guarantee this length of reset to the entire system.
Table 4-18 SIM Pin Reset States
State While Pin State After RESET Released
Mnemonic RESET
Asserted Pin
Function Pin State Pin
Function Pin State
CS10/ADDR23 1 CS10 1 ADDR23 Unknown
CS[9:6]/ADDR[22:19]/PC[6:3] 1 CS[9:6] 1 ADDR[22:19] Unknown
ADDR[18:0] High-Z Output ADDR[18:0] Unknown ADDR[18:0] Unknown
AS/PE5 High-Z Output AS Output PE5 Input
AVEC/PE2 Disabled AVEC Input PE2 Input
BERR Disabled BERR Input BERR Input
CSM/BG 1 CSM 1BG1
CSE/BGACK 1 CSE 1 BGACK Input
CS0/BR 1 CS0 1BRInput
CLKOUT Output CLKOUT Output CLKOUT Output
CSBOOT 1 CSBOOT 0 CSBOOT 0
DATA[15:0] Mode Select DATA[15:0] Input DATA[15:0] Input
DS/PE4 Disabled DS Output PE4 Input
DSACK0/PE0 Disabled DSACK0 Input PE0 Input
DSACK1/PE1 Disabled DSACK1 Input PE1 Input
CS5/FC2/PC2 1 CS5 1 FC2 Unknown
FC1/PC1 1 FC1 1 FC1 Unknown
CS3/FC0/PC0 1 CS3 1 FC0 Unknown
HALT Disabled HALT Input HALT Input
IRQ[7:1]/PF[7:1] Disabled IRQ[7:1] Input PF[7:1] Input
MODCLK/PF0 Mode Select MODCLK Input PF0 Input
R/W Disabled R/W Output R/W Output
RESET Asserted RESET Input RESET Input
RMC Disabled RMC Output PE3 Input
SIZ[1:0]/PE[7:6] Disabled SIZ[1:0] Unknown PE[7:6] Input
TSC Mode Select TSC Input TSC Input
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If an internal source asserts a reset signal, the reset control logic asserts RESET for
a minimum of 512 cycles. If the reset signal is still asserted at the end of 512 cycles,
the control logic continues to assert RESET until the internal reset signal is negated.
After 512 cycles have elapsed, the reset input pin goes to an inactive, high-impedance
state for ten cycles. At the end of this 10-cycle period, the reset input is tested. When
the input is at logic level one, reset exception processing begins. If, however, the reset
input is at logic level zero, the reset control logic drives the pin low for another 512 cy-
cles. At the end of this period, the pin again goes to high-impedance state for ten cy-
cles, then it is tested again. The process repeats until RESET is released.
4.6.7 Power-On Reset
When the SIM clock synthesizer is used to generate system clocks, power-on reset
involves special circumstances related to application of system and clock synthesizer
power. Regardless of clock source, voltage must be applied to clock synthesizer pow-
er input pin VDDSYN for the MCU to operate. The following discussion assumes that
VDDSYN is applied before and during reset, which minimizes crystal start-up time.
When VDDSYN is applied at power-on, start-up time is affected by specific crystal pa-
rameters and by oscillator circuit design. VDD ramp-up time also affects pin state dur-
ing reset. Refer to APPENDIX A ELECTRICAL CHARACTERISTICS for voltage and
timing specifications.
During power-on reset, an internal circuit in the SIM drives the IMB internal (MSTRST)
and external (EXTRST) reset lines. The circuit releases MSTRST as VDD ramps up to
the minimum specified value, and SIM pins are initialized as shown in Table 4-19. As
VDD reaches specified minimum value, the clock synthesizer VCO begins operation
and clock frequency ramps up to specified limp mode frequency. The external RESET
line remains asserted until the clock synthesizer PLL locks and 512 CLKOUT cycles
elapse.
The SIM clock synthesizer provides clock signals to the other MCU modules. After the
clock is running and MSTRST is asserted for at least four clock cycles, these modules
reset. VDD ramp time and VCO frequency ramp time determine how long the four cy-
cles take. Worst case is approximately 15 milliseconds. During this period, module
port pins may be in an indeterminate state. While input-only pins can be put in a known
state by external pull-up resistors, external logic on input/output or output-only pins
during this time must condition the lines. Active drivers require high-impedance buffers
or isolation resistors to prevent conflict.
Figure 4-16 is a timing diagram of power-up reset. It shows the relationships between
RESET, VDD, and bus signals.
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Figure 4-16 Power-On Reset
4.6.8 Reset Processing Summary
To prevent write cycles in progress from being corrupted, a reset is recognized at the
end of a bus cycle, and not at an instruction boundary. Any processing in progress at
the time a reset occurs is aborted. After SIM reset control logic has synchronized an
internal or external reset request, it asserts the MSTRST signal.
The following events take place when MSTRST is asserted.
A. Instruction execution is aborted.
B. The status register is initialized.
1. The T0 and T1 bits are cleared to disable tracing.
2. The S bit is set to establish supervisor privilege level.
3. The interrupt priority mask is set to $7, disabling all interrupts below priority
7.
C. The vector base register is initialized to $000000.
The following events take place when MSTRST is negated after assertion.
A. The CPU32 samples the BKPT input.
B. The CPU32 fetches the reset vector:
1. The first long word of the vector is loaded into the interrupt stack pointer.
2. The second long word of the vector is loaded into the program counter.
Vectors can be fetched from internal RAM or from external ROM enabled by the
CSBOOT signal.
C. The CPU32 fetches and begins decoding the first instruction to be executed.
32 POR TIM
CLKOUT
VCO
LOCK
BUS
CYCLES
RESET
VDD
1
BUS STATE
UNKNOWN
ADDRESS AND
CONTROL SIGNALS
THREE-STATED
512 CLOCKS
NOTES:
1. Internal start-up time.
2. SSP fetched.
3. PC fetched.
4. First instruction fetched.
10 CLOCKS
4
32
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4.6.9 Reset Status Register
The reset status register (RSR) contains a bit for each reset source in the MCU. When
a reset occurs, a bit corresponding to the reset type is set. When multiple causes of
reset occur at the same time, more than one bit in RSR may be set. The reset status
register is updated by the reset control logic when the RESET signal is released. Refer
to APPENDIX D REGISTER SUMMARY.
4.7 Interrupts
Interrupt recognition and servicing involve complex interaction between the system in-
tegration module, the central processing unit, and a device or module requesting in-
terrupt service. This discussion provides an overview of the entire interrupt process.
Chip-select logic can also be used to respond to interrupt requests. Refer to 4.8 Chip
Selects for more information.
4.7.1 Interrupt Exception Processing
The CPU32 processes resets as a type of asynchronous exception. An exception is
an event that preempts normal processing. Each exception has an assigned vector in
an exception vector table that points to an associated handler routine. The CPU uses
vector numbers to calculate displacement into the table. During exception processing,
the CPU fetches the appropriate vector and executes the exception handler routine to
which the vector points.
Out of reset, the exception vector table is located beginning at address $000000. This
value can be changed by programming the vector base register (VBR) with a new val-
ue, and multiple vector tables can be used. Refer to SECTION 5 CENTRAL PRO-
CESSING UNIT for more information concerning exceptions.
4.7.2 Interrupt Priority and Recognition
The CPU32 provides eight levels of interrupt priority. All interrupts with priorities less
than seven can be masked by the interrupt priority (IP) field in status register.
There are seven interrupt request signals (IRQ[7:1]). These signals are used internally
on the IMB, and are corresponding pins for external interrupt service requests. The
CPU treats all interrupt requests as though they come from internal modules — exter-
nal interrupt requests are treated as interrupt service requests from the SIM. Each of
the interrupt request signals corresponds to an interrupt priority level. IRQ1 has the
lowest priority and IRQ7 the highest.
Interrupt recognition is determined by interrupt priority level and interrupt priority mask
value. The interrupt priority mask consists of three bits in the CPU32 status register.
Binary values %000 to %111 provide eight priority masks. Masks prevent an interrupt
request of a priority less than or equal to the mask value from being recognized and
processed. IRQ7, however, is always recognized, even if the mask value is %111.
IRQ[7:1] are active-low level-sensitive inputs. The low on the pin must remain asserted
until an interrupt acknowledge cycle corresponding to that level is detected.
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IRQ7 is transition-sensitive as well as level-sensitive: a level-7 interrupt is not detected
unless a falling edge transition is detected on the IRQ7 line. This prevents redundant
servicing and stack overflow. A nonmaskable interrupt is generated each time IRQ7 is
asserted as well as each time the priority mask changes from %111 to a lower number
while IRQ7 is asserted.
Interrupt requests are sampled on consecutive falling edges of the system clock. In-
terrupt request input circuitry has hysteresis: to be valid, a request signal must be as-
serted for at least two consecutive clock periods. Valid requests do not cause
immediate exception processing, but are left pending. Pending requests are pro-
cessed at instruction boundaries or when exception processing of higher-priority ex-
ceptions is complete.
The CPU32 does not latch the priority of a pending interrupt request. If an interrupt
source of higher priority makes a service request while a lower priority request is pend-
ing, the higher priority request is serviced. If an interrupt request with a priority equal
to or lower than the current IP mask value is made, the CPU32 does not recognize the
occurrence of the request. If simultaneous interrupt requests of different priorities are
made, and both have a priority greater than the mask value, the CPU32 recognizes
the higher-level request.
4.7.3 Interrupt Acknowledge and Arbitration
When the CPU32 detects one or more interrupt requests of a priority higher than the
interrupt priority mask value, it places the interrupt request level on the address bus
and initiates a CPU space read cycle. The request level serves two purposes: it is de-
coded by modules or external devices that have requested interrupt service, to deter-
mine whether the current interrupt acknowledge cycle pertains to them, and it is
latched into the interrupt priority mask field in the CPU32 status register, to preclude
further interrupts of lower priority during interrupt service.
Modules or external devices that have requested interrupt service must decode the in-
terrupt priority mask value placed on the address bus during the interrupt acknowledge
cycle and respond if the priority of the service request corresponds to the mask value.
However, before modules or external devices respond, interrupt arbitration takes
place.
Arbitration is performed by means of serial contention between values stored in indi-
vidual module interrupt arbitration (IARB) fields. Each module that can make an inter-
rupt service request, including the SIM, has an IARB field in its configuration register.
IARB fields can be assigned values from %0000 to %1111. In order to implement an
arbitration scheme, each module that can initiate an interrupt service request must be
assigned a unique, non-zero IARB field value during system initialization. Arbitration
priorities range from %0001 (lowest) to %1111 (highest) — if the CPU recognizes an
interrupt service request from a source that has an IARB field value of %0000, a spu-
rious interrupt exception is processed.
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4-48 USER’S MANUAL
WARNING
Do not assign the same arbitration priority to more than one module.
When two or more IARB fields have the same nonzero value, the
CPU32 interprets multiple vector numbers at the same time, with un-
predictable consequences.
Because the EBI manages external interrupt requests, the SIM IARB value is used for
arbitration between internal and external interrupt requests. The reset value of IARB
for the SIM is %1111, and the reset IARB value for all other modules is %0000.
Although arbitration is intended to deal with simultaneous requests of the same prior-
ity, it always takes place, even when a single source is requesting service. This is im-
portant for two reasons: the EBI does not transfer the interrupt acknowledge read cycle
to the external bus unless the SIM wins contention, and failure to contend causes the
interrupt acknowledge bus cycle to be terminated early, by a bus error.
When arbitration is complete, the module with the highest arbitration priority must ter-
minate the bus cycle. Internal modules place an interrupt vector number on the data
bus and generate appropriate internal cycle termination signals. In the case of an ex-
ternal interrupt request, after the interrupt acknowledge cycle is transferred to the ex-
ternal bus, the appropriate external device must decode the mask value and respond
with a vector number, then generate data and size acknowledge (DSACK) termination
signals, or it must assert the autovector (AVEC) request signal. If the device does not
respond in time, the EBI bus monitor asserts the bus error signal BERR, and a spuri-
ous interrupt exception is taken.
Chip-select logic can also be used to generate internal AVEC or DSACK signals in re-
sponse to interrupt requests from external devices (refer to 4.8.3 Using Chip-Select
Signals for Interrupt Acknowledge). Chip-select address match logic functions only
after the EBI transfers an interrupt acknowledge cycle to the external bus following
IARB contention. If a module makes an interrupt request of a certain priority, and the
appropriate chip-select registers are programmed to generate AVEC or DSACK sig-
nals in response to an interrupt acknowledge cycle for that priority level, chip-select
logic does not respond to the interrupt acknowledge cycle, and the internal module
supplies a vector number and generates internal cycle termination signals.
For periodic timer interrupts, the PIRQ field in the periodic interrupt control register (PI-
CR) determines PIT priority level. A PIRQ value of %000 means that PIT interrupts are
inactive. By hardware convention, when the CPU32 receives simultaneous interrupt
requests of the same level from more than one SIM source (including external devic-
es), the periodic interrupt timer is given the highest priority, followed by the IRQ pins.
4.7.4 Interrupt Processing Summary
A summary of the entire interrupt processing sequence follows. When the sequence
begins, a valid interrupt service request has been detected and is pending.
A. The CPU finishes higher priority exception processing or reaches an instruction
boundary.
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MC68332 SYSTEM INTEGRATION MODULE
USER’S MANUAL 4-49
B. The processor state is stacked. The S bit in the status register is set, establish-
ing supervisor access level, and bits T1 and T0 are cleared, disabling tracing.
C. The interrupt acknowledge cycle begins:
1. FC[2:0] are driven to %111 (CPU space) encoding.
2. The address bus is driven as follows: ADDR[23:20] = %1111; ADDR[19:16]
= %1111, which indicates that the cycle is an interrupt acknowledge CPU
space cycle; ADDR[15:4] = %111111111111; ADDR[3:1] = the priority of
the interrupt request being acknowledged; and ADDR0 = %1.
3. The request level is latched from the address bus into the interrupt priority
mask field in the status or condition code register.
D. Modules that have requested interrupt service decode the priority value in AD-
DR[3:1]. If request priority is the same as acknowledged priority, arbitration by
IARB contention takes place.
E. After arbitration, the interrupt acknowledge cycle is completed in one of the fol-
lowing ways:
1. When there is no contention (IARB = %0000), the spurious interrupt moni-
tor asserts BERR, and the CPU generates the spurious interrupt vector
number.
2. The dominant interrupt source supplies a vector number and DSACK sig-
nals appropriate to the access. The CPU acquires the vector number.
3. The AVEC signal is asserted (the signal can be asserted by the dominant
interrupt source or the pin can be tied low), and the CPU generates an au-
tovector number corresponding to interrupt priority.
4. The bus monitor asserts BERR and the CPU32 generates the spurious in-
terrupt vector number.
F. The vector number is converted to a vector address.
G. The content of the vector address is loaded into the PC, and the processor
transfers control to the exception handler routine.
4.7.5 Interrupt Acknowledge Bus Cycles
Interrupt acknowledge bus cycles are CPU32 space cycles that are generated during
exception processing. For further information about the types of interrupt acknowledge
bus cycles determined by AVEC or DSACK, refer to APPENDIX A ELECTRICAL
CHARACTERISTICS and the
SIM Reference Manual
(SIMRM/AD).
4.8 Chip Selects
Typical microcontrollers require additional hardware to provide external chip-select
and address decode signals. The MCU includes 12 programmable chip-select circuits
that can provide 2- to 20-clock-cycle access to external memory and peripherals. Ad-
dress block sizes of two Kbytes to one Mbyte can be selected. Figure 4-17 is a dia-
gram of a basic system that uses chip selects.
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SYSTEM INTEGRATION MODULE MC68332
4-50 USER’S MANUAL
Figure 4-17 Basic MCU System
Chip-select assertion can be synchronized with bus control signals to provide output
enable, read/write strobe, or interrupt acknowledge signals. Chip select logic can also
generate DSACK and AVEC signals internally. Each signal can also be synchronized
with the ECLK signal available on ADDR23.
When a memory access occurs, chip-select logic compares address space type, ad-
dress, type of access, transfer size, and interrupt priority (in the case of interrupt ac-
knowledge) to parameters stored in chip-select registers. If all parameters match, the
appropriate chip-select signal is asserted. Select signals are active low. If a chip-select
function is given the same address as a microcontroller module or an internal memory
array, an access to that address goes to the module or array, and the chip-select sig-
nal is not asserted. The external address and data buses do not reflect the internal ac-
cess.
All chip-select circuits are configured for operation out of reset. However, all chip-se-
lect signals except CSBOOT are disabled, and cannot be asserted until the BYTE field
32 EXAMPLE SYS BLOCK
ADDR[23:0]
SIZ
CLKOUT
AS
FC
DSACK
DS
R/W
DATA[15:0]
CS3
CS5
IRQ
CSBOOT
ADDR[15:0]
SIZ
CLK
DSACK
AS
DS
CS
DATA[15:0]
IACK
IRQ
ADDR[23:0]
DATA[15:8]
CS
R/W
MEMORY
ADDR[23:0]
DATA[7:0]
CS
R/W
MEMORY
MCU
ASYNC BUS
PERIPHERAL
1
2
2
2
1. Can be decoded to provide additional address space.
2. Varies depending upon peripheral memory size.
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MC68332 SYSTEM INTEGRATION MODULE
USER’S MANUAL 4-51
in the corresponding option register is programmed to a nonzero value, selecting a
transfer size. The chip-select option must not be written until a base address has been
written to a proper base address register. CSBOOT is automatically asserted out of
reset. Alternate functions for chip-select pins are enabled if appropriate data bus pins
are held low at the release of the reset signal (refer to 4.6.3.1 Data Bus Mode Selec-
tion for more information). Figure 4-18 is a functional diagram of a single chip-select
circuit.
Figure 4-18 Chip-Select Circuit Block Diagram
4.8.1 Chip-Select Registers
Each chip-select pin can have one or more functions. Chip-select pin assignment reg-
isters (CSPAR[0:1]) determine functions of the pins. Pin assignment registers also de-
termine port size (8- or 16-bit) for dynamic bus allocation. A pin data register (PORTC)
latches data for chip-select pins that are used for discrete output.
Blocks of addresses are assigned to each chip-select function. Block sizes of two
Kbytes to one Mbyte can be selected by writing values to the appropriate base address
register (CSBAR[0:10], CSBARBT). Address blocks for separate chip-select functions
can overlap.
Chip select option registers (CSOR[0:10], CSORBT) determine timing of and condi-
tions for assertion of chip-select signals. Eight parameters, including operating mode,
access size, synchronization, and wait state insertion can be specified.
Initialization software usually resides in a peripheral memory device controlled by the
chip-select circuits. A set of special chip-select functions and registers (CSORBT, CS-
BARBT) is provided to support bootstrap operation.
Comprehensive address maps and register diagrams are provided in APPENDIX D
REGISTER SUMMARY.
CHIP SEL BLOCK
AVEC
GENERATOR DSACK
GENERATOR
PIN
ASSIGNMENT
REGISTER
PIN
DATA
REGISTER
BASE ADDRESS REGISTER
TIMING
AND
CONTROL
ADDRESS COMPARATOR
OPTION COMPARE
OPTION REGISTER
AVEC
DSACK
PIN
BUS CONTROL
INTERNAL
SIGNALS
ADDRESS
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4-52 USER’S MANUAL
4.8.1.1 Chip-Select Pin Assignment Registers
The pin assignment registers contain twelve 2-bit fields (CS[10:0] and CSBOOT) that
determine the functions of the chip-select pins. Each pin has two or three possible
functions, as shown in Table 4-19.
Table 4-20 shows pin assignment field encoding. Pins that have no discrete output
function do not use the %00 encoding.
Port size determines the way in which bus transfers to an external address are allo-
cated. Port size of eight bits or sixteen bits can be selected when a pin is assigned as
a chip select. Port size and transfer size affect how the chip-select signal is asserted.
Refer to 4.8.1.3 Chip-Select Option Registers for more information.
Out of reset, chip-select pin function is determined by the logic level on a correspond-
ing data bus pin. These pins have weak internal pull-up drivers, but can be held low
by external devices. (Refer to 4.6.3.1 Data Bus Mode Selection for more informa-
tion.) Either 16-bit chip-select function (%11) or alternate function (%01) can be select-
ed during reset. All pins except the boot ROM select pin (CSBOOT) are disabled out
of reset. There are twelve chip-select functions and only eight associated data bus
pins. There is not a one-to-one correspondence. Refer to 4.8.4 Chip-Select Reset
Operation for more detailed information.
The CSBOOT signal is normally enabled out of reset. The state of the DATA0 line dur-
ing reset determines what port width CSBOOT uses. If DATA0 is held high (either by
the weak internal pull-up driver or by an external pull-up device), 16-bit width is select-
ed. If DATA0 is held low, 8-bit port size is selected.
Table 4-19 Chip-Select Pin Functions
16-Bit
Chip Select 8-Bit
Chip Select Alternate
Function Discrete Output
CSBOOT CSBOOT CSBOOT —
CS0 CS0 BR —
CS1 CS1 BG —
CS2 CS2 BGACK —
CS3 CS3 FC0 PC0
CS4 CS4 FC1 PC1
CS5 CS5 FC2 PC2
CS6 CS6 ADDR19 PC3
CS7 CS7 ADDR20 PC4
CS8 CS8 ADDR21 PC5
CS9 CS9 ADDR22 PC6
CS10 CS10 ADDR23 ECLK
Table 4-20 Pin Assignment Field Encoding
Bit Field Description
00 Discrete Output
01 Alternate Function
10 Chip Select (8-Bit Port)
11 Chip Select (16-Bit Port)
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A pin programmed as a discrete output drives an external signal to the value specified
in the pin data register. No discrete output function is available on pins CSBOOT, BR,
BG, or BGACK. ADDR23 provides ECLK output rather than a discrete output signal.
When a pin is programmed for discrete output or alternate function, internal chip-select
logic still functions and can be used to generate DSACK or AVEC internally on an ad-
dress and control signal match.
4.8.1.2 Chip-Select Base Address Registers
Each chip select has an associated base address register. A base address is the low-
est address in the block of addresses enabled by a chip select. Block size is the extent
of the address block above the base address. Block size is determined by the value
contained in a BLKSZ field. Block addresses for different chip selects can overlap.
The BLKSZ field determines which bits in the base address field are compared to cor-
responding bits on the address bus during an access. Provided other constraints de-
termined by option register fields are also satisfied, when a match occurs, the
associated chip-select signal is asserted. Table 4-21 shows BLKSZ encoding.
The chip-select address compare logic uses only the most significant bits to match an
address within a block. The value of the base address must be a multiple of block size.
Base address register diagrams show how base register bits correspond to address
lines.
After reset, the MCU fetches the initialization routine from the address contained in the
reset vector, located beginning at address $000000 of program space. To support
bootstrap operation from reset, the base address field in chip-select base address reg-
ister boot (CSBARBT) has a reset value of all zeros. A memory device containing the
reset vector and initialization routine can be automatically enabled by CSBOOT after
a reset. The block size field in CSBARBT has a reset value of 512 Kbytes. Refer to
4.8.4 Chip-Select Reset Operation for more information.
4.8.1.3 Chip-Select Option Registers
Option register fields determine timing of and conditions for assertion of chip-select
signals. To assert a chip-select signal, and to provide DSACK or autovector support,
other constraints set by fields in the option register and in the base address register
must also be satisfied. Table 4-22 is a summary of option register functions.
Table 4-21 Block Size Encoding
BLKSZ[2:0] Block Size Address Lines Compared
000 2 Kbyte ADDR[23:11]
001 8 Kbyte ADDR[23:13]
010 16 Kbyte ADDR[23:14]
011 64 Kbyte ADDR[23:16]
100 128 Kbyte ADDR[23:17]
101 256 Kbyte ADDR[23:18]
110 512 Kbyte ADDR[23:19]
111 1 Mbyte ADDR[23:20]
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SYSTEM INTEGRATION MODULE MC68332
4-54 USER’S MANUAL
*Use this value when function is not required for chip-select operation.
The MODE bit determines whether chip-select assertion simulates an asynchronous
bus cycle, or is synchronized to the M6800-type bus clock signal (ECLK) available on
ADDR23 (refer to 4.3 System Clock for more information on ECLK).
The BYTE field controls bus allocation for chip-select transfers. Port size, set when a
chip select is enabled by a pin assignment register, affects signal assertion. When an
8-bit port is assigned, any BYTE field value other than %00 enables the chip select
signal. When a 16-bit port is assigned, however, BYTE field value determines when
the chip select is enabled. The BYTE fields for CS[10:0] are cleared during reset. How-
ever, both bits in the boot ROM option register (CSORBT) BYTE field are set (%11)
when the reset signal is released.
The R/W field causes a chip-select signal to be asserted only for a read, only for a
write, or for both read and write. Use this field in conjunction with the STRB bit to gen-
erate asynchronous control signals for external devices.
The STRB bit controls the timing of a chip-select assertion in asynchronous mode. Se-
lecting address strobe causes a chip-select signal to be asserted synchronized with
the address strobe. Selecting data strobe causes a chip-select signal to be asserted
synchronized with the data strobe. This bit has no effect in synchronous mode.
The DSACK field specifies the source of data strobe acknowledge signals used in
asynchronous mode. It also allows the user to optimize bus speed in a particular ap-
plication by controlling the number of wait states that are inserted.
The SPACE field determines the address space in which a chip select is asserted. An
access must have the space type represented by SPACE encoding in order for a chip-
select signal to be asserted.
The IPL field contains an interrupt priority mask that is used when chip-select logic is
set to trigger on external interrupt acknowledge cycles. When the SPACE field is set
Table 4-22 Option Register Function Summary
MODE BYTE R/W STRB DSACK SPACE IPL AVEC
0 = ASYNC* 00 = Disable 00 = Rsvd 0 = AS 0000 = 0 WAIT 00 = CPU SP 000 = All* 0 = Off*
1 = SYNC 01 = Lower 01 = Read 1 = DS 0001 = 1 WAIT 01 = User SP 001 = Priority 1 1 = On
10 = Upper 10 = Write 0010 = 2 WAIT 10 = Supv SP 010 = Priority 2
*11 = Both 11 = Both 0011 = 3 WAIT 11 = S/U SP* 011 = Priority 3
0100 = 4 WAIT 100 = Priority 4
0101 = 5 WAIT 101 = Priority 5
0110 = 6 WAIT 110 = Priority 6
0111 = 7 WAIT 111 = Priority 7
1000 = 8 WAIT
1001 = 9 WAIT
1010 = 10 WAIT
1011 = 11 WAIT
1100 = 12 WAIT
1101 = 13 WAIT
1110 = F term
1111 = External
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MC68332 SYSTEM INTEGRATION MODULE
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to %00 (CPU space), interrupt priority (ADDR[3:1]) is compared to IPL value. If the val-
ues are the same, and other option register constraints are satisfied, a chip select sig-
nal is asserted. This field only affects the response of chip selects and does not affect
interrupt recognition by the CPU. Encoding %000 causes a chip-select signal to be as-
serted regardless of interrupt acknowledge cycle priority, provided all other constraints
are met.
The AVEC bit selects one of two methods of acquiring an interrupt vector during an
external interrupt acknowledge cycle. The internal autovector signal is generated only
in response to interrupt requests from the SIM IRQ pins.
4.8.1.4 PORTC Data Register
The PORTC data register latches data for PORTC pins programmed as discrete out-
puts. When a pin is assigned as a discrete output, the value in this register appears at
the output. PC[6:0] correspond to CS[9:3]. Bit 7 is not used. Writing to this bit has no
effect, and it always reads zero.
4.8.2 Chip-Select Operation
When the MCU makes an access, enabled chip-select circuits compare the following
items:
1. Function codes to SPACE fields, and to the IPL field if the SPACE field encod-
ing is not for CPU32 space.
2. Appropriate ADDR bits to base address fields.
3. Read/write status to R/W fields.
4. ADDR0 and/or SIZ bits to the BYTE field (16-bit ports only).
5. Priority of the interrupt being acknowledged (ADDR[3:1]) to IPL fields (when the
access is an interrupt acknowledge cycle).
When a match occurs, the chip-select signal is asserted. Assertion occurs at the same
time as AS or DS assertion in asynchronous mode. Assertion is synchronized with
ECLK in synchronous mode. In asynchronous mode, the value of the DSACK field de-
termines whether DSACK is generated internally.DSACK also determines the number
of wait states inserted before internal DSACK assertion.
The speed of an external device determines whether internal wait states are needed.
Normally, wait states are inserted into the bus cycle during S3 until a peripheral as-
serts DSACK. If a peripheral does not generate DSACK, internal DSACK generation
must be selected and a predetermined number of wait states can be programmed into
the chip-select option register.
Refer to the
SIM Reference Manual
(SIMRM/AD) for further information.
4.8.3 Using Chip-Select Signals for Interrupt Acknowledge
Ordinary I/O bus cycles use supervisor space access, but interrupt acknowledge bus
cycles use CPU space access. Refer to 4.5.4 CPU Space Cycles and 4.7 Interrupts
for more information. There are no differences in flow for chip selects in each type of
space, but base and option registers must be properly programmed for each type of
external bus cycle.
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SYSTEM INTEGRATION MODULE MC68332
4-56 USER’S MANUAL
During a CPU space cycle, bits [15:3] of the appropriate base register must be config-
ured to match ADDR[23:11], as the address is compared to an address generated by
the CPU.
Figure 4-19 shows CPU space encoding for an interrupt acknowledge cycle. FC[2:0]
are set to %111, designating CPU space access. ADDR[3:1] indicate interrupt priority,
and the space type field (ADDR[19:16]) is set to %1111, the interrupt acknowledge
code. The rest of the address lines are set to one.
Figure 4-19 CPU Space Encoding for Interrupt Acknowledge
Because address match logic functions only after the EBI transfers an interrupt ac-
knowledge cycle to the external address bus following IARB contention, chip-select
logic generates AVEC or DSACK signals only in response to interrupt requests from
external IRQ pins. If an internal module makes an interrupt request of a certain priority,
and the chip-select base address and option registers are programmed to generate
AVEC or DSACK signals in response to an interrupt acknowledge cycle for that priority
level, chip-select logic does not respond to the interrupt acknowledge cycle, and the
internal module supplies a vector number and generates an internal DSACK signal to
terminate the cycle.
Perform the following operations before using a chip select to generate an interrupt ac-
knowledge signal.
1. Program the base address field to all ones.
2. Program block size to no more than 64 Kbytes, so that the address comparator
checks ADDR[19:16] against the corresponding bits in the base address regis-
ter. (The CPU32 places the CPU32 space type on ADDR[19:16].)
3. Set the R/W field to read only. An interrupt acknowledge cycle is performed as
a read cycle.
4. Set the BYTE field to lower byte when using a 16-bit port, as the external vector
for a 16-bit port is fetched from the lower byte. Set the BYTE field to upper byte
when using an 8-bit port.
If an interrupting device does not provide a vector number, an autovector acknowledge
must be generated. Asserting AVEC, either by asserting the AVEC pin or by generat-
ing AVEC internally using the chip-select option register, terminates the bus cycle.
4.8.4 Chip-Select Reset Operation
The least significant bits of each of the 2-bit CS[10:0] pin assignment fields in CSPAR0
and CSPAR1 each have a reset value of one. The reset values of the most significant
bits of each field are determined by the states of DATA[7:1] during reset. There are
CPU SPACE IACK TIM
11111111111111111111 1111 LEVEL
19 1623
FUNCTION
CODE
20 0
CPU SPACE
TYPE FIELD
ADDRESS BUS
INTERRUPT
ACKNOWLEDGE
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MC68332 SYSTEM INTEGRATION MODULE
USER’S MANUAL 4-57
weak internal pull-up drivers for each of the data lines, so that chip-select operation
will be selected by default out of reset. However, the internal pull-up drivers can be
overcome by bus loading effects — to insure a particular configuration out of reset, use
an active device to put the data lines in a known state during reset. The base address
fields in chip-select base address registers CSBAR[0:10] and chip select option regis-
ters CSOR[0:10] have the reset values shown in Table 4-23. The BYTE fields of
CSOR[0:10] have a reset value of “disable”, so that a chip-select signal cannot be as-
serted until the base and option registers are initialized.
Following reset, the MCU fetches initial stack pointer and program counter values from
the exception vector table, beginning at $000000 in supervisor program space. The
CSBOOT chip-select signal is used to select an external boot ROM mapped to a base
address of $000000. In order to do this, the reset values of the fields that control CS-
BOOT must be different from those of other chip select signals.
The MSB of the CSBOOT field in CSPAR0 has a reset value of one, so that chip-select
function is selected by default out of reset. The BYTE field in option register CSORBT
has a reset value of “both bytes” so that the select signal is enabled out of reset. The
LSB value of the CSBOOT field, determined by the logic level of DATA0 during reset,
selects boot ROM port size. When DATA0 is held low during reset, port size is eight
bits. When DATA0 is held high during reset, port size is 16 bits. DATA0 has a weak
internal pull-up driver, so that a 16-bit port will be selected by default out of reset. How-
ever, the internal pull-up driver can be overcome by bus loading effects —to insure a
particular configuration out of reset, use an active device to put DATA0 in a known
state during reset.
The base address field in chip-select base address register boot (CSBARBT) has a
reset value of all zeros, so that when the initial access to address $000000 is made,
an address match occurs, and the CSBOOT signal is asserted. The block size field in
CSBARBT has a reset value of 1 Mbyte. Table 4-24 shows CSBOOT reset values.
Table 4-23 Chip Select Base and Option
Register Reset Values
Fields Reset Values
Base Address $000000
Block Size 2 Kbyte
Async/Sync Mode Asynchronous Mode
Upper/Lower Byte Disabled
Read/Write Reserved
AS/DS AS
DSACK No Wait States
Address Space CPU Space
IPL Any Level
Autovector External Interrupt Vector
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4.9 Parallel Input/Output Ports
Fifteen SIM pins can be configured for general-purpose discrete input and output. Al-
though these pins are organized into two ports, port E and port F, function assignment
is by individual pin. Pin assignment registers, data direction registers, and data regis-
ters are used to implement discrete I/O.
4.9.1 Pin Assignment Registers
Bits in the port E and port F pin assignment registers (PEPAR and PFPAR) control the
functions of the pins in each port. Any bit set to one defines the corresponding pin as
a bus control signal. Any bit cleared to zero defines the corresponding pin as an I/O
pin.
4.9.2 Data Direction Registers
Bits in the port E and port F data direction registers (DDRE and DDRF) control the di-
rection of the pin drivers when the pins are configured as I/O. Any bit in a register set
to one configures the corresponding pin as an output. Any bit in a register cleared to
zero configures the corresponding pin as an input. These registers can be read or writ-
ten at any time. Writes have no effect.
4.9.3 Data Registers
A write to the port E and port F data registers (PORTE and PORTF) is stored in an
internal data latch, and if any pin in the corresponding port is configured as an output,
the value stored for that bit is driven out on the pin. A read of a data register returns
the value at the pin only if the pin is configured as a discrete input. Otherwise, the value
read is the value stored in the register. Both data registers can be accessed in two lo-
cations. Registers can be read or written at any time.
4.10 Factory Test
The test submodule supports scan-based testing of the various MCU modules. It is in-
tegrated into the SIM to support production test. Test submodule registers are intend-
ed for Freescale use only. Register names and addresses are provided in APPENDIX
D REGISTER SUMMARY to show the user that these addresses are occupied. The
QUOT pin is also used for factory test.
Table 4-24 CSBOOT Base and Option Register Reset Values
Fields Reset Values
Base Address $000000
Block Size 1 Mbyte
Async/Sync Mode Asynchronous Mode
Upper/Lower Byte Both Bytes
Read/Write Read/Write
AS/DS AS
DSACK 13 Wait States
Address Space Supervisor/User Space
IPL Any Level
Autovector Interrupt Vector Externally
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MC68332 CENTRAL PROCESSING UNIT
USER’S MANUAL 5-1
SECTION 5 CENTRAL PROCESSING UNIT
The CPU32, the instruction processing module of the M68300 family, is based on the
industry-standard MC68000 processor. It has many features of the MC68010 and
MC68020, as well as unique features suited for high-performance controller applica-
tions. This section is an overview of the CPU32. For detailed information concerning
CPU operation, refer to the
CPU32 Reference Manual
(CPU32RM/AD).
5.1 General
Ease of programming is an important consideration in using a microcontroller. The
CPU32 instruction format reflects a philosophy emphasizing register-memory interac-
tion. There are eight multifunction data registers and seven general-purpose address-
ing registers.
All data resources are available to all operations requiring those resources. The data
registers readily support 8-bit (byte), 16-bit (word), and 32-bit (long-word) operand
lengths for all operations. Word and long-word operations support address manipula-
tion. Although the program counter (PC) and stack pointers (SP) are special-purpose
registers, they are also available for most data addressing activities. Ease of program
checking and diagnosis is further enhanced by trace and trap capabilities at the in-
struction level.
A block diagram of the CPU32 is shown in Figure 5-1. The major blocks operate in a
highly independent fashion that maximizes concurrence of operation while managing
the essential synchronization of instruction execution and bus operation. The bus con-
troller loads instructions from the data bus into the decode unit. The sequencer and
control unit provide overall chip control, managing the internal buses, registers, and
functions of the execution unit.
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Figure 5-1 CPU32 Block Diagram
5.2 CPU32 Registers
The CPU32 programming model consists of two groups of registers that correspond
to the user and supervisor privilege levels. User programs can use only the registers
of the user model. The supervisor programming model, which supplements the user
programming model, is used by CPU32 system programmers who wish to protect sen-
sitive operating system functions. The supervisor model is identical to that of the
MC68010 and later processors.
The CPU32 has eight 32-bit data registers, seven 32-bit address registers, a 32-bit
program counter, separate 32-bit supervisor and user stack pointers, a 16-bit status
register, two alternate function code registers, and a 32-bit vector base register (see
Figure 5-2 and Figure 5-3).
INSTRUCTION PIPELINE
STAGE STAGE
CB
EXECUTION UNIT
PROGRAM
COUNTER
SECTION
DATA
SECTION
WRITE PENDING
BUFFER PREFETCH
CONTROLLER
MICROBUS
CONTROLLER
ADDRESS
BUS DATA
BUS
BUS CONTROL
SIGNALS
STAGE
A
MICROSEQUENCER AND CONTROL
BUFFER
DECODE
CONTROL STORE
CONTROL LOGIC
1127A
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Figure 5-2 User Programming Model
Figure 5-3 Supervisor Programming Model Supplement
5.2.1 Data Registers
The eight data registers can store data operands of 1, 8, 16, 32, and 64 bits and ad-
dresses of 16 or 32 bits. The following data types are supported:
• Bits
• Packed Binary-Coded Decimal Digits
• Byte Integers (8 bits)
• Word Integers (16 bits)
• Long-Word Integers (32 bits)
• Quad-Word Integers (64 bits)
31 16 15 8 7 0
D0
D1
D2
D3 DATA REGISTERS
D4
D5
D6
D7
31 16 15 0
A0
A1
A2
A3 ADDRESS REGISTERS
A4
A5
A6
31 16 15 0
A7 (USP) USER STACK POINTER
31 0
PC PROGRAM COUNTER
70
CCR CONDITION CODE REGISTER
31 16 15 0
A7' (SSP) SUPERVISOR STACK
POINTER
15 8 7 0
(CCR) SR STATUS REGISTER
31 0
VBR VECTOR BASE REGISTER
20
SFC ALTERNATE FUNCTION
DFC CODE REGISTERS
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Each of data registers D7–D0 is 32 bits wide. Byte operands occupy the low-order 8
bits; word operands, the low-order 16 bits; and long-word operands, the entire 32 bits.
When a data register is used as either a source or destination operand, only the ap-
propriate low-order byte or word (in byte or word operations, respectively) is used or
changed; the remaining high-order portion is unaffected. The least significant bit (LSB)
of a long-word integer is addressed as bit zero, and the most significant bit (MSB) is
addressed as bit 31. Figure 5-4 shows the organization of various types of data in the
data registers.
Quad-word data consists of two long words and represents the product of 32-bit mul-
tiply or the dividend of 32-bit divide operations (signed and unsigned). Quad-words
may be organized in any two data registers without restrictions on order or pairing.
There are no explicit instructions for the management of this data type, although the
MOVEM instruction can be used to move a quad-word into or out of the registers.
Binary-coded decimal (BCD) data represents decimal numbers in binary form. CPU32
BCD instructions use a format in which a byte contains two digits. The four LSB con-
tain the least significant digit, and the four MSB contain the most significant digit. The
ABCD, SBCD, and NBCD instructions operate on two BCD digits packed into a single
byte.
Figure 5-4 Data Organization in Data Registers
31 30 1 0
MSB LSB
BYTE
31 24 23 16 15 8 7 0
HIGH-ORDER BYTE MIDDLE HIGH BYTE MIDDLE LOW BYTE LOW-ORDER BYTE
16-BIT WORD
31 16 15 0
HIGH-ORDER BYTE LOW-ORDER WORD
LONG-WORD
31 0
LONG-WORD
QUAD-WORD
63 62 32
MSB ANY Dy
31 1 0
ANY Dy LSB
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5.2.2 Address Registers
Each address register and stack pointer is 32 bits wide and holds a 32-bit address. Ad-
dress registers cannot be used for byte-sized operands. Therefore, when an address
register is used as a source operand, either the low-order word or the entire long-word
operand is used, depending upon the operation size. When an address register is
used as the destination operand, the entire register is affected, regardless of the op-
eration size. If the source operand is a word size, it is sign-extended to 32 bits. Ad-
dress registers are used primarily for addresses and to support address computation.
The instruction set includes instructions that add to, subtract from, compare, and move
the contents of address registers. Figure 5-5 shows the organization of addresses in
address registers.
Figure 5-5 Address Organization in Address Registers
5.2.3 Program Counter
The PC contains the address of the next instruction to be executed by the CPU32. Dur-
ing instruction execution and exception processing, the processor automatically incre-
ments the contents of the PC or places a new value in the PC as appropriate.
5.2.4 Control Registers
The control registers described in this section contain control information for supervi-
sor functions and vary in size. With the exception of the condition code register (the
user portion of the status register), they are accessed only by instructions at the su-
pervisor privilege level.
5.2.4.1 Status Register
The status register (SR) stores the processor status. It contains the condition codes
that reflect the results of a previous operation and can be used for conditional instruc-
tion execution in a program. The condition codes are extend (X), negative (N), zero
(Z), overflow (V), and carry (C). The user (low-order) byte containing the condition
codes is the only portion of the SR information available at the user privilege level; it
is referenced as the condition code register (CCR) in user programs.
At the supervisor privilege level, software can access the full status register. The upper
byte of this register includes the interrupt priority (IP) mask (three bits), two bits for
placing the processor in one of two tracing modes or disabling tracing, and the super-
visor/user bit for placing the processor at the desired privilege level.
Undefined bits in the status register are reserved by Freescale for future definition. The
undefined bits are read as zeros and should be written as zeros for future compatibility.
31 16 150
SIGN EXTENDED 16-BIT ADDRESS OPERAND
31 0
FULL 32-BIT ADDRESS OPERAND
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All operations to the SR and CCR are word-size operations, but for all CCR operations,
the upper byte is read as all zeros and is ignored when written, regardless of privilege
level.
Refer to APPENDIX D REGISTER SUMMARY for bit/field definitions and a diagram
of the status register.
5.2.4.2 Alternate Function Code Registers
Alternate function code registers (SFC and DFC) contain 3-bit function codes. Func-
tion codes can be considered extensions of the 24-bit linear address that optionally
provide as many as eight 16-Mbyte address spaces. The processor automatically gen-
erates function codes to select address spaces for data and programs at the user and
supervisor privilege levels and to select a CPU address space used for processor
functions (such as breakpoint and interrupt acknowledge cycles).
Registers SFC and DFC are used by the MOVES instruction to specify explicitly the
function codes of the memory address. The MOVEC instruction is used to transfer val-
ues to and from the alternate function code registers. This is a long-word transfer; the
upper 29 bits are read as zeros and are ignored when written.
5.2.5 Vector Base Register (VBR)
The VBR contains the base address of the 1024-byte exception vector table, consist-
ing of 256 exception vectors. Exception vectors contain the memory addresses of rou-
tines that begin execution at the completion of exception processing. Refer to 5.9
Exception Processing for more information on the VBR and exception processing.
5.3 Memory Organization
Memory is organized on a byte-addressable basis in which lower addresses corre-
spond to higher order bytes. For example, the address N of a long-word data item cor-
responds to the address of the most significant byte of the highest order word. The
address of the most significant byte of the low-order word is N + 2, and the address of
the least significant byte of the long word is N + 3. The CPU32 requires long-word and
word data and instructions to be aligned on word boundaries (refer to Figure 5-6).
Data misalignment is not supported.
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Figure 5-6 Memory Operand Addressing
BIT DATA
1 BYTE = 8 BITS
INTEGER DATA
1 BYTE = 8 BITS
76543210
MSB = Most Significant Bit
LSB = Least Significant Bit
ADDRESS 1
ADDRESS = 32 BITS
LONG WORD = 32 BITS
WORD = 16 BITS
15 0
WORD 1
WORD 2
HIGH ORDER
LOW ORDER
MSB
LSB
0
LSB
MSB
15
MSD = Most Significant Digit
LSD = Least Significant Digit
DECIMAL DATA
BCD DIGITS = 1 BYTE
15 12 11 8 7 4 3 0
MSDBCD 0
BCD 4
BCD 1
BCD 5
BCD 2
BCD 6
BCD 3
BCD 7
HIGH ORDER
LOW ORDER
MSB BYTE 0 LSB BYTE 1
BYTE 2 BYTE 3
15 8 7 0
15 0
MSB WORD 0 LSB
LSD
1125A
ADDRESS 1
ADDRESS 2
ADDRESS 0
LONG WORD 0
LONG WORD 1
LONG WORD 2
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5.4 Virtual Memory
The full addressing range of the CPU32 on the MC68331 is 16 Mbytes in each of eight
address spaces. Even though most systems implement a smaller physical memory,
the system can be made to appear to have a full 16 Mbytes of memory available to
each user program by using virtual memory techniques.
A system that supports virtual memory has a limited amount of high-speed physical
memory that can be accessed directly by the processor and maintains an image of a
much larger virtual memory on a secondary storage device. When the processor at-
tempts to access a location in the virtual memory map that is not resident in physical
memory, a page fault occurs. The access to that location is temporarily suspended
while the necessary data is fetched from secondary storage and placed in physical
memory. The suspended access is then restarted or continued.
The CPU32 uses instruction restart, which requires that only a small portion of the in-
ternal machine state be saved. After correcting the fault, the machine state is restored,
and the instruction is fetched and started again. This process is completely transpar-
ent to the application program.
5.5 Addressing Modes
Addressing in the CPU32 is register-oriented. Most instructions allow the results of the
specified operation to be placed either in a register or directly in memory. There is no
need for extra instructions to store register contents in memory.
There are seven basic addressing modes:
• Register Direct
• Register Indirect
• Register Indirect with Index
• Program Counter Indirect with Displacement
• Program Counter Indirect with Index
• Absolute
• Immediate
The register indirect addressing modes include postincrement, predecrement, and off-
set capability. The program counter indirect mode also has index and offset capabili-
ties. In addition to these addressing modes, many instructions implicitly specify the
use of the status register, stack pointer, and/or program counter.
5.6 Processing States
The processor is always in one of four processing states: normal, exception, halted, or
background. The normal processing state is associated with instruction execution; the
bus is used to fetch instructions and operands and to store results.
The exception processing state is associated with interrupts, trap instructions, tracing,
and other exception conditions. The exception may be internally generated explicitly
by an instruction or by an unusual condition arising during the execution of an instruc-
tion. Exception processing can be forced externally by an interrupt, a bus error, or a
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The halted processing state is an indication of catastrophic hardware failure. For ex-
ample, if during the exception processing of a bus error another bus error occurs, the
processor assumes that the system is unusable and halts.
The background processing state is initiated by breakpoints, execution of special in-
structions, or a double bus fault. Background processing is enabled by pulling BKPT
low during RESET. Background processing allows interactive debugging of the sys-
tem via a simple serial interface.
5.7 Privilege Levels
The processor operates at one of two levels of privilege: user or supervisor. Not all in-
structions are permitted to execute at the user level, but all instructions are available
at the supervisor level. Effective use of privilege level can protect system resources
from uncontrolled access. The state of the S bit in the status register determines the
privilege level and whether the user stack pointer (USP) or supervisor stack pointer
(SSP) is used for stack operations.
5.8 Instructions
The CPU32 instruction set is summarized in Table 5-1. The instruction set of the
CPU32 is very similar to that of the MC68020. Two new instructions have been added
to facilitate controller applications: low-power stop (LPSTOP) and table lookup and in-
terpolate (TBLS, TBLSN, TBLU, TBLUN).
The following MC68020 instructions are not implemented on the CPU32:
BFxxx — Bit Field Instructions (BFCHG, BFCLR, BFEXTS,
BFEXTU, BFFFO, BFINS, BFSET, BFTST)
CALLM, RTM — Call Module, Return Module
CAS, CAS2 — Compare and Swap (Read-Modify-Write Instructions)
cpxxx — Coprocessor Instructions (cpBcc, cpDBcc, cpGEN,
cpRESTORE, cpSAVE, cpScc, cpTRAPcc)
PACK, UNPK — Pack, Unpack BCD Instructions
Memory — Memory Indirect Addressing Modes
The CPU32 traps on unimplemented instructions or illegal effective addressing
modes, allowing user-supplied code to emulate unimplemented capabilities or to de-
fine special purpose functions. However, Freescale reserves the right to use all current-
ly unimplemented instruction operation codes for future M68000 core enhancements.
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Table 5-1 Instruction Set Summary
Instruction Syntax Operand Size Operation
ABCD Dn, Dn
– (An), – (An)
8
8
Source10 + Destination10+ X ⇒ Destination
ADD Dn, <ea>
<ea>, Dn
8, 16, 32
8, 16, 32
Source + Destination ⇒ Destination
ADDA <ea>, An 16, 32 Source + Destination ⇒ Destination
ADDI #<data>, <ea> 8, 16, 32 Immediate data + Destination ⇒ Destination
ADDQ #<data>, <ea> 8, 16, 32 Immediate data + Destination ⇒ Destination
ADDX Dn, Dn
– (An), – (An)
8, 16, 32
8, 16, 32
Source + Destination + X ⇒ Destination
AND <ea>, Dn
Dn, <ea>
8, 16, 32
8, 16, 32
Source · Destination ⇒ Destination
ANDI #<data>, <ea> 8, 16, 32 Data · Destination ⇒ Destination
ANDI to CCR #<data>, CCR 8 Source · CCR ⇒ CCR
ANDI to SR1#<data>, SR 16 Source · SR ⇒ SR
ASL Dn, Dn
#<data>, Dn
Í
8, 16, 32
8, 16, 32
16
ASR Dn, Dn
#<data>, Dn
Í
8, 16, 32
8, 16, 32
16
Bcc <label> 8, 16, 32 If condition true, then PC + d ⇒ PC
BCHG Dn, <ea>
#<data>, <ea>
8, 32
8, 32
(<bit number> of destination) ⇒ Z ⇒
bit of destination
BCLR Dn, <ea>
#<data>, <ea>
8, 32
8, 32
(<bit number> of destination) ⇒ Z;
0 ⇒ bit of destination
BGND none none If background mode enabled, then enter
background mode, else format/vector offset ⇒
– (SSP);
PC ⇒ – (SSP); SR ⇒ – (SSP); (vector) ⇒ PC
BKPT #<data> none If breakpoint cycle acknowledged, then execute
returned operation word, else trap as illegal
instruction.
BRA <label> 8, 16, 32 PC + d ⇒ PC
BSET Dn, <ea>
#<data>, <ea>
8, 32
8, 32
(<bit number> of destination) ⇒ Z;
1 ⇒ bit of destination
BSR <label> 8, 16, 32 SP – 4 ⇒ SP; PC ⇒ (SP); PC + d ⇒ PC
BTST Dn, <ea>
#<data>, <ea>
8, 32
8, 32
(<bit number> of destination) ⇒ Z
CHK <ea>, Dn 16, 32 If Dn < 0 or Dn < (ea), then CHK exception
CHK2 <ea>, Rn 8, 16, 32 If Rn < lower bound or Rn > upper bound, then
CHK exception
CLR Í 8, 16, 32 0 ⇒ Destination
CMP <ea>, Dn 8, 16, 32 (Destination – Source), CCR shows results
CMPA <ea>, An 16, 32 (Destination – Source), CCR shows results
CMPI #<data>, <ea> 8, 16, 32 (Destination – Data), CCR shows results
CMPA <ea>, An 16, 32 (Destination – Source), CCR shows results
CMPI #<data>, <ea> 8, 16, 32 (Destination – Data), CCR shows results
CMPM (An) +, (An) + 8, 16, 32 (Destination – Source), CCR shows results
<ea>, Rn 8, 16, 32 Lower bound ≤ Rn ≤ Upper bound, CCR shows result
X/C 0
X/C
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DBcc Dn, <label> 16 If condition false, then Dn – 1 ⇒ PC;
if Dn ∂ (– 1), then PC + d ⇒ PC
DIVS/DIVU <ea>, Dn 32/16 ⇒ 16: 16 Destination / Source ⇒ Destination
(signed or unsigned)
DIVSL/DIVUL <ea>, Dr : Dq
<ea>, Dq
<ea>, Dr : Dq
64/32 ⇒ 32 : 32
32/32 ⇒ 32
32/32 ⇒ 32 : 32
Destination / Source ⇒ Destination
(signed or unsigned)
EOR Dn, <ea> 8, 16, 32 Source x Destination ⇒ Destination
EORI #<data>, <ea> 8, 16, 32 Data x Destination ⇒ Destination
EORI to CCR #<data>, CCR 8 Source x CCR ⇒ CCR
EORI to SR1#<data>, SR 16 Source x SR ⇒ SR
EXG Rn, Rn 32 Rn ⇒ Rn
EXT Dn
Dn
8 ⇒ 16
16 ⇒ 32
Sign extended Destination ⇒ Destination
EXTB Dn 8 ⇒ 32 Sign extended Destination ⇒ Destination
ILLEGAL none none SSP – 2 ⇒ SSP; vector offset ⇒ (SSP);
SSP – 4 ⇒ SSP; PC ⇒ (SSP);
SSP – 2 ⇒ SSP; SR ⇒ (SSP);
illegal instruction vector address ⇒ PC
JMP Í none Destination ⇒ PC
JSR Í none SP – 4 ⇒ SP; PC ⇒ (SP); destination ⇒PC
LEA <ea>, An 32 <ea> ⇒ An
LINK An, #<d> 16, 32 SP – 4 ⇒ SP, An ⇒ (SP); SP ⇒ An, SP + d ⇒ SP
LPSTOP1#<data> none Data ⇒ SR; interrupt mask ⇒ EBI; STOP
LSL Dn, Dn
#<data>, Dn
Í
8, 16, 32
8, 16, 32
16
LSR Dn, Dn
#<data>, Dn
Í
8, 16, 32
8, 16, 32
16
MOVE <ea>, <ea> 8, 16, 32 Source ⇒ Destination
MOVEA <ea>, An 16, 32 ⇒ 32 Source ⇒ Destination
MOVEA1USP, An
An, USP
32
32
USP ⇒ An
An ⇒ USP
MOVE from CCR CCR, <ea> 16 CCR ⇒ Destination
MOVE to CCR <ea>, CCR 16 Source ⇒ CCR
MOVE from SR1SR, <ea> 16 SR ⇒ Destination
ROR Dn, Dn
#<data>, Dn
Í
8, 16, 32
8, 16, 32
16
ROXL Dn, Dn
#<data>, Dn
Í
8, 16, 32
8, 16, 32
16
ROXR Dn, Dn
#<data>, Dn
Í
8, 16, 32
8, 16, 32
16
RTD #<d> 16 (SP) ⇒ PC; SP + 4 + d ⇒ SP
RTE1none none (SP) ⇒ SR; SP + 2 ⇒ SP; (SP) ⇒ PC;
SP + 4 ⇒ SP;
restore stack according to format
Table 5-1 Instruction Set Summary
X/C 0
X/C
0
C
C X
CX
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NOTE:
1. Privileged instruction.
5.8.1 M68000 Family Compatibility
It is the philosophy of the M68000 family that all user-mode programs can execute un-
changed on a more advanced processor, and supervisor-mode programs and excep-
tion handlers should require only minimal alteration.
The CPU32 can be thought of as an intermediate member of the M68000 Family. Ob-
ject code from an MC68000 or MC68010 may be executed on the CPU32, and many
of the instruction and addressing mode extensions of the MC68020 are also support-
ed. Refer to the CPU32 reference manual for a detailed comparison of the CPU32 and
MC68020 instruction set.
RTR none none (SP) ⇒ CCR; SP + 2 ⇒ SP; (SP) ⇒ PC;
SP + 4 ⇒ SP
RTS none none (SP) ⇒ PC; SP + 4 ⇒ SP
SBCD Dn, Dn
– (An), – (An)
8
8
Destination10 – Source10 – X ⇒ Destination
Scc Í 8 If condition true, then destination bits are set to 1;
else, destination bits are cleared to 0
STOP1#<data> 16 Data ⇒ SR; STOP
SUB <ea>, Dn
Dn, <ea>
8, 16, 32 Destination – Source ⇒ Destination
SUBA <ea>, An 16, 32 Destination – Source ⇒ Destination
SUBI #<data>, <ea> 8, 16, 32 Destination – Data ⇒ Destination
SUBQ #<data>, <ea> 8, 16, 32 Destination – Data ⇒ Destination
SUBX Dn, Dn
– (An), – (An)
8, 16, 32
8, 16, 32
Destination – Source – X ⇒ Destination
SWAP Dn 16
TBLS/TBLU <ea>, Dn
Dym : Dyn, Dn
8, 16, 32 Dyn – Dym ⇒ Temp
(Temp * Dn [7 : 0]) ⇒ Temp
(Dym * 256) + Temp ⇒ Dn
TBLSN/TBLUN <ea>, Dn
Dym : Dyn, Dn
8, 16, 32 Dyn – Dym ⇒ Temp
(Temp * Dn [7 : 0]) / 256 ⇒ Temp
Dym + Temp ⇒ Dn
TRAP #<data> none SSP – 2 ⇒ SSP; format/vector offset ⇒ (SSP);
SSP – 4 ⇒ SSP; PC ⇒ (SSP); SR ⇒ (SSP);
vector address ⇒ PC
TRAPcc none
#<data>
none
16, 32
If cc true, then TRAP exception
TRAPV none none If V set, then overflow TRAP exception
TST Í 8, 16, 32 Source – 0, to set condition codes
UNLK An 32 An ⇒ SP; (SP) ⇒ An, SP + 4 ⇒ SP
Table 5-1 Instruction Set Summary
MSW LSW
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5.8.2 Special Control Instructions
Low power stop (LPSTOP) and table lookup and interpolate (TBL) instructions have
been added to the MC68000 instruction set for use in controller applications.
5.8.2.1 Low Power Stop (LPSTOP)
In applications where power consumption is a consideration, the CPU32 forces the de-
vice into a low power standby mode when immediate processing is not required. The
low power stop mode is entered by executing the LPSTOP instruction. The processor
remains in this mode until a user-specified (or higher) interrupt level or reset occurs.
5.8.2.2 Table Lookup and Interpolate (TBL)
To maximize throughput for real-time applications, reference data is often precalculat-
ed and stored in memory for quick access. Storage of many data points can require
an inordinate amount of memory. The table instruction requires that only a sample of
data points be stored, reducing memory requirements. The TBL instruction recovers
intermediate values using linear interpolation. Results can be rounded with a round-
to-nearest algorithm.
5.9 Exception Processing
An exception is a special condition that preempts normal processing. Exception pro-
cessing is the transition from normal mode program execution to execution of a routine
that deals with an exception.
5.9.1 Exception Vectors
An exception vector is the address of a routine that handles an exception. The vector
base register (VBR) contains the base address of a 1024-byte exception vector table,
which consists of 256 exception vectors. Sixty-four vectors are defined by the proces-
sor, and 192 vectors are reserved for user definition as interrupt vectors. Except for
the reset vector, each vector in the table is one long word in length. The reset vector
is two long words in length. Refer to Table 5-2 for information on vector assignment.
CAUTION
Because there is no protection on the 64 processor-defined vectors,
external devices can access vectors reserved for internal purposes.
This practice is strongly discouraged.
All exception vectors, except the reset vector, are located in supervisor data space.
The reset vector is located in supervisor program space. Only the initial reset vector is
fixed in the processor memory map. When initialization is complete, there are no fixed
assignments. Since the VBR stores the vector table base address, the table can be
located anywhere in memory. It can also be dynamically relocated for each task exe-
cuted by an operating system.
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Each vector is assigned an 8-bit number. Vector numbers for some exceptions are ob-
tained from an external device; others are supplied by the processor. The processor
multiplies the vector number by four to calculate vector offset, then adds the offset to
the contents of the VBR. The sum is the memory address of the vector.
5.9.2 Types of Exceptions
An exception can be caused by internal or external events.
An internal exception can be generated by an instruction or by an error. The TRAP,
TRAPcc, TRAPV, BKPT, CHK, CHK2, RTE, and DIV instructions can cause excep-
tions during normal execution. Illegal instructions, instruction fetches from odd ad-
dresses, word or long-word operand accesses from odd addresses, and privilege
violations also cause internal exceptions.
Table 5-2 Exception Vector Assignments
Vector Vector Offset Assignment
Number Dec Hex Space
0 0 000 SP Reset: Initial Stack Pointer
1 4 004 SP Reset: Initial Program Counter
2 8 008 SD Bus Error
3 12 00C SD Address Error
4 16 010 SD Illegal Instruction
5 20 014 SD Zero Division
6 24 018 SD CHK, CHK2 Instructions
7 28 01C SD TRAPcc, TRAPV Instructions
8 32 020 SD Privilege Violation
9 36 024 SD Trace
10 40 028 SD Line 1010 Emulator
11 44 02C SD Line 1111 Emulator
12 48 030 SD Hardware Breakpoint
13 52 034 SD (Reserved, Coprocessor Protocol Violation)
14 56 038 SD Format Error and Uninitialized Interrupt
15 60 03C SD Format Error and Uninitialized Interrupt
16–23 64
92
040
05C
SD (Unassigned, Reserved)
24 96 060 SD Spurious Interrupt
25 100 064 SD Level 1 Interrupt Autovector
26 104 068 SD Level 2 Interrupt Autovector
27 108 06C SD Level 3 Interrupt Autovector
28 112 070 SD Level 4 Interrupt Autovector
29 116 074 SD Level 5 Interrupt Autovector
30 120 078 SD Level 6 Interrupt Autovector
31 124 07C SD Level 7 Interrupt Autovector
32–47 128
188
080
0BC
SD Trap Instruction Vectors (0–15)
48–58 192
232
0C0
0E8
SD (Reserved, Coprocessor)
59–63 236
252
0EC
0FC
SD (Unassigned, Reserved)
64–255 256
1020
100
3FC
SD User Defined Vectors (192)
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Sources of external exception include interrupts, breakpoints, bus errors, and reset re-
quests. Interrupts are peripheral device requests for processor action. Breakpoints are
used to support development equipment. Bus error and reset are used for access con-
trol and processor restart.
5.9.3 Exception Processing Sequence
For all exceptions other than a reset exception, exception processing occurs in the fol-
lowing sequence. Refer to 4.6 Reset for details of reset processing.
As exception processing begins, the processor makes an internal copy of the status
register. After the copy is made, the processor state bits in the status register are
changed — the S bit is set, establishing supervisor access level, and bits T1 and T0
are cleared, disabling tracing. For reset and interrupt exceptions, the interrupt priority
mask is also updated.
Next, the exception number is obtained. For interrupts, the number is fetched from
CPU space $F (the bus cycle is an interrupt acknowledge). For all other exceptions,
internal logic provides a vector number.
Next, current processor status is saved. An exception stack frame is created and
placed on the supervisor stack. All stack frames contain copies of the status register
and the program counter for use by RTE. The type of exception and the context in
which the exception occurs determine what other information is stored in the stack
frame.
Finally, the processor prepares to resume normal execution of instructions. The ex-
ception vector offset is determined by multiplying the vector number by four, and the
offset is added to the contents of the VBR to determine displacement into the excep-
tion vector table. The exception vector is loaded into the program counter. If no other
exception is pending, the processor will resume normal execution at the new address
in the PC.
5.10 Development Support
The following features have been implemented on the CPU32 to enhance the instru-
mentation and development environment:
• M68000 Family Development Support
• Background Debugging Mode
• Deterministic Opcode Tracking
• Hardware Breakpoints
5.10.1 M68000 Family Development Support
All M68000 Family members include features to facilitate applications development.
These features include the following:
Trace on Instruction Execution — M68000 Family processors include an instruction-
by-instruction tracing facility as an aid to program development. The MC68020,
MC68030, MC68040, and CPU32 also allow tracing only of those instructions
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5-16 USER’S MANUAL
causing a change in program flow. In the trace mode, a trace exception is gener-
ated after an instruction is executed, allowing a debugger program to monitor the
execution of a program under test.
Breakpoint Instruction — An emulator may insert software breakpoints into the target
code to indicate when a breakpoint has occurred. On the MC68010, MC68020,
MC68030, and CPU32, this function is provided via illegal instructions, $4848–
$484F, to serve as breakpoint instructions.
Unimplemented Instruction Emulation — During instruction execution, when an at-
tempt is made to execute an illegal instruction, an illegal instruction exception oc-
curs. Unimplemented instructions (F-line, A-line,...) utilize separate exception
vectors to permit efficient emulation of unimplemented instructions in software.
5.10.2 Background Debugging Mode
Microcomputer systems generally provide a debugger, implemented in software, for
system analysis at the lowest level. The background debugging mode (BDM) on the
CPU32 is unique in that the debugger has been implemented in CPU microcode.
BDM incorporates a full set of debugging options: registers can be viewed or altered,
memory can be read or written to, and test features can be invoked.
A resident debugger simplifies implementation of an in-circuit emulator. In a common
setup (see Figure 5-7), emulator hardware replaces the target system processor. A
complex, expensive pod-and-cable interface provides a communication path between
the target system and the emulator.
By contrast, an integrated debugger supports use of a bus state analyzer (BSA) for in-
circuit emulation. The processor remains in the target system (see Figure 5-8) and the
interface is simplified. The BSA monitors target processor operation and the on-chip
debugger controls the operating environment. Emulation is much “closer” to target
hardware, and many interfacing problems (e.g., limitations on high-frequency opera-
tion, AC and DC parametric mismatches, and restrictions on cable length) are mini-
mized.
Figure 5-7 Common in-Circuit Emulator Diagram
1128A
TARGET
SYSTEM
IN-CIRCUIT
EMULATOR
TARGET
MCU
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Figure 5-8 Bus State Analyzer Configuration
5.10.2.1 Enabling BDM
Accidentally entering BDM in a non-development environment can lock up the CPU32
when the serial command interface is not available. For this reason, BDM is enabled
during reset via the breakpoint (BKPT) signal.
BDM operation is enabled when BKPT is asserted (low), at the rising edge of RESET.
BDM remains enabled until the next system reset. A high BKPT signal on the trailing
edge of RESET disables BDM. BKPT is latched again on each rising transition of RE-
SET. BKPT is synchronized internally, and must be held low for at least two clock cy-
cles prior to negation of RESET.
BDM enable logic must be designed with special care. If hold time on BKPT extends
into the first bus cycle following reset, the bus cycle could inadvertently be tagged with
a breakpoint. Refer to the
SIM Reference Manual
(SIMRM/AD) for timing information.
5.10.2.2 BDM Sources
When BDM is enabled, any of several sources can cause the transition from normal
mode to BDM. These sources include external breakpoint hardware, the BGND in-
struction, a double bus fault, and internal peripheral breakpoints. If BDM is not enabled
when an exception condition occurs, the exception is processed normally. Table 5-3
summarizes the processing of each source for both enabled and disabled cases. As
shown in Table 5-3, the BKPT instruction never causes a transition into BDM.
Table 5-3 BDM Source Summary
Source BDM Enabled BDM Disabled
BKPT Background Breakpoint Exception
Double Bus Fault Background Halted
BGND Instruction Background Illegal Instruction
BKPT Instruction Opcode Substitution/
Illegal Instruction
Opcode Substitution/
Illegal Instruction
1129A
TARGET
SYSTEM
BUS STATE
ANALYZER
TARGET
MCU
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5.10.2.2.1 External BKPT Signal
Once enabled, BDM is initiated whenever assertion of BKPT is acknowledged. If BDM
is disabled, a breakpoint exception (vector $0C) is acknowledged. The BKPT input has
the same timing relationship to the data strobe trailing edge as does read cycle data.
There is no breakpoint acknowledge bus cycle when BDM is entered.
5.10.2.2.2 BGND Instruction
An illegal instruction, $4AFA, is reserved for use by development tools. The CPU32
defines $4AFA (BGND) to be a BDM entry point when BDM is enabled. If BDM is dis-
abled, an illegal instruction trap is acknowledged.
5.10.2.2.3 Double Bus Fault
The CPU32 normally treats a double bus fault, or two bus faults in succession, as a
catastrophic system error, and halts. When this condition occurs during initial system
debug (a fault in the reset logic), further debugging is impossible until the problem is
corrected. In BDM, the fault can be temporarily bypassed, so that the origin of the fault
can be isolated and eliminated.
5.10.2.2.4 Peripheral Breakpoints
CPU32 peripheral breakpoints are implemented in the same way as external break-
points — peripherals request breakpoints by asserting the BKPT signal. Consult the
appropriate peripheral user's manual for additional details on the generation of periph-
eral breakpoints.
5.10.2.3 Entering BDM
When the processor detects a breakpoint or a double bus fault, or decodes a BGND
instruction, it suspends instruction execution and asserts the FREEZE output. This is
the first indication that the processor has entered BDM. Once FREEZE has been as-
serted, the CPU enables the serial communication hardware and awaits a command.
The CPU writes a unique value indicating the source of BDM transition into temporary
register A (ATEMP) as part of the process of entering BDM. A user can poll ATEMP
and determine the source (see Table 5-4) by issuing a read system register command
(RSREG). ATEMP is used in most debugger commands for temporary storage — it is
imperative that the RSREG command be the first command issued after transition into
BDM.
*Special status word (SSW) is described in detail in the
CPU32 Reference Manual
(CPU32RM/AD).
Table 5-4 Polling the BDM Entry Source
Source ATEMP[31:16] ATEMP[15:0]
Double Bus Fault SSW* $FFFF
BGND Instruction $0000 $0001
Hardware Breakpoint $0000 $0000
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A double bus fault during initial stack pointer/program counter (SP/PC) fetch sequence
is distinguished by a value of $FFFFFFFF in the current instruction PC. At no other
time will the processor write an odd value into this register.
5.10.2.4 BDM Commands
Commands consist of one 16-bit operation word and can include one or more 16-bit
extension words. Each incoming word is read as it is assembled by the serial interface.
The microcode routine corresponding to a command is executed as soon as the com-
mand is complete. Result operands are loaded into the output shift register to be shift-
ed out as the next command is read. This process is repeated for each command until
the CPU returns to normal operating mode. Table 5-5 is a summary of background
mode commands.
Table 5-5 Background Mode Command Summary
Command Mnemonic Description
Read D/A Register RDREG/RAREG Read the selected address or data register and
return the results via the serial interface.
Write D/A Register WDREG/WAREG The data operand is written to the specified
address or data register.
Read System Register RSREG The specified system control register is read. All
registers that can be read in supervisor mode
can be read in background mode.
Write System Register WSREG The operand data is written into the specified
system control register.
Read Memory Location READ Read the sized data at the memory location
specified by the long-word address. The
source function code register (SFC)
determines the address space accessed.
Write Memory Location WRITE Write the operand data to the memory location
specified by the long-word address. The
destination function code (DFC) register
determines the address space accessed.
Dump Memory Block DUMP Used in conjunction with the READ command to
dump large blocks of memory. An initial READ
is executed to set up the starting address of
the block and retrieve the first result.
Subsequent operands are retrieved with the
DUMP command.
Fill Memory Block FILL Used in conjunction with the WRITE command to
fill large blocks of memory. An initial WRITE is
executed to set up the starting address of the
block and supply the first operand.
Subsequent operands are written with the
FILL command.
Resume Execution GO The pipe is flushed and re-filled before resuming
instruction execution at the current PC.
Patch User Code CALL Current program counter is stacked at the
location of the current stack pointer.
Instruction execution begins at user patch
code.
Reset Peripherals RST Asserts RESET for 512 clock cycles. The CPU is
not reset by this command. Synonymous with
the CPU RESET instruction.
No Operation NOP NOP performs no operation and may be used as
a null command.
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5.10.2.5 Background Mode Registers
BDM processing uses three special purpose registers to keep track of program context
during development. A description of each follows.
5.10.2.5.1 Fault Address Register (FAR)
The FAR contains the address of the faulting bus cycle immediately following a bus or
address error. This address remains available until overwritten by a subsequent bus
cycle. Following a double bus fault, the FAR contains the address of the last bus cycle.
The address of the first fault (if there was one) is not visible to the user.
5.10.2.5.2 Return Program Counter (RPC)
The RPC points to the location where fetching will commence after transition from
background mode to normal mode. This register should be accessed to change the
flow of a program under development. Changing the RPC to an odd value will cause
an address error when normal mode prefetching begins.
5.10.2.5.3 Current Instruction Program Counter (PCC)
The PCC holds a pointer to the first word of the last instruction executed prior to tran-
sition into background mode. Due to instruction pipelining, the instruction pointed to
may not be the instruction which caused the transition. An example is a breakpoint on
a released write. The bus cycle may overlap as many as two subsequent instructions
before stalling the instruction sequencer. A breakpoint asserted during this cycle will
not be acknowledged until the end of the instruction executing at completion of the bus
cycle. PCC will contain $00000001 if BDM is entered via a double bus fault immedi-
ately out of reset.
5.10.2.6 Returning from BDM
BDM is terminated when a resume execution (GO) or call user code (CALL) command
is received. Both GO and CALL flush the instruction pipeline and refetch instructions
from the location pointed to by the RPC.
The return PC and the memory space referred to by the status register SUPV bit reflect
any changes made during BDM. FREEZE is negated prior to initiating the first
prefetch. Upon negation of FREEZE, the serial subsystem is disabled, and the signals
revert to IPIPE/IFETCH functionality.
5.10.2.7 Serial Interface
Communication with the CPU32 during BDM occurs via a dedicated serial interface,
which shares pins with other development features. Figure 5-9 is a block diagram of
the interface. The BKPT signal becomes the serial clock (DSCLK); serial input data
(DSI) is received on IFETCH, and serial output data (DSO) is transmitted on IPIPE.
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Figure 5-9 Debug Serial I/O Block Diagram
The serial interface uses a full-duplex synchronous protocol similar to the serial pe-
ripheral interface (SPI) protocol. The development system serves as the master of the
serial link since it is responsible for the generation of DSCLK. If DSCLK is derived from
the CPU32 system clock, development system serial logic is unhindered by the oper-
ating frequency of the target processor. Operable frequency range of the serial clock
is from DC to one-half the processor system clock frequency.
The serial interface operates in full-duplex mode — data is transmitted and received
simultaneously by both master and slave devices. In general, data transitions occur on
the falling edge of DSCLK and are stable by the following rising edge of DSCLK. Data
is transmitted MSB first, and is latched on the rising edge of DSCLK.
The serial data word is 17 bits wide — 16 data bits and a status/control bit. Bit 16 in-
dicates the status of CPU-generated messages as shown in Table 5-6.
CONTROL
LOGIC
SERIAL IN
PARALLEL OUT
PARALLEL IN
SERIAL OUT
EXECUTION
UNIT
STATUS
SYNCHRONIZE
MICROSEQUENCER
PARALLEL IN
SERIAL OUT
SERIAL IN
PARALLEL OUT
RESULT LATCH
CONTROL
LOGIC
STATUS DATA
DSI
DSO
DSCLK SERIAL
CLOCK
16
16
RCV DATA LATCH
CPU INSTRUCTION
REGISTER BUS
16
COMMAND LATCH
DATA
16
0
M
DEVELOPMENT SYSTEM
32 DEBUG I/O BLOCK
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Figure 5-10 BDM Serial Data Word
Command and data transfers initiated by the development system should clear bit 16.
The current implementation ignores this bit; however, Freescale reserves the right to
use this bit for future enhancements.
5.10.3 Recommended BDM Connection
In order to provide for use of development tools when an MCU is installed in a system,
Freescale recommends that appropriate signal lines be routed to a male Berg connec-
tor or double-row header installed on the circuit board with the MCU, as shown in the
following figure.
Figure 5-11 BDM Connector Pinout
5.10.4 Deterministic Opcode Tracking
CPU32 function code outputs are augmented by two supplementary signals to monitor
the instruction pipeline. The instruction pipe (IPIPE) output indicates the start of each
new instruction and each mid-instruction pipeline advance. The instruction fetch (IF-
ETCH) output identifies the bus cycles in which the operand is loaded into the instruc-
tion pipeline. Pipeline flushes are also signaled with IFETCH. Monitoring these two
signals allows a bus analyzer to synchronize itself to the instruction stream and mon-
itor its activity.
16 15 0
S/C DATA FIELD
⇑
STATUS CONTROL BIT
Table 5-6 CPU Generated Message Encoding
Bit 16 Data Message Type
0 xxxx Valid Data Transfer
0 FFFF Command Complete; Status OK
1 0000 Not Ready with Response; Come Again
1 0001 BERR Terminated Bus Cycle; Data Invalid
1 FFFF Illegal Command
32 BERG
DS
GND
GND
RESET
VDD
BERR
BKPT/DSCLK
FREEZE
IFETCH/DSI
IPIPE/DSO
1
3
5
7
9
2
4
6
8
10
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5.10.5 On-Chip Breakpoint Hardware
An external breakpoint input and on-chip breakpoint hardware allow a breakpoint trap
on any memory access. Off-chip address comparators preclude breakpoints unless
show cycles are enabled. Breakpoints on instruction prefetches that are ultimately
flushed from the instruction pipeline are not acknowledged; operand breakpoints are
always acknowledged. Acknowledged breakpoints initiate exception processing at the
address in exception vector number 12, or alternately enter background mode.
5.11 Loop Mode Instruction Execution
The CPU32 has several features that provide efficient execution of program loops.
One of these features is the DBcc looping primitive instruction. To increase the perfor-
mance of the CPU32, a loop mode has been added to the processor. The loop mode
is used by any single word instruction that does not change the program flow. Loop
mode is implemented in conjunction with the DBcc instruction. Figure 5-12 shows the
required form of an instruction loop for the processor to enter loop mode.
Figure 5-12 Loop Mode Instruction Sequence
The loop mode is entered when the DBcc instruction is executed, and the loop dis-
placement is –4. Once in loop mode, the processor performs only the data cycles as-
sociated with the instruction and suppresses all instruction fetches. The termination
condition and count are checked after each execution of the data operations of the
looped instruction. The CPU32 automatically exits the loop mode on interrupts or other
exceptions. All single word instructions that do not cause a change of flow can be
looped.
ONE WORD INSTRUCTION
DBCC
DBCC DISPLACEMENT
$FFFC = – 4
1126A
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MC68332 QUEUED SERIAL MODULE
USER’S MANUAL 6-1
SECTION 6 QUEUED SERIAL MODULE
This section is an overview of queued serial module (QSM) function. Refer to the
QSM
Reference Manual
(QSMRM/AD) for complete information about the QSM.
6.1 General
The QSM contains two serial interfaces, the queued serial peripheral interface (QSPI)
and the serial communication interface (SCI). Figure 6-1 is a block diagram of the
QSM.
Figure 6-1 QSM Block Diagram
The QSPI provides easy peripheral expansion or interprocessor communication
through a full-duplex, synchronous, three-line bus. Four programmable peripheral chip
selects can select up to 16 peripheral devices. A self-contained RAM queue allows up
to sixteen serial transfers of eight to sixteen bits each or transmission of a 256-bit data
stream without CPU intervention. A special wraparound mode supports continuous
sampling of a serial peripheral, with automatic QSPI RAM updating, for efficient inter-
facing to A/D converters.
The SCI provides a standard nonreturn to zero (NRZ) mark/space format. It will oper-
ate in either full- or half-duplex mode. There are separate transmitter and receiver en-
able bits and dual data buffers. A modulus-type baud rate generator provides rates
from 64 to 524 kbaud with a 16.78-MHz system clock, or 110 to 655 kbaud with a
20.97-MHz system clock. Word length of either eight or nine bits can be selected. Op-
tional parity generation and detection provide either even or odd parity check capabil-
QSPI
INTERFACE
LOGIC
SCI
MISO/PQS0
MOSI/PQS1
SCK/PQS2
PCS0/SS/PQS3
PCS1/PQS4
PCS2/PQS5
PCS3/PQS6
TXD/PQS7
RXD
PORT QS
QSM BLOCK
IMB
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ity. Advanced error detection circuitry catches glitches of up to 1/16 of a bit time in
duration. Wakeup functions allow the CPU to run uninterrupted until meaningful data
is available.
6.2 QSM Registers and Address Map
There are four types of QSM registers: QSM global registers, QSM pin control regis-
ters, QSPI registers, and SCI registers. Global registers and pin control registers are
discussed in 6.2.1 QSM Global Registers and 6.2.2 QSM Pin Control Registers.
QSPI and SCI registers are discussed in 6.3 Queued Serial Peripheral Interface and
6.4 Serial Communication Interface. Writes to unimplemented register bits have no
meaning or effect, and reads from unimplemented bits always return a logic zero val-
ue.
The QSM address map includes the QSM registers and the QSPI RAM. The module
mapping (MM) bit in the SIM configuration register (SIMCR) defines the most signifi-
cant bit (ADDR23) of the IMB address for each module in the MCU.
Refer to APPENDIX D REGISTER SUMMARY for a QSM address map and register
bit/field definitions. SECTION 4 SYSTEM INTEGRATION MODULE contains more in-
formation about how the state of MM affects the system.
6.2.1 QSM Global Registers
The QSM configuration register (QSMCR) contains parameters for interfacing to the
CPU32 and the intermodule bus. The QSM test register (QTEST) is used during fac-
tory test of the QSM. The QSM interrupt level register (QILR) determines the priority
of interrupts requested by the QSM and the vector used when an interrupt is acknowl-
edged. The QSM interrupt vector register (QIVR) contains the interrupt vector for both
QSM submodules. QILR and QIVR are 8-bit registers located at the same word ad-
dress. Refer to APPENDIX D REGISTER SUMMARY for register bit and field defini-
tions.
6.2.1.1 Low-Power Stop Operation
When the STOP bit in the QSMCR is set, the system clock input to the QSM is disabled
and the module enters a low-power operating state. QSMCR is the only register guar-
anteed to be readable while STOP is asserted. The QSPI RAM is not readable, but
writes to RAM or any register are guaranteed valid while STOP is asserted. STOP can
be set by the CPU and by reset.
System software must stop the QSPI and SCI before asserting STOP to prevent data
corruption and simplify restart. Disable both SCI receiver and transmitter after trans-
fers in progress are complete. Halt the QSPI by setting the HALT bit in SPCR3 and
then setting STOP after the HALTA flag is set. Refer to SECTION 4 SYSTEM INTE-
GRATION MODULE for more information about low-power operation.
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6.2.1.2 Freeze Operation
The freeze (FRZ[1:0]) bits in the QSMCR are used to determine what action is taken
by the QSM when the IMB FREEZE signal is asserted. FREEZE is asserted when the
CPU enters background debugging mode. At the present time, FRZ0 has no effect;
setting FRZ1 causes the QSPI to halt on the first transfer boundary following FREEZE
assertion. Refer to SECTION 5 CENTRAL PROCESSING UNIT for more information
about background debugging mode.
6.2.1.3 QSM Interrupts
Both the QSPI and SCI can make interrupt requests on the IMB. Each has a separate
interrupt request priority register, but a single vector register is used to generate ex-
ception vector numbers.
The values of the ILQSPI and ILSCI fields in the QILR determine the priority of QSPI
and SCI interrupt requests. The values in these fields correspond to internal interrupt
request signals IRQ[7:1]. A value of %111 causes IRQ7 to be asserted when a QSM
interrupt request is made; lower field values cause corresponding lower-numbered in-
terrupt request signals to be asserted. Setting field value to %000 disables interrupts.
If ILQSPI and ILSCI have the same nonzero value, and the QSPI and SCI make simul-
taneous interrupt requests, the QSPI has priority.
When the CPU32 acknowledges an interrupt request, it places the value in the inter-
rupt priority (IP) mask in the CPU status register on the address bus. The QSM com-
pares IP mask value to request priority to determine whether it should contend for
arbitration priority. Arbitration priority is determined by the value of the IARB field in the
QSMCR. Each module that generates interrupts must have a nonzero IARB value. Ar-
bitration is performed by means of serial assertion of IARB field bit values.
When the QSM wins interrupt arbitration, it responds to the CPU interrupt acknowl-
edge cycle by placing an interrupt vector number on the data bus. The vector number
is used to calculate displacement into the CPU32 exception vector table. SCI and
QSPI vector numbers are generated from the value in the QIVR INTV field. The values
of bits INTV[7:1] are the same for QSPI and SCI, but the value of INTV0 is supplied by
the QSM when an interrupt request is made. INTV0 = 0 for SCI interrupt requests;
INTV0 = 1 for QSPI requests.
At reset, INTV is initialized to $0F, the uninitialized interrupt vector number. To enable
interrupt-driven serial communication, a user-defined vector number ($40–$FF) must
be written to QIVR, and interrupt handler routines must be located at the addresses
pointed to by the corresponding vector. CPU writes to INTV0 have no meaning or ef-
fect. Reads of INTV0 return a value of one.
Refer to SECTION 5 CENTRAL PROCESSING UNIT and SECTION 4 SYSTEM IN-
TEGRATION MODULE for more information about exceptions and interrupts.
6.2.2 QSM Pin Control Registers
The QSM uses nine pins. Eight of the pins can be used for serial communication or for
parallel I/O. Clearing a bit in the port QS pin assignment register (PQSPAR) assigns
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6-4 USER’S MANUAL
the corresponding pin to general-purpose I/O; setting a bit assigns the pin to the QSPI.
PQSPAR does not affect operation of the SCI.
The port QS data direction register (DDRQS) determines whether pins are inputs or
outputs. Clearing a bit makes the corresponding pin an input; setting a bit makes the
pin an output. DDRQS affects both QSPI function and I/O function. DDQS1 deter-
mines the direction of the TXD pin only when the SCI transmitter is disabled. When the
SCI transmitter is enabled, the TXD pin is an output. PQSPAR and DDRQS are 8-bit
registers located at the same word address. Table 6-1 is a summary of QSM pin func-
tions.
The port QS data register (PORTQS) latches I/O data. Writes to PORTQS drive pins
defined as outputs. PORTQS reads return data present on the pins when the read is
made. To avoid driving undefined data, first write PORTQS, then configure DDRQS.
6.3 Queued Serial Peripheral Interface
The queued serial peripheral interface (QSPI) communicates with external devices
through a synchronous serial bus. The QSPI is fully compatible with SPI systems
found on other Freescale products, but has enhanced capabilities. The QSPI can per-
NOTES:
1. PQS2 is a digital I/O pin unless the SPI is enabled (SPE in SPCR1 set), in which case it becomes the SPI
serial clock SCK.
2. PQS7 is a digital I/O pin unless the SCI transmitter is enabled (TE in SCCR1 set), in which case it becomes
SCI serial output TXD and DDRQS has no effect.
Table 6-1 QSM Pin Function
QSM Pin Mode DDRQS Bit Bit State Pin Function
MISO Master DDQS0 0 Serial Data Input to QSPI
1 Disables Data Input
Slave 0 Disables Data Output
1 Serial Data Output from QSPI
MOSI Master DDQS1 0 Disables Data Output
1 Serial Data Output from QSPI
Slave 0 Serial Data Input to QSPI
1 Disables Data Input
SCK1Master DDQS2 0 Disables Clock Output
1 Clock Output from QSPI
Slave 0 Clock Input to QSPI
1 Disables Clock Input
PCS0/SS Master DDQS3 0 Assertion Causes Mode Fault
1 Chip-Select Output
Slave 0 QSPI Slave Select Input
1 Disables Select Input
PCS[3:1] Master DDQS[4:6] 0 Disables Chip-Select Output
1 Chip-Select Output
Slave 0 Inactive
1 Inactive
TXD2Transmit DDQS7 X Serial Data Output from SCI
RXD Receive None NA Serial Data Input to SCI
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USER’S MANUAL 6-5
form full duplex three-wire or half duplex two-wire transfers. A variety of transfer rate,
clocking, and interrupt-driven communication options are available.
Serial transfer of any number of bits from eight to sixteen can be specified. Program-
mable transfer length simplifies interfacing to a number of devices that require different
data lengths.
An inter-transfer delay of 17 to 8192 system clocks can be specified (default is 17 sys-
tem clocks). Programmable delay simplifies the interface to a number of devices that
require different delays between transfers.
A dedicated 80-byte RAM is used to store received data, data to be transmitted, and
a queue of commands. The CPU can access these locations directly. Serial peripher-
als can be treated like memory-mapped parallel devices.
The command queue allows the QSPI to perform up to 16 serial transfers without CPU
intervention. Each queue entry contains all the information needed by the QSPI to in-
dependently complete one serial transfer.
A pointer identifies the queue location containing the command for the next serial
transfer. Normally, the pointer address is incremented after each serial transfer, but
the CPU can change the pointer value at any time. Multiple-task support can be pro-
vided by segmenting the queue.
The QSPI has four peripheral chip-select pins. Chip-select signals simplify interfacing
by reducing CPU intervention. If chip-select signals are externally decoded, 16 inde-
pendent select signals can be generated. Each chip-select pin can drive up to four in-
dependent peripherals, depending on loading.
Wraparound operating mode allows continuous execution of queued commands. In
wraparound mode, newly received data replaces previously received data in receive
RAM. Wraparound can simplify the interface with A/D converters by continuously up-
dating conversion values stored in the RAM.
Continuous transfer mode allows simultaneous transfer of an uninterrupted bit stream.
Any number of bits in a range from 8 to 256 can be transferred without CPU interven-
tion. Longer transfers are possible, but minimal CPU intervention is required to prevent
loss of data. A standard delay of 17 system clocks is inserted between each queue
entry transfer.
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6-6 USER’S MANUAL
Figure 6-2 QSPI Block Diagram
6.3.1 QSPI Registers
The programmer's model for the QSPI consists of the QSM global and pin control reg-
isters, four QSPI control registers (SPCR[0:3]), a status register (SPCR), and the 80-
byte QSPI RAM.
Registers and RAM can be read and written by the CPU. Refer to APPENDIX D REG-
ISTER SUMMARY for register bit and field definitions.
QSPI BLOCK
CONTROL
REGISTERS
END QUEUE
POINTER
QUEUE
POINTER
STATUS
REGISTER
DELAY
COUNTER
COMPARATOR
PROGRAMMABLE
LOGIC ARRAY
80-BYTE
QSPI RAM
CHIP SELECT
COMMAND
DONE
4
4
3
BAUD RATE
GENERATOR
PCS [3:1]
PCS0/SS
MISO
MOSI
SCK
M
S
M
S
8/16-BIT SHIFT REGISTER
Rx/Tx DATA REGISTER
MSB LSB
4
QUEUE CONTROL
BLOCK
CONTROL
LOGIC
ADDRESS
REGISTER
4
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MC68332 QUEUED SERIAL MODULE
USER’S MANUAL 6-7
6.3.1.1 Control Registers
Control registers contain parameters for configuring the QSPI and enabling various
modes of operation. The CPU has read and write access to all control registers, but
the QSM has read-only access to all bits except the SPE bit in SPCR1. Control regis-
ters must be initialized before the QSPI is enabled to ensure defined operation.
SPCR1 must be written last because it contains the QSPI enable bit (SPE).
Writing a new value to any control register except SPCR2 while the QSPI is enabled
disrupts operation. SPCR2 is buffered. New SPCR2 values become effective after
completion of the current serial transfer. Rewriting NEWQP in SPCR2 causes execu-
tion to restart at the designated location. Reads of SPCR2 return the current value of
the register, not of the buffer.
Writing the same value into any control register except SPCR2 while the QSPI is en-
abled has no effect on QSPI operation.
6.3.1.2 Status Register
The QSPI status register (SPSR) contains information concerning the current serial
transmission. Only the QSPI can set the bits in this register. The CPU reads the SPSR
to obtain QSPI status information and writes it to clear status flags.
6.3.2 QSPI RAM
The QSPI contains an 80-byte block of dual-access static RAM that can be accessed
by both the QSPI and the CPU. The RAM is divided into three segments: receive data
RAM, transmit data RAM, and command control data RAM. Receive data is informa-
tion received from a serial device external to the MCU. Transmit data is information
stored by the CPU for transmission to an external device. Command control data is
used to perform transfers. Refer to Figure 6-3, which shows RAM organization.
6.3.2.1 Receive RAM
Data received by the QSPI is stored in this segment. The CPU reads this segment to
retrieve data from the QSPI. Data stored in receive RAM is right-justified. Unused bits
in a receive queue entry are set to zero by the QSPI upon completion of the individual
queue entry. The CPU can access the data using byte, word, or long-word addressing.
The CPTQP value in SPSR shows which queue entries have been executed. The CPU
uses this information to determine which locations in receive RAM contain valid data
before reading them.
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6-8 USER’S MANUAL
Figure 6-3 QSPI RAM
6.3.2.2 Transmit RAM
Data that is to be transmitted by the QSPI is stored in this segment. The CPU normally
writes one word of data into this segment for each queue command to be executed.
Information to be transmitted must be written to transmit RAM in a right-justified for-
mat. The QSPI cannot modify information in the transmit RAM. The QSPI copies the
information to its data serializer for transmission. Information remains in transmit RAM
until overwritten.
6.3.2.3 Command RAM
Command RAM is used by the QSPI in master mode. The CPU writes one byte of con-
trol information to this segment for each QSPI command to be executed. The QSPI
cannot modify information in command RAM.
Command RAM consists of 16 bytes. Each byte is divided into two fields. The periph-
eral chip-select field enables peripherals for transfer. The command control field pro-
vides transfer options.
A maximum of 16 commands can be in the queue. Queue execution by the QSPI pro-
ceeds from the address in NEWQP through the address in ENDQP (both of these
fields are in SPCR2).
6.3.3 QSPI Pins
The QSPI uses seven pins. These pins can be configured for general-purpose I/O
when not needed for QSPI application. When used for QSPI functions, the MOSI, MI-
SO, and SS pins should have pull-up resistors.
Table 6-2 shows QSPI input and output pins and their functions.
QSPI RAM MAP
RECEIVE
RAM TRANSMIT
RAM
D00
D1E
D20
D3E
WORD
D40
D4F
COMMAND
RAM
BYTEWORD
RR0
RR1
RR2
RRD
RRE
RRF
TR0
TR1
TR2
TRD
TRE
TRF
CR0
CR1
CR2
CRD
CRE
CRF
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MC68332 QUEUED SERIAL MODULE
USER’S MANUAL 6-9
6.3.4 QSPI Operation
The QSPI uses a dedicated 80-byte block of static RAM accessible by both the QSPI
and the CPU to perform queued operations. The RAM is divided into three segments.
There are 16 command control bytes, 16 transmit data words, and 16 receive data
words. QSPI RAM is organized so that one byte of command control data, one word
of transmit data, and one word of receive data correspond to one queue entry, $0–$F.
The CPU initiates QSPI operation by setting up a queue of QSPI commands in com-
mand RAM, writing transmit data into transmit RAM, then enabling the QSPI. The
QSPI executes the queued commands, sets a completion flag (SPIF), and then either
interrupts the CPU or waits for CPU intervention.
There are four queue pointers. The CPU can access three of them through fields in
QSPI registers. The new queue pointer (NEWQP), in SPCR2, points to the first com-
mand in the queue. An internal queue pointer points to the command currently being
executed. The completed queue pointer (CPTQP), in SPSR, points to the last com-
mand executed. The end queue pointer (ENDQP), contained in SPCR2, points to the
final command in the queue.
The internal pointer is initialized to the same value as NEWQP. During normal opera-
tion, the command pointed to by the internal pointer is executed, the value in the inter-
nal pointer is copied into CPTQP, the internal pointer is incremented, and then the
sequence repeats. Execution continues at the internal pointer address unless the
NEWQP value is changed. After each command is executed, ENDQP and CPTQP are
compared. When a match occurs, the SPIF flag is set and the QSPI stops unless wrap-
around mode is enabled.
At reset, NEWQP is initialized to $0. When the QSPI is enabled, execution begins at
queue address $0 unless another value has been written into NEWQP. ENDQP is ini-
tialized to $0 at reset, but should be changed to show the last queue entry before the
QSPI is enabled. NEWQP and ENDQP can be written at any time. When the NEWQP
value changes, the internal pointer value also changes. However, if NEWQP is written
while a transfer is in progress, the transfer is completed normally. Leaving NEWQP
and ENDQP set to $0 causes a single transfer to occur when the QSPI is enabled.
Table 6-2 QSPI Pin Function
Pin/Signal Name Mnemonic Mode Function
Master In Slave Out MISO Master
Slave
Serial Data Input to QSPI
Serial Data Output from QSPI
Master Out Slave In MOSI Master
Slave
Serial Data Output from QSPI
Serial Data Input to QSPI
Serial Clock SCK Master
Slave
Clock Output from QSPI
Clock Input to QSPI
Peripheral Chip Selects PCS[3:1] Master Select Peripherals
Slave Select SS Master
Slave
Causes Mode Fault
Peripheral Chip Select 0 PCS0 Master Initiates Serial Transfer
Selects Peripherals
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6-10 USER’S MANUAL
6.3.5 QSPI Operating Modes
The QSPI operates in either master or slave mode. Master mode is used when the
MCU originates data transfers. Slave mode is used when an external device initiates
serial transfers to the MCU through the QSPI. Switching between the modes is con-
trolled by MSTR in SPCR0. Before either mode is entered, appropriate QSM and QSPI
registers must be initialized properly.
In. master mode, the QSPI executes a queue of commands defined by control bits in
each command RAM queue entry. Chip-select pins are activated, data is transmitted
from transmit RAM and received by the receive RAM.
In slave mode, operation proceeds in response to SS pin activation by an external bus
master. Operation is similar to master mode, but no peripheral chip selects are gener-
ated, and the number of bits transferred is controlled in a different manner. When the
QSPI is selected, it automatically executes the next queue transfer to exchange data
with the external device correctly.
Although the QSPI inherently supports multimaster operation, no special arbitration
mechanism is provided. A mode fault flag (MODF) indicates a request for SPI master
arbitration. System software must provide arbitration. Note that unlike previous SPI
systems, MSTR is not cleared by a mode fault being set nor are the QSPI pin output
drivers disabled. The QSPI and associated output drivers must be disabled by clearing
SPE in SPCR1.
Figure 6-4 shows QSPI initialization; Figure 6-5 and Figure 6-5 show QSPI master
and slave operation. The CPU must initialize the QSM global and pin registers and the
QSPI control registers before enabling the QSPI for either mode of operation (refer to
6.5 QSM Initialization). The command queue must be written before the QSPI is en-
abled for master mode operation. Any data to be transmitted should be written into
transmit RAM before the QSPI is enabled. During wraparound operation, data for sub-
sequent transmissions can be written at any time.
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USER’S MANUAL 6-11
Figure 6-4 Flowchart of QSPI Initialization Operation
CPU INITIALIZES
QSM GLOBAL REGISTERS
CPU INITIALIZES
QSPI CONTROL REGISTERS
CPU INITIALIZES
QSM PIN REGISTERS
CPU INITIALIZES
QSPI RAM
CPU ENABLES QSPI
BEGIN
A2
INITIALIZATION OF
QSPI BY THE CPU
MSTR = 1
A1
YES
NO
QSPI FLOW 1
?
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6-12 USER’S MANUAL
Figure 6-5 Flowchart of QSPI Master Operation (Part 1)
READ COMMAND CONTROL
AND TRANSMIT DATA
FROM RAM USING QUEUE
POINTER ADDRESS
A1
WORKING QUEUE POINTER
CHANGED TO NEWQP
IS QSPI
DISABLED
NO
YES
EXECUTE SERIAL TRANSFER
STORE RECEIVED DATA
IN RAM USING QUEUE
POINTER ADDRESS
B1
QSPI CYCLE BEGINS
(MASTER MODE)
YES
ASSERT PERIPHERAL
CHIP-SELECT(S)
IS PCS TO
SCK DELAY
PROGRAMMED
EXECUTE STANDARD DELAY
YES EXECUTE PROGRAMMED DELAY
HAS NEWQP
BEEN WRITTEN
QSPI FLOW 2
?
NO
NO
?
?
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MC68332 QUEUED SERIAL MODULE
USER’S MANUAL 6-13
Figure 6-5 Flowchart of QSPI Master Operation (Part 2)
READ TRANSMIT DATA
FROM RAM USING QUEUE
POINTER ADDRESS
A2
QUEUE POINTER
CHANGED TO NEWQP
NO
WRITE QUEUE POINTER TO
CPTQP STATUS BITS
STORE RECEIVED DATA
IN RAM USING QUEUE
POINTER ADDRESS
B2
QSPI CYCLE BEGINS
(SLAVE MODE)
YES
EXECUTE SERIAL TRANSFER
WHEN SCK RECEIVED
IS SLAVE
SELECT PIN
ASSERTED
HAS NEWQP
BEEN WRITTEN
IS QSPI
DISABLED
QSPI FLOW 3
?
YES
NO
?
?
YES
NO
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6-14 USER’S MANUAL
Figure 6-5 Flowchart of QSPI Master Operation (Part 3)
IS DELAY
AFTER TRANSFER
ASSERTED EXECUTE PROGRAMMED DELAY
B1
WRITE QUEUE POINTER
TO CPTQP STATUS BITS
C
NEGATE PERIPHERAL
CHIP-SELECT(S)
YES
NO
IS CONTINUE
BIT ASSERTED
EXECUTE STANDARD DELAY
QSPI FLOW 4
?
YES
?
NO
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USER’S MANUAL 6-15
Figure 6-6 Flowchart of QSPI Slave Operation (Part 1)
READ TRANSMIT DATA
FROM RAM USING QUEUE
POINTER ADDRESS
B2
QUEUE POINTER
CHANGED TO NEWQP
NO
WRITE QUEUE POINTER TO
CPTQP STATUS BITS
STORE RECEIVED DATA
IN RAM USING QUEUE
POINTER ADDRESS
C
YES
EXECUTE SERIAL TRANSFER
WHEN SCK RECEIVED
IS SLAVE
SELECT PIN
ASSERTED
HAS NEWQP
BEEN WRITTEN
IS QSPI
DISABLED
QSPI FLOW 5
?
YES
NO
?
?
YES
NO
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6-16 USER’S MANUAL
Figure 6-6 Flowchart of QSPI Slave Operation (Part 2)
ASSERT SPIF
STATUS FLAG
INTERRUPT CPU
IS INTERRUPT
ENABLE BIT SPIFIE
ASSERTED
IS WRAP
ENABLE BIT
ASSERTED
YES
NO
RESET WORKING QUEUE
POINTER TO NEWQP OR $0000
DISABLE QSPI
A1
INCREMENT WORKING
QUEUE POINTER
IS HALT
OR FREEZE
ASSERTED
A2
HALT QSPI AND
ASSERT HALTA
IS INTERRUPT
ENABLE BIT HMIE
ASSERTED INTERRUPT CPU
IS HALT
OR FREEZE
ASSERTED
C
IS THIS THE
LAST COMMAND
IN THE QUEUE
QSPI FLOW 6
?
?
?
YES
NO
?
?
?
YES
YES
NO
NO
YES
NO
YES
NO
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USER’S MANUAL 6-17
Normally, the SPI bus performs synchronous bidirectional transfers. The serial clock
on the SPI bus master supplies the clock signal (SCK) to time the transfer of data. Four
possible combinations of clock phase and polarity can be specified by the CPHA and
CPOL bits in SPCR0.
Data is transferred with the most significant bit first. The number of bits transferred per
command defaults to eight, but can be set to any value from eight to sixteen bits by
writing a value into the BITSE field in command RAM.
Typically, SPI bus outputs are not open-drain unless multiple SPI masters are in the
system. If needed, the WOMQ bit in SPCR0 can be set to provide wired-OR, open-
drain outputs. An external pull-up resistor should be used on each output line. WOMQ
affects all QSPI pins regardless of whether they are assigned to the QSPI or used as
general-purpose I/O.
6.3.5.1 Master Mode
Setting the MSTR bit in SPCR0 selects master mode operation. In master mode, the
QSPI can initiate serial transfers, but cannot respond to externally initiated transfers.
When the slave select input of a device configured for master mode is asserted, a
mode fault occurs.
Before QSPI operation is initiated, QSM register PQSPAR must be written to assign
necessary pins to the QSPI. The pins necessary for master mode operation are MISO
and MOSI, SCK, and one or more of the chip-select pins. MISO is used for serial data
input in master mode, and MOSI is used for serial data output. Either or both may be
necessary, depending on the particular application. SCK is the serial clock output in
master mode.
Before master mode operation is initiated, QSM register DDRQS must be written to
direct the data flow on the QSPI pins used. Configure the SCK, MOSI and appropriate
chip-select pins PCS[3:0]/SS as outputs. The MISO pin must be configured as an in-
put.
After pins are assigned and configured, write appropriate data to the command queue.
If data is to be transmitted, write the data to transmit RAM. Initialize the queue pointers
as appropriate.
Data transfer is synchronized with the internally-generated serial clock (SCK). Control
bits, CPHA and CPOL, in SPCR0, control clock phase and polarity. Combinations of
CPHA and CPOL determine upon which SCK edge to drive outgoing data from the
MOSI pin and to latch incoming data from the MISO pin.
Baud rate is selected by writing a value from 2 to 255 into the SPBR field in SPCR0.
The QSPI uses a modulus counter to derive SCK baud rate from the MCU system
clock.
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6-18 USER’S MANUAL
The following expressions apply to SCK baud rate:
or
Giving SPBR a value of zero or one disables the baud rate generator. SCK is disabled
and assumes its inactive state value.
The DSCK field in command RAM determines the delay period from chip-select asser-
tion until the leading edge of the serial clock. The DSCKL field in SPCR1 determines
the period of delay before the assertion of SCK. The following expression determines
the actual delay before SCK:
where DSCKL equals {1, 2, 3,..., 127}.
When DSCK equals zero, DSCKL is not used. Instead, the PCS valid-to-SCK transi-
tion is one-half the DSCK period.
There are two transfer length options. The user can choose a default value of eight
bits, or a programmed value of eight to sixteen bits, inclusive. The programmed value
must be written into the BITS field in SPCR0. The BITSE field in command RAM de-
termines whether the default value (BITSE = 0) or the BITS value (BITSE = 1) is used.
Table 6-3 shows BITS field encoding.
SCK Baud Rate System Clock
2 SPBR×
------------------------------------=
SPBR System Clock
2 SCK×()Baud Rate Desired()
----------------------------------------------------------------------------------=
PCS to SCK Delay DSCKL
System Clock Frequency
------------------------------------------------------------------=
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USER’S MANUAL 6-19
Delay after transfer can be used to provide a peripheral deselect interval. A delay can
also be inserted between consecutive transfers to allow serial A/D converters to com-
plete conversion. There are two transfer delay options. The user can choose to delay
a standard period after serial transfer is complete or can specify a delay period. Writing
a value to the DTL field in SPCR1 specifies a delay period. The DT bit in command
RAM determines whether the standard delay period (DT = 0) or the specified delay pe-
riod (DT = 1) is used. The following expression is used to calculate the delay:
where DTL equals {1, 2, 3,..., 255}.
A zero value for DTL causes a delay-after-transfer value of 8192/system clock.
Adequate delay between transfers must be specified for long data streams because
the QSPI requires time to load a transmit RAM entry for transfer. Receiving devices
need at least the standard delay between successive transfers. If the system clock is
operating at a slower rate, the delay between transfers must be increased proportion-
ately.
Operation is initiated by setting the SPE bit in SPCR1. Shortly after SPE is set, the
QSPI executes the command at the command RAM address pointed to by NEWQP.
Data at the pointer address in transmit RAM is loaded into the data serializer and
transmitted. Data that is simultaneously received is stored at the pointer address in re-
ceive RAM.
Table 6-3 BITS Encoding
BITS Bits per Transfer
0000 16
0001 Reserved
0010 Reserved
0011 Reserved
0100 Reserved
0101 Reserved
0110 Reserved
0111 Reserved
1000 8
1001 9
1010 10
1011 11
1100 12
1101 13
1110 14
1111 15
Delay after Transfer 32 DTL×
System Clock Frequency
------------------------------------------------------------------=
Standard Delay after Transfer 17
System Clock
------------------------------------=
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6-20 USER’S MANUAL
When the proper number of bits have been transferred, the QSPI stores the working
queue pointer value in CPTQP, increments the working queue pointer, and loads the
next data for transfer from transmit RAM. The command pointed to by the incremented
working queue pointer is executed next, unless a new value has been written to
NEWQP. If a new queue pointer value is written while a transfer is in progress, that
transfer is completed normally.
When the CONT bit in command RAM is set, PCS pins are continuously driven in
specified states during and between transfers. If the chip-select pattern changes dur-
ing or between transfers, the original pattern is driven until execution of the following
transfer begins. When CONT is cleared, the data in register PORTQS is driven be-
tween transfers.
When the QSPI reaches the end of the queue, it sets the SPIF flag. If the SPIFIE bit
in SPCR2 is set, an interrupt request is generated when SPIF is asserted. At this point,
the QSPI clears SPE and stops unless wraparound mode is enabled.
6.3.5.2 Master Wraparound Mode
Wraparound mode is enabled by setting the WREN bit in SPCR2. The queue can wrap
to pointer address $0 or to the address pointed to by NEWQP, depending on the state
of the WRTO bit in SPCR2.
In wraparound mode, the QSPI cycles through the queue continuously, even while the
QSPI is requesting interrupt service. SPE is not cleared when the last command in the
queue is executed. New receive data overwrites previously received data in receive
RAM. Each time the end of the queue is reached, the SPIF flag is set. SPIF is not au-
tomatically reset. If interrupt-driven SPI service is used, the service routine must clear
the SPIF bit to abort the current request. Additional interrupt requests during servicing
can be prevented by clearing SPIFIE, but SPIFIE is buffered. Clearing it does not abort
a current request.
There are two recommended methods of exiting wraparound mode: clearing the
WREN bit or setting the HALT bit in SPCR3. Exiting wraparound mode by clearing
SPE is not recommended, as clearing SPE may abort a serial transfer in progress. The
QSPI sets SPIF, clears SPE, and stops the first time it reaches the end of the queue
after WREN is cleared. After HALT is set, the QSPI finishes the current transfer, then
stops executing commands. After the QSPI stops, SPE can be cleared.
6.3.5.3 Slave Mode
Clearing the MSTR bit in SPCR0 selects slave mode operation. In slave mode, the
QSPI is unable to initiate serial transfers. Transfers are initiated by an external bus
master. Slave mode is typically used on a multi-master SPI bus. Only one device can
be bus master (operate in master mode) at any given time.
Before QSPI operation is initiated, QSM register PQSPAR must be written to assign
necessary pins to the QSPI. The pins necessary for slave mode operation are MISO
and MOSI, SCK, and PCS0/SS. MISO is used for serial data output in slave mode, and
MOSI is used for serial data input. Either or both may be necessary, depending on the
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USER’S MANUAL 6-21
particular application. SCK is the serial clock input in slave mode. Assertion of the ac-
tive-low slave select signal SS initiates slave mode operation.
Before slave mode operation is initiated, DDRQS must be written to direct data flow
on the QSPI pins used. Configure the MOSI, SCK and PCS0/SS pins as inputs. The
MISO pin must be configured as an output.
After pins are assigned and configured, write data to be transmitted into transmit RAM.
Command RAM is not used in slave mode and does not need to be initialized. Unused
portions of QSPI RAM can be used by the CPU as general-purpose RAM. Initialize the
queue pointers as appropriate.
When SPE is set and MSTR is clear, a low state on the slave select (PCS0/SS) pin
begins slave mode operation at the address indicated by NEWQP. Data that is re-
ceived is stored at the pointer address in receive RAM. Data is simultaneously loaded
into the data serializer from the pointer address in transmit RAM and transmitted.
Transfer is synchronized with the externally generated SCK. The CPHA and CPOL
bits determine on which SCK edge to latch incoming data from the MISO pin and to
drive outgoing data from the MOSI pin.
Because the command control segment is not used, the command control bits and pe-
ripheral chip-select codes have no effect in slave mode operation. The PCS0/SS pin
is used only as an input.
The SPBR, DT and DSCK bits are not used in slave mode. The QSPI drives neither
the clock nor the chip-select pins and thus cannot control clock rate or transfer delay.
Because the BITSE option is not available in slave mode, the BITS field specifies the
number of bits to be transferred for all transfers in the queue. When the number of bits
designated by BITS has been transferred, the QSPI stores the working queue pointer
value in CPTQP, increments the working queue pointer, and loads new transmit data
from transmit RAM into the data serializer. The working queue pointer address is used
the next time PCS0/SS is asserted, unless the CPU writes to NEWQP first.
The QSPI shifts one bit for each pulse of SCK until the slave select input goes high. If
SS goes high before the number of bits specified by the BITS field is transferred, the
QSPI resumes operation at the same pointer address the next time SS is asserted.
The maximum value that the BITS field can have is 16. If more than 16 bits are trans-
mitted before SS is negated, pointers are incremented and operation continues. The
QSPI transmits as many bits as it receives at each queue address, until the BITS value
is reached or SS is negated. SS does not need to go high between transfers, as the
QSPI transfers data until reaching the end of the queue, whether SS remains low or is
toggled between transfers.
When the QSPI reaches the end of the queue, it sets the SPIF flag. If the SPIFIE bit
in SPCR2 is set, an interrupt request is generated when SPIF is asserted. At this point,
the QSPI clears SPE and stops unless wraparound mode is enabled.
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6-22 USER’S MANUAL
6.3.5.4 Slave Wraparound Mode
Slave wraparound mode is enabled by setting the WREN bit in SPCR2. The queue can
wrap to pointer address $0 or to the address pointed to by NEWQP, depending on the
state of the WRTO bit in SPCR2. Slave wraparound operation is identical to master
wraparound operation.
6.3.6 Peripheral Chip Selects
Peripheral chip-select signals are used to select an external device for serial data
transfer. Chip-select signals are asserted when a command in the queue is executed.
Signals are asserted at a logic level corresponding to the value of the PCS bits in the
command. More than one chip-select signal can be asserted at a time, and more than
one external device can be connected to each PCS pin, provided proper fanout is ob-
served. PCS0 shares a pin with the slave select SS signal, which initiates slave mode
serial transfer. If SS is taken low when the QSPI is in master mode, a mode fault oc-
curs.
To set up a chip-select function, set the appropriate bit in PQSPAR, then configure the
chip-select pin as an output by setting the appropriate bit in DDRQS. The value of the
bit in PORTQS that corresponds to the chip-select pin determines the base state of
the chip-select signal. If base state is zero, chip-select assertion must be active high
(PCS bit in command RAM must be set); if base state is one, assertion must be active
low (PCS bit in command RAM must be cleared). PORTQS bits are cleared during re-
set. If no new data is written to PORTQS before pin assignment and configuration as
an output, base state of chip-select signals is zero and chip-select pins are configured
for active-high operation.
6.4 Serial Communication Interface
The serial communication interface (SCI) communicates with external devices through
an asynchronous serial bus. The SCI uses a standard nonreturn to zero (NRZ) trans-
mission format. The SCI is fully compatible with other Freescale SCI systems, such as
those in M68HC11 and M68HC05 devices. Figure 6-7 is a block diagram of the SCI
transmitter; Figure 6-8 is a block diagram of the SCI receiver.
6.4.1 SCI Registers
The SCI programming model includes the QSM global and pin control registers, and
four SCI registers. There are two SCI control registers (SCCR0 and SCCR1), one sta-
tus register (SCSR), and one data register (SCDR). Refer to APPENDIX D REGIS-
TER SUMMARY for register bit and field definition.
6.4.1.1 Control Registers
SCCR0 contains the baud rate selection field. Baud rate must be set before the SCI is
enabled. The CPU can read and write this register at any time.
SCCR1 contains a number of SCI configuration parameters, including transmitter and
receiver enable bits, interrupt enable bits, and operating mode enable bits. The CPU
can read and write this register at any time. The SCI can modify the RWU bit under
certain circumstances.
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USER’S MANUAL 6-23
Changing the value of SCI control bits during a transfer operation may disrupt opera-
tion. Before changing register values, allow the SCI to complete the current transfer,
then disable the receiver and transmitter.
Figure 6-7 SCI Transmitter Block Diagram
68300 SCI TX BLOCK
0
LOOPS
WOMS
ILT
PT
PE
M
WAKE
TIE
TCIE
RIE
ILIE
TE
RE
RWU
SBK
TRANSMITTER
CONTROL LOGIC
PIN BUFFER
AND CONTROL
H(8)76543210L
10 (11) - BIT Tx SHIFT REGISTER
MDDR7
MDDR5 TxD
SCDR Tx BUFFER
TRANSFER Tx BUFFER
SHIFT ENABLE
JAM ENABLE
PREAMBLE–JAM 1's
BREAK–JAM 0's
(WRITE-ONLY)
FORCE PIN
DIRECTION
SIZE 8/9
PARITY
GENERATOR
TRANSMITTER
BAUD RATE
CLOCK
TC
TDRE
SCI Rx
REQUESTS SCI INTERRUPT
REQUEST
FE
NF
OR
IDLE
RDRF
TC
TDRE
SCSR (STATUS REGISTER)
PF
INTERNAL
DATA BUS
RAF
TIE
TCIE
SCCR1 (CONTROL REGISTER 1) 015 15 0
START
STOP
OPEN DRAIN OUTPUT MODE ENABLE
(OUT)
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6-24 USER’S MANUAL
Figure 6-8 SCI Receiver Block Diagram
0
LOOPS
WOMC
ILT
PT
PE
M
WAKE
RIE
ILIE
TE
RE
RWU
SBK
TIE
TCIE
SCCR1 (CONTROL REGISTER 1) 015
FE
NF
OR
IDLE
RDRF
TC
TDRE
SCSR (STATUS REGISTER)
PF
RAF
15 0
WAKEUP
LOGIC
PIN BUFFERRxD
STOP
(8)76543210
10 (11) - BIT
Rx SHIFT REGISTER
START
MSB ALL ONES
DATA
RECOVERY
÷16
PARITY
DETECT
RECEIVER
BAUD RATE
CLOCK
SCDR Rx BUFFER
(READ-ONLY)
SCI Tx
REQUESTS SCI INTERRUPT
REQUEST INTERNAL
DATA BUS
LH
68300 SCI RX BLOCK
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USER’S MANUAL 6-25
6.4.1.2 Status Register
The SCI status register (SCSR) contains flags that show SCI operating conditions.
These flags are cleared either by SCI hardware or by a read/write sequence. In gen-
eral, flags are cleared by reading the SCSR, then reading (receiver status bits) or writ-
ing (transmitter status bits) the SCDR. A long-word read can consecutively access
both the SCSR and SCDR. This action clears receive status flag bits that were set at
the time of the read, but does not clear TDRE or TC flags.
If an internal SCI signal for setting a status bit comes after the CPU has read the as-
serted status bits, but before the CPU has written or read the SCDR, the newly set sta-
tus bit is not cleared. The SCSR must be read again with the bit set, and the SCDR
must be written or read before the status bit is cleared.
Reading either byte of the SCSR causes all 16 bits to be accessed, and any status bit
already set in either byte is cleared on a subsequent read or write of the SCDR.
6.4.1.3 Data Register
The SCDR contains two data registers at the same address. The RDR is a read-only
register that contains data received by the SCI serial interface. The data comes into
the receive serial shifter and is transferred to the RDR. The TDR is a write-only register
that contains data to be transmitted. The data is first written to the TDR, then trans-
ferred to the transmit serial shifter, where additional format bits are added before trans-
mission. R[7:0]/T[7:0] contain either the first eight data bits received when the SCDR
is read, or the first eight data bits to be transmitted when the SCDR is written. R8/T8
are used when the SCI is configured for 9-bit operation. When it is configured for 8-bit
operation, they have no meaning or effect.
6.4.2 SCI Pins
Two unidirectional pins, TXD (transmit data) and RXD (receive data), are associated
with the SCI. TXD can be used by the SCI or for general-purpose I/O. Function is as-
signed by the port QS pin assignment register (PQSPAR). The receive data (RXD) pin
is dedicated to the SCI. Table 6-4 shows SCI pin function.
6.4.3 SCI Operation
SCI status flags in the SPSR support polled operation, or interrupt-driven operation
can be employed by the interrupt enable bits in SCCR1.
6.4.3.1 Definition of Terms
• Bit-Time — The time required to transmit or receive one bit of data; one cycle of
the baud frequency.
Table 6-4 SCI Pin Function
Pin Names Mnemonics Mode Function
Receive Data RXD Receiver Disabled
Receiver Enabled
Not Used
Serial Data Input to SCI
Transmit Data TXD Transmitter Disabled
Transmitter Enabled
General-Purposed I/O
Serial Data Output from SCI
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• Start Bit — One bit-time of logic zero that indicates the beginning of a data frame.
A start bit must begin with a one-to-zero transition and be preceded by at least
three receive time (RT) samples of logic one.
• Stop Bit — One bit-time of logic one that indicates the end of a data frame.
• Frame — A complete unit of serial information. The SCI can use 10-bit or 11-bit
frames.
• Data Frame — A start bit, a specified number of data or information bits, and at
least one stop bit.
• Idle Frame — A frame that consists of consecutive ones. An idle frame has no
start bit.
• Break Frame — A frame that consists of consecutive zeros. A break frame has
no stop bits.
6.4.3.2 Serial Formats
All data frames must have a start bit and at least one stop bit. Receiving and transmit-
ting devices must use the same data frame format. The SCI provides hardware sup-
port for both ten-bit and eleven-bit frames. The serial mode (M) bit in SCI control
register one (SCCR1) specifies the number of bits per frame.
The most common ten-bit data frame format for NRZ serial interface consists of one
start bit, eight data bits (LSB first), and one stop bit. The most common eleven-bit data
frame contains one start bit, eight data bits, a parity or control bit, and one stop bit.
Ten-bit and eleven-bit frames are shown in Table 6-5.
6.4.3.3 Baud Clock
The SCI baud clock is programmed by writing a 13-bit value to the baud rate (SCBR)
field in SCI control register zero (SCCR0). Baud clock is derived from the MCU system
clock by a modulus counter. Writing a value of zero to SCBR disables the baud rate
generator. Baud clock rate is calculated as follows:
where SCBR is in the range {1, 2, 3,..., 8191}.
The SCI receiver operates asynchronously. An internal clock is necessary to synchro-
nize with an incoming data stream. The SCI baud clock generator produces a receive
Table 6-5 Serial Frame Formats
10-Bit Frames
Start Data Parity/Control Stop
1 7—2
1711
1 8—1
11-Bit Frames
Start Data Parity/Control Stop
1712
1811
SCI Baud Clock Rate System Clock
32 SCBR×
------------------------------------=
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USER’S MANUAL 6-27
time (RT) sampling clock with a frequency 16 times that of the SCI baud clock. The
SCI determines the position of bit boundaries from transitions within the received
waveform, and adjusts sampling points to the proper positions within the bit period.
6.4.3.4 Parity Checking
The parity type (PT) bit in SCCR1 selects either even (PT = 0) or odd (PT = 1) parity.
PT affects received and transmitted data. The parity enable (PE) bit in SCCR1 deter-
mines whether parity checking is enabled (PE = 1) or disabled (PE = 0). When PE is
set, the MSB of the data in a frame is used for the parity function. For transmitted data,
a parity bit is generated; for received data, the parity bit is checked. When parity check-
ing is enabled, the parity flag (PF) in the SCI status register (SCSR) is set if a parity
error is detected.
Enabling parity affects the number of data bits in a frame, which can in turn affect
frame size. Table 6-6 shows possible data and parity formats.
6.4.3.5 Transmitter Operation
The transmitter consists of a serial shifter and a parallel data register (TDR) located in
the SCI data register (SCDR). The serial shifter cannot be directly accessed by the
CPU. The transmitter is double-buffered, which means that data can be loaded into
the TDR while other data is shifted out. The transmitter enable (TE) bit in SCCR1 en-
ables (TE = 1) and disables (TE = 0) the transmitter.
Shifter output is connected to the TXD pin while the transmitter is operating (TE = 1,
or TE = 0 and transmission in progress). Wired-OR operation should be specified
when more than one transmitter is used on the same SCI bus. The wired-OR mode
select bit (WOMS) in SCCR1 determines whether TXD is an open-drain (wired-OR)
output or a normal CMOS output. An external pull-up resistor on the TXD pin is nec-
essary for wired-OR operation. WOMS controls TXD function whether the pin is used
for SCI transmissions (TE = 1) or as a general-purpose I/O pin.
Data to be transmitted is written to TDR, then transferred to the serial shifter. The
transmit data register empty (TDRE) flag in SCSR shows the status of TDR. When
TDRE = 0, TDR contains data that has not been transferred to the shifter. Writing to
TDR again overwrites the data. TDRE is set when the data in TDR is transferred to the
shifter. Before new data can be written to TDR, however, the processor must clear
TDRE by writing to SCSR. If new data is written to TDR without first clearing TDRE,
the data will not be transmitted.
Table 6-6 Effect of Parity Checking on Data Size
M PE Result
0 0 8 Data Bits
0 1 7 Data Bits, 1 Parity Bit
1 0 9 Data Bits
1 1 8 Data Bits, 1 Parity Bit
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The transmission complete (TC) flag in SCSR shows transmitter shifter state. When
TC = 0, the shifter is busy. TC is set when all shifting operations are completed. TC is
not automatically cleared. The processor must clear it by first reading SCSR while TC
is set, then writing new data to TDR.
The state of the serial shifter is checked when the TE bit is set. If TC = 1, an idle frame
is transmitted as a preamble to the following data frame. If TC = 0, the current opera-
tion continues until the final bit in the frame is sent, then the preamble is transmitted.
The TC bit is set at the end of preamble transmission.
The send break (SBK) bit in SCCR1 is used to insert break frames in a transmission.
A nonzero integer number of break frames is transmitted while SBK is set. Break trans-
mission begins when SBK is set, and ends with the transmission in progress at the
time either SBK or TE are cleared. If SBK is set while a transmission is in progress,
that transmission finishes normally before the break begins. To assure the minimum
break time, toggle SBK quickly to one and back to zero. The TC bit is set at the end of
break transmission. After break transmission, at least one bit-time of logic level one
(mark idle) is transmitted to ensure that a subsequent start bit can be detected.
If TE remains set, after all pending idle, data and break frames are shifted out, TDRE
and TC are set and TXD is held at logic level one (mark).
When TE is cleared, the transmitter is disabled after all pending idle, data and break
frames are transmitted. The TC flag is set, and the TXD pin reverts to control by PQS-
PAR and DDRQS. Buffered data is not transmitted after TE is cleared. To avoid losing
data in the buffer, do not clear TE until TDRE is set.
Some serial communication systems require a mark on the TXD pin even when the
transmitter is disabled. Configure the TXD pin as an output (DDRQS), then write a one
to PORTQS bit 7. When the transmitter releases control of the TXD pin, it reverts to
driving a logic one output.
To insert a delimiter between two messages, to place nonlistening receivers in wakeup
mode between transmissions, or to signal a retransmission by forcing an idle line, clear
and then set TE before data in the serial shifter has shifted out. The transmitter finishes
the transmission, then sends a preamble. After the preamble is transmitted, if TDRE
is set, the transmitter will mark idle. Otherwise, normal transmission of the next se-
quence will begin.
Both TDRE and TC have associated interrupts. The interrupts are enabled by the
transmit interrupt enable (TIE) and transmission complete interrupt enable (TCIE) bits
in SCCR1. Service routines can load the last byte of data in a sequence into the TDR,
then terminate the transmission when a TDRE interrupt occurs.
6.4.3.6 Receiver Operation
The receiver enable (RE) bit in SCCR1 enables (RE = 1) and disables (RE = 0) the
transmitter. The receiver contains a receive serial shifter and a parallel receive data
register (RDR) located in the SCI data register (SCDR). The serial shifter cannot be
directly accessed by the CPU. The receiver is double-buffered, allowing data to be
held in RDR while other data is shifted in.
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Receiver bit processor logic drives a state machine that determines the logic level for
each bit-time. This state machine controls when the bit processor logic is to sample
the RXD pin and also controls when data is to be passed to the receive serial shifter.
A receive time (RT) clock is used to control sampling and synchronization. Data is
shifted into the receive serial shifter according to the most recent synchronization of
the RT clock with the incoming data stream. From this point on, data movement is syn-
chronized with the MCU system clock. Operation of the receiver state machine is de-
tailed in the
QSM Reference Manual
(QSMRM/AD).
The number of bits shifted in by the receiver depends on the serial format. However,
all frames must end with at least one stop bit. When the stop bit is received, the frame
is considered to be complete, and the received data in the serial shifter is transferred
to the RDR. The receiver data register flag (RDRF) is set when the data is transferred.
Noise errors, parity errors, and framing errors can be detected while a data stream is
being received. Although error conditions are detected as bits are received, the noise
flag (NF), the parity flag (PF), and the framing error (FE) flag in SCSR are not set until
data is transferred from the serial shifter to RDR.
RDRF must be cleared before the next transfer from the shifter can take place. If
RDRF is set when the shifter is full, transfers are inhibited and the overrun error (OR)
flag in the SCSR is set. OR indicates that the CPU needs to service RDR faster. When
OR is set, the data in RDR is preserved, but the data in the serial shifter is lost. Be-
cause framing, noise, and parity errors are detected while data is in the serial shifter,
FE, NF, and PF cannot occur at the same time as OR.
When the CPU reads the SCSR and the SCDR in sequence, it acquires status and
data, and also clears the status flags. Reading the SCSR acquires status and arms
the clearing mechanism. Reading the SCDR acquires data and clears the SCSR.
When RIE in SCCR1 is set, an interrupt request is generated whenever RDRF is set.
Because receiver status flags are set at the same time as RDRF, they do not have
separate interrupt enables.
6.4.3.7 Idle-Line Detection
During a typical serial transmission, frames are transmitted isochronously and no idle
time occurs between frames. Even when all the data bits in a frame are logic ones, the
start bit provides one logic zero bit-time during the frame. An idle line is a sequence of
contiguous ones equal to the current frame size. Frame size is determined by the state
of the M bit in SCCR1.
The SCI receiver has both short and long idle-line detection capability. Idle-line detec-
tion is always enabled. The idle line type (ILT) bit in SCCR1 determines which type of
detection is used. When an idle line condition is detected, the IDLE flag in SCSR is set.
For short idle-line detection, the receiver bit processor counts contiguous logic one bit-
times whenever they occur. Short detection provides the earliest possible recognition
of an idle line condition, because the stop bit and contiguous logic ones before and
after it are counted. For long idle-line detection, the receiver counts logic ones after
the stop bit is received. Only a complete idle frame causes the IDLE flag to be set.
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In some applications, CPU overhead can cause a bit-time of logic level one to occur
between frames. This bit-time does not affect content, but if it occurs after a frame of
ones when short detection is enabled, the receiver flags an idle line.
When the idle line interrupt enable (ILIE) bit in SCCR1 is set, an interrupt request is
generated when the IDLE flag is set. The flag is cleared by reading SCSR and SCDR
in sequence. IDLE is not set again until after at least one frame has been received
(RDRF = 1). This prevents an extended idle interval from causing more than one in-
terrupt.
6.4.3.8 Receiver Wakeup
The receiver wakeup function allows a transmitting device to direct a transmission to
a single receiver or to a group of receivers by sending an address frame at the start of
a message. Hardware activates each receiver in a system under certain conditions.
Resident software must process address information and enable or disable receiver
operation.
A receiver is placed in wakeup mode by setting the receiver wakeup (RWU) bit in
SCCR1. While RWU is set, receiver status flags and interrupts are disabled. Although
the CPU can clear RWU, it is normally cleared by hardware during wakeup.
The WAKE bit in SCCR1 determines which type of wakeup is used. When WAKE = 0,
idle-line wakeup is selected. When WAKE = 1, address-mark wakeup is selected. Both
types require a software-based device addressing and recognition scheme.
Idle-line wakeup allows a receiver to sleep until an idle line is detected. When an idle-
line is detected, the receiver clears RWU and wakes up. The receiver waits for the first
frame of the next transmission. The byte is received normally, transferred to register
RDR, and the RDRF flag is set. If software does not recognize the address, it can set
RWU and put the receiver back to sleep. For idle-line wakeup to work, there must be
a minimum of one frame of idle line between transmissions. There must be no idle time
between frames within a transmission.
Address-mark wakeup uses a special frame format to wake up the receiver. When the
MSB of an address-mark frame is set, that frame contains address information. The
first frame of each transmission must be an address frame. When the MSB of a frame
is set, the receiver clears RWU and wakes up. The byte is received normally, trans-
ferred to register RDR, and the RDRF flag is set. If software does not recognize the
address, it can set RWU and put the receiver back to sleep. Address-mark wakeup al-
lows idle time between frames and eliminates idle time between transmissions. How-
ever, there is a loss of efficiency because of an additional bit-time per frame.
6.4.3.9 Internal Loop
The LOOPS bit in SCCR1 controls a feedback path on the data serial shifter. When
LOOPS is set, SCI transmitter output is fed back into the receive serial shifter. TXD is
asserted (idle line). Both transmitter and receiver must be enabled before entering
loop mode.
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6.5 QSM Initialization
After reset, the QSM remains in an idle state until initialized. A general sequence guide
for initialization follows.
A. Global
1. Configuration register (QSMCR)
a. Write an interrupt arbitration priority value into the IARB field.
b. Clear the FREEZE and/or STOP bits for normal operation.
2. Interrupt vector and interrupt level registers (QIVR and QILR)
a. Write QSPI/SCI interrupt vector into QIVR.
b. Write QSPI (ILSPI) and SCI (ILSCI) interrupt priorities into QILR.
3. Port data and data direction registers (PORTQS and DDRQS)
a. Write a data word to PORTQS.
b. Establish direction of QSM pins used for I/O by writing to DDRQS.
4. Assign pin functions by writing to the pin assignment register (PQSPAR)
B. Queued Serial Peripheral Interface
1. Write appropriate values to QSPI command RAM.
2. QSPI control register zero (SPCR0)
a. Write a transfer rate value into the BR field.
b. Determine clock phase (CPHA), and clock polarity (CPOL).
c. Determine number of bits to be transferred in a serial operation (BIT).
d. Select master or slave operating mode (MSTR).
e. Enable or disable wired-OR operation (WOMQ).
3. QSPI control register one (SPCR1)
a. Establish a delay following serial transfer by writing to the DTL field.
b. Establish a delay before serial transfer by writing to the DSCKL field.
4. QSPI control register two (SPCR2)
a. Write an initial queue pointer value into the NEWQP field.
b. Write a final queue pointer value into the ENDQP field.
c. Enable or disable queue wraparound (WREN).
d. Write wraparound address into the WRTO field.
e. Enable or disable QSPI flag interrupt (SPIFIE).
5. QSPI control register three (SPCR3)
a. Enable or disable halt at end of queue (HALT).
b. Enable or disable halt and mode fault interrupts (HMIE).
c. Enable or disable loopback (LOOPQ).
6. To enable the QSPI, set the SPE bit in SPCR1.
C. Serial Communication Interface (SCI)
1. SCI control register zero (SCCR0)
a. Write a transfer rate (baud) value into the BR field.
2. SCI control register one (SCCR1)
a. Select serial mode (M)
b. Enable use (PE) and type (PT) of parity check.
c. Select use (RWU) and type (WAKE) of receiver wakeup.
d. Enable idle-line detection (ILT) and interrupt (ILIE).
e. Enable or disable wired-OR operation (WOMS).
f. Enable or disable break transmission (BK).
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6-32 USER’S MANUAL
3. To receive
a. Set the receiver (RE) and receiver interrupt (RIE) bits in SCCR1.
4. To transmit
a. Set transmitter (TE) and transmitter interrupt (TIE).
b. Clear the transmitter data register empty (TDRE) and transmit complete
(TC) indicators by reading the serial communication interface status reg-
ister (SCSR).
c. Write transmit data to the serial communication data register (SCDR).
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MC68332 TIME PROCESSOR UNIT
USER’S MANUAL 7-1
SECTION 7TIME PROCESSOR UNIT
The time processor unit (TPU) is an intelligent, semi-autonomous microcontroller de-
signed for timing control. Operating simultaneously with the CPU, the TPU schedules
tasks, processes ROM instructions, accesses shared data with the CPU, and performs
input and output. Figure 7-1 is a simplified block diagram of the TPU.
Figure 7-1 TPU Block Diagram
7.1 General
The TPU can be viewed as a special-purpose microcomputer that performs a pro-
grammable series of two operations, match and capture. Each occurrence of either
operation is called an event. A programmed series of events is called a function. TPU
functions replace software functions that would require host CPU interrupt service.
The following pre-programmed timing functions are currently available:
• Input capture/input transition counter
• Output compare
• Pulse-width modulation
• Synchronized pulse-width modulation
• Period measurement with additional transition detect
• Period measurement with missing transition detect
• Position-synchronized pulse generator
• Stepper motor
• Period/pulse-width accumulator
T2CLK
PINS
SERVICE REQUESTS
DATA
TCR1
TCR2
MICROENGINE
CONTROL
STORE
EXECUTION
UNIT
I M B
PARAMETER
RAM
CHANNEL
CONTROL
DEVELOPMENT
SUPPORT AND TEST
SYSTEM
CONFIGURATION
SCHEDULER
CONTROL AND DATA
CONTROL
TIMER
CHANNELS
CHANNEL 0
CHANNEL 1
CHANNEL 15
CHANNEL
DATA
TPU BLOCK
HOST
INTERFACE
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7.2 TPU Components
The TPU module consists of two 16-bit time bases, sixteen independent timer chan-
nels, a task scheduler, a microengine, and a host interface. In addition, a dual-port pa-
rameter RAM is used to pass parameters between the module and the host CPU.
7.2.1 Time Bases
Two 16-bit counters provide reference time bases for all output compare and input
capture events. Prescalers for both time bases are controlled by the host CPU via bit
fields in the TPU module configuration register (TPUMCR). Timer count registers
TCR1 and TCR2 provide access to current counter values. TCR1 and TCR2 can be
read or written to by TPU microcode, but are not directly available to the host CPU.
The TCR1 clock is derived from the system clock. The TCR2 clock can be derived from
the system clock or from an external clock input via the T2CLK pin.
7.2.2 Timer Channels
The TPU has 16 independent channels, each connected to an MCU pin. The channels
have identical hardware. Each channel consists of an event register and pin control
logic. The event register contains a 16-bit capture register, a 16-bit compare/match
register, and a 16-bit greater-than-or-equal-to comparator. The direction of each pin,
either output or input, is determined by the TPU microengine. Each channel can either
use the same time base for match and capture, or can use one time base for match
and the other for capture.
7.2.3 Scheduler
When a service request is received, the scheduler determines which TPU channel is
serviced by the microengine. A channel can request service for one of four reasons:
for host service, for a link to another channel, for a match event, or for a capture event.
The host system assigns each active channel one of three priorities: high, middle, or
low. When multiple service requests are received simultaneously, a priority-scheduling
mechanism grants service based on channel number and assigned priority.
7.2.4 Microengine
The microengine is composed of a control store and an execution unit. Control-store
ROM holds the microcode for each factory-masked time function. When assigned to a
channel by the scheduler, the execution unit executes microcode for a function as-
signed to that channel by the host CPU. Microcode can also be executed from the
TPURAM module instead of the control store. The TPURAM module allows emulation
and development of custom TPU microcode without the generation of a microcode
ROM mask. Refer to 7.3.6 Emulation Support for more information.
7.2.5 Host Interface
Host interface registers allow communication between the host CPU and the TPU,
both before and during execution of a time function. The registers are accessible from
the IMB through the TPU bus interface unit. Refer to 7.6 Host Interface Registers and
APPENDIX D REGISTER SUMMARY for register bit/field definitions and address
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USER’S MANUAL 7-3
7.2.6 Parameter RAM
Parameter RAM occupies 256 bytes at the top of the system address map. Channel
parameters are organized as 128 16-bit words. Although all parameter word locations
in RAM can be accessed by all channels, only 100 are normally used: channels 0 to
13 use six parameter words, while channels 14 and 15 each use eight parameter
words. The parameter RAM address map in APPENDIX D REGISTER SUMMARY
shows how parameter words are organized in memory.
The host CPU specifies function parameters by writing the appropriate RAM address.
The TPU reads the RAM to determine channel operation. The TPU can also store in-
formation to be read by the CPU in RAM. Detailed descriptions of the parameters re-
quired by each time function are beyond the scope of this manual. Refer to the
TPU
Reference Manual
(TPURM/AD) for more information.
For pre-programmed functions, one of the parameter words associated with each
channel contains three channel control fields. These fields perform the following func-
tions:
PSC — Forces the output level of the pin.
PAC — For input capture, PAC specifies the edge transition to be detected. For out-
put comparison, PAC specifies the logic level to be output when a match oc-
curs.
TBS — Specifies channel direction (input or output) and assigns a time base to the
input capture and output compare functions of the channel.
7.3 TPU Operation
All TPU functions are related to one of the two 16-bit time bases. Functions are syn-
thesized by combining sequences of match events and capture events. Because the
primitives are implemented in hardware, the TPU can determine precisely when a
match or capture event occurs, and respond rapidly. An event register for each chan-
nel provides for simultaneity of match/capture event occurrences on all channels.
When a match or input capture event requiring service occurs, the affected channel
generates a service request to the scheduler. The scheduler determines the priority of
the request and assigns the channel to the microengine at the first available time. The
microengine performs the function defined by the content of the control store or emu-
lation RAM, using parameters from the parameter RAM.
7.3.1 Event Timing
Match and capture events are handled by independent channel hardware. This pro-
vides an event accuracy of one time-base clock period, regardless of the number of
channels that are active. An event normally causes a channel to request service. How-
ever, before an event can be serviced, any pending previous requests must be ser-
viced. The time needed to respond to and service an event is determined by the
number of channels requesting service, the relative priorities of the channels request-
ing service, and the microcode execution time of the active functions. Worst-case
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event service time (latency) determines TPU performance in a given application. La-
tency can be closely estimated — refer to Freescale
TPU Reference Manual
(TPURM/
AD) for more information.
7.3.2 Channel Orthogonality
Most timer systems are limited by the fixed number of functions assigned to each pin.
All TPU channels contain identical hardware and are functionally equivalent in opera-
tion, so that any channel can be configured to perform any time function. Any function
can operate on the calling channel, and, under program control, on another channel
determined by the program or by a parameter. The user controls the combination of
time functions.
7.3.3 Interchannel Communication
The autonomy of the TPU is enhanced by the ability of a channel to affect the opera-
tion of one or more other channels without CPU intervention. Interchannel communi-
cation can be accomplished by issuing a link service request to another channel, by
controlling another channel directly, or by accessing the parameter RAM of another
channel.
7.3.4 Programmable Channel Service Priority
The TPU provides a programmable service priority level to each channel. Three prior-
ity levels are available. When more than one channel of a given priority requests ser-
vice at the same time, arbitration is accomplished according to channel number. To
prevent a single high-priority channel from permanently blocking other functions, other
service requests of the same priority are performed in channel order after the lowest-
numbered, highest-priority channel is serviced.
7.3.5 Coherency
For data to be coherent, all available portions of it must be identical in age, or must be
logically related. As an example, consider a 32-bit counter value that is read and writ-
ten as two 16-bit words. The 32-bit value is read-coherent only if both 16-bit portions
are updated at the same time, and write-coherent only if both portions take effect at
the same time. Parameter RAM hardware supports coherent access of two adjacent
16-bit parameters. The host CPU must use a long-word operation to guarantee coher-
ency.
7.3.6 Emulation Support
Although factory-programmed time functions can perform a wide variety of control
tasks, they may not be ideal for all applications. The TPU provides emulation capability
that allows the user to develop new time functions. Emulation mode is entered by set-
ting the EMU bit in the TPUMCR. In emulation mode, an auxiliary bus connection is
made between TPURAM and the TPU module, and access to TPURAM via the inter-
module bus is disabled. A 9-bit address bus, a 32-bit data bus, and control lines trans-
fer information between the modules. To ensure exact emulation, RAM module access
timing remains consistent with access timing of the TPU ROM control store.
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USER’S MANUAL 7-5
To support changing TPU application requirements, Freescale has established a TPU
function library. The function library is a collection of TPU functions written for easy as-
sembly in combination with each other or with custom functions. Refer to Freescale Pro-
gramming Note TPUPN00/D,
Using the TPU Function Library and TPU Emulation
Mode
for information about developing custom functions and accessing the TPU func-
tion library. Refer to the
TPU Reference Manual
(TPURM/AD) for more information
about specific functions.
7.3.7 TPU Interrupts
Each of the TPU channels can generate an interrupt service request. Interrupts for
each channel must be enabled by writing to the appropriate control bit in the channel
interrupt enable register (CIER). The channel interrupt status register (CISR) contains
one interrupt status flag per channel. Time functions set the flags. Setting a flag bit
causes the TPU to make an interrupt service request if the corresponding channel in-
terrupt enable bit is set and the interrupt request level is nonzero.
The value of the channel interrupt request level (CIRL) field in TICR determines the
priority of all TPU interrupt service requests. CIRL values correspond to MCU interrupt
request signals IRQ[7:1]. IRQ7 is the highest-priority request signal; IRQ1 has the low-
est priority. Assigning a value of %111 to CIRL causes IRQ7 to be asserted when a
TPU interrupt request is made; lower field values cause corresponding lower-priority
interrupt request signals to be asserted. Assigning CIRL a value of %000 disables all
interrupts.
The CPU recognizes only interrupt requests of a priority greater than the value con-
tained in the interrupt priority (IP) mask in the condition code register. When the CPU
acknowledges an interrupt request, the priority of the acknowledged interrupt is written
to the IP mask and is driven out onto the IMB address lines.
When the IP mask value driven out on the address lines is the same as the CIRL value,
the TPU contends for arbitration priority. The IARB field in TPUMCR contains the TPU
arbitration number. Each module that can make an interrupt service request must be
assigned a unique non-zero IARB value in order to implement an arbitration scheme.
Arbitration is performed by means of serial assertion of IARB field bit values. IARB is
initialized to $0 during reset.
When the TPU wins arbitration, it must respond to the CPU interrupt acknowledge cy-
cle by placing an interrupt vector number on the data bus. The vector number is used
to calculate displacement into the exception vector table. Vectors are formed by con-
catenating the 4-bit value of the CIBV field in the TPU interrupt configuration register
with the 4-bit number of the channel requesting interrupt service. Since the CIBV field
has a reset value of %00, it must be assigned a value corresponding to the upper nib-
ble of a block of 16 user-defined vector numbers before TPU interrupts are enabled,
or a TPU interrupt service request could cause the CPU to take one of the reserved
vectors in the exception vector table.
Refer to SECTION 4 SYSTEM INTEGRATION MODULE for further information about
interrupts. For more information about the exception vector table refer to SECTION 5
CENTRAL PROCESSING UNIT.
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7.4 Standard and Enhanced Standard Time Functions
The following paragraphs describe factory-programmed time functions implemented
in standard and enhanced standard TPU microcode ROM. A complete description of
the functions is beyond the scope of this manual. Refer to the
TPU Reference Manual
(TPURM/AD) for additional information.
7.4.1 Discrete Input/Output (DIO)
When a pin is used as a discrete input, a parameter indicates the current input level
and the previous 15 levels of a pin. Bit 15, the most significant bit of the parameter,
indicates the most recent state. Bit 14 indicates the next most recent state, and so on.
The programmer can choose one of the three following conditions to update the pa-
rameter: 1) when a transition occurs, 2) when the CPU makes a request, or 3) when a
rate specified in another parameter is matched. When a pin is used as a discrete out-
put, it is set high or low only upon request by the CPU.
7.4.2 Input Capture/Input Transition Counter (ITC)
Any channel of the TPU can capture the value of a specified TCR upon the occurrence
of each transition or specified number of transitions, and then generate an interrupt re-
quest to notify the CPU. A channel can perform input captures continually, or a chan-
nel can detect a single transition or specified number of transitions, then cease
channel activity until reinitialization. After each transition or specified number of tran-
sitions, the channel can generate a link to a sequential block of up to eight channels.
The user specifies a starting channel of the block and the number of channels within
the block. The generation of links depends on the mode of operation. In addition, after
each transition or specified number of transitions, one byte of the parameter RAM (at
an address specified by channel parameter) can be incremented and used as a flag
to notify another channel of a transition.
7.4.3 Output Compare (OC)
The output compare function generates a rising edge, falling edge, or a toggle of the
previous edge in one of three ways:
1. Immediately upon CPU initiation, thereby generating a pulse with a length equal
to a programmable delay time.
2. At a programmable delay time from a user-specified time.
3. Continuously. Upon receiving a link from a channel, OC references, without
CPU interaction, a specifiable period and calculates an offset:
where Ratio is a parameter supplied by the user.
This algorithm generates a 50% duty-cycle continuous square wave with each high/
low time equal to the calculated OFFSET. Due to offset calculation, there is an initial
link time before continuous pulse generation begins.
Offset Period Ratio×=
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7.4.4 Pulse-Width Modulation (PWM)
The TPU can generate a pulse-width modulation waveform with any duty cycle from
zero to 100% (within the resolution and latency capability of the TPU). To define the
PWM, the CPU provides one parameter that indicates the period and another param-
eter that indicates the high time. Updates to one or both of these parameters can direct
the waveform change to take effect immediately, or coherently beginning at the next
low-to-high transition of the pin.
7.4.5 Synchronized Pulse-Width Modulation (SPWM)
The TPU generates a PWM waveform in which the CPU can change the period and/
or high time at any time. When synchronized to a time function on a second channel,
the synchronized PWM low-to-high transitions have a time relationship to transitions
on the second channel.
7.4.6 Period Measurement with Additional Transition Detect (PMA)
This function and the following function are used primarily in toothed-wheel speed-
sensing applications, such as monitoring rotational speed of an engine. The period
measurement with additional transition detect function allows for a special-purpose
23-bit period measurement. It can detect the occurrence of an additional transition
(caused by an extra tooth on the sensed wheel) indicated by a period measurement
that is less than a programmable ratio of the previous period measurement.
Once detected, this condition can be counted and compared to a programmable num-
ber of additional transitions detected before TCR2 is reset to $FFFF. Alternatively, a
byte at an address specified by a channel parameter can be read and used as a flag.
A nonzero value of the flag indicates that TCR2 is to be reset to $FFFF once the next
additional transition is detected
7.4.7 Period Measurement with Missing Transition Detect (PMM)
Period measurement with missing transition detect allows a special-purpose 23-bit pe-
riod measurement. It detects the occurrence of a missing transition (caused by a miss-
ing tooth on the sensed wheel), indicated by a period measurement that is greater than
a programmable ratio of the previous period measurement. Once detected, this con-
dition can be counted and compared to a programmable number of additional transi-
tions detected before TCR2 is reset to $FFFF. In addition, one byte at an address
specified by a channel parameter can be read and used as a flag. A nonzero value of
the flag indicates that TCR2 is to be reset to $FFFF once the next missing transition
is detected.
7.4.8 Position-Synchronized Pulse Generator (PSP)
Any channel of the TPU can generate an output transition or pulse, which is a projec-
tion in time based on a reference period previously calculated on another channel.
Both TCRs are used in this algorithm: TCR1 is internally clocked, and TCR2 is clocked
by a position indicator in the user's device. An example of a TCR2 clock source is a
sensor that detects special teeth on the flywheel of an automobile using PMA or PMM.
The teeth are placed at known degrees of engine rotation; hence, TCR2 is a coarse
representation of engine degrees, i.e., each count represents some number of de-
grees.
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Up to 15 position-synchronized pulse generator function channels can operate with a
single input reference channel executing a PMA or PMM input function. The input
channel measures and stores the time period between the flywheel teeth and resets
TCR2 when the engine reaches a reference position. The output channel uses the pe-
riod calculated by the input channel to project output transitions at specific engine de-
grees. Because the flywheel teeth might be 30 or more degrees apart, a fractional
multiplication operation resolves down to the desired degrees. Two modes of opera-
tion allow pulse length to be determined either by angular position or by time.
7.4.9 Stepper Motor (SM)
The stepper motor control algorithm provides for linear acceleration and deceleration
control of a stepper motor with a programmable number of step rates of up to 14. Any
group of channels, up to eight, can be programmed to generate the control logic nec-
essary to drive a stepper motor.
The time period between steps (P) is defined as:
where r is the current step rate (1–14), and K1 and K2 are supplied as parameters.
After providing the desired step position in a 16-bit parameter, the CPU issues a step
request. Next, the TPU steps the motor to the desired position through an acceleration/
deceleration profile defined by parameters. The parameter indicating the desired po-
sition can be changed by the CPU while the TPU is stepping the motor. This algorithm
changes the control state every time a new step command is received.
A 16-bit parameter initialized by the CPU for each channel defines the output state of
the associated pin. The bit pattern written by the CPU defines the method of stepping,
such as full stepping or half stepping. With each transition, the 16-bit parameter rotates
one bit. The period of each transition is defined by the programmed step rate.
7.4.10 Period/Pulse-Width Accumulator (PPWA)
The period/pulse-width accumulator algorithm accumulates a 16-bit or 24-bit sum of
either the period or the pulse width of an input signal over a programmable number of
periods or pulses (from 1 to 255). After an accumulation period, the algorithm can gen-
erate a link to a sequential block of up to eight channels. The user specifies a starting
channel of the block and number of channels within the block. Generation of links de-
pends on the mode of operation. Any channel can be used to measure an accumulat-
ed number of periods of an input signal. A maximum of 24 bits can be used for the
accumulation parameter. From 1 to 255 period measurements can be made and
summed with the previous measurement(s) before the TPU interrupts the CPU, allow-
ing instantaneous or average frequency measurement, and the latest complete accu-
mulation (over the programmed number of periods).
The pulse width (high-time portion) of an input signal can be measured (up to 24 bits)
and added to a previous measurement over a programmable number of periods (1 to
255). This provides an instantaneous or average pulse-width measurement capability,
Pr() K1 K2 r×–=
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allowing the latest complete accumulation (over the specified number of periods) to al-
ways be available in a parameter. By using the output compare function in conjunction
with PPWA, an output signal can be generated that is proportional to a specified input
signal. The ratio of the input and output frequency is programmable. One or more out-
put signals with different frequencies, yet proportional and synchronized to a single in-
put signal, can be generated on separate channels.
7.4.11 Quadrature Decode (QDEC)
The quadrature decode function uses two channels to decode a pair of out-of-phase
signals in order to present the CPU with directional information and a position value.
It is particularly suitable for use with slotted encoders employed in motor control. The
function derives full resolution from the encoder signals and provides a 16-bit position
counter with rollover/under indication via an interrupt.
The counter in parameter RAM is updated when a valid transition is detected on either
one of the two inputs. The counter is incremented or decremented depending on the
lead/lag relationship of the two signals at the time of servicing the transition. The user
can read or write the counter at any time. The counter is free running, overflowing to
$0000 or underflowing to $FFFF depending on direction. The QDEC function also pro-
vides a time stamp referenced to TCR1 for every valid signal edge and the ability for
the host CPU to obtain the latest TCR1 value. This feature allows position interpolation
by the host CPU between counts at very slow count rates.
7.5 Motion Control Time Functions
The following paragraphs describe factory-programmed time functions implemented
in the motion-control microcode ROM. A complete description of the functions is be-
yond the scope of this manual. Refer to the
TPU Reference Manual
(TPURM/AD) for
additional information.
7.5.1 Table Stepper Motor (TSM)
The TSM function provides for acceleration and deceleration control of a stepper mo-
tor with a programmable number of step rates up to 58. TSM uses a table in parameter
RAM, rather than an algorithm, to define the stepper motor acceleration profile, allow-
ing the user to fully define the profile. In addition, a slew rate parameter allows fine
control of the terminal running speed of the motor independent of the acceleration ta-
ble. The CPU need only write a desired position, and the TPU accelerates, slews, and
decelerates the motor to the required position. Full and half step support is provided
for two-phase motors. In addition, a slew rate parameter allows fine control of the ter-
minal running speed of the motor independent of the acceleration table.
7.5.2 New Input Capture/Transition Counter (NITC)
Any channel of the TPU can capture the value of a specified TCR or any specified lo-
cation in parameter RAM upon the occurrence of each transition or specified number
of transitions, and then generate an interrupt request to notify the bus master. The
times of the most recent two transitions are maintained in parameter RAM. A channel
can perform input captures continually, or a channel can detect a single transition or
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specified number of transitions, ceasing channel activity until reinitialization. After
each transition or specified number of transitions, the channel can generate a link to
other channels.
7.5.3 Queued Output Match (QOM)
QOM can generate single or multiple output match events from a table of offsets in pa-
rameter RAM. Loop modes allow complex pulse trains to be generated once, a spec-
ified number of times, or continuously. The function can be triggered by a link from
another TPU channel. In addition, the reference time for the sequence of matches can
be obtained from another channel. QOM can generate pulse-width modulated wave-
forms, including waveforms with high times of 0% or 100%. QOM also allows a TPU
channel to be used as a discrete output pin.
7.5.4 Programmable Time Accumulator (PTA)
PTA accumulates a 32-bit sum of the total high time, low time, or period of an input
signal over a programmable number of periods or pulses. The accumulation can start
on a rising or falling edge. After the specified number of periods or pulses, the PTA
generates an interrupt request and optionally generates links to other channels.
From 1 to 255 period measurements can be made and summed with the previous
measurement(s) before the TPU interrupts the CPU, providing instantaneous or aver-
age frequency measurement capability, and the latest complete accumulation (over
the programmed number of periods).
7.5.5 Multichannel Pulse-Width Modulation (MCPWM)
MCPWM generates pulse-width modulated outputs with full 0% to 100% duty cycle
range independent of other TPU activity. This capability requires two TPU channels
plus an external gate for one PWM channel. (A simple one-channel PWM capability is
supported by the QOM function.)
Multiple PWMs generated by MCPWM have two types of high time alignment: edge
aligned and center aligned. Edge aligned mode uses n + 1 TPU channels for n PWMs;
center aligned mode uses 2n + 1 channels. Center aligned mode allows a user defined
“dead time” to be specified so that two PWMs can be used to drive an H-bridge without
destructive current spikes. This feature is important for motor control applications.
7.5.6 Fast Quadrature Decode (FQD)
FQD is a position feedback function for motor control. It decodes the two signals from
a slotted encoder to provide the CPU with a 16-bit free running position counter. FQD
incorporates a “speed switch” which disables one of the channels at high speed, al-
lowing faster signals to be decoded. A time stamp is provided on every counter update
to allow position interpolation and better velocity determination at low speed or when
low resolution encoders are used. The third index channel provided by some encoders
is handled by the ITC function.
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7.5.7 Universal Asynchronous Receiver/Transmitter (UART)
The UART function uses one or two TPU channels to provide asynchronous commu-
nications. Data word length is programmable from 1 to 14 bits. The function supports
detection or generation of even, odd, and no parity. Baud rate is freely programmable
and can be higher than 100 Kbaud. Eight bidirectional UART channels running in ex-
cess of 9600 baud can be implemented.
7.5.8 Brushless Motor Commutation (COMM)
This function generates the phase commutation signals for a variety of brushless mo-
tors, including three-phase brushless direct current. It derives the commutation state
directly from the position decoded in FQD, thus eliminating the need for hall effect sen-
sors.
The state sequence is implemented as a user-configurable state machine, thus pro-
viding a flexible approach with other general applications. A CPU offset parameter is
provided to allow all the switching angles to be advanced or retarded on the fly by the
CPU. This feature is useful for torque maintenance at high speeds.
7.5.9 Frequency Measurement (FQM)
FQM counts the number of input pulses to a TPU channel during a user-defined win-
dow period. The function has single shot and continuous modes. No pulses are lost
between sample windows in continuous mode. The user selects whether to detect
pulses on the rising or falling edge. This function is intended for high speed measure-
ment; measurement of slow pulses with noise rejection can be made with PTA.
7.5.10 Hall Effect Decode (HALLD)
This function decodes the sensor signals from a brushless motor, along with a direc-
tion input from the CPU, into a state number. The function supports two- or three-sen-
sor decoding. The decoded state number is written into a COMM channel, which
outputs the required commutation drive signals. In addition to brushless motor appli-
cations, the function can have more general applications, such as decoding “option”
switches.
7.6 Host Interface Registers
The TPU memory map contains three groups of registers:
• System Configuration Registers
• Channel Control and Status Registers
• Development Support and Test Verification Registers
All registers except the channel interrupt status register (CISR) must be read or written
by means of word accesses. The address space of the TPU memory map occupies
512 bytes. Unused registers within the 512-byte address space return zeros when
read.
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TIME PROCESSOR UNIT MC68332
7-12 USER’S MANUAL
7.6.1 System Configuration Registers
The TPU configuration control registers, TPUMCR and TICR, determine the value of
the prescaler, perform emulation control, specify whether the external TCR2 pin func-
tions as a clock source or as gate of the DIV8 clock for TCR2, and determine interrupt
request level and interrupt vector number assignment. Refer to APPENDIX D REGIS-
TER SUMMARY for more information about TPUMCR and TICR.
7.6.1.1 Prescaler Control for TCR1
Timer control register one (TCR1) is clocked from the output of a prescaler. Two fields
in the TPUMCR control TCR1. The prescaler's input is the internal TPU system clock
divided by either 4 or 32, depending on the value of the PSCK (prescaler clock) bit.
The prescaler divides this input by 1, 2, 4, or 8, depending on the value of TCR1P (tim-
er count register 1 prescaler control). Channels using TCR1 have the capability to re-
solve down to the TPU system clock divided by 4. Refer to Figure 7-2 and Table 7-1.
Figure 7-2 TCR1 Prescaler Control
7.6.1.2 Prescaler Control for TCR2
Timer control register two (TCR2), like TCR1, is clocked from the output of a prescaler.
The T2CG (TCR2 clock/gate control) bit in TPUMCR determines whether the external
TCR2 pin functions as an external clock source for TCR2 or as the gate in the use of
TCR2 as a gated pulse accumulator. The function of the T2CG bit is shown in Figure
7-3.
Table 7-1 TCR1 Prescaler Control
PSCK = 0 PSCK = 1
TCR1 Prescaler Divide
By Number of
Clocks Rate at
16 MHz Number of
Clocks Rate at
16 MHz
00 1 32 2 ms 4 250 ns
01 2 64 4 ms 8 500 ns
10 4 128 8 ms 16 1 ms
11 8 256 16 ms 32 2 ms
TCR1
015
PSCK
MUX
÷ 4 DIV4 CLOCK
÷ 32 DIV32 CLOCK
TCR1
PRESCALER
00 ÷ 1
01 ÷ 2
10 ÷ 4
11 ÷ 8
SYSTEM
CLOCK 1 – DIV4
0 – DIV32
PRESCALER CTL BLOCK 1
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MC68332 TIME PROCESSOR UNIT
USER’S MANUAL 7-13
Figure 7-3 TCR2 Prescaler Control
When the T2CG bit is set, the external TCR2 pin functions as a gate of the DIV8 clock
(the TPU system clock divided by 8). In this case, when the external TCR2 pin is low,
the DIV8 clock is blocked, preventing it from incrementing TCR2. When the external
TCR2 pin is high, TCR2 is incremented at the frequency of the DIV8 clock. When
T2CG is cleared, an external clock from the TCR2 pin, which has been synchronized
and fed through a digital filter, increments TCR2.
The TCR2 field in TPUMCR specifies the value of the prescaler: 1, 2, 4, or 8. Channels
using TCR2 have the capability to resolve down to the TPU system clock divided by
8. Table 7-2 is a summary of prescaler output.
7.6.1.3 Emulation Control
Asserting the EMU bit in the TPUMCR places the TPU in emulation mode. In emula-
tion mode, the TPU executes microinstructions from TPURAM exclusively. Access to
the TPURAM module through the IMB by a host is blocked, and the TPURAM module
is dedicated for use by the TPU. After reset, EMU can be written only once.
7.6.1.4 Low-Power Stop Control
If the STOP bit in the TPUMCR is set, the TPU shuts down its internal clocks, shutting
down the internal microengine. TCR1 and TCR2 cease to increment and retain the last
value before the stop condition was entered. The TPU asserts the stop flag (STF) in
the TPUMCR to indicate that it has stopped.
Table 7-2 TCR2 Prescaler Control
TCR2 Prescaler Divide By Internal Clock
Divided By External Clock
Divided By
00181
012162
104324
118648
PRESCALER CTL BLOCK 2
DIGITAL
FILTER
EXTERNAL
TCR2 PIN TCR2
(T2CG CONTROL BIT)
0 – A
1 – B
015
A
B
MUX
CONTROL
SYNCHRONIZER
TCR2
PRESCALER
00 ÷ 1
01 ÷ 2
10 ÷ 4
11 ÷ 8
INT CLK /8
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TIME PROCESSOR UNIT MC68332
7-14 USER’S MANUAL
7.6.2 Channel Control Registers
The channel control and status registers enable the TPU to control channel interrupts,
assign time functions to be executed on a specified channel, or select the mode of op-
eration or the type of host service request for the time function specified. Refer to Ta-
ble 7-3.
7.6.2.1 Channel Interrupt Enable and Status Registers
The channel interrupt enable register (CIER) allows the CPU to enable or disable the
ability of individual TPU channels to request interrupt service. Setting the appropriate
bit in the register enables a channel to make an interrupt service request; clearing a
bit disables the interrupt.
The channel interrupt status register (CISR) contains one interrupt status flag per
channel. Time functions specify via microcode when an interrupt flag is set. Setting a
flag causes the TPU to make an interrupt service request if the corresponding CIER
bit is set and the CIRL field has a nonzero value. To clear a status flag, read CISR,
then write a zero to the appropriate bit. CISR is the only TPU register that can be ac-
cessed on a byte basis.
7.6.2.2 Channel Function Select Registers
Encoded 4-bit fields within the channel function select registers specify one of 16 time
functions to be executed on the corresponding channel. Encodings for predefined
functions in the TPU ROM are found in Table 7-3.
7.6.2.3 Host Sequence Registers
The host sequence field selects the mode of operation for the time function selected
on a given channel. The meaning of the host sequence bits depends on the time func-
tion specified. Refer to Table 7-3, which is a summary of the host sequence and host
service request bits for each time function.
7.6.2.4 Host Service Registers
The host service request field selects the type of host service request for the time func-
tion selected on a given channel. The meaning of the host service request bits is de-
termined by time function microcode.
A host service request field cleared to %00 signals the host that service is completed
by the microengine on that channel. The host can request service on a channel by writ-
ing the corresponding host service request field to one of three nonzero states. It is a
good practice to monitor the host service request register and wait until the TPU clears
the service request before changing any parameters or issuing a new service request
to the channel.
7.6.2.5 Channel Priority Registers
The channel priority registers (CPR1, CPR2) assign one of three priority levels to a
channel or disable the channel. Table 7-3 indicates the number of time slots guaran-
teed for each channel priority encoding.
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USER’S MANUAL 7-15
7.6.3 Development Support and Test Registers
These registers are used for custom microcode development or for factory test. De-
scribing the use of the registers is beyond the scope of this manual. Register descrip-
tions are provided in APPENDIX D REGISTER SUMMARY. Refer to the
TPU
Reference Manual
(TPURM/AD) for more information.
Table 7-3 Channel Priority Encodings
CHX[1:0] Service Guaranteed Time
Slots
00 Disabled —
01 Low 1 out of 7
10 Middle 2 out of 7
11 High 4 out of 7
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MC68332 STANDBY RAM WITH TPU EMULATION
USER’S MANUAL 8-1
SECTION 8 STANDBY RAM WITH TPU EMULATION
The standby RAM module with TPU emulation capability (TPURAM) consists of a con-
trol register block and a 2-Kbyte array of fast (two bus cycle) static RAM, which is es-
pecially useful for system stacks and variable storage. The TPURAM responds to both
program and data space accesses. The TPURAM can be used to emulate TPU micro-
code ROM.
8.1 General
The TPURAM can be mapped to any 2-Kbyte boundary in the address map, but must
not overlap the module control registers. Refer to 8.3 TPURAM Array Address Map-
ping for more information. Data can be read or written in bytes, words or long words.
The TPURAM is powered by VDD in normal operation. During power-down, TPURAM
contents can be maintained by power from the VSTBY input. Power switching between
sources is automatic.
8.2 TPURAM Register Block
There are three TPURAM control registers: the TPURAM module configuration regis-
ter (TRAMMCR), the TPURAM test register (TRAMTST), and the TPURAM base ad-
dress and status register (TRAMBAR). To protect these registers from accidental
modification, they are always mapped to supervisor data space.
The TPURAM control register block begins at address $7FFB00 or $FFFB00, depend-
ing on the value of the module mapping (MM) bit in the SIM configuration register
(SIMCR). SECTION 4 SYSTEM INTEGRATION MODULE contains more information
about how the state of MM affects the system.
There is a 64-byte minimum control register block size for the TPURAM module. Un-
implemented register addresses are read as zeros, and writes have no effect. Refer
to APPENDIX D REGISTER SUMMARY for the register block address map and reg-
ister bit/field definitions.
8.3 TPURAM Array Address Mapping
Base address and status register TRAMBAR specifies the TPURAM array base ad-
dress in the MCU memory map. TRAMBAR[15:3] specify the 13 MSBs of the base ad-
dress. The TPU bus interface unit compares these bits to address lines ADDR[23:11].
If the two match, then the low order address lines and the SIZ[1:0] signals are used to
access the RAM location in the array. The TPURAM can be mapped to any 2-Kbyte
boundary in the address map, but must not overlap the module control registers. Over-
lap makes the registers inaccessible.
The RAM disable (RAMDS) bit, the LSB of the TRAMBAR, indicates whether the
TPURAM array is active (RAMDS = 0) or disabled (RAMDS = 1). The array is disabled
coming out of reset and remains disabled if the base address field is programmed with
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STANDBY RAM WITH TPU EMULATION MC68332
8-2 USER’S MANUAL
an address that overlaps the address of the module control register block. Writing a
valid base address to TRAMBAR[15:3] clears RAMDS and enables the array.
TRAMBAR can be written only once after a master reset. This prevents runaway soft-
ware from accidentally re-mapping the array. Because the locking mechanism is acti-
vated by the first write after a master reset, the base address field should be written in
a single word operation. Writing only one-half of the register prevents the other half
from being written. Note that in test mode the locking mechanism for TRAMBAR can
be disabled by the RTBA bit in the TRAMTST register.
8.4 TPURAM Privilege Level
The RASP field in TRAMMCR specifies whether access to the TPURAM module can
be made from the supervisor privilege level only or from either the user or supervisor
privilege level. If supervisor-only access is specified, an access from the user privilege
level is ignored by the TPURAM control logic and can be decoded externally. Refer to
SECTION 4 SYSTEM INTEGRATION MODULE and SECTION 5 CENTRAL PRO-
CESSING UNIT for more information concerning privilege levels.
8.5 Normal Operation
In normal operation, TPURAM is accessed via the IMB by a bus master and is pow-
ered by VDD. The array can be accessed by byte, word, or long word. A byte or aligned
word access takes one bus cycle (two system clock cycles). A long word access re-
quires two bus cycles. Refer to SECTION 4 SYSTEM INTEGRATION MODULE for
more information concerning access times.
During normal operation, the TPU does not access the array and has no effect on the
operation of the TPURAM module.
8.6 Standby Operation
Standby mode maintains the RAM array when the MCU main power supply is turned
off. Low-power mode allows the central processing unit to control MCU power con-
sumption.
Relative voltage levels of the VDD and VSTBY pins determine whether the TPURAM
is in standby mode. TPURAM circuitry switches to the standby power source when
specified limits are exceeded. If specified standby supply voltage levels are main-
tained during the transition, there is no loss of memory when switching occurs. The
RAM array cannot be accessed while the TPURAM module is powered from VSTBY.
If standby operation is not desired, connect the VSTBY pin to the VSS pin.
ISB exceeds specified maximum standby current during the time VDD makes the tran-
sition from normal operating level to the level specified for standby operation. This oc-
curs within the voltage range VSB – 0.5 V ≥ VDD ≥ VSS + 0.5 V. Typically, ISB peaks
when VDD» VSB – 1.5 V, and averages 1.0 mA over the transition period.
Refer to APPENDIX A ELECTRICAL CHARACTERISTICS for standby switching and
power consumption specifications.
To prevent standby supply voltage from going below the specified minimum, a filter ca-
pacitor must be attached between the VSTBY and VSS pins. To calculate filter capac-
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MC68332 STANDBY RAM WITH TPU EMULATION
USER’S MANUAL 8-3
itance, VDD supply ramp time, available standby voltage, and available standby
current
must be known. Assuming that the rate of change is constant as VDD changes
from 0.0 V to 5.5 V (nominal VSS to nominal VDD) and that VSB also drops during this
period, capacitance is calculated using the following expression:
Where:
C = Desired capacitance
I = ISB differential (Transient ISB – Available supply current)
t = time of maximum ISB (Typically in the range VSB – 1.5 V ± 0.5 V)
V = VSB differential (Available supply voltage – Specified minimum VSB)
8.7 Low-Power Stop Operation
Setting the STOP bit in the TRAMMCR switches the TPURAM module to low-power
mode. In low-power mode, the array retains its contents, but cannot be read or written
by the CPU. STOP can be written only when the processor is operating at the super-
visor privilege level. STOP is set during reset. Stop mode is exited by clearing STOP.
The TPURAM module will switch to standby mode while it is in low-power mode, pro-
vided the operating constraints discussed above are met.
8.8 Reset
Reset places the TPURAM in low-power mode, enables supervisor-level access only,
clears the base address, and disables the array. These actions make it possible to
write a new base address into the base address register.
When a synchronous reset occurs while a byte or word TPURAM access is in
progress, the access is completed. If reset occurs during the first word access of a
long-word operation, only the first word access is completed. If reset occurs during the
second word access of a long-word operation, the entire access is completed. Data
being read from or written to the TPURAM may be corrupted by asynchronous reset.
Refer to SECTION 4 SYSTEM INTEGRATION MODULE for more information con-
cerning resets.
8.9 TPU Microcode Emulation
The TPURAM array can emulate the microcode ROM in the TPU module. This pro-
vides a means of developing custom TPU code. The TPU selects TPU emulation
mode.
The TPU is connected to the TPURAM via a dedicated bus. While the TPURAM array
is in TPU emulation mode, the access timing of the TPURAM module matches the tim-
ing of the TPU microinstruction ROM to ensure accurate emulation. Normal accesses
through the IMB are inhibited and the control registers have no effect, allowing external
RAM to emulate the TPURAM at the same addresses. Refer to SECTION 7 TIME
PROCESSOR UNIT and to the
TPU Reference Manual
(TPURM/AD) for more infor-
mation.
CIt
V
----=
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STANDBY RAM WITH TPU EMULATION MC68332
8-4 USER’S MANUAL
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MC68332 ELECTRICAL CHARACTERISTICS
USER’S MANUAL A-1
APPENDIX A ELECTRICAL CHARACTERISTICS
This appendix contains electrical specification tables and reference timing diagrams.
NOTES:
1. Permanent damage can occur if maximum ratings are exceeded. Exposure to voltages or
currents in excess of recommended values affects device reliability. Device modules may
not operate normally while being exposed to electrical extremes.
2. Although sections of the device contain circuitry to protect against damage from high static
voltages or electrical fields, take normal precautions to avoid exposure to voltages higher
than maximum-rated voltages.
3. All pins except TSTME/TSC.
4. All functional non-supply pins are internally clamped to VSS. All functional pins except EX-
TAL and XFC are internally clamped to VDD.
5. Input must be current limited to the value specified. To determine the value of the required
current-limiting resistor, calculate resistance values for positive and negative clamp voltag-
es, then use the larger of the two values.
6. Power supply must maintain regulation within operating VDD range during instantaneous
and operating maximum current conditions.
7. This parameter is periodically sampled rather than 100% tested.
8. Total input current for all digital input-only and all digital input/output pins must not exceed
10 mA. Exceeding this limit can cause disruption of normal operation.
Table A-1 Maximum Ratings
Num Rating Symbol Value Unit
1 Supply Voltage1, 2, 7 VDD –0.3 to +6.5 V
2 Input Voltage1, 2, 3, 5, 7 Vin –0.3 to +6.5 V
3 Instantaneous Maximum Current
Single pin limit (applies to all pins)1, 5, 6, 7
ID25
mA
4 Operating Maximum Current
Digital Input Disruptive Current 4,5,6,7,8
VNEGCLMAP ≅ – 0.3 V
VPOSCLAMP ≅ VDD + 0.3
IID
–500 to 500
µA
5 Operating Temperature Range
MC68332 No Suffix
MC68332 “C” Suffix
MC68332 “V” Suffix
MC68332 “M” Suffix
TA
TL to TH
0 to 70
–40 to 85
–40 to 105
–40 to 125
°C
6 Storage Temperature Range Tstg –55 to 150 °C
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ELECTRICAL CHARACTERISTICS MC68332
A-2 USER’S MANUAL
Table A-2 Typical Ratings, 16.78 MHz Operation
Num Rating Symbol Value Unit
1 Supply Voltage VDD 5.0 V
2 Operating Temperature TA25 °C
3V
DD Supply Current
RUN
LPSTOP, VCO off
LPSTOP, External clock, maxi fsys
IDD 75
125
3
mA
µA
mA
4 Clock Synthesizer Operating Voltage VDDSYN 5.0 V
5V
DDSYN Supply Current
VCO on, maximum fsys
External Clock, maximum fsys
LPSTOP, VCO off
VDD powered down
IDDSYN 1.0
4.0
100
50
mA
mA
µA
µA
6 RAM Standby Voltage VSB 3.0 V
7 RAM Standby Current
Normal RAM operation
Standby operation
ISB 7.0
40 µA
µA
8 Power Dissipation PD455 mW
Table A-2a. Typical Ratings, 20.97 MHz Operation
Num Rating Symbol Value Unit
1 Supply Voltage VDD 5.0 V
2 Operating Temperature TA25 °C
3V
DD Supply Current
RUN
LPSTOP, VCO off
LPSTOP, External clock, maxi fsys
IDD 113
125
3.75
mA
µA
mA
4 Clock Synthesizer Operating Voltage VDDSYN 5.0 V
5V
DDSYN Supply Current
VCO on, maximum fsys
External Clock, maximum fsys
LPSTOP, VCO off
VDD powered down
IDDSYN 1.0
5.0
100
50
mA
mA
µA
µA
6 RAM Standby Voltage VSB 3.0 V
7 RAM Standby Current
Normal RAM operation
Standby operation
ISB 7.0
40 µA
µA
8 Power Dissipation PD570 mW
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MC68332 ELECTRICAL CHARACTERISTICS
USER’S MANUAL A-3
Notes:
The average chip-junction temperature (TJ) in C can be obtained from:
TJ = TA + (PD × ΘJA) (1)
where
TA = Ambient Temperature, °C
ΘJA = Package Thermal Resistance, Junction-to-Ambient, °C/W
PD= PINT
+ PI/O
PINT = IDD ×
VDD, Watts — Chip Internal Power
PI/O = Power Dissipation on Input and Output Pins — User Determined
For most applications PI/O < PINT and can be neglected. An approximate relationship between PD and TJ (if
PI/O is neglected) is:
PD = K ÷ (TJ + 273°C) (2)
Solving equations 1 and 2 for K gives:
K = PD + (TA + 273°C) + ΘJA × PD2(3)
where K is a constant pertaining to the particular part. K can be determined from equation (3) by measuring
PD (at equilibrium) for a known TA. Using this value of K, the values of PD and TJ can be obtained by solving
equations (1) and (2) iteratively for any value of TA.
Table A-3 Thermal Characteristics
Num Rating Symbol Value Unit
1 Thermal Resistance
Plastic 132-Pin Surface Mount
Plastic 144-Pin Surface Mount
Thin Plastic 144-Pin Surface Mount
ΘJA 38
46
49
°C/W
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ELECTRICAL CHARACTERISTICS MC68332
A-4 USER’S MANUAL
Table A-4 16.78 MHz Clock Control Timing
(VDD and VDDSYN = 5.0 Vdc ±10%, VSS = 0 Vdc, TA = TL to TH,
32.768 kHz reference)
Num Characteristic Symbol Min Max Unit
1 PLL Reference Frequency Range fref 25 50 kHz
2 System Frequency1dc 16.78
On-Chip PLL System Frequency fsys 0.131 16.78 MHz
External Clock Operation dc 16.78
3 PLL Lock Time2,3,4,5 tlpll —20ms
4 VCO Frequency6fVCO — 2 (fsys max) MHz
5 Limp Mode Clock Frequency
SYNCR X bit = 0
SYNCR X bit = 1
flimp —
—
fsys max /2
fsys max
MHz
6 CLKOUT Stability2,3,4,7
Short term (5 µs interval)
Long term (500 µs interval)
Cstab –0.5
–0.05
0.5
0.05
%
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MC68332 ELECTRICAL CHARACTERISTICS
USER’S MANUAL A-5
Notes For Tables 4 And 4a:
1. All internal registers retain data at 0 Hz.
2. This parameter is periodically sampled rather than 100% tested.
3. Assumes that a low-leakage external filter network is used to condition clock synthesizer input voltage. Total
external resistance from the XFC pin due to external leakage must be greater than 15 M Ω to guarantee this
specification. Filter network geometry can vary depending upon operating environment (See 4.3 System
Clock).
4. Proper layout procedures must be followed to achieve specifications.
5. Assumes that stable VDDSYN is applied, and that the crystal oscillator is stable. Lock time is measured from the
time VDD and VDDSYN are valid until RESET is released. This specification also applies to the period required
for PLL lock after changing the W and Y frequency control bits in the synthesizer control register (SYNCR) while
the PLL is running, and to the period required for the clock to lock after LPSTOP.
6. Internal VCO frequency (fVCO) is determined by SYNCR W and Y bit values. The SYNCR X bit controls a divide-
by-two circuit that is not in the synthesizer feedback loop. When X = 0, the divider is enabled, and fsys = fVCO
÷ 4. When X = 1, the divider is disabled, and fsys = fVCO ÷ 2. X must equal one when operating at maximum
specified fsys.
7. Stability is the average deviation from the programmed frequency measured over the specified interval at max-
imum fsys. Measurements are made with the device powered by filtered supplies and clocked by a stable ex-
ternal clock signal. Noise injected into the PLL circuitry via VDDSYN and VSS and variation in crystal oscillator
frequency increase the Cstab percentage for a given interval. When clock stability is a critical constraint on con-
trol system operation, this parameter should be measured during functional testing of the final system.
Table A-4a. 20.97 MHz Clock Control Timing
(VDD and VDDSYN = 5.0 Vdc ±5%, VSS = 0 Vdc, TA = TL to TH,
32.768 kHz reference)
Num Characteristic Symbol Min Max Unit
1 PLL Reference Frequency Range fref 25 50 kHz
2 System Frequency1dc 20.97
On-Chip PLL System Frequency fsys 0.131 20.97 MHz
External Clock Operation dc 20.97
3 PLL Lock Time2,3,4,5 tlpll —20ms
4 VCO Frequency6fVCO — 2 (fsys max) MHz
5 Limp Mode Clock Frequency
SYNCR X bit = 0
SYNCR X bit = 1
flimp —
—
fsys max/2
fsys max
MHz
6 CLKOUT Stability2,3,4,7
Short term (5 µs interval)
Long term (500 µs interval)
Cstab –0.5
–0.05
0.5
0.05
%
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ELECTRICAL CHARACTERISTICS MC68332
A-6 USER’S MANUAL
Table A-5 16.78 MHz DC Characteristics
(VDD and VDDSYN = 5.0 Vdc ± 10%, VSS = 0 Vdc, TA = TL to TH)
Num Characteristic Symbol Min Max Unit
1 Input High Voltage VIH 0.7 (VDD)V
DD + 0.3 V
2 Input Low Voltage VIL VSS – 0.3 0.2 (VDD)V
3 Input Hysteresis1 VHYS 0.5 — V
4 Input Leakage Current2
Vin = VDD or VSS Input-only pins
Iin –2.5 2.5 µA
5 High Impedance (Off-State) Leakage Current2
Vin = VDD or VSSAll input/output and output pins
IOZ –2.5 2.5 µA
6 CMOS Output High Voltage2, 3
IOH = –10.0 µAGroup 1, 2, 4 input/output and all output pins
VOH VDD – 0.2 — V
7 CMOS Output Low Voltage2
IOL = 10.0 µAGroup 1, 2, 4 input/output and all output pins
VOL — 0.2 V
8 Output High Voltage2, 3
IOH = –0.8 mAGroup 1, 2, 4 input/output and all output pins
VOH VDD – 0.8 — V
9 Output Low Voltage2
IOL = 1.6 mAGroup 1 I/O Pins, CLKOUT, FREEZE/QUOT, IPIPE
IOL = 5.3 mAGroup 2 and Group 4 I/O Pins, CSBOOT, BG/CS
IOL = 12 mAGroup 3
VOL —
—
—
0.4
0.4
0.4
V
10 Three State Control Input High Voltage VIHTSC 1.6 (VDD) 9.1 V
11 Data Bus Mode Select Pull-up Current5
Vin = VILDATA[15:0]
Vin = VIHDATA[15:0]
IMSP —
–15
–120
—
µA
12 VDD Supply Current6
RUN 4
RUN, TPU emulation mode
LPSTOP, 32.768 kHz crystal, VCO Off (STSIM = 0)
LPSTOP (External clock input frequency = maximum fsys)
IDD
IDD
SIDD
SIDD
—
—
—
—
124
134
350
5
mA
mA
µA
mA
13 Clock Synthesizer Operating Voltage VDDSYN 4.5 5.5 V
14 VDDSYN Supply Current6
32.768 kHz crystal, VCO on, maximum fsys
External Clock, maximum fsys
LPSTOP, 32.768 kHz crystal, VCO off (STSIM = 0)
32.768 kHz crystal, VDD powered down
IDDSYN
IDDSYN
SIDDSYN
IDDSYN
—
—
—
—
1
5
150
100
mA
mA
µA
µA
15 RAM Standby Voltage7
Specified VDD applied
VDD = VSS
VSB 0.0
3.0
5.5
5.5
V
16 RAM Standby Current6,7,10
Normal RAM operationVDD > VSB – 0.5 V
Transient conditionVSB – 0.5 V ≥ VDD ≥ VSS + 0.5 V
Standby operationVDD < VSS + 0.5 V
ISB —
—
—
10
3
60
µA
mA
µA
17 Power Dissipation8PD— 690 mW
18 Input Capacitance2, 9All input-only pins
All input/output pins
Cin —
—
10
20
pF
19 Load Capacitance2
Group 1 I/O Pins and CLKOUT, FREEZE/QUOT, IPIPE
Group 2 I/O Pins and CSBOOT, BG/CS
Group 3 I/O pins
Group 4 I/O pins
CL—
—
—
—
90
100
130
200
pF
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MC68332 ELECTRICAL CHARACTERISTICS
USER’S MANUAL A-7
Table A-5a. 20.97 MHz DC Characteristics
(VDD and VDDSYN = 5.0 Vdc ± 5%, VSS = 0 Vdc, TA = TL to TH)
Num Characteristic Symbol Min Max Unit
1 Input High Voltage VIH 0.7 (VDD)V
DD + 0.3 V
2 Input Low Voltage VIL VSS – 0.3 0.2 (VDD)V
3 Input Hysteresis1 VHYS 0.5 — V
4 Input Leakage Current2
Vin = VDD or VSS Input-only pins
Iin –2.5 2.5 µA
5 High Impedance (Off-State) Leakage Current2
Vin = VDD or VSSAll input/output and output pins
IOZ –2.5 2.5 µA
6 CMOS Output High Voltage2, 3
IOH = –10.0 µAGroup 1, 2, 4 input/output and all output pins
VOH VDD – 0.2 — V
7 CMOS Output Low Voltage2
IOL = 10.0 µAGroup 1, 2, 4 input/output and all output pins
VOL — 0.2 V
8 Output High Voltage2, 3
IOH = –0.8 mAGroup 1, 2, 4 input/output and all output pins
VOH VDD – 0.8 — V
9 Output Low Voltage2
IOL = 1.6 mAGroup 1 I/O Pins, CLKOUT, FREEZE/QUOT, IPIPE
IOL = 5.3 mAGroup 2 and Group 4 I/O Pins, CSBOOT, BG/CS
IOL = 12 mAGroup 3
VOL —
—
—
0.4
0.4
0.4
V
10 Three State Control Input High Voltage VIHTSC 1.6 (VDD) 9.1 V
11 Data Bus Mode Select Pull-up Current5
Vin = VILDATA[15:0]
Vin = VIHDATA[15:0]
IMSP —
–15
–120
—
µA
12 VDD Supply Current6
RUN 4
RUN, TPU emulation mode
LPSTOP, 32.768 kHz crystal, VCO Off (STSIM = 0)
LPSTOP (External clock input frequency = maximum fsys)
IDD
IDD
SIDD
SIDD
—
—
—
—
140
150
350
5
mA
mA
µA
mA
13 Clock Synthesizer Operating Voltage VDDSYN 4.75 5.25 V
14 VDDSYN Supply Current6
32.768 kHz crystal, VCO on, maximum fsys
External Clock, maximum fsys
LPSTOP, 32.768 kHz crystal, VCO off (STSIM = 0)
32.768 kHz crystal, VDD powered down
IDDSYN
IDDSYN
SIDDSYN
IDDSYN
—
—
—
—
2
6
150
100
mA
mA
µA
µA
15 RAM Standby Voltage7
Specified VDD applied
VDD = VSS
VSB 0.0
3.0
5.25
5.25
V
16 RAM Standby Current6,7,10
Normal RAM operationVDD > VSB – 0.5 V
Transient conditionVSB – 0.5 V ≥ VDD ≥ VSS + 0.5 V
Standby operationVDD < VSS + 0.5 V
ISB —
—
10
3
50
µA
mA
µA
17 Power Dissipation8PD— 766 mW
18 Input Capacitance2, 9All input-only pins
All input/output pins
Cin —
—
10
20
pF
19 Load Capacitance2
Group 1 I/O Pins and CLKOUT, FREEZE/QUOT, IPIPE
Group 2 I/O Pins and CSBOOT, BG/CS
Group 3 I/O pins
Group 4 I/O pins
CL—
—
—
—
90
100
130
200
pF
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ELECTRICAL CHARACTERISTICS MC68332
A-8 USER’S MANUAL
Notes for Tables A–5 and A–5a:
1. Applies to:
Port E [7:4] — SIZ[1:0], AS, DS
Port F [7:0] — IRQ[7:1], MODCLK
Port QS [7:0] — TXD, PCS[3:1],ÊPCS0/SS, SCK, MOSI, MISO
TPUCH[15:0], T2CLK
BKPT/DSCLK, IFETCH, RESET, RXD, TSTME/TSC
EXTAL (when PLL enabled)
2. Input-Only Pins: EXTAL, TSTME/TSC, BKPT, T2CLK, RXD
Output-Only Pins: CSBOOT, BG/CS, CLKOUT, FREEZE/QUOT, IPIPE
Input/Output Pins:
Group 1: DATA[15:0], IFETCH, TPUCH[15:0]
Group 2: Port C [6:0] — ADDR[22:19]/CS[9:6], FC[2:0]/CS[5:3]
Port E [7:0] — SIZ[1:0], AS, DS, AVEC, RMC, DSACK[1:0]
Port F [&:0] — IRQ[7:1], MODCLK
Port QS [7:3] — TXD, PCS[3:1], PCS0/SS
ADDR23/CS10/ECLK, ADDR[18:0], R/W, BERR, BR/CS0, BGACK/CS2
Group 3: HALT, RESET
Group 4: MISO, MOSI, SCK
3. Does not apply to HALT and RESET because they are open drain pins. Does not apply to Port QS [7:0] (TXD,
PCS[3:1],ÊPCS0/SS, SCK, MOSI, MISO) in wired-OR mode.
4. Current measured with system clock frequency of 16.78 MHz, all modules active.
5. Use of an active pulldown device is recommended.
6. Total operating current is the sum of the appropriate IDD, IDDSYN, and ISB values. IDD values include supply cur-
rents for device modules powered by VDDE and VDDI pins.
7. The RAM module will not switch into standby mode as long as VSB does not exceed VDD by more than 0.5
Volt. The RAM array cannot be accessed while the module is in standby mode.
8. Power dissipation measured at specified system clock frequency, all modules active. Power dissipation can be
calculated using the expression:
PD = Maximum VDD (IDD + IDDSYN + ISB)
IDD includes supply currents for all device modules powered by VDDE and VDDI pins.
9. This parameter is periodically sampled rather than 100% tested.
10. When VDD is transitioning during power-up or power down sequence, and VSB is applied, current flows between
the VSTBY and VDD pins, which causes standby current to increase toward the maximum transient condition spec-
ification. System noise on the VDD and VSTBY pins can contribute to this condition.
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MC68332 ELECTRICAL CHARACTERISTICS
USER’S MANUAL A-9
Table A-6 16.78 MHz AC Timing
(VDD and VDDSYN = 5.0 Vdc ± 10%, VSS = 0 Vdc, TA = TL to TH)
Num Characteristic Symbol Min Max Unit
F1 Frequency of Operation (32.768 kHz crystal)2f 0.13 16.78 MHz
1 Clock Period tcyc 59.6 — ns
1A ECLK Period tEcyc 476 — ns
1B External Clock Input Period3tXcyc 59.6 — ns
2, 3 Clock Pulse Width tCW 24 — ns
2A, 3A ECLK Pulse Width tECW 236 — ns
2B, 3B External Clock Input High/Low Time3tXCHL 29.8 — ns
4, 5 Clock Rise and Fall Time tCrf —5ns
4A, 5A Rise and Fall Time — All Outputs except CLKOUT trf —8ns
4B, 5B External Clock Rise and Fall Time4tXCrf —5ns
6 Clock High to Address, FC, SIZE, RMC Valid tCHAV 029ns
7 Clock High to Address, Data, FC, SIZE, RMC High Impedance tCHAZx 059ns
8 Clock High to Address, FC, SIZE, RMC Invalid tCHAZn 0—ns
9 Clock Low to AS, DS, CS Asserted tCLSA 225ns
9A AS to DS or CS Asserted (Read)5tSTSA –15 15 ns
9C Clock Low to IFETCH, IPIPE Asserted tCLIA 222ns
11 Address, FC, SIZE, RMC Valid
to AS, CS Asserted
tAVSA 15 — ns
12 Clock Low to AS, DS, CS Negated tCLSN 229ns
12A Clock Low to IFETCH, IPIPE Negated tCLIN 222ns
13 AS, DS, CS Negated to
Address, FC, SIZE Invalid (Address Hold)
tSNAI 15 — ns
14 AS, CS Width Asserted tSWA 100 — ns
14A DS, CS Width Asserted (Write) tSWAW 45 — ns
14B AS, CS Width Asserted (Fast Write Cycle) tSWDW 40 — ns
15 AS, DS, CS Width Negated6tSN 40 — ns
16 Clock High to AS, DS, R/W High Impedance tCHSZ —59ns
17 AS, DS, CS Negated to R/W Negated tSNRN 15 — ns
18 Clock High to R/W High tCHRH 029ns
20 Clock High to R/W Low tCHRL 029ns
21 R/W Asserted to AS, CS Asserted tRAAA 15 — ns
22 R/W Low to DS, CS Asserted (Write) tRASA 70 — ns
23 Clock High to Data Out Valid tCHDO —29ns
24 Data Out Valid to Negating Edge of AS, CS t
DVASN 15 — ns
25 DS, CS Negated to Data Out Invalid (Data Out Hold) tSNDOI 15 — ns
26 Data Out Valid to DS, CS Asserted (Write) tDVSA 15 — ns
27 Data In Valid to Clock Low (Data Setup) tDICL 5—ns
27A Late BERR, HALT Asserted to Clock Low (Setup Time) tBELCL 20 — ns
28 AS, DS Negated to DSACK[1:0], BERR, HALT, AVEC Negated tSNDN 080ns
29 DS, CS Negated to Data In Invalid (Data In Hold)7tSNDI 0—ns
29A DS, CS Negated to Data In High Impedance7, 8 tSHDI —55ns
30 CLKOUT Low to Data In Invalid (Fast Cycle Hold)7tCLDI 15 — ns
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ELECTRICAL CHARACTERISTICS MC68332
A-10 USER’S MANUAL
30A CLKOUT Low to Data In High Impedance7tCLDH —90ns
31 DSACK[1:0] Asserted to Data In Valid9tDADI —50ns
33 Clock Low to BG Asserted/Negated tCLBAN —29ns
35 BR Asserted to BG Asserted (RMC Not Asserted)10 tBRAGA 1—t
cyc
37 BGACK Asserted to BG Negated tGAGN 12t
cyc
39 BG Width Negated tGH 2—t
cyc
39A BG Width Asserted tGA 1—t
cyc
46 R/W Width Asserted (Write or Read) tRWA 150 — ns
46A R/W Width Asserted (Fast Write or Read Cycle) tRWAS 90 — ns
47A Asynchronous Input Setup Time
BR, BGACK, DSACK[1:0], BERR, AVEC, HALT
tAIST 5—ns
47B Asynchronous Input Hold Time tAIHT 15 — ns
48 DSACK[1:0] Asserted to BERR, HALT Asserted11 tDABA —30ns
53 Data Out Hold from Clock High tDOCH 0—ns
54 Clock High to Data Out High Impedance tCHDH —28ns
55 R/W Asserted to Data Bus Impedance Change tRADC 40 — ns
56 RESET Pulse Width (Reset Instruction) tHRPW 512 — tcyc
57 BERR Negated to HALT Negated (Rerun) tBNHN 0—ns
70 Clock Low to Data Bus Driven (Show) tSCLDD 029ns
71 Data Setup Time to Clock Low (Show) tSCLDS 15 — ns
72 Data Hold from Clock Low (Show) tSCLDH 10 — ns
73 BKPT Input Setup Time tBKST 15 — ns
74 BKPT Input Hold Time tBKHT 10 — ns
75 Mode Select Setup Time tMSS 20 — tcyc
76 Mode Select Hold Time tMSH 0—ns
77 RESET Assertion Time12 tRSTA 4—t
cyc
78 RESET Rise Time13 tRSTR —10t
cyc
Table A-6 16.78 MHz AC Timing (Continued)
(VDD and VDDSYN = 5.0 Vdc ± 10%, VSS = 0 Vdc, TA = TL to TH)
Num Characteristic Symbol Min Max Unit
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MC68332 ELECTRICAL CHARACTERISTICS
USER’S MANUAL A-11
Table A-6a. 20.97 MHz AC Timing
(VDD and VDDSYN = 5.0 Vdc ± 5%, VSS = 0 Vdc, TA = TL to TH)
Num Characteristic Symbol Min Max Unit
F1 Frequency of Operation (32.768 kHz crystal)2f 0.13 20.97 MHz
1 Clock Period tcyc 47.7 — ns
1A ECLK Period tEcyc 381 — ns
1B External Clock Input Period3tXcyc 47.7 — ns
2, 3 Clock Pulse Width tCW 18.8 — ns
2A, 3A ECLK Pulse Width tECW 183 — ns
2B, 3B External Clock Input High/Low Time3tXCHL 23.8 — ns
4, 5 Clock Rise and Fall Time tCrf —5ns
4A, 5A Rise and Fall Time — All Outputs except CLKOUT trf —8ns
4B, 5B External Clock Rise and Fall Time4tXCrf —5ns
6 Clock High to Address, FC, SIZE, RMC Valid tCHAV 023ns
7 Clock High to Address, Data, FC, SIZE, RMC High Impedance tCHAZx 047ns
8 Clock High to Address, FC, SIZE, RMC Invalid tCHAZn 0—ns
9 Clock Low to AS, DS, CS Asserted tCLSA 023ns
9A AS to DS or CS Asserted (Read)5tSTSA –10 10 ns
9C Clock Low to IFETCH, IPIPE Asserted tCLIA 222ns
11 Address, FC, SIZE, RMC Valid
to AS, CS Asserted
tAVSA 10 — ns
12 Clock Low to AS, DS, CS Negated tCLSN 223ns
12A Clock Low to IFETCH, IPIPE Negated tCLIN 222ns
13 AS, DS, CS Negated to
Address, FC, SIZE Invalid (Address Hold)
tSNAI 10 — ns
14 AS, CS Width Asserted tSWA 80 — ns
14A DS, CS Width Asserted (Write) tSWAW 36 — ns
14B AS, CS Width Asserted (Fast Write Cycle) tSWDW 32 — ns
15 AS, DS, CS Width Negated6tSN 32 — ns
16 Clock High to AS, DS, R/W High Impedance tCHSZ —47ns
17 AS, DS, CS Negated to R/W Negated tSNRN 10 — ns
18 Clock High to R/W High tCHRH 023ns
20 Clock High to R/W Low tCHRL 023ns
21 R/W Asserted to AS, CS Asserted tRAAA 10 — ns
22 R/W Low to DS, CS Asserted (Write) tRASA 54 — ns
23 Clock High to Data Out Valid tCHDO —23ns
24 Data Out Valid to Negating Edge of AS, CS t
DVASN 10 — ns
25 DS, CS Negated to Data Out Invalid (Data Out Hold) tSNDOI 10 — ns
26 Data Out Valid to DS, CS Asserted (Write) tDVSA 10 — ns
27 Data In Valid to Clock Low (Data Setup) tDICL 5—ns
27A Late BERR, HALT Asserted to Clock Low (Setup Time) tBELCL 15 — ns
28 AS, DS Negated to DSACK[1:0], BERR, HALT, AVEC Negated tSNDN 060ns
29 DS, CS Negated to Data In Invalid (Data In Hold)7tSNDI 0—ns
29A DS, CS Negated to Data In High Impedance7, 8 tSHDI —48ns
30 CLKOUT Low to Data In Invalid (Fast Cycle Hold)7tCLDI 10 — ns
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ELECTRICAL CHARACTERISTICS MC68332
A-12 USER’S MANUAL
30A CLKOUT Low to Data In High Impedance7tCLDH —72ns
31 DSACK[1:0] Asserted to Data In Valid9tDADI —46ns
33 Clock Low to BG Asserted/Negated tCLBAN —23ns
35 BR Asserted to BG Asserted (RMC Not Asserted)10 tBRAGA 1—t
cyc
37 BGACK Asserted to BG Negated tGAGN 12t
cyc
39 BG Width Negated tGH 2—t
cyc
39A BG Width Asserted tGA 1—t
cyc
46 R/W Width Asserted (Write or Read) tRWA 115 — ns
46A R/W Width Asserted (Fast Write or Read Cycle) tRWAS 70 — ns
47A Asynchronous Input Setup Time
BR, BGACK, DSACK[1:0], BERR, AVEC, HALT
tAIST 5—ns
47B Asynchronous Input Hold Time tAIHT 12 — ns
48 DSACK[1:0] Asserted to BERR, HALT Asserted11 tDABA —30ns
53 Data Out Hold from Clock High tDOCH 0—ns
54 Clock High to Data Out High Impedance tCHDH —23ns
55 R/W Asserted to Data Bus Impedance Change tRADC 32 — ns
56 RESET Pulse Width (Reset Instruction) tHRPW 512 — tcyc
57 BERR Negated to HALT Negated (Rerun) tBNHN 0—ns
70 Clock Low to Data Bus Driven (Show) tSCLDD 023ns
71 Data Setup Time to Clock Low (Show) tSCLDS 10 — ns
72 Data Hold from Clock Low (Show) tSCLDH 10 — ns
73 BKPT Input Setup Time tBKST 10 — ns
74 BKPT Input Hold Time tBKHT 10 — ns
75 Mode Select Setup Time tMSS 20 — tcyc
76 Mode Select Hold Time tMSH 0—ns
77 RESET Assertion Time12 tRSTA 4—t
cyc
78 RESET Rise Time13,14 tRSTR —10t
cyc
Table A-6a. 20.97 MHz AC Timing (Continued)
(VDD and VDDSYN = 5.0 Vdc ± 5%, VSS = 0 Vdc, TA = TL to TH)
Num Characteristic Symbol Min Max Unit
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MC68332 ELECTRICAL CHARACTERISTICS
USER’S MANUAL A-13
Notes for Tables A–6 and A–6a:
1.All AC timing is shown with respect to 20% VDD and 70% VDD levels unless otherwise noted.
2.Minimum system clock frequency is four times the crystal frequency, subject to specified limits.
3.When an external clock is used, minimum high and low times are based on a 50% duty cycle. The minimum al-
lowable tXcyc period is reduced when the duty cycle of the external clock signal varies. The relationship between
external clock input duty cycle and minimum tXcyc is expressed:
Minimum tXcyc period = minimum tXCHL / (50% – external clock input duty cycle tolerance).
4.Parameters for an external clock signal applied while the internal PLL is disabled (MODCLK pin held low during
reset). Does not pertain to an external VCO reference applied while the PLL is enabled (MODCLK pin held high
during reset). When the PLL is enabled, the clock synthesizer detects successive transitions of the reference sig-
nal. If transitions occur within the correct clock period, rise/fall times and duty cycle are not critical.
5.Specification 9A is the worst-case skew between AS and DS or CS. The amount of skew depends on the relative
loading of these signals. When loads are kept within specified limits, skew will not cause AS and DS to fall outside
the limits shown in specification 9.
6.If multiple chip selects are used, CS width negated (specification 15) applies to the time from the negation of a
heavily loaded chip select to the assertion of a lightly loaded chip select. The CS width negated specification be-
tween multiple chip selects does not apply to chip selects being used for synchronous ECLK cycles.
7.Hold times are specified with respect to DS or CS on asynchronous reads and with respect to CLKOUT on fast
cycle reads. The user is free to use either hold time.
8.Maximum value is equal to (tcyc / 2) + 25 ns.
9.If the asynchronous setup time (specification 47A) requirements are satisfied, the DSACK[1:0] low to data setup
time (specification 31) and DSACK[1:0] low to BERR low setup time (specification 48) can be ignored. The data
must only satisfy the data-in to clock low setup time (specification 27) for the following clock cycle. BERR must
satisfy only the late BERR low to clock low setup time (specification 27A) for the following clock cycle.
10. To ensure coherency during every operand transfer, BG will not be asserted in response to BR until after all cy-
cles of the current operand transfer are complete and RMC is negated.
11. In the absence of DSACK[1:0], BERR is an asynchronous input using the asynchronous setup time (specification
47A).
12. After external RESET negation is detected, a short transition period (approximately 2 tcyc) elapses, then the SIM
drives RESET low for 512 tcyc.
13.External assertion of the RESET input can overlap internally-generated resets. To insure that an external reset
is recognized in all cases, RESET must be asserted for at least 590 CLKOUT cycles.
14. External logic must pull RESET high during this period in order for normal MCU operation to begin.
15. Address access time = (2.5 + WS) tcyc – tCHAV – tDICL
Chip select access time = (2 + WS) tcyc – tCLSA – tDICL
Where: WS = number of wait states. When fast termination is used (2 clock bus) WS = –1.
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ELECTRICAL CHARACTERISTICS MC68332
A-14 USER’S MANUAL
NOTE: Timing shown with respect to 20% and 70% VDD.
Figure A-1 CLKOUT Output Timing Diagram
NOTE: Timing shown with respect to 20% and 70% VDD. Pulse width shown with respect to 50% VDD.
Figure A-2 External Clock Input Timing Diagram
NOTE: Timing shown with respect to 20% and 70% VDD.
Figure A-3 ECLK Output Timing Diagram
68300 CLKOUT TIM
CLKOUT
NOTE: Timing shown with respect to 20% and 70% VDD.
4
5
2
1
3
68300 EXT CLK INPUT TIM
EXTAL
4B
5B
2B
1B
3B
68300 ECLK OUTPUT TIM
ECLK
4A
5A
2A
1A
3A
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MC68332 ELECTRICAL CHARACTERISTICS
USER’S MANUAL A-15
Figure A-4 Read Cycle Timing Diagram
68300 RD CYC TIM
CLKOUT
S0 S1 S2 S3 S4 S5
54
21
11
13
86
A20–A23
FC0–FC2
SIZ0, SIZ1
DS
CS
R/W
AS
DSACK0
DSACK1
D0–D15
BERR
20
HALT
BKPT
9
15
14
12
46
17
47A 28
22
25
55
48
73 74
27A
53
26
14A
9
23
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ELECTRICAL CHARACTERISTICS MC68332
A-16 USER’S MANUAL
Figure A-5 Write Cycle Timing Diagram
68300 WR CYC TIM
CLKOUT
S0 S1 S2 S3 S4 S5
54
21
11
13
86
A20–A23
FC0–FC2
SIZ0, SIZ1
DS
CS
R/W
AS
DSACK0
DSACK1
D0–D15
BERR
20
HALT
BKPT
9
15
14
12
46
17
47A 28
22
25
55
48
73 74
27A
53
26
14A
9
23
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MC68332 ELECTRICAL CHARACTERISTICS
USER’S MANUAL A-17
Figure A-6 Fast Termination Read Cycle Timing Diagram
68300 FAST RD CYC TIM
CLKOUT
S0 S1 S4 S5 S0
A0–A23
FC0–FC2
SIZ0, SIZ1
DS
CS
R/W
AS
D0–D15
BKPT
8
6
14B
129
20
18 46A
30
27
73 29A
30A
74
29
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ELECTRICAL CHARACTERISTICS MC68332
A-18 USER’S MANUAL
Figure A-7 Fast Termination Write Cycle Timing Diagram
68300 FAST WR CYC TIM
CLKOUT
S0 S1 S4 S5 S0
A0–A23
FC0–FC2
SIZ0, SIZ1
DS
CS
R/W
AS
D0–D15
BKPT
86
912
14B
20 46A
23
24 18
25
73 74
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MC68332 ELECTRICAL CHARACTERISTICS
USER’S MANUAL A-19
Figure A-8 Bus Arbitration Timing Diagram —Active Bus Case
68300 BUS ARB TIM
CLKOUT
S0 S1 S2 S3 S4
A0–A23
D0–D15
S98 A5 A5 A2S5
AS
DS
R/W
DSACK0
DSACK1
BR
BG
BGACK
47A
35
33
37
7
16
33
39A
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ELECTRICAL CHARACTERISTICS MC68332
A-20 USER’S MANUAL
Figure A-9 Bus Arbitration Timing Diagram — Idle Bus Case
NOTE: Show cycles can stretch during S42 when bus accesses take longer than two cycles due to IMB module
wait-state insertion.
Figure A-10 Show Cycle Timing Diagram
68300 BUS ARB TIM IDLE
CLKOUT
A0 A5
A0–A23
D0–D15
A2 A3 A0A5
BR
AS
BG
BGACK
33 33
47A
37
47A
35
47A
CLKOUT
S0 S41 S42 S0 S1 S2
A0–A23
R/W
AS
DS
D0–D15
BKPT
S43
68300 SHW CYC TIM
6 8
12
9
18
20
72
71
70
73 74
15
SHOW CYCLE START OF
EXTERNAL CYCLE
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MC68332 ELECTRICAL CHARACTERISTICS
USER’S MANUAL A-21
NOTE: AS and DS timing shown for reference only.
Figure A-11 Chip Select Timing Diagram
Figure A-12 Reset and Mode Select Timing Diagram
68300 CHIP SEL TIM
S0 S1 S2 S3 S4 S5 S0 S1 S2 S3 S4 S5
CLKOUT
A0–A23
FC0–FC2
SIZ0, SIZ1
AS
DS
CS
R/W
D0–D15
66 8
11
12
13
99
14
11
9
14
15
25
20 18
17
12 21
17
18
21
23
29A
27 53 54
46 55
29
14A
46
68300 RST/MODE SEL TIM
RESET
D0–D15
75
77 78
76
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ELECTRICAL CHARACTERISTICS MC68332
A-22 USER’S MANUAL
NOTES:
1. All AC timing is shown with respect to 20% VDD and 70% VDD levels unless otherwise noted.
Table A-7 Background Debugging Mode Timing
(VDD = 5.0 Vdc ± 10%, VSS = 0 Vdc, TA = TL to TH)
Num Characteristic Symbol Min Max Unit
B0 DSI Input Setup Time tDSISU 15 — ns
B1 DSI Input Hold Time tDSIH 10 — ns
B2 DSCLK Setup Time tDSCSU 15 — ns
B3 DSCLK Hold Time tDSCH 10 — ns
B4 DSO Delay Time tDSOD —25ns
B5 DSCLK Cycle Time tDSCCYC 2 — tcyc
B6 CLKOUT High to FREEZE Asserted/Negated tFRZAN —50ns
B7 CLKOUT High to IFETCH High Impedance tIFZ —50ns
B8 CLKOUT High to IFETCH Valid tIF —50ns
B9 DSCLK Low Time tDSCLO 1—t
cyc
B10 FREEZE Asserted to IFETCH Valid tFRZIF TBD — tcyc
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MC68332 ELECTRICAL CHARACTERISTICS
USER’S MANUAL A-23
Figure A-13 Background Debugging Mode Timing Diagram —
Serial Communication
Figure A-14 Background Debugging Mode Timing Diagram —
Freeze Assertion
68300 BKGD DBM SER COM TIM
CLKOUT
FREEZE
BKPT/DSCLK
IFETCH/DSI
IPIPE/DSO
B1
B2
B0
B9
B3
B4
B5
68300 BKGD DBM FRZ TIM
CLKOUT
FREEZE
IFETCH/DSI
B10
B8
B7 B10 B6
B6
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ELECTRICAL CHARACTERISTICS MC68332
A-24 USER’S MANUAL
Notes for Tables A–8 and A–8a:
1. All AC timing is shown with respect to 20% VDD and 70% VDD levels unless otherwise noted.
2. When the previous bus cycle is not an ECLK cycle, the address may be valid before ECLK goes low.
3. Address access time = tEcyc – tEAD – tEDSR.
4. Chip select access time = tEcyc – tECSD – tEDSR.
Table A-8 16.78 MHz ECLK Bus Timing
(VDD = 5.0 Vdc ± 10%, VSS = 0 Vdc, TA = TL to TH)
Num Characteristic Symbol Min Max Unit
E1 ECLK Low to Address Valid2tEAD —60ns
E2 ECLK Low to Address Hold tEAH 15 — ns
E3 ECLK Low to CS Valid (CS delay) tECSD — 150 ns
E4 ECLK Low to CS Hold tECSH 15 — ns
E5 CS Negated Width tECSN 30 — ns
E6 Read Data Setup Time tEDSR 30 — ns
E7 Read Data Hold Time tEDHR 5—ns
E8 ECLK Low to Data High Impedance tEDHZ —60ns
E9 CS Negated to Data Hold (Read) tECDH 0—ns
E10 CS Negated to Data High Impedance tECDZ —1t
cyc
E11 ECLK Low to Data Valid (Write) tEDDW —2t
cyc
E12 ECLK Low to Data Hold (Write) tEDHW 15 — ns
E13 Address Access Time (Read)3tEACC 386 — ns
E14 Chip Select Access Time (Read)4tEACS 296 — ns
E15 Address Setup Time tEAS 1/2 — tcyc
Table A-8a 20.97 MHz ECLK Bus Timing
(VDD = 5.0 Vdc ± 5%, VSS = 0 Vdc, TA = TL to TH)
Num Characteristic Symbol Min Max Unit
E1 ECLK Low to Address Valid2tEAD —48ns
E2 ECLK Low to Address Hold tEAH 10 — ns
E3 ECLK Low to CS Valid (CS delay) tECSD — 120 ns
E4 ECLK Low to CS Hold tECSH 10 — ns
E5 CS Negated Width tECSN 25 — ns
E6 Read Data Setup Time tEDSR 25 — ns
E7 Read Data Hold Time tEDHR 5—ns
E8 ECLK Low to Data High Impedance tEDHZ —48ns
E9 CS Negated to Data Hold (Read) tECDH 0—ns
E10 CS Negated to Data High Impedance tECDZ —1t
cyc
E11 ECLK Low to Data Valid (Write) tEDDW —2t
cyc
E12 ECLK Low to Data Hold (Write) tEDHW 10 — ns
E13 Address Access Time (Read)3tEACC 308 — ns
E14 Chip Select Access Time (Read)4tEACS 236 — ns
E15 Address Setup Time tEAS 1/2 — tcyc
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MC68332 ELECTRICAL CHARACTERISTICS
USER’S MANUAL A-25
NOTE: Shown with ECLK = system clock/8 — EDIV bit in clock synthesizer control register (SYNCR) = 0.
Figure A-15 ECLK Timing Diagram
68300 E CYCLE TIM
CLKOUT
A0–A23
CS
ECLK
D0–D15
D0–D15
WRITEREAD
WRITE
R/W
2A
1A
3A
E1 E2
E4
E9
E14
E13
E6
E15
E3
E10
E7
E12
E8
E11
E5
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ELECTRICAL CHARACTERISTICS MC68332
A-26 USER’S MANUAL
Notes:
1. All AC timing is shown with respect to 20% VDD and 70% VDD levels unless otherwise noted.
2. In formula, n = External SCK rise + External SCK fall time
3. Data can be recognized properly with longer transition times as long as MOSI/MISO signals from external sourc-
es are at valid VOH/VOL prior to SCK transitioning between valid VOL and VOH. Due to process variation, logic
decision point voltages of the data and clock signals can differ, which can corrupt data if slower transition times
are used.
Table A-9 QSPI Timing
(VDD = 5.0 Vdc ± 10%, VSS = 0 Vdc, TA = TL to TH, 200 pF load on all QSPI pins)
Num Function Symbol Min Max Unit
Operating Frequency
Master
Slave
fop DC
DC
1/4
1/4
System Clock Frequency
System Clock Frequency
1 Cycle Time
Master
Slave
tqcyc 4
4
510
—
tcyc
tcyc
2 Enable Lead Time
Master
Slave
tlead 2
2
128
—
tcyc
tcyc
3 Enable Lag Time
Master
Slave
tlag —
2
1/2
—
SCK
tcyc
4 Clock (SCK) High or Low Time
Master
Slave2
tsw 2 tcyc – 60
2 tcyc – n
255 tcyc
—
ns
ns
5 Sequential Transfer Delay
Master
Slave (Does Not Require Deselect)
ttd 17
13
8192
—
tcyc
tcyc
6 Data Setup Time (Inputs)
Master
Slave
tsu 30
20
—
—
ns
ns
7 Data Hold Time (Inputs)
Master
Slave
thi 0
20
—
—
ns
ns
8 Slave Access Time ta—1 t
cyc
9 Slave MISO Disable Time tdis —2 t
cyc
10 Data Valid (after SCK Edge)
Master
Slave
tv—
—
50
50
ns
ns
11 Data Hold Time (Outputs)
Master
Slave
tho 0
0
—
—
ns
ns
12 Rise Time
Input3
Output tri
tro
—
—
2
30 µs
ns
13 Fall Time
Input3
Output tfi
tfo
—
—
2
30 µs
ns
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MC68332 ELECTRICAL CHARACTERISTICS
USER’S MANUAL A-27
Figure A-16 QSPI Timing — Master, CPHA = 0
Figure A-17 QSPI Timing — Master, CPHA = 1
68300 QSPI T MAST CPHA0
DATA LSB IN MSB IN
MSB OUT
MSB IN
MSB OUT DATA LSB OUT PORT DATA
PCS0–PCS3
OUTPUT
PD
MISO
INPUT
MOSI
OUTPUT
SCK
CPOL=0
OUTPUT
SCK
CPOL=1
OUTPUT 64
13 12 5
7
11 10
13 12
2
13
12
3
41
68300 QSPI T MAST CPHA1
DATA LSB IN MSB IN
MSB OUT
MSB IN
MSB OUT DATA LSB OUT PORT DATA
PCS0–PCS3
OUTPUT
MISO
INPUT
MOSI
OUTPUT
SCK
CPOL=0
OUTPUT
SCK
CPOL=1
OUTPUT
4
13 12 5
11 10
13 12
2
13
12
3
41
1
7
6
PORT DATA
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ELECTRICAL CHARACTERISTICS MC68332
A-28 USER’S MANUAL
Figure A-18 QSPI Timing — Slave, CPHA = 0
Figure A-19 QSPI Timing — Slave, CPHA = 1
68300 QSPI T SLV CPHA0
DATA LSB OUT MSB OUT
MSB IN
MSB OUT
MSB IN DATA LSB IN
SS
INPUT
MISO
OUTPUT
MOSI
INPUT
SCK
CPOL=0
INPUT
SCK
CPOL=1
INPUT
11
13 12 5
612
2
13
12
3
41
9
810
4
11
713
PD
68300 QSPI T SLV CPHA1
DATA SLAVEMSB
MSB IN DATA LSB IN
SS
INPUT
MISO
OUTPUT
MOSI
INPUT
SCK
CPOL=0
INPUT
SCK
CPOL=1
INPUT
12
5
612
3
98 10
4
7
PD
1 13
2
10 13 11
412
PD LSB OUTOUT
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MC68332 ELECTRICAL CHARACTERISTICS
USER’S MANUAL A-29
Figure A-20 TPU Timing Diagram
NOTES:
1.AC timing is shown with respect to 20% VDD and 70% VDD levels.
2.Timing not valid for external T2CLK input.
3.Maximum load capacitance for CLKOUT pin is 90 pF.
4.Maximum load capacitance for TPU output pins is 100 pF.
Table A-10 16.78 MHz Time Processor Unit Timing
(VDD and VDDSYN = 5.0 Vdc ±10%, VSS = 0 Vdc, TA = TL to TH, 32.768 kHz reference)
Num Rating Symbol Min Max Unit
1 CLKOUT High to TPU Output Channel Valid tCHTOV 223ns
2 CLKOUT High to TPU Output Channel Hold tCHTOH 020ns
3 TPU Input Channel Pulse Width tTIPW 4—t
cyc
Table A-11 20.97 MHz Time Processor Unit Timing
(VDD and VDDSYN = 5.0 Vdc ±10%, VSS = 0 Vdc, TA = TL to TH, 32.768 kHz reference)
Num Rating Symbol Min Max Unit
1 CLKOUT High to TPU Output Channel Valid tCHTOV 218ns
2 CLKOUT High to TPU Output Channel Hold tCHTOH 015ns
3 TPU Input Channel Pulse Width tTIPW 4—t
cyc
TPU I/O TIM
CLKOUT
TPU OUTPUT
TPU INPUT
21
3
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ELECTRICAL CHARACTERISTICS MC68332
A-30 USER’S MANUAL
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MC68332 MECHANICAL DATA AND ORDERING INFORMATION
USER’S MANUAL B-1
APPENDIX B MECHANICAL DATA AND ORDERING INFORMATION
This section contains detailed information to be used as a guide when ordering.
The MC68332 is available in either a 132-pin or 144-pin plastic surface mount pack-
age. This appendix provides package pin assignment drawings, dimensional draw-
ings, and ordering information.
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MECHANICAL DATA AND ORDERING INFORMATION MC68332
B-2 USER’S MANUAL
Figure B-1 132-Pin Plastic Surface Mount Package Pin Assignments
332 132-PIN QF
P
MC68332
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
116
115
114
113
112
111
110
109
108
107
106
105
104
103
102
101
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
84
DATA9
DATA10
DATA11
DATA12
DATA13
DATA14
DATA15
ADDR0
ADDR1
ADDR2
ADDR3
ADDR4
ADDR5
ADDR6
ADDR7
ADDR8
ADDR9
ADDR10
ADDR11
ADDR12
ADDR13
ADDR14
ADDR15
ADDR16
ADDR17
ADDR18
P
QS0/MISO
P
QS1/MOSI
PQS2/SCK
3/PCS0/SS
P
QS4/PCS1
P
QS5/PCS2
P
QS6/PCS3
DATA0
DATA1
DATA2
DATA3
DATA4
DATA5
DATA6
DATA7
DATA8
VDD
VSS
VDD
PE1/DS
A
PE0/DS
A
PE2/AV
E
PE3/RM
C
PE5/DS
CSBOO
T
BGACK/
C
BG/CS1
BR/CS0
VSTBY
51 17
117
16
15
14
13
12
11
10
9
8
7
6
5
4
3
131
130
129
128
127
126
125
124
123
122
121
120
119
118
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
PQS7/TXD
RXD
IPIPE/DSO
FREEZE/QUOT
XTAL
EXTAL
XFC
CLKOUT
PF0/MODCLK
PE7/SIZ1
PE6/SIZ0
TPUCH0
TPUCH1
TPUCH2
TPUCH3
TPUCH4
TPUCH5
TPUCH6
TPUCH7
TPUCH8
TPUCH9
TPUCH10
TPUCH11
TPUCH13
TPUCH14
TPUCH15
T2CLK
TPUCH12
VSS
VDD
VSS
PC0/FC0/CS3
PC1/FC1/CS4
PC2/FC2/CS5
PC3/ADDR19/CS6
PC4/ADDR20/CS7
PC5/ADDR21/CS8
PC6/ADDR22/CS9
ADDR23/CS10
AS
R/W
PF1/IRQ1
PF2/IRQ2
PF3/IRQ3
PF4/IRQ4
PF5/IRQ5
PF6/IRQ6
PF7/IRQ7
BERR
HALT
RESET
TSC
BKPT/DSCLK
IFETCH/DSI
2
1
132
VDDSYN
VSS
VSS
VDD
VSS
VDD
VSS
VDD
VSS
VSS
VDD
VDD
VSS
VDD
VDD
VSS
VSS
VDD
VSS
VSS
VSS
VDD
VDD
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MC68332 MECHANICAL DATA AND ORDERING INFORMATION
USER’S MANUAL B-3
Figure B-2 144-Pin Plastic Surface Mount Package Pin Assignments
332 144-PIN QFP
VSS
NC
FC0/CS3
FC1/CS4
FC2/CS5
ADDR19/CS6
ADDR20/CS7
ADDR21/CS8
ADDR22/CS9
ADDR23/CS10
VDD
T2CLK
TPUCH15
TPUCH14
TPUCH13
TPUCH12
NC
TPUCH11
TPUCH10
TPUCH9
TPUCH8
VDDE
VSSE
TPUCH7
TPUCH6
TPUCH5
TPUCH4
MC68332
NC
PE4/AS
PE6/SIZ0
PE7/SIZ1
R/W
PF0/MODCLK
PF1/IRQ1
PF2/IRQ2
PF3/IRQ3
PF4/IRQ4
PF5/IRQ5
PF6/IRQ6
PF7/IRQ7
BERR
HALT
RESET
CLKOUT
NC
XFC
EXTAL
VDD
XTAL
FREEZE/QUOT
TSC
BKPT/DSCLK
IFETCH/DSI
IPIPE/DSO
RXD
PQS7/TXD
VSS
NC
TPUCH3
TPUCH2
TPUCH1
TPUCH0
NC
2
1
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
107
108
106
105
104
103
102
101
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
84
83
82
81
80
79
78
77
76
75
74
73
31
32
33
34
35
36
BGACK/CS2
BG/CS1
BR/CS0
CSBOOT
DATA0
DATA1
DATA2
DATA3
DATA4
DATA5
DATA6
DATA7
NC
DATA8
NC
DATA9
DATA10
NC
DATA11
VSS
DATA12
DATA13
DATA14
DATA15
ADDR0
PE0/DSACK0
PE1/DSACK1
PE2/AVEC
PE3/RMC
PE5/DS
VDD
VSTBY
ADDR1
ADDR2
ADDR3
ADDR4
ADDR5
ADDR6
ADDR7
ADDR8
VDD
VSS
ADDR9
ADDR10
ADDR11
ADDR12
NC
NC
ADDR13
ADDR14
ADDR15
NC
ADDR16
ADDR17
ADDR18
PQS0/MISO
PQS1/MOSI
PQS2/SCK
PQS3/PCS0/SS
PQS4/PCS1
PQS5/PCS2
PQS6/PCS3
143
144
142
141
140
139
138
137
136
135
134
133
132
131
130
129
128
127
126
125
124
123
122
121
120
119
118
117
116
115
114
113
112
111
110
109
37
65
68
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
66
67
69
70
71
72
VSS
VDD
VSS
VDD
VSS
VDD
VDD
VSS
VSS
VDD
VSS
VSS
VDD
VDD
VSS
VDD
VSS
VSS
VDD
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MECHANICAL DATA AND ORDERING INFORMATION MC68332
B-4 USER’S MANUAL
Case outlines number 831A-01 issue A, 863C-01 issue O, and 918-02 issue A are
available on the web at
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MC68332 MECHANICAL DATA AND ORDERING INFORMATION
USER’S MANUAL B-5
Table B-1 MCU Ordering Information
Package Type TPU Type Temperature Frequency
(MHz) Package
Order
Quantity
Order Number
132-pin PQFP Motion Control –40 to +85 °C 16 MHz 2 pc tray SPAKMC332GCFC16
36 pc tray MC68332GCFC16*
20 MHz 2 pc tray SPAKMC332GCFC20
36 pc tray MC68332GCFC20*
–40 to +105 °C 16 MHz 2 pc tray SPAKMC332GVFC16
36 pc tray MC68332GVFC16*
20 MHz 2 pc tray SPAKMC332GVFC20
36 pc tray MC68332GVFC20*
–40 to +125 °C 16 MHz 2 pc tray SPAKMC332GMFC16
36 pc tray MC68332GMFC16*
20 MHz 2 pc tray SPAKMC332GMFC20
36 pc tray MC68332GMFC20*
Std w/enhanced
PPWA
–40 to +85 °C 16 MHz 2 pc tray SPAKMC332ACFC16
36 pc tray MC68332ACFC16*
20 MHz 2 pc tray SPAKMC332ACFC20
36 pc tray MC68332ACFC20*
–40 to +105 °C 16 MHz 2 pc tray SPAKMC332AVFC16
36 pc tray MC68332AVFC16*
20 MHz 2 pc tray SPAKMC332AVFC20
36 pc tray MC68332AVFC20*
–40 to +125 °C 16 MHz 2 pc tray SPAKMC332AMFC16
36 pc tray MC68332AMFC16*
20 MHz 2 pc tray SPAKMC332AMFC20
36 pc tray MC68332AMFC20*
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MECHANICAL DATA AND ORDERING INFORMATION MC68332
B-6 USER’S MANUAL
144-pin QFP Motion Control –40 to +85 °C 16 MHz 2 pc tray SPAKMC332GCFV16
44 pc tray MC68332GCFV16*
20 MHz 2 pc tray SPAKMC332GCFV20
44 pc tray MC68332GCFV20*
–40 to +105 °C 16 MHz 2 pc tray SPAKMC332GVFV16
44 pc tray MC68332GVFV16*
20 MHz 2 pc tray SPAKMC332GVFV20
44 pc tray MC68332GVFV20*
–40 to +125 °C 16 MHz 2 pc tray SPAKMC332GMFV16
44 pc tray MC68332GMFV16*
20 MHz 2 pc tray SPAKMC332GMFV20
44 pc tray MC68332GMFV20*
Std w/enhanced
PPWA
–40 to +85 °C 16 MHz 2 pc tray SPAKMC332ACFV16
44 pc tray MC68332ACFV16*
20 MHz 2 pc tray SPAKMC332ACFV20
44 pc tray MC68332ACFV20*
–40 to +105 °C 16 MHz 2 pc tray SPAKMC332AVFV16
44 pc tray MC68332AVFV16*
20 MHz 2 pc tray SPAKMC332AVFV20
44 pc tray MC68332AVFV20*
–40 to +125 °C 16 MHz 2 pc tray SPAKMC332AMFV16
44 pc tray MC68332AMFV16*
20 MHz 2 pc tray SPAKMC332AMFV20
44 pc tray MC68332AMFV20*
Table B-1 MCU Ordering Information (Continued)
Package Type TPU Type Temperature Frequency
(MHz) Package
Order
Quantity
Order Number
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MC68332 MECHANICAL DATA AND ORDERING INFORMATION
USER’S MANUAL B-7
*Quantity orders are designated by a part number suffix (refer to Table B-2). Contact your Freescale representative
for more information.
144-pin TQFP Motion Control –40 to +85 °C 16 MHz 2 pc tray SPAKMC332GCPV16
60 pc tray MC68332GCPV16*
20 MHz 2 pc tray SPAKMC332GCPV20
60 pc tray MC68332GCPV20*
–40 to +105 °C 16 MHz 2 pc tray SPAKMC332GVPV16
60 pc tray MC68332GVPV16*
20 MHz 2 pc tray SPAKMC332GVPV20
60 pc tray MC68332GVPV20*
–40 to +125 °C 16 MHz 2 pc tray SPAKMC332GMPV16
60 pc tray MC68332GMPV16*
20 MHz 2 pc tray SPAKMC332GMPV20
60 pc tray MC68332GMPV20*
Std w/enhanced
PPWA
–40 to +85 °C 16 MHz 2 pc tray SPAKMC332ACPV16
60 pc tray MC68332ACPV16*
20 MHz 2 pc tray SPAKMC332ACPV20
60 pc tray MC68332ACPV20*
–40 to +105 °C 16 MHz 2 pc tray SPAKMC332AVPV16
60 pc tray MC68332AVPV16*
20 MHz 2 pc tray SPAKMC332AVPV20
60 pc tray MC68332AVPV20*
–40 to +125 °C 16 MHz 2 pc tray SPAKMC332AMPV16
60 pc tray MC68332AMPV16*
20 MHz 2 pc tray SPAKMC332AMPV20
60 pc tray MC68332AMPV20*
Table B-2 Quantity Order Suffix
FC FV PV
36 44 60
180 220 300
360 440 600
Table B-1 MCU Ordering Information (Continued)
Package Type TPU Type Temperature Frequency
(MHz) Package
Order
Quantity
Order Number
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MECHANICAL DATA AND ORDERING INFORMATION MC68332
B-8 USER’S MANUAL
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MC68332 DEVELOPMENT SUPPORT
USER’S MANUAL C-1
APPENDIX C DEVELOPMENT SUPPORT
This section serves as a brief reference to Freescale development tools for the
MC68332 microcontroller. Information provided is complete as of the time of publica-
tion, but new systems and software are continually being developed. In addition, there
is a growing number of third-party tools available. The Freescale
MCU Tool Box
(MCUTLBX/D Rev. C) provides an up-to-date list of development tools. Contact your
Freescale representative for further information.
C.1 M68MMDS1632 Modular Development System
The M68MMDS1632 Freescale Modular Development System (MMDS) is a develop-
ment tool for evaluating M68HC16 and M68300 MCU-based systems. The
MMDS1632 is an emulator, bus state analyzer, and control station for debugging hard-
ware and software. A separately purchased active probe completes MMDS function-
ality with regard to a particular MCU or MCU family. The many active probes available
let your MMDS emulate a variety of different MCUs. Contact your Freescale sales rep-
resentative, who will assist you in selecting and configuring the modular system that
fits your needs. A full-featured development system, the MMDS provides both in-cir-
cuit emulation and bus analysis capabilities, including:
• Real-time in-circuit emulation at maximum speed of 20 MHz (can be upgraded to
33 MHz)
• Built-in emulation memory
— 1 Mbyte main emulation memory (fast termination, 2 bus cycle)
— 4 Kbytes dual-port emulation memory
• Real-time bus analysis
— Instruction disassembly
— State-machine-controlled triggering
• Four hardware breakpoints, bitwise masking
• Analog/digital emulation
• Synchronized signal output
• Built-in AC power supply, 85–264 V, 50–60 Hz, FCC and EC EMI compliant
• RS-232 connection to host capable of communicating at 1200, 2400, 4800, 9600,
19200, 38400, or 57600 baud
Table C-1 MC68332 Development Tools
Microcontroller
Part Number Modular
Development System Modular
Evaluation System
MC68332 M68MMDS1632 M68MEVB1632
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DEVELOPMENT SUPPORT MC68332
C-2 USER’S MANUAL
C.2 M68MEVB1632 Modular Evaluation Board
The M68MEVB1632 Modular Evaluation Board (MEVB) is a development tool for eval-
uating M68HC16 and M68300 MCU-based systems. The MEVB consists of the
M68HC16MPFB modular platform board, an MCU personality board (MPB), an in-cir-
cuit debugger printed circuit board (ICD16 or ICD32), and development software.
MEVB features include:
• An economical means of evaluating target systems incorporating M68HC16 and
M68300 HCMOS MCU devices.
• Expansion memory sockets for installing RAM, EPROM, or EEPROM.
— Data RAM: 32K x 16, 128K x 16, or 512K x 16
— EPROM/EEPROM: 32K x 16, 64K x 16, 128K x 16, 256K x 16, or 512K x 16
— Fast RAM: 32K x 16 or 128K x 16
• Background-mode operation, for detailed operation from a personal computer
platform without an on-board monitor.
• Integrated assembly/editing/evaluation/programming environment for easy de-
velopment.
• As many as seven software breakpoints.
• Re-usable ICD hardware for your target application debug or control.
• Two RS-232C terminal input/output (I/O) ports for user evaluation of the serial
communication interface.
• Logic analyzer pod connectors.
• Port replacement unit (PRU) to rebuild I/O ports lost to address/data/control.
• On-board VPP (+12 Vdc) generation for MCU and flash EEPROM programming.
• On-board wire-wrap area.
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MC68332 REGISTER SUMMARY
USER’S MANUAL D-1
APPENDIX D REGISTER SUMMARY
This appendix contains MCU address maps, register diagrams, and bit/field defini-
tions. More detailed information about register function is provided in the appropriate
sections of the manual.
Except for central processing unit resources, information is presented in the intermod-
ule bus address order shown in Table D-1.
Control registers for all the modules in the microcontroller are mapped into a 4-Kbyte
block. The state of the module mapping (MM) bit in the SIM configuration register
(SIMCR) determines where the control registers block is located in the system mem-
ory map. When MM = 0, register addresses range from $7FF000 to $7FFFFF; when
MM = 1, register addresses range from $FFF000 to $FFFFFF.
In the module memory maps in this appendix, the “Access” column specifies which
registers are accessible at the supervisor privilege level only and which registers can
be assigned to either the supervisor or user privilege level.
D.1 Central Processing Unit
CPU32 registers are not part of the module address map. The following diagram is a
functional representation of CPU resources.
Table D-1 Module Address Map
Module Size
(Bytes) Base
Address
SIM 128 $YFFA00
TPURAM CNTL 64 $YFFB00
QSM 512 $YFFC00
TPU 512 $YFFE00
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REGISTER SUMMARY MC68332
D-2 USER’S MANUAL
D.1.1 CPU32 Register Model
Figure D-1 User Programming Model
Figure D-2 Supervisor Programming Model Supplement
3116 158 70
D0
D1
D2
D3 DATA REGISTERS
D4
D5
D6
D7
3116 150
A0
A1
A2
A3 ADDRESS REGISTERS
A4
A5
A6
3116 150
A7 (USP) USER STACK POINTER
310
PC PROGRAM COUNTER
70
CCR CONDITION CODE REGISTER
3116 150
A7 (SSP) SUPERVISOR STACK
POINTER
158 70
(CCR) SR STATUS REGISTER
310
VBR VECTOR BASE REGISTER
20
SFC ALTERNATE FUNCTION
DFC CODE REGISTERS
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MC68332 REGISTER SUMMARY
USER’S MANUAL D-3
D.1.2 SR — Status Register
The status register (SR) contains condition codes, an interrupt priority mask, and three
control bits. The condition codes are contained in the condition code register (CCR),
the lower byte of the SR. (The lower and upper bytes of the status register are also
referred to as the user and system bytes, respectively.) At the user privilege level, only
the CCR is available. At the supervisor level, software can access the full status reg-
ister.
T[1:0] — Trace Enable
00 = No tracing
01 = Trace on change of flow
10 = Trace on instruction execution
11 = Undefined; reserved
S — Supervisor/User State
0 = CPU operates at user privilege level
1 = CPU operates at supervisor privilege level
IP[2:0] — Interrupt Priority Mask
The priority value in this field (0 to 7) is used to mask interrupts.
X — Extend Flag
Used in multiple-precision arithmetic operations. In many instructions it is set to the
same value as the C bit.
N — Negative Flag
Set when the MSB of a result register is set.
Z — Zero Flag
Set when all bits of a result register are zero.
V — Overflow Flag
Set when two's complement overflow occurs as the result of an operation.
C — Carry Flag
Set when a carry or borrow occurs during an arithmetic operation. Also used during
shift and rotate instructions to facilitate multiple word operations.
D.2 System Integration Module
Table D-2 is the SIM address map. The column labeled “Access” indicates the privi-
lege level at which the CPU must be operating to access the register. A designation of
“S” indicates that supervisor access is required. A designation of “S/U” indicates that
the register can be programmed to the desired privilege level.
T[1:0] S 0 0 IP 0 0 0 X N Z V C
RESET:
0 0 1 0 0 1 1 1 0 0 0 U U U U U
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REGISTER SUMMARY MC68332
D-4 USER’S MANUAL
Table D-2 SIM Address Map
Access Address 15 8 7 0
S $YFFA00 SIM CONFIGURATION (SIMCR)
S $YFFA02 FACTORY TEST (SIMTR)
S $YFFA04 CLOCK SYNTHESIZER CONTROL (SYNCR)
S $YFFA06 NOT USED RESET STATUS REGISTER (RSR)
S $YFFA08 MODULE TEST E (SIMTRE)
S $YFFA0A NOT USED NOT USED
S $YFFA0C NOT USED NOT USED
S $YFFA0E NOT USED NOT USED
S/U $YFFA10 NOT USED PORT E DATA (PORTE0)
S/U $YFFA12 NOT USED PORT E DATA (PORTE1)
S/U $YFFA14 NOT USED PORT E DATA DIRECTION (DDRE)
S $YFFA16 NOT USED PORT E PIN ASSIGNMENT (PEPAR)
S/U $YFFA18 NOT USED PORT F DATA (PORTF0)
S/U $YFFA1A NOT USED PORT F DATA (PORTF1)
S/U $YFFA1C NOT USED PORT F DATA DIRECTION (DDRF)
S $YFFA1E NOT USED PORT F PIN ASSIGNMENT (PFPAR)
S $YFFA20 NOT USED SYSTEM PROTECTION CONTROL
(SYPCR)
S $YFFA22 PERIODIC INTERRUPT CONTROL (PICR)
S $YFFA24 PERIODIC INTERRUPT TIMING (PITR)
S $YFFA26 NOT USED SOFTWARE SERVICE (SWSR)
S $YFFA28 NOT USED NOT USED
S $YFFA2A NOT USED NOT USED
S $YFFA2C NOT USED NOT USED
S $YFFA2E NOT USED NOT USED
S $YFFA30 TEST MODULE MASTER SHIFT A (TSTMSRA)
S $YFFA32 TEST MODULE MASTER SHIFT B (TSTMSRB)
S $YFFA34 TEST MODULE SHIFT COUNT (TSTSC)
S $YFFA36 TEST MODULE REPETITION COUNTER (TSTRC)
S $YFFA38 TEST MODULE CONTROL (CREG)
S/U $YFFA3A TEST MODULE DISTRIBUTED REGISTER (DREG)
$YFFA3C NOT USED NOT USED
$YFFA3E NOT USED NOT USED
S/U $YFFA40 NOT USED PORT C DATA (PORTC)
$YFFA42 NOT USED NOT USED
S $YFFA44 CHIP-SELECT PIN ASSIGNMENT (CSPAR0)
S $YFFA46 CHIP-SELECT PIN ASSIGNMENT (CSPAR1)
S $YFFA48 CHIP-SELECT BASE BOOT (CSBARBT)
S $YFFA4A CHIP-SELECT OPTION BOOT (CSORBT)
S $YFFA4C CHIP-SELECT BASE 0 (CSBAR0)
S $YFFA4E CHIP-SELECT OPTION 0 (CSOR0)
S $YFFA50 CHIP-SELECT BASE 1 (CSBAR1)
S $YFFA52 CHIP-SELECT OPTION 1 (CSOR1)
S $YFFA54 CHIP-SELECT BASE 2 (CSBAR2)
S $YFFA56 CHIP-SELECT OPTION 2 (CSOR2)
S $YFFA58 CHIP-SELECT BASE 3 (CSBAR3)
S $YFFA5A CHIP-SELECT OPTION 3 (CSOR3)
$YFFA5C CHIP-SELECT BASE 4 (CSBAR4)
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MC68332 REGISTER SUMMARY
USER’S MANUAL D-5
Y = M111, where M is the logic state of the module mapping (MM) bit in the SIMCR.
D.2.1 SIMCR — Module Configuration Register $YFFA00
SIMCR controls system configuration. SIMCR can be read or written at any time, ex-
cept for the module mapping (MM) bit, which can only be written once.
EXOFF — External Clock Off
0 = The CLKOUT pin is driven from an internal clock source.
1 = The CLKOUT pin is placed in a high-impedance state.
FRZSW — Freeze Software Enable
0 = When FREEZE is asserted, the software watchdog and periodic interrupt timer
counters continue to run.
1 = When FREEZE is asserted, the software watchdog and periodic interrupt timer
counters are disabled, preventing interrupts during software debug.
FRZBM — Freeze Bus Monitor Enable
0 = When FREEZE is asserted, the bus monitor continues to operate.
1 = When FREEZE is asserted, the bus monitor is disabled.
SLVEN — Factory Test Mode Enabled
0 = IMB is not available to an external master.
1 = An external bus master has direct access to the IMB.
SHEN[1:0] — Show Cycle Enable
This field determines what the EBI does with the external bus during internal transfer
operations.
S $YFFA5E CHIP-SELECT OPTION 4 (CSOR4)
S $YFFA60 CHIP-SELECT BASE 5 (CSBAR5)
S $YFFA62 CHIP-SELECT OPTION 5 (CSOR5)
S $YFFA64 CHIP-SELECT BASE 6 (CSBAR6)
S $YFFA66 CHIP-SELECT OPTION 6 (CSOR6)
S $YFFA68 CHIP-SELECT BASE 7 (CSBAR7)
S $YFFA6A CHIP-SELECT OPTION 7 (CSOR7)
S $YFFA6C CHIP-SELECT BASE 8 (CSBAR8)
S $YFFA6E CHIP-SELECT OPTION 8 (CSOR8)
S $YFFA70 CHIP-SELECT BASE 9 (CSBAR9)
S $YFFA72 CHIP-SELECT OPTION 9 (CSOR9)
S $YFFA74 CHIP-SELECT BASE 10 (CSBAR10)
S $YFFA76 CHIP-SELECT OPTION 10 (CSOR10)
$YFFA78 NOT USED NOT USED
$YFFA7A NOT USED NOT USED
$YFFA7C NOT USED NOT USED
$YFFA7E NOT USED NOT USED
15 14 13 12 11 10 9 8 7 6 5 4 3 0
EXOFF FRZSW FRZBM 0 SLVEN 0 SHEN SUPV MM 0 0 IARB
RESET:
0 0 0 0 DATA
11 0 0 0 1 1 0 0 1 1 1 1
Table D-2 SIM Address Map
Access Address 15 8 7 0
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REGISTER SUMMARY MC68332
D-6 USER’S MANUAL
SUPV — Supervisor/Unrestricted Data Space
The SUPV bit places the SIM global registers in either supervisor or user data space.
0 = Registers with access controlled by the SUPV bit are accessible from either the
user or supervisor privilege level.
1 = Registers with access controlled by the SUPV bit are restricted to supervisor
access only.
MM — Module Mapping
0 = Internal modules are addressed from $7FF000 – $7FFFFF.
1 = Internal modules are addressed from $FFF000 – $FFFFFF.
IARB[3:0] — Interrupt Arbitration Field
Determines SIM interrupt arbitration priority. The reset value is $F (highest priority), to
prevent SIM interrupts from being discarded during initialization.
D.2.2 SIMTR — System Integration Test Register $YFFA02
SIMTR is used for factory test only.
D.2.3 SYNCR — Clock Synthesizer Control Register $YFFA04
SYNCR determines system clock operating frequency and mode of operation. Clock
frequency is determined by SYNCR bit settings as follows:
W — Frequency Control (VCO)
0 = Base VCO frequency
1 = VCO frequency multiplied by four
X — Frequency Control Bit (Prescale)
0 = VCO frequency divided by four (base system clock frequency)
1 = VCO frequency divided by two (system clock frequency doubles)
Y[5:0] — Frequency Control (Counter)
The Y field is the initial value for the modulus 64 down counter in the synthesizer feed-
back loop. Values range from 0 to 63.
EDIV — ECLK Divide Rate
0 = ECLK is system clock divided by 8
1 = ECLK is system clock divided by 16
SLIMP — Limp Mode
0 = External crystal is VCO reference
1 = Loss of crystal reference
SLOCK — Synthesizer Lock
0 = VCO is enabled, but has not locked.
1 = VCO has locked on the desired frequency or system clock is external.
15 14 13 8 7 6 5 4 3 2 1 0
W X Y EDIV 0 0 SLIMP SLOCK RSTEN STSIM STEXT
RESET:
0 0 1 1 1 1 1 1 0 0 0 U U 0 0 0
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MC68332 REGISTER SUMMARY
USER’S MANUAL D-7
RSTEN — Reset Enable
0 = Loss of reference causes the MCU to operate in limp mode.
1 = Loss of reference causes system reset.
STSIM — Stop Mode System Integration Clock
0 = SIM clock driven by an external source and VCO off during low-power stop.
1 = SIM clock driven by VCO during low-power stop.
STEXT — Stop Mode External Clock
0 = CLKOUT held low during low-power stop.
1 = CLKOUT driven from SIM clock during low-power stop.
D.2.4 RSR — Reset Status Register $YFFA07
RSR contains a status bit for each reset source in the MCU. RSR is updated when the
MCU comes out of reset. A set bit indicates what type of reset occurred. If multiple
sources assert reset signals at the same time, more than one bit in RSR may be set.
This register can be read at any time; a write has no effect.
EXT — External Reset
Reset caused by an external signal.
POW — Power-Up Reset
Reset caused by the power-up reset circuit.
SW — Software Watchdog Reset
Reset caused by the software watchdog circuit.
HLT — Halt Monitor Reset
Reset caused by the halt monitor.
LOC — Loss of Clock Reset
Reset caused by loss of clock frequency reference.
SYS — System Reset
Reset caused by a RESET instruction.
TST — Test Submodule Reset
Reset caused by the test submodule. Used during system test only.
D.2.5 SIMTRE — System Integration Test Register (ECLK) $YFFA08
Register is used for factory test only.
15 8 7 6 5 4 3 2 1 0
NOT USED EXT POW SW HLT 0 LOC SYS TST
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REGISTER SUMMARY MC68332
D-8 USER’S MANUAL
D.2.6 PORTE0/PORTE1 — Port E Data Register $YFFA11, $YFFA13
PORTE is an internal data latch that can be accessed at two locations. PORTE can be
read or written at any time. If a pin in I/O port E is configured as an output, the corre-
sponding bit value is driven out on the pin. When a pin is configured for output, a read
of PORTE returns the latched bit value; when a pin is configured for input, a read re-
turns the pin logic level.
D.2.7 DDRE — Port E Data Direction Register $YFFA15
Bits in this register control the direction of the port E pin drivers when pins are config-
ured for I/O. Setting a bit configures the corresponding pin as an output; clearing a bit
configures the corresponding pin as an input. This register can be read or written at
any time.
D.2.8 PEPAR — Port E Pin Assignment Register $YFFA17
Bits in this register determine the function of port E pins. Setting a bit assigns the cor-
responding pin to a bus control signal; clearing a bit assigns the pin to I/O port E.
15 8 7 6 5 4 3 2 1 0
NOT USED PE7 PE6 PE5 PE4 PE3 PE2 PE1 PE0
RESET:
U U U U U U U U
15 8 7 6 5 4 3 2 1 0
NOT USED DDE7 DDE6 DDE5 DDE4 DDE3 DDE2 DDE1 DDE0
RESET:
0 0 0 0 0 0 0 0
15 8 7 6 5 4 3 2 1 0
NOT USED PEPA7 PEPA6 PEPA5 PEPA4 PEPA3 PEPA2 PEPA1 PEPA0
RESET:
DATA8 DATA8 DATA8 DATA8 DATA8 DATA8 DATA8 DATA8
Port E Pin Assignments
PEPAR Bit Port E Signal Bus Control Signal
PEPA7 PE7 SIZ1
PEPA6 PE6 SIZ0
PEPA5 PE5 AS
PEPA4 PE4 DS
PEPA3 PE3 RMC
PEPA2 PE2 AVEC
PEPA1 PE1 DSACK1
PEPA0 PE0 DSACK0
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MC68332 REGISTER SUMMARY
USER’S MANUAL D-9
D.2.9 PORTF0/PORTF1 — Port F Data Register $YFFA19, $YFFA1B
PORTF is an internal data latch that can be accessed at two locations. It can be read
or written at any time. If a pin in I/O port F is configured as an output, the corresponding
bit value is driven out on the pin. When a pin is configured for output, a read of PORTF
returns the latched bit value; when a pin is configured for input, a read returns the pin
logic level.
D.2.10 DDRF — Port F Data Direction Register $YFFA1D
Bits in this register control the direction of the port F pin drivers when pins are config-
ured for I/O. Setting a bit configures the corresponding pin as an output; clearing a bit
configures the corresponding pin as an input. This register can be read or written at
any time.
D.2.11 PFPAR — Port F Pin Assignment Register $YFFA1F
Bits in this register determine the function of port F pins. Setting a bit assigns the cor-
responding pin to a control signal; clearing a bit assigns the pin to port F.
15 8 7 6 5 4 3 2 1 0
NOT USED PF7 PF6 PF5 PF4 PF3 PF2 PF1 PF0
RESET:
U U U U U U U U
15 8 7 6 5 4 3 2 1 0
NOT USED DDF7 DDF6 DDF5 DDF4 DDF3 DDF2 DDF1 DDF0
RESET:
0 0 0 0 0 0 0 0
15 8 7 6 5 4 3 2 1 0
NOT USED PFPA7 PFPA6 PFPA5 PFPA4 PFPA3 PFPA2 PFPA1 PFPA0
RESET:
DATA9 DATA9 DATA9 DATA9 DATA9 DATA9 DATA9 DATA9
Port F Pin Assignments
PFPAR Field Port F Signal Control Signal
PFPA7 PF7 IRQ7
PFPA6 PF6 IRQ6
PFPA5 PF5 IRQ5
PFPA4 PF4 IRQ4
PFPA3 PF3 IRQ3
PFPA2 PF2 IRQ2
PFPA1 PF1 IRQ1
PFPA0 PF0 MODCLK
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REGISTER SUMMARY MC68332
D-10 USER’S MANUAL
D.2.12 SYPCR — System Protection Control Register $YFFA21
SYPCR controls system monitor functions, software watchdog clock prescaling, and
bus monitor timing. This register can be written once following power-on or reset.
SWE — Software Watchdog Enable
0 = Software watchdog disabled
1 = Software watchdog enabled
SWP — Software Watchdog Prescale
0 = Software watchdog clock not prescaled
1 = Software watchdog clock prescaled by 512
SWT[1:0] — Software Watchdog Timing
This field selects software watchdog time-out period.
HME — Halt Monitor Enable
0 = Disable halt monitor function
1 = Enable halt monitor function
BME — Bus Monitor External Enable
0 = Disable bus monitor function for an internal to external bus cycle.
1 = Enable bus monitor function for an internal to external bus cycle.
BMT[1:0] — Bus Monitor Timing
This field selects bus monitor time-out period.
15 8 7 6 5 4 3 2 1 0
NOT USED SWE SWP SWT HME BME BMT
RESET:
1 MODCLK 0 0 0 0 0 0
Software Watchdog Ratio
SWP SWT Ratio
000
2
9
001
2
11
010
2
13
011
2
15
100
2
18
101
2
20
110
2
22
111
2
24
Bus Monitor Period
BMT Bus Monitor Time-out Period
00 64 System Clocks
01 32 System Clocks
10 16 System Clocks
11 8 System Clocks
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MC68332 REGISTER SUMMARY
USER’S MANUAL D-11
D.2.13 PICR — Periodic Interrupt Control Register $YFFA22
Contains information concerning periodic interrupt priority and vectoring. PICR[10:0]
can be read or written at any time. PICR[15:11] are unimplemented and always return
zero.
PIRQL[2:0] — Periodic Interrupt Request Level
This field determines the priority of periodic interrupt requests.
PIV[7:0] — Periodic Interrupt Vector
The bits of this field contain the interrupt vector number supplied by the SIM when the
CPU acknowledges an interrupt request.
D.2.14 PITR — Periodic Interrupt Timer Register $YFFA24
Contains the count value for the periodic timer. This register can be read or written at
any time.
PTP — Periodic Timer Prescaler Control
0 = Periodic timer clock not prescaled
1 = Periodic timer clock prescaled by a value of 512
PITM[7:0] — Periodic Interrupt Timing Modulus
This is the 8-bit timing modulus used to determine periodic interrupt rate. Use the fol-
lowing expression to calculate timer period.
D.2.15 SWSR — Software Service Register $YFFA27
When the software watchdog is enabled, a service sequence must be written to this
register within a specific interval. When read, SWSR always returns $00. Register
shown with read value.
D.2.16 TSTMSRA — Master Shift Register A $YFFA30
Register is used for factory test only.
D.2.17 TSTMSRB — Master Shift Register B $YFFA32
Register is used for factory test only.
15 14 13 12 11 10 8 7 0
0 0 0 0 0 PIRQL PIV
RESET:
0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1
15 14 13 12 11 10 9 8 7 0
0 0 0 0 0 0 0 PTP PITM
RESET:
0 0 0 0 0 0 0 MODCLK 0 0 0 0 0 0 0 0
15 8 7 6 5 4 3 2 1 0
NOT USED 0 0 0 0 0 0 0 0
RESET:
0 0 0 0 0 0 0 0
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REGISTER SUMMARY MC68332
D-12 USER’S MANUAL
D.2.18 TSTSC — Test Module Shift Count $YFFA34
Register is used for factory test only.
D.2.19 TSTRC — Test Module Repetition Count $YFFA36
Register is used for factory test only.
D.2.20 CREG — Test Submodule Control Register $YFFA38
Register is used for factory test only.
D.2.21 DREG — Distributed Register $YFFA3A
Register is used for factory test only.
D.2.22 PORTC — Port C Data Register $YFFA41
PORTC latches data for chip-select pins that are used for discrete output.
D.2.23 CSPAR0 — Chip Select Pin Assignment Register 0 $YFFA44
Contains seven 2-bit fields, CSPA0[6:1] and CSBOOT, that determine the functions of
corresponding chip-select pins. CSPAR0[15:14] are not used. These bits always read
zero; write has no effect. CSPAR0 bit 1 always reads one; writes to CSPAR0 bit 1 have
no effect. The alternate functions can be enabled by data bus mode selection during
reset.
15 8 7 6 5 4 3 2 1 0
NOT USED 0 PC6 PC5 PC4 PC3 PC2 PC1 PC0
RESET:
0 1 1 1 1 1 1 1
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 0 CSPA0[6] CSPA0[5] CSPA0[4] CSPA0[3] CSPA0[2] CSPA0[1] CSBOOT
RESET:
0 0 DATA2 1 DATA2 1 DATA2 1 DATA1 1 DATA1 1 DATA1 1 1 DATA0
CSPAR0 Pin Assignments
CSPAR0 Field CSPAR0 Signal Alternate Signal Discrete Output
CSPA0[6] CS5 FC2 PC2
CSPA0[5] CS4 FC1 PC1
CSPA0[4] CS3 FC0 PC0
CSPA0[3] CS2 BGACK —
CSPA0[2] CS1 BG —
CSPA0[1] CS0 BR —
CSBOOT CSBOOT ——
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MC68332 REGISTER SUMMARY
USER’S MANUAL D-13
D.2.24 CSPAR1 — Chip Select Pin Assignment Register 1 $YFFA46
Contains five 2-bit fields (CSPA1[4:0]) that determine the functions of corresponding
chip-select pins. CSPAR1[15:10] are not used. These bits always read zero; write has
no effect. The CSPAR1 pin assignments table shows alternate functions that can be
enabled by data bus mode selection during reset.
*Does not apply to the CSBOOT field
D.2.25 CSBARBT — Chip Select Base Address Register Boot ROM $YFFA48
D.2.26 CSBAR[0:10] — Chip Select Base Address Registers $YFFA4C–$YFFA74
Each chip-select pin has an associated base address register. A base address is the
lowest address in the block of addresses enabled by a chip select. CSBARBT contains
the base address for selection of a bootstrap peripheral memory device. Bit and field
definition for CSBARBT and CSBAR[0:10] are the same, but reset block sizes differ.
ADDR[23:11] — Base Address
This field sets the starting address of a particular address space.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 0 0 0 0 0 CSPA1[4] CSPA1[3] CSPA1[2] CSPA1[1] CSPA1[0]
RESET:
0 0 0 0 0 0 DATA7 1 DATA6 1 DATA5 1 DATA4 1 DATA3 1
CSPAR1 Pin Assignments
CSPAR1 Field CSPAR1 Signal Alternate Signal Discrete Output
CSPA1[4] CS10 ADDR23 ECLK
CSPA1[3] CS9 ADDR22 PC6
CSPA1[2] CS8 ADDR21 PC5
CSPA1[1] CS7 ADDR20 PC4
CSPA1[0] CS6 ADDR19 PC3
Pin Assignment Field Encoding
Bit Field Description
00 Discrete Output*
01 Alternate Function*
10 Chip Select (8-Bit Port)
11 Chip Select (16-Bit Port)
15 14 13 12 11 10 9 8 7 6 5 4 3 2 0
ADDR
23 ADDR
22 ADDR
21 ADDR
20 ADDR
19 ADDR
18 ADDR
17 ADDR
16 ADDR
15 ADDR
14 ADDR
13 ADDR
12 ADDR
11 BLKSZ
RESET:
0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1
15 14 13 12 11 10 9 8 7 6 5 4 3 2 0
ADDR
23 ADDR
22 ADDR
21 ADDR
20 ADDR
19 ADDR
18 ADDR
17 ADDR
16 ADDR
15 ADDR
14 ADDR
13 ADDR
12 ADDR
11 BLKSZ
RESET:
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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REGISTER SUMMARY MC68332
D-14 USER’S MANUAL
BLKSZ — Block Size
This field determines the size of the block above the base address that is enabled by
the chip select.
D.2.27 CSORBT — Chip Select Option Register Boot ROM $YFFA4A
D.2.28 CSOR[0:10] — Chip Select Option Registers $YFFA4E–$YFFA76
Contain parameters that support bootstrap operations from peripheral memory devic-
es. Bit and field definitions for CSORBT and CSOR[0:10] are the same.
MODE — Asynchronous Bus/Synchronous E-Clock Mode
Synchronous mode cannot be used with internally generated autovectors.
0 = Asynchronous mode selected
1 = Synchronous mode selected
BYTE — Upper/Lower Byte Option
The value in this field determines whether a select signal can be asserted.
R/W — Read/Write
This field causes a chip select to be asserted only for a read, only for a write, or for
both read and write.
STRB — Address Strobe/Data Strobe
0 = Address strobe
1 = Data strobe
DSACK — Data Strobe Acknowledge
This field specifies the source of DSACK in asynchronous bus mode and controls wait
state insertion.
SPACE — Address Space Select
Block Size Encoding
BLKSZ[2:0] Block Size Address Lines Compared
000 2 K ADDR[23:11]
001 8 K ADDR[23:13]
010 16 K ADDR[23:14]
011 64 K ADDR[23:16]
100 128 K ADDR[23:17]
101 256 K ADDR[23:18]
110 512 K ADDR[23:19]
111 1 M ADDR[23:20]
15 14131211109 6543 10
MODE BYTE R/W STRB DSACK SPACE IPL AVEC
RESET:
0 111101101110000
15 14 13 12 11 10 9 6 5 4 3 1 0
MODE BYTE R/W STRB DSACK SPACE IPL AVEC
RESET:
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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MC68332 REGISTER SUMMARY
USER’S MANUAL D-15
This field selects an address space to be used by the chip-select logic.
IPL — Interrupt Priority Level
This field determines interrupt priority level when a chip select is used for interrupt ac-
knowledge. It does not affect CPU interrupt recognition.
AVEC — Autovector Enable
Do not enable autovector support when in synchronous mode.
0 = External interrupt vector enabled
1 = Autovector enabled
Option Register Function Summary
MODE BYTE R/W STRB DSACK SPACE IPL AVEC
0 = ASYNC 00 = Disable 00 = Rsvd 0 = AS 0000 = 0 WAIT 00 = CPU SP 000 = All 0 = Off
1 = SYNC 01 = Lower 01 = Read 1 = DS 0001 = 1 WAIT 01 = User SP 001 = Priority 1 1 = On
10 = Upper 10 = Write 0010 = 2 WAIT 10 = Supv SP 010 = Priority 2
11 = Both 11 = Both 0011 = 3 WAIT 11 = S/U SP 011 = Priority 3
0100 = 4 WAIT 100 = Priority 4
0101 = 5 WAIT 101 = Priority 5
0110 = 6 WAIT 110 = Priority 6
0111 = 7 WAIT 111 = Priority 7
1000 = 8 WAIT
1001 = 9 WAIT
1010 = 10 WAIT
1011 = 11 WAIT
1100 = 12 WAIT
1101 = 13 WAIT
1110 = F term
1111 = External
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REGISTER SUMMARY MC68332
D-16 USER’S MANUAL
D.3 Standby RAM Module with TPU Emulation
Table D-3 is the TPURAM address map. TPURAM responds to both program and data
space accesses. The RASP bit in the TRAMMCR determines whether the processor
must be operating at the supervisor privilege level to access the array. TPURAM con-
trol registers are accessible at the supervisor privilege level only.
Y = M111, where M is the logic state of the module mapping (MM) bit in the SIMCR.
D.3.1 TRAMMCR — TPURAM Module Configuration Register $YFFB00
STOP — Stop Control
0 = TPURAM array operates normally.
1 = TPURAM array enters low-power stop mode.
This bit controls whether the RAM array is in stop mode or normal operation. Reset
state is zero, for normal operation. In stop mode, the array retains its contents, but can-
not be read or written by the CPU.
RASP[1:0] — TPURAM Array Space Field
0 = TPURAM array is accessible from the supervisor or user privilege level.
1 = TPURAM array is accessible from the supervisor privilege level only.
D.3.2 TRAMTST — TPURAM Test Register $YFFB02
TRAMTST is used for factory test of the TPURAM module.
D.3.3 TRAMBAR — TPURAM Base Address and Status Register $YFFB04
ADDR[23:11] — TPURAM Array Base Address
These bits specify address lines ADDR[23:11] of the base address of the TPURAM
array when enabled.
Table D-3 TPURAM Address Map
Access Address 15 8 7 0
S $YFFB00 TPURAM MODULE CONFIGURATION REGISTER (TRAMMCR)
S $YFFB02 TPURAM TEST REGISTER (TRAMTST)
S $YFFB04 TPURAM BASE ADDRESS AND STATUS REGISTER (TRAMBAR)
S $YFFB06 NOT USED
15 14 13 12 11 10 9 8 7 0
STOP 0 0 0 0 0 0 RASP NOT USED
RESET:
0 0 0 0 0 0 0 1
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
ADDR
23 ADDR
22 ADDR
21 ADDR
20 ADDR
19 ADDR
18 ADDR
17 ADDR
16 ADDR
15 ADDR
14 ADDR
13 ADDR
12 ADDR
11 NOT USED RAMD
S
RESET:
0 0 0 0 0 0 0 0 0 0 0 0 0 0
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MC68332 REGISTER SUMMARY
USER’S MANUAL D-17
RAMDS — RAM Array disabled
0 = RAM array is enabled
1 = RAM array is disabled
The TPURAM array is disabled by internal logic after a master reset. Writing a valid
base address to the RAM array base address field (bits [15:3]) automatically clears
RAMDS, enabling the RAM array.
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REGISTER SUMMARY MC68332
D-18 USER’S MANUAL
D.4 Queued Serial Module
Table D-4 is the QSM address map. The column labeled “Access” indicates the privi-
lege level at which the CPU must be operating to access the register. A designation of
“S” indicates that supervisor access is required: a designation of “S/U” indicates that
the register can be programmed to the desired privilege level.
Y = M111, where M is the logic state of the module mapping (MM) bit in the SIMCR.
D.4.1 QSMCR — QSM Configuration Register $YFFC00
QSMCR bits enable stop and freeze modes, and determine the arbitration priority of
QSM interrupt requests.
STOP — Stop Enable
0 = Normal QSM clock operation
1 = QSM clock operation stopped
When STOP is set, the QSM enters low-power stop mode. System clock input to the
module is disabled. While STOP is asserted, only QSMCR reads are guaranteed to be
valid, but writes to QSPI RAM or any register are guaranteed valid. STOP is set during
Table D-4 QSM Address Map
Access Address 15 8 7 0
S $YFFC00 QSM MODULE CONFIGURATION (QSMCR)
S $YFFC02 QSM TEST (QTEST)
S $YFFC04 QSM INTERRUPT LEVEL (QILR) QSM INTERRUPT VECTOR (QIVR)
S/U $YFFC06 NOT USED
S/U $YFFC08 SCI CONTROL 0 (SCCR0)
S/U $YFFC0A SCI CONTROL 1 (SCCR1)
S/U $YFFC0C SCI STATUS (SCSR)
S/U $YFFC0E SCI DATA (SCDR)
S/U $YFFC10 NOT USED
S/U $YFFC12 NOT USED
S/U $YFFC14 NOT USED PQS DATA (PORTQS)
S/U $YFFC16 PQS PIN ASSIGNMENT (PQSPAR) PQS DATA DIRECTION (DDRQS)
S/U $YFFC18 SPI CONTROL 0 (SPCR0)
S/U $YFFC1A SPI CONTROL 1 (SPCR1)
S/U $YFFC1C SPI CONTROL 2 (SPCR2)
S/U $YFFC1E SPI CONTROL 3 (SPCR3) SPI STATUS (SPSR)
S/U $YFFC20–
$YFFCFF
NOT USED
S/U
QUEUE RAM
$YFFD00–
$YFFD1F
RECEIVE RAM (RR[0:F])
S/U
QUEUE RAM
$YFFD20–
$YFFD3F
TRANSMIT RAM (TR[0:F])
S/U
QUEUE RAM
$YFFD40–
$YFFD4F
COMMAND RAM (CR[0:F])
15 14 13 12 11 10 9 8 7 6 5 4 3 0
STOP FRZ1 FRZ0 0 0 0 0 0 SUPV 0 0 0 IARB
RESET:
0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0
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MC68332 REGISTER SUMMARY
USER’S MANUAL D-19
reset. The SCI receiver and transmitter must be disabled before STOP is set. To stop
the QSPI, set the HALT bit in SPCR3, wait until the HALTA flag is set, then set STOP.
FRZ[1:0] — Freeze Control
0 = Ignore the FREEZE signal on the IMB
1 = Halt the QSPI (on a transfer boundary)
FRZ1 determines what action is taken by the QSPI when the FREEZE signal of the
IMB is asserted. FREEZE is asserted whenever the CPU enters background mode.
FRZ0 is reserved for future use.
SUPV — Supervisor/Unrestricted
0 = Supervisor access
1 = User access
IARB — Interrupt Arbitration
Each module that generates interrupts must have an IARB value. IARB values are
used to arbitrate between interrupt requests of the same priority.
D.4.2 QTEST — QSM Test Register $YFFC02
Used for factory test only.
D.4.3 QILR — QSM Interrupt Level Register $YFFC04
QIVR — QSM Interrupt Vector Register $YFFC05
The values of the ILQSPI and ILSCI fields in QILR determine the priority of QSPI and
SCI interrupt requests. QIVR determines the value of the interrupt vector number the
QSM supplies when it responds to an interrupt acknowledge cycle. At reset, QIVR is
initialized to vector number $0F, the uninitialized interrupt vector number. To use in-
terrupt-driven serial communication, a user-defined vector number must be written to
QIVR.
ILQSPI — Interrupt Level for QSPI
When an interrupt request is made, ILQSPI value determines which of the interrupt re-
quest signals is asserted; when a request is acknowledged, the QSM compares this
value to a mask value supplied by the CPU32 to determine whether to respond. ILQS-
PI must have a value in the range $0 (lowest priority) to $7 (highest priority).
ILSCI — Interrupt Level for SCI
When an interrupt request is made, ILSCI value determines which of the interrupt re-
quest signals is asserted. When a request is acknowledged, the QSM compares this
value to a mask value supplied by the CPU32 to determine whether to respond. The
field must have a value in the range $0 (lowest priority) to $7 (highest priority).
If ILQSPI and ILSCI have the same nonzero value, and both submodules simulta-
neously request interrupt service, the QSPI has priority.
15 14 13 11 10 8 7 0
0 0 ILQSPI ILSCI INTV
RESET:
0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1
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REGISTER SUMMARY MC68332
D-20 USER’S MANUAL
INTV[7:0] — Interrupt Vector Number
The values of INTV[7:1] are the same for both QSPI and SCI interrupt requests; the
value of INTV0 used during an interrupt acknowledge cycle is supplied by the QSM.
INTV0 is at logic level zero during an SCI interrupt and at logic level one during a QSPI
interrupt. A write to INTV0 has no effect. Reads of INTV0 return a value of one.
D.4.4 SCCR0 — SCI Control Register 0 $YFFC08
SCCR0 contains the SCI baud rate selection field. Baud rate must be set before the
SCI is enabled. The CPU32 can read and write SCCR0 at any time. Changing the val-
ue of SCCR0 bits during a transfer operation can disrupt operation.
SCBR — SCI Baud Rate
SCI baud rate is programmed by writing a 13-bit value to this field. Writing a value of
zero to SCBR disables the baud rate generator. Baud clock rate is calculated as fol-
lows:
D.4.5 SCCR1 — SCI Control Register 1 $YFFC0A
SCCR1 contains SCI configuration parameters, including transmitter and receiver en-
able bits, interrupt enable bits, and operating mode enable bits. The CPU can read and
write SCCR1 at any time. The SCI can modify the RWU bit under certain circumstanc-
es. Changing the value of SCCR1 bits during a transfer operation can disrupt opera-
tion.
LOOPS — Loop Mode
0 = Normal SCI operation, no looping, feedback path disabled
1 = Test SCI operation, looping, feedback path enabled
WOMS — Wired-OR Mode for SCI Pins
0 = If configured as an output, TXD is a normal CMOS output.
1 = If configured as an output, TXD is an open-drain output.
ILT — Idle-Line Detect Type
0 = Short idle-line detect (start count on first one)
1 = Long idle-line detect (start count on first one after stop bit(s))
15 14 13 12 0
0 0 0 SCBR
RESET:
0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 LOOPS WOMS ILT PT PE M WAKE TIE TCIE RIE ILIE TE RE RWU SBK
RESET:
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
SCI Baud Clock Rate System Clock
32 SCBR×
------------------------------------=
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MC68332 REGISTER SUMMARY
USER’S MANUAL D-21
PT — Parity Type
0 = Even parity
1 = Odd parity
PE — Parity Enable
0 = SCI parity disabled
1 = SCI parity enabled
M — Mode Select
0 = 10-bit SCI frame
1 = 11-bit SCI frame
WAKE — Wakeup by Address Mark
0 = SCI receiver awakened by idle-line detection
1 = SCI receiver awakened by address mark (last bit set)
TIE — Transmit Interrupt Enable
0 = SCI TDRE interrupts inhibited
1 = SCI TDRE interrupts enabled
TCIE — Transmit Complete Interrupt Enable
0 = SCI TC interrupts inhibited
1 = SCI TC interrupts enabled
RIE — Receiver Interrupt Enable
0 = SCI RDRF and OR interrupts inhibited
1 = SCI RDRF and OR interrupts enabled
ILIE — Idle-Line Interrupt Enable
0 = SCI IDLE interrupts inhibited
1 = SCI IDLE interrupts enabled
TE — Transmitter Enable
0 = SCI transmitter disabled (TXD pin can be used as I/O)
1 = SCI transmitter enabled (TXD pin dedicated to SCI transmitter)
RE — Receiver Enable
0 = SCI receiver disabled (status bits inhibited)
1 = SCI receiver enabled
RWU — Receiver Wakeup
0 = Normal receiver operation (received data recognized)
1 = Wakeup mode enabled (received data ignored until awakened)
SBK — Send Break
0 = Normal operation
1 = Break frame(s) transmitted after completion of current frame
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REGISTER SUMMARY MC68332
D-22 USER’S MANUAL
D.4.6 SCSR — SCI Status Register $YFFC0C
SCSR contains flags that show SCI operating conditions. These flags are cleared ei-
ther by SCI hardware or by a CPU32 read/write sequence. The sequence consists of
reading SCSR, then reading or writing SCDR.
If an internal SCI signal for setting a status bit comes after the CPU32 has read the
asserted status bits, but before the CPU has written or read SCDR, the newly set sta-
tus bit is not cleared. SCSR must be read again with the bit set and SCDR must be
written or read before the status bit is cleared.
A long-word read can consecutively access both SCSR and SCDR. This action clears
receive status flag bits that were set at the time of the read, but does not clear TDRE
or TC flags. Reading either byte of SCSR causes all 16 bits to be accessed, and any
status bit already set in either byte is cleared on a subsequent read or write of register
SCDR.
TDRE — Transmit Data Register Empty
0 = Register TDR still contains data to be sent to the transmit serial shifter.
1 = A new character can now be written to register TDR.
TC — Transmit Complete
0 = SCI transmitter is busy.
1 = SCI transmitter is idle.
RDRF — Receive Data Register Full
0 = Register RDR is empty or contains previously read data.
1 = Register RDR contains new data.
RAF — Receiver Active
0 = SCI receiver is idle.
1 = SCI receiver is busy.
IDLE — Idle-Line Detected
0 = SCI receiver did not detect an idle-line condition.
1 = SCI receiver detected an idle-line condition.
OR — Overrun Error
0 = RDRF is cleared before new data arrives.
1 = RDRF is not cleared before new data arrives.
NF — Noise Error Flag
0 = No noise detected on the received data
1 = Noise occurred on the received data.
FE — Framing Error
0 = No framing error on the received data
1 = Framing error or break occurred on the received data.
15 9 8 7 6 5 4 3 2 1 0
NOT USED TDRE TC RDRF RAF IDLE OR NF FE PF
RESET:
1 1 0 0 0 0 0 0 0
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MC68332 REGISTER SUMMARY
USER’S MANUAL D-23
PF — Parity Error
0 = No parity error on the received data
1 = Parity error occurred on the received data.
D.4.7 SCDR — SCI Data Register $YFFC0E
SCDR consists of two data registers located at the same address. RDR is a read-only
register that contains data received by the SCI serial interface. Data comes into the
receive serial shifter and is transferred to RDR. TDR is a write-only register that con-
tains data to be transmitted. Data is first written to TDR, then transferred to the transmit
serial shifter, where additional format bits are added before transmission. R[7:0]/T[7:0]
contain either the first eight data bits received when SCDR is read, or the first eight
data bits to be transmitted when SCDR is written. R8/T8 are used when the SCI is con-
figured for nine-bit operation. When the SCI is configured for eight-bit operation, R8/
T8 have no meaning or effect.
D.4.8 PORTQS — Port QS Data Register $YFFC15
PORTQS latches I/O data. Writes drive pins defined as outputs. Reads return data
present on the pins. To avoid driving undefined data, first write a byte to PORTQS,
then configure DDRQS.
D.4.9 PQSPAR — PORT QS Pin Assignment Register $YFFC16
DDRQS — PORT QS Data Direction Register $YFFC17
Clearing a bit in PQSPAR assigns the corresponding pin to general-purpose I/O; set-
ting a bit assigns the pin to the QSPI. PQSPAR does not affect operation of the SCI.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 0 0 0 0 0 0 R8/T8 R7/T7 R6/T6 R5/T5 R4/T4 R3/T3 R2/T2 R1/T1 R0/T0
RESET:
0 0 0 0 0 0 0 U U U U U U U U U
15 8 7 6 5 4 3 2 1 0
NOT USED PQS7 PQS6 PQS5 PQS4 PQS3 PQS2 PQS1 PQS0
RESET:
0 0 0 0 0 0 0 0
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0PQSPA6 PQSPA5 PQSPA4 PQSPA3 0PQSPA1 PQSPA0 DDQS7 DDQS6 DDQS5 DDQS4 DDQS3 DDQS2 DDQS1 DDQS0
RESET:
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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REGISTER SUMMARY MC68332
D-24 USER’S MANUAL
DDRQS determines whether pins are inputs or outputs. Clearing a bit makes the cor-
responding pin an input; setting a bit makes the pin an output. DDRQS affects both
QSPI function and I/O function.
NOTES:
1. PQS2 is a digital I/O pin unless the SPI is enabled (SPE in
SPCR1 set), in which case it becomes SPI serial clock SCK
2. PQS7 is a digital I/O pin unless the SCI transmitter is enabled
(TE in SCCR1 set), in which case it becomes SCI serial output
TXD.
PQSPAR Pin Assignments
PQSPAR Field PQSPAR Bit Pin Function
PQSPA0 0 PQS0
1 MISO
PQSPA1 0 PQS1
1 MOSI
PQSPA2 0 PQS21
1 SCK
PQSPA3 0 PQS3
1 PCS0/SS
PQSPA4 0 PQS4
1 PCS1
PQSPA5 0 PQS5
1 PCS2
PQSPA6 0 PQS6
1 PCS3
PQSPA7 0 PQS72
1 TXD
Effect of DDRQS on PORTQS Pins
Pin DDRQS Bit Pin Function
PQS0 0 Digital Input
1 Digital Output
PQS1 0 Digital Input
1 Digital Output
PQS2 0 Digital Input
1 Digital Output
PQS2 0 Digital Input
1 Digital Output
PQS3 0 Digital Input
1 Digital Output
PQS4 0 Digital Input
1 Digital Output
PQS5 0 Digital Input
1 Digital Output
PQS6 0 Digital Input
1 Digital Output
PQS7 0 Digital Input
1 Digital Output
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MC68332 REGISTER SUMMARY
USER’S MANUAL D-25
DDRQS determines the direction of the TXD pin only when the SCI transmitter is dis-
abled. When the SCI transmitter is enabled, the TXD pin is an output.
D.4.10 SPCR0 — QSPI Control Register 0 $YFFC18
SPCR0 contains parameters for configuring the QSPI and enabling various modes of
operation. The CPU has read/write access to SPCR0, but the QSM has read access
only. SPCR0 must be initialized before QSPI operation begins. Writing a new value to
SPCR0 while the QSPI is enabled disrupts operation.
MSTR — Master/Slave Mode Select
0 = QSPI is a slave device.
1 = QSPI is system master.
NOTES:
1. PQS2 is a digital I/O pin unless the SPI is enabled (SPE in SPCR1 set), in which case it becomes
SPI serial clock SCK.
2. PQS7 is a digital I/O pin unless the SCI transmitter is enabled (TE in SCCR1 set), in which case
it becomes SCI serial output TXD.
Effect of DDRQS on QSM Pin Function
QSM Pin Mode DDRQS Bit Bit
State Pin Function
MISO Master DDQS0 0 Serial Data Input to QSPI
1 Disables Data Input
Slave 0 Disables Data Output
1 Serial Data Output from QSPI
MOSI Master DDQS1 0 Disables Data Output
1 Serial Data Output from QSPI
Slave 0 Serial Data Input to QSPI
1 Disables Data Input
SCK1Master DDQS2 0 Disables Clock Output
1 Clock Output from QSPI
Slave 0 Clock Input to QSPI
1 Disables Clock Input
PCS0/SS Master DDQS3 0 Assertion Causes Mode Fault
1 Chip-Select Output
Slave 0 QSPI Slave Select Input
1 Disables Select Input
PCS[3:1] Master DDQS 0 Disables Chip-Select Output
[4:6] 1 Chip-Select Output
Slave 0 Inactive
1 Inactive
TXD2Transmit DDQS7 X Serial Data Output from SCI
RXD Receive None NA Serial Data Input to SCI
15 14 13 10 9 8 7 0
MSTR WOMQ BITS CPOL CPHA SP
RESET:
0 0 0 0 0 0 0 1 0 0 0 0 0 1 0 0
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REGISTER SUMMARY MC68332
D-26 USER’S MANUAL
WOMQ — Wired-OR Mode for QSPI Pins
0 = Outputs have normal MOS drivers.
1 = Pins designated for output by DDRQS have open-drain drivers.
BITS — Bits Per Transfer
The BITS field determines the number of serial data bits transferred.
CPOL — Clock Polarity
0 = The inactive state value of SCK is logic level zero.
1 = The inactive state value of SCK is logic level one.
CPHA — Clock Phase
0 = Data captured on the leading edge of SCK and changed on the following edge
of SCK.
1 = Data is changed on the leading edge of SCK and captured on the following
edge of SCK.
SPBR — Serial Clock Baud Rate
QSPI baud rate is selected by writing a value from 2 to 255 into SPBR. Giving BR a
value of zero or one disables SCK (disable state determined by CPOL).
D.4.11 SPCR1 — QSPI Control Register 1 $YFFC1A
SPCR1 enables the QSPI and specified transfer delays. The CPU32 has read/write
access to SPCR1, but the QSM has read access only to all bits but enable bit SPE.
SPCR1 must be written last during initialization because it contains SPE. Writing a
new value to SPCR1 while the QSPI is enabled disrupts operation.
SPE — QSPI Enable
0 = QSPI is disabled. QSPI pins can be used for general-purpose I/O.
1 = QSPI is enabled. Pins allocated by PQSPAR are controlled by the QSPI.
DSCKL — Delay before SCK
When the DSCK bit in command RAM is set, this field determines the length of delay
from PCS valid to SCK transition. PCS can be any of the four peripheral chip-select
pins.
DTL — Length of Delay after Transfer
When the DT bit in command RAM is set, this field determines the length of delay after
serial transfer.
15 14 8 7 0
SPE DSCKL DTL
RESET:
0 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0
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MC68332 REGISTER SUMMARY
USER’S MANUAL D-27
D.4.12 SPCR2 — QSPI Control Register 2 $YFFC1C
SPCR2 contains QSPI queue pointers, wraparound mode control bits, and an interrupt
enable bit. The CPU32 has read/write access to SPCR2, but the QSM has read ac-
cess only. SPCR2 is buffered. New SPCR2 values become effective only after com-
pletion of the current serial transfer. Rewriting NEWQP in SPCR2 causes execution to
restart at the designated location. SPCR2 reads return the value of the register, not
the buffer.
SPIFIE — SPI Finished Interrupt Enable
0 = QSPI interrupts disabled
1 = QSPI interrupts enabled
WREN — Wrap Enable
0 = Wraparound mode disabled
1 = Wraparound mode enabled
WRTO — Wrap To
0 = Wrap to pointer address $0
1 = Wrap to address in NEWQP
ENDQP — Ending Queue Pointer
This field contains the last QSPI queue address.
NEWQP — New Queue Pointer Value
This field contains the first QSPI queue address.
D.4.13 SPCR3 — QSPI Control Register 3 $YFFC1E
SPSR — QSPI Status Register $YFFC1F
SPCR3 contains the loop mode enable bit, halt and mode fault interrupt enables, and
the halt control bit. The CPU has read/write access to SPCR3, but the QSM has read
access only. SPCR3 must be initialized before QSPI operation begins. Writing a new
value to SPCR3 while the QSPI is enabled disrupts operation. SPSR contains infor-
mation concerning the current serial transmission. Only the QSPI can set bits in SPSR.
The CPU reads SPSR to obtain QSPI status information and writes it to clear status
flags.
LOOPQ — QSPI Loop Mode
0 = Feedback path disabled
1 = Feedback path enabled
15 14 13 12 11 8 7 6 5 4 3 0
SPIFIE WREN WRTO 0 ENDQP 0 0 0 0 NEWQP
RESET:
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
15 14 13 12 11 10 9 8 7 6 5 4 3 0
0 0 0 0 0 LOOPQ HMIE HALT SPIF MODF HALTA 0 CPTQP
RESET:
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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REGISTER SUMMARY MC68332
D-28 USER’S MANUAL
HMIE — HALTA and MODF Interrupt Enable
0 = HALTA and MODF interrupts disabled
1 = HALTA and MODF interrupts enabled
HALT — Halt
0 = Halt not enabled
1 = Halt enabled
SPIF — QSPI Finished Flag
0 = QSPI not finished
1 = QSPI finished
MODF — Mode Fault Flag
0 = Normal operation
1 = Another SPI node requested to become the network SPI master while the QSPI
was enabled in master mode (SS input taken low).
HALTA — Halt Acknowledge Flag
0 = QSPI not halted
1 = QSPI halted
CPTQP — Completed Queue Pointer
CPTQP points to the last command executed. It is updated when the current command
is complete. When the first command in a queue is executing, CPTQP contains either
the reset value ($0) or a pointer to the last command completed in the previous queue.
D.4.14 RR[0:F] — Receive Data RAM $YFFD00–$YFFD0E
Data received by the QSPI is stored in this segment. The CPU32 reads this segment
to retrieve data from the QSPI. Data stored in receive RAM is right-justified. Unused
bits in a receive queue entry are set to zero by the QSPI upon completion of the indi-
vidual queue entry. The CPU can access the data using byte, word, or long-word ad-
dressing.
D.4.15 TR[0:F] — Transmit Data RAM $YFFD20–$YFFD3E
Data that is to be transmitted by the QSPI is stored in this segment. The CPU32 nor-
mally writes one word of data into this segment for each queue command to be exe-
cuted.
Information to be transmitted must be written to transmit data RAM in a right-justified
format. The QSPI cannot modify information in the transmit data RAM. The QSPI cop-
ies the information to its data serializer for transmission. Information remains in trans-
mit RAM until overwritten.
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MC68332 REGISTER SUMMARY
USER’S MANUAL D-29
D.4.16 CR[0:F] — Command RAM $YFFD40–$YFFD4F
*The PCS0 bit represents the dual-function PCS0/SS.
Command RAM is used by the QSPI when in master mode. The CPU32 writes one
byte of control information to this segment for each QSPI command to be executed.
The QSPI cannot modify information in command RAM.
Command RAM consists of 16 bytes. Each byte is divided into two fields. The periph-
eral chip-select field enables peripherals for transfer. The command control field pro-
vides transfer options.
A maximum of 16 commands can be in the queue. Queue execution proceeds from
the address in NEWQP through the address in ENDQP (both of these fields are in
SPCR2).
PCS[3:0] — Peripheral Chip Select
Peripheral chip-select bits are used to select an external device for serial data transfer.
More than one peripheral chip select may be activated at a time, and more than one
peripheral chip can be connected to each PCS pin, provided proper fanout is ob-
served. PCS0 shares a pin with the slave select (SS) signal, which initiates slave mode
serial transfer. If SS is taken low when the QSPI is in master mode, a mode fault oc-
curs.
CONT — Continue
0 = Control of chip selects returned to PORTQS after transfer is complete.
1 = Peripheral chip selects remain asserted after transfer is complete.
BITSE — Bits per Transfer Enable
0 = Eight bits
1 = Number of bits set in BITS field of SPCR0
DT — Delay after Transfer
The QSPI provides a variable delay at the end of serial transfer to facilitate interfacing
with peripherals that have a latency requirement. The delay between transfers is de-
termined by the SPCR1 DTL field.
DSCK — PCS to SCK Delay
0 = PCS valid to SCK transition is one-half SCK.
1 = SPCR1 DSCKL field specifies delay from PCS valid to SCK.
7 6543210
CONT BITSE DT DSCK PCS3 PCS2 PCS1 PCS0*
— — — — — — — —
CONT BITSE DT DSCK PCS3 PCS2 PCS1 PCS0*
COMMAND CONTROL PERIPHERAL CHIP SELECT
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REGISTER SUMMARY MC68332
D-30 USER’S MANUAL
D.5 Time Processor Unit
Table D-5 is the TPU address map. The column labeled “Access” indicates the privi-
lege level at which the CPU must be operating to access the register. A designation of
“S” indicates that supervisor access is required: a designation of “S/U” indicates that
the register can be programmed to the desired privilege level.
Y = M111, where M is the logic state of the module mapping (MM) bit in the SIMCR.
D.5.1 TPUMCR — TPU Module Configuration Register $YFFE00
STOP — Stop Bit
0 = TPU operating normally
1 = Internal clocks shut down
TCR1P — Timer Count Register 1 Prescaler Control
TCR1 is clocked from the output of a prescaler. The prescaler's input is the internal
TPU system clock divided by either 4 or 32, depending on the value of the PSCK bit.
The prescaler divides this input by 1, 2, 4, or 8. Channels using TCR1 have the capa-
bility to resolve down to the TPU system clock divided by 4.
Table D-5 TPU Address Map
Access Address 15 8 7 0
S $YFFE00 TPU MODULE CONFIGURATION REGISTER (TPUMCR)
S $YFFE02 TEST CONFIGURATION REGISTER (TCR)
S $YFFE04 DEVELOPMENT SUPPORT CONTROL REGISTER (DSCR)
S $YFFE06 DEVELOPMENT SUPPORT STATUS REGISTER (DSSR)
S $YFFE08 TPU INTERRUPT CONFIGURATION REGISTER (TICR)
S $YFFE0A CHANNEL INTERRUPT ENABLE REGISTER (CIER)
S $YFFE0C CHANNEL FUNCTION SELECTION REGISTER 0 (CFSR0)
S $YFFE0E CHANNEL FUNCTION SELECTION REGISTER 1 (CFSR1)
S $YFFE10 CHANNEL FUNCTION SELECTION REGISTER 2 (CFSR2)
S $YFFE12 CHANNEL FUNCTION SELECTION REGISTER 3 (CFSR3)
S/U $YFFE14 HOST SEQUENCE REGISTER 0 (HSQR0)
S/U $YFFE16 HOST SEQUENCE REGISTER 1 (HSQR1)
S/U $YFFE18 HOST SERVICE REQUEST REGISTER 0 (HSRR0)
S/U $YFFE1A HOST SERVICE REQUEST REGISTER 1 (HSRR1)
S $YFFE1C CHANNEL PRIORITY REGISTER 0 (CPR0)
S $YFFE1E CHANNEL PRIORITY REGISTER 1 (CPR1)
S $YFFE20 CHANNEL INTERRUPT STATUS REGISTER (CISR)
S $YFFE22 LINK REGISTER (LR)
S $YFFE24 SERVICE GRANT LATCH REGISTER (SGLR)
S $YFFE26 DECODED CHANNEL NUMBER REGISTER (DCNR)
15 14 13 12 11 10 9 8 7 6 5 4 3 0
STOP TCR1P TCR2P EMU T2CG STF SUPV PSCK 0 0 IARB
RESET:
0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0
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MC68332 REGISTER SUMMARY
USER’S MANUAL D-31
TCR2P — Timer Count Register 2 Prescaler Control
TCR2 is clocked from the output of a prescaler. If T2CG = 0, the input to the TCR2
prescaler is the external TCR2 clock source. If T2CG = 1, the input is the TPU system
clock divided by eight. The TCR2 field specifies the value of the prescaler: 1, 2, 4, or
8. Channels using TCR2 have the capability to resolve down to the TPU system clock
divided by 8. The following table is a summary of prescaler output.
EMU — Emulation Control
In emulation mode, the TPU executes microinstructions from MCU TPURAM exclu-
sively. Access to the TPURAM module through the IMB by a host is blocked, and the
TPURAM module is dedicated for use by the TPU. After reset, this bit can be written
only once.
0 = TPU and TPURAM not in emulation mode
1 = TPU and TPURAM in emulation mode
T2CG — TCR2 Clock/Gate Control
When the T2CG bit is set, the external TCR2 pin functions as a gate of the DIV8 clock
(the TPU system clock divided by eight). In this case, when the external TCR2 pin is
low, the DIV8 clock is blocked, preventing it from incrementing TCR2. When the exter-
nal TCR2 pin is high, TCR2 is incremented at the frequency of the DIV8 clock. When
T2CG is cleared, an external clock from the TCR2 pin, which has been synchronized
and fed through a digital filter, increments TCR2.
0 = TCR2 pin used as clock source for TCR2
1 = TCR2 pin used as gate of DIV8 clock for TCR2
STF — Stop Flag
0 = TPU operating
1 = TPU stopped (STOP bit has been asserted)
SUPV — Supervisor/Unrestricted
0 = Supervisor access
1 = User access
PSCK = 0 PSCK = 1
TCR1 Prescaler Divide
By Number of
Clocks Rate at
16 MHz Number of
Clocks Rate at
16 MHz
00 1 32 2 ms 4 250 ns
01 2 64 4 ms 8 500 ns
10 4 128 8 ms 16 1 ms
11 8 256 16 ms 32 2 ms
TCR2 Prescaler Divide By Internal Clock
Divided By External Clock
Divided By
00181
012162
104324
118648
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REGISTER SUMMARY MC68332
D-32 USER’S MANUAL
PSCK — Prescaler Clock
0 = System clock/32 is input to TCR1 prescaler
1 = System clock/4 is input to TCR1 prescaler
IARB — Interrupt Arbitration
Each module that generates interrupts must have an IARB value. IARB values are
used to arbitrate between interrupt requests of the same priority.
D.5.2 TCR — Test Configuration Register $YFFE02
The TCR is used for factory test of the MCU.
D.5.3 DSCR — Development Support Control Register $YFFE04
HOT4 — Hang on T4
0 = Exit wait on T4 state caused by assertion of HOT4
1 = Enter wait on T4 state
BLC — Branch Latch Control
0 = Latch conditions into branch condition register before exiting halted state.
1 = Do not latch conditions into branch condition register before exiting the halted
state or during the time-slot transition period.
CLKS — Stop Clocks (to TCRs)
0 = Do not stop TCRs.
1 = Stop TCRs during the halted state.
FRZ[1:0] — IMB FREEZE Response
The FRZ bits specify the TPU microengine response to the FREEZE signal.
CCL — Channel Conditions Latch
CCL controls the latching of channel conditions (MRL and TDL) when the CHAN reg-
ister is written.
0 = Only the pin state condition of the new channel is latched as a result of the write
CHAN register microinstruction.
1 = Pin state, MRL, and TDL conditions of the new channel are latched as a result
of a write CHAN register microinstruction.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
HOT4 0 0 0 0 BLC CLKS FRZ1 FRZ0 CCL BP BC BH BL BM BT
RESET:
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
FRZ[1:0] TPU Response
00 Ignore Freeze
01 Reserved
10 Freeze at End of Current Microcycle
11 Freeze at Next Time-Slot Boundary
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MC68332 REGISTER SUMMARY
USER’S MANUAL D-33
BP, BC, BH, BL, BM, and BT — Breakpoint Enable Bits
DSCR[5:0] are TPU breakpoint enables. Setting a bit enables a breakpoint condition.
BP — Break if mPC equals mPC breakpoint register.
BC — Break if CHAN register equals channel breakpoint register at beginning of state
or when CHAN is changed through microcode.
BH — Break if host service latch is asserted at beginning of state.
BL — Break if link service latch is asserted at beginning of state.
BM — Break if MRL is asserted at beginning of state.
BT — Break if TDL is asserted at beginning of state.
D.5.4 DSSR — Development Support Status Register $YFFE06
BKPT — Breakpoint Asserted Flag
If an internal breakpoint caused the TPU to enter the halted state, the TPU asserts the
BKPT signal on the IMB and the BKPT flag. The TPU continues to assert BKPT until
it recognizes a breakpoint acknowledge cycle from a host, or until the FREEZE signal
on the IMB is asserted.
PCBK — µPC Breakpoint Flag
PCBK is asserted if a breakpoint occurs because of a µPC register match with the µPC
breakpoint register. PCBK is negated when the BKPT flag is negated.
CHBK — Channel Register Breakpoint Flag
CHBK is asserted if a breakpoint occurs because of a CHAN register match with the
channel register breakpoint register. CHBK is negated when the BKPT flag is negated.
SRBK — Service Request Breakpoint Flag
SRBK is asserted if a breakpoint occurs because of any of the service request latches
being asserted along with their corresponding enable flag in the development support
control register. SRBK is negated when the BKPT flag is negated.
TPUF — TPU FREEZE Flag
TPUF is asserted whenever the TPU is in a halted state as a result of FREEZE being
asserted. This flag is automatically negated when the TPU exits the halted state be-
cause of FREEZE being negated.
D.5.5 TICR — TPU Interrupt Configuration Register $YFFE08
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 0 0 0 0 0 0 0 BKPT PCBK CHBK SRBK TPUF 0 0 0
RESET:
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
15 14 13 12 11 10 8 7 4 3 2 1 0
0 0 0 0 0 CIRL CIBV 0 0 0 0
RESET:
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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REGISTER SUMMARY MC68332
D-34 USER’S MANUAL
CIRL — Channel Interrupt Request Level
This three-bit encoded field specifies the interrupt request level for all channels. Level
seven for this field indicates a nonmaskable interrupt; level zero indicates that all chan-
nel interrupts are disabled.
CIBV — Channel Interrupt Base Vector
The TPU is assigned 16 unique interrupt vector numbers, one vector number for each
channel. The CIBV field specifies the most significant nibble of all 16 TPU channel in-
terrupt vector numbers. The lower nibble of the TPU interrupt vector number is deter-
mined by the channel number on which the interrupt occurs.
D.5.6 CIER — Channel Interrupt Enable Register $YFFE0A
CH[15:0] — Channel Interrupt Enable/Disable
0 = Channel interrupts disabled
1 = Channel interrupts enabled
D.5.7 CFSR0 — Channel Function Select Register 0 $YFFE0C
D.5.8 CFSR1 — Channel Function Select Register 1 $YFFE0E
D.5.9 CFSR2 — Channel Function Select Register 2 $YFFE10
D.5.10 CFSR3 — Channel Function Select Register 3 $YFFE12
CHANNEL[15:0] — Encoded Time Function for each Channel
Encoded four-bit fields in the channel function select registers specify one of 16 time
functions to be executed on the corresponding channel.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
CH 15 CH 14 CH 13 CH 12 CH 11 CH 10 CH 9 CH 8 CH 7 CH 6 CH 5 CH 4 CH 3 CH 2 CH 1 CH 0
RESET:
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
1514131211109876543210
CHANNEL15 CHANNEL14 CHANNEL13 CHANNEL12
RESET:
0 000000000000000
1514131211109876543210
CHANNEL11 CHANNEL10 CHANNEL9 CHANNEL8
RESET:
0 000000000000000
1514131211109876543210
CHANNEL7 CHANNEL6 CHANNEL5 CHANNEL4
RESET:
0 000000000000000
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
CHANNEL3 CHANNEL2 CHANNEL1 CHANNEL0
RESET:
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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MC68332 REGISTER SUMMARY
USER’S MANUAL D-35
D.5.11 HSQR0 — Host Sequence Register 0 $YFFE14
D.5.12 HSQR1 — Host Sequence Register 1 $YFFE16
CH[15:0] — Encoded Host Sequence
The host sequence field selects the mode of operation for the time function selected
on a given channel. The meaning of the host sequence bits depends on the time func-
tion specified.
D.5.13 HSRR0 — Host Service Request Register 0 $YFFE18
D.5.14 HSRR1 — Host Service Request Register 1 $YFFE1A
CH[15:0] — Encoded Type of Host Service
The host service request field selects the type of host service request for the time func-
tion selected on a given channel. The meaning of the host service request bits de-
pends on the time function specified.
A host service request field cleared to %00 signals the host that service is completed
by the microengine on that channel. The host can request service on a channel by writ-
ing the corresponding host service request field to one of three nonzero states. The
CPU should monitor the host service request register until the TPU clears the service
request to %00 before the CPU changes any parameters or issues a new service re-
quest to the channel.
1514131211109876543210
CH 15 CH 14 CH 13 CH 12 CH 11 CH 10 CH 9 CH 8
RESET:
0 000000000000000
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
CH 7 CH 6 CH 5 CH 4 CH 3 CH 2 CH 1 CH 0
RESET:
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
1514131211109876543210
CH 15 CH 14 CH 13 CH 12 CH 11 CH 10 CH 9 CH 8
RESET:
0 000000000000000
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
CH 7 CH 6 CH 5 CH 4 CH 3 CH 2 CH 1 CH 0
RESET:
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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REGISTER SUMMARY MC68332
D-36 USER’S MANUAL
D.5.15 CPR0 — Channel Priority Register 0 $YFFE1C
D.5.16 CPR1 — Channel Priority Register 1 $YFFE1E
CH[15:0] — Encoded One of Three Channel Priority Levels
D.5.17 CISR — Channel Interrupt Status Register $YFFE20
CH[15:0] — Channel Interrupt Status Bit
0 = Channel interrupt not asserted
1 = Channel interrupt asserted
D.5.18 LR — Link Register $YFFE22
CH[15:0] — Test Mode Link Service Request Enable Bit
0 = Link bit not asserted
1 = Link bit asserted
D.5.19 SGLR — Service Grant Latch Register $YFFE24
CH[15:0] — Service Granted Bits
1514131211109876543210
CH 15 CH 14 CH13 CH 12 CH 11 CH 10 CH 9 CH 8
RESET:
0 00 0000000000000
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
CH 7 CH 6 CH 5 CH 4 CH 3 CH 2 CH 1 CH 0
RESET:
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
CHX[1:0] Service Guaranteed Time Slots
00 Disabled —
01 Low 1 out of 7
10 Middle 2 out of 7
11 High 4 out of 7
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
CH 15 CH 14 CH 13 CH 12 CH 11 CH 10 CH 9 CH 8 CH 7 CH 6 CH 5 CH 4 CH 3 CH 2 CH 1 CH 0
RESET:
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
CH 15 CH 14 CH 13 CH 12 CH 11 CH 10 CH 9 CH 8 CH 7 CH 6 CH 5 CH 4 CH 3 CH 2 CH 1 CH 0
RESET:
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
CH 15 CH 14 CH 13 CH 12 CH 11 CH 10 CH 9 CH 8 CH 7 CH 6 CH 5 CH 4 CH 3 CH 2 CH 1 CH 0
RESET:
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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MC68332 REGISTER SUMMARY
USER’S MANUAL D-37
D.5.20 DCNR — Decoded Channel Number Register $YFFE26
CH[15:0] — Service Status Bits
D.5.21 TPU Parameter RAM
The channel parameter registers are organized as one hundred 16-bit words of RAM.
Channels 0 to 13 have six parameters. Channels 14 and 15 each have eight parame-
ters. The parameter registers constitute a shared work space for communication be-
tween the bus master and the TPU.
Y = M111, where M is the logic state of the module mapping (MM) bit in the SIMCR.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
CH 15 CH 14 CH 13 CH 12 CH 11 CH 10 CH 9 CH 8 CH 7 CH 6 CH 5 CH 4 CH 3 CH 2 CH 1 CH 0
RESET:
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Table D-6 Parameter RAM Address Map
Channel Base Parameter
Number Address 01234567
0 $YFFF## 00 02 04 06 08 0A — —
1 $YFFF## 10 12 14 16 18 1A — —
2 $YFFF## 20 22 24 26 28 2A — —
3 $YFFF## 30 32 34 36 38 3A — —
4 $YFFF## 40 42 44 46 48 4A — —
5 $YFFF## 50 52 54 56 58 5A — —
6 $YFFF## 60 62 64 66 68 6A — —
7 $YFFF## 70 72 74 76 78 7A — —
8 $YFFF## 80 82 84 86 88 8A — —
9 $YFFF## 90 92 94 96 98 9A — —
10 $YFFF## A0 A2 A4 A6 A8 AA — —
11 $YFFF## B0 B2 B4 B6 B8 BA — —
12 $YFFF## C0 C2 C4 C6 C8 CA — —
13 $YFFF## D0 D2 D4 D6 D8 DA — —
14 $YFFF## E0 E2 E4 E6 E8 EA EC EE
15 $YFFF## F0 F2 F4 F6 F8 FA FC FE
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REGISTER SUMMARY MC68332
D-38 USER’S MANUAL
Table D-7 MC68332 Module Address Map
(Assumes SIMCR MM = 1)
SIM
Access Address 15 8 7 0
S $FFFA00 MODULE CONFIGURATION (SIMCR)
S $FFFA02 FACTORY TEST (SIMTR)
S $FFFA04 CLOCK SYNTHESIZER CONTROL (SYNCR)
S $FFFA06 NOT USED RESET STATUS (RSR)
S $FFFA08 MODULE TEST E (SIMTRE)
S $FFFA0A NOT USED NOT USED
S $FFFA0C NOT USED NOT USED
S $FFFA0E NOT USED NOT USED
S/U $FFFA10 NOT USED PORTE DATA (PORTE0)
S/U $FFFA12 NOT USED PORTE DATA (PORTE1)
S/U $FFFA14 NOT USED PORTE DATA DIRECTION (DDRE)
S $FFFA16 NOT USED PORTE PIN ASSIGNMENT (PEPAR)
S/U $FFFA18 NOT USED PORTF DATA (PORTF0)
S/U $FFFA1A NOT USED PORTF DATA (PORTF1)
S/U $FFFA1C NOT USED PORTF DATA DIRECTION (DDRF)
S $FFFA1E NOT USED PORTF PIN ASSIGNMENT (PFPAR)
S $FFFA20 NOT USED SYSTEM PROTECTION CONTROL
(SYPCR)
S $FFFA22 PERIODIC INTERRUPT CONTROL (PICR)
S $FFFA24 PERIODIC INTERRUPT TIMING (PITR)
S $FFFA26 NOT USED SOFTWARE SERVICE (SWSR)
S $FFFA28 NOT USED NOT USED
S $FFFA2A NOT USED NOT USED
S $FFFA2C NOT USED NOT USED
S $FFFA2E NOT USED NOT USED
S $FFFA30 TEST MODULE MASTER SHIFT A (TSTMSRA)
S $FFFA32 TEST MODULE MASTER SHIFT B (TSTMSRB)
S $FFFA34 TEST MODULE SHIFT COUNT (TSTSC)
S $FFFA36 TEST MODULE REPETITION COUNTER (TSTRC)
S $FFFA38 TEST MODULE CONTROL (CREG)
S/U $FFFA3A TEST MODULE DISTRIBUTED (DREG)
$FFFA3C NOT USED NOT USED
$FFFA3E NOT USED NOT USED
S/U $FFFA40 NOT USED PORT C DATA (PORTC)
$FFFA42 NOT USED NOT USED
S $FFFA44 CHIP-SELECT PIN ASSIGNMENT (CSPAR0)
S $FFFA46 CHIP-SELECT PIN ASSIGNMENT (CSPAR1)
S $FFFA48 CHIP-SELECT BASE BOOT (CSBARBT)
S $FFFA4A CHIP-SELECT OPTION BOOT (CSORBT)
S $FFFA4C CHIP-SELECT BASE 0 (CSBAR0)
S $FFFA4E CHIP-SELECT OPTION 0 (CSOR0)
S $FFFA50 CHIP-SELECT BASE 1 (CSBAR1)
S $FFFA52 CHIP-SELECT OPTION 1 (CSOR1)
S $FFFA54 CHIP-SELECT BASE 2 (CSBAR2)
S $FFFA56 CHIP-SELECT OPTION 2 (CSOR2)
$FFFA58 CHIP-SELECT BASE 3 (CSBAR3)
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MC68332 REGISTER SUMMARY
USER’S MANUAL D-39
SIM
Access Address 15 8 7 0
S $FFFA5A CHIP-SELECT OPTION 3 (CSOR3)
S $FFFA5C CHIP-SELECT BASE 4 (CSBAR4)
S $FFFA5E CHIP-SELECT OPTION 4 (CSOR4)
S $FFFA60 CHIP-SELECT BASE 5 (CSBAR5)
S $FFFA62 CHIP-SELECT OPTION 5 (CSOR5)
S $FFFA64 CHIP-SELECT BASE 6 (CSBAR6)
S $FFFA66 CHIP-SELECT OPTION 6 (CSOR6)
S $FFFA68 CHIP-SELECT BASE 7 (CSBAR7)
S $FFFA6A CHIP-SELECT OPTION 7 (CSOR7)
S $FFFA6C CHIP-SELECT BASE 8 (CSBAR8)
S $FFFA6E CHIP-SELECT OPTION 8 (CSOR8)
S $FFFA70 CHIP-SELECT BASE 9 (CSBAR9)
S $FFFA72 CHIP-SELECT OPTION 9 (CSOR9)
S $FFFA74 CHIP-SELECT BASE 10 (CSBAR10)
S $FFFA76 CHIP-SELECT OPTION 10 (CSOR10)
$FFFA78 NOT USED NOT USED
$FFFA7A NOT USED NOT USED
$FFFA7C NOT USED NOT USED
$FFFA7E NOT USED NOT USED
TPURAM
Access Address 15 8 7 0
S $FFFB00 TPURAM MODULE CONFIGURATION REGISTER (TRAMMCR)
S $FFFB02 TPURAM TEST REGISTER (TRAMTST)
S $FFFB04 TPURAM BASE ADDRESS AND STATUS REGISTER (TRAMBAR)
S $FFFB06 NOT USED
QSM
Access Address 15 8 7 0
S $FFFC00 QSM MODULE CONFIGURATION (QSMCR)
S $FFFC02 QSM TEST (QTEST)
S $FFFC04 QSM INTERRUPT LEVEL (QILR) QSM INTERRUPT VECTOR (QIVR)
S/U $FFFC06 NOT USED
S/U $FFFC08 SCI CONTROL 0 (SCCR0)
S/U $FFFC0A SCI CONTROL 1 (SCCR1)
S/U $FFFC0C SCI STATUS (SCSR)
S/U $FFFC0E SCI DATA (SCDR)
S/U $FFFC10 NOT USED
S/U $FFFC12 NOT USED
S/U $FFFC14 NOT USED PQS DATA (PORTQS)
S/U $FFFC16 PQS PIN ASSIGNMENT (PQSPAR) PQS DATA DIRECTION (DDRQS)
S/U $FFFC18 SPI CONTROL 0 (SPCR0)
S/U $FFFC1A SPI CONTROL 1 (SPCR1)
S/U $FFFC1C SPI CONTROL 2 (SPCR2)
S/U $FFFC1E SPI CONTROL 3 (SPCR3) SPI STATUS (SPSR)
S/U $FFFC20–
$FFFCFF
NOT USED
S/U
QUEUE RAM
$FFFD00–
$FFFD1F
RECEIVE RAM (RR[0:F])
Table D-7 MC68332 Module Address Map (Continued)
(Assumes SIMCR MM = 1)
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REGISTER SUMMARY MC68332
D-40 USER’S MANUAL
QSM
Access Address 15 8 7 0
S/U
QUEUE RAM
$FFFD20–
$FFFD3F
TRANSMIT RAM (TR[0:F])
S/U
QUEUE RAM
$FFFD40–
$FFFD4F
COMMAND RAM (CR[0:F])
TPU
Access Address 15 8 7 0
S $FFFE00 TPU MODULE CONFIGURATION REGISTER (TPUMCR)
S $FFFE02 TEST CONFIGURATION REGISTER (TCR)
S $FFFE04 DEVELOPMENT SUPPORT CONTROL REGISTER (DSCR)
S $FFFE06 DEVELOPMENT SUPPORT STATUS REGISTER (DSSR)
S $FFFE08 TPU INTERRUPT CONFIGURATION REGISTER (TICR)
S $FFFE0A CHANNEL INTERRUPT ENABLE REGISTER (CIER)
S $FFFE0C CHANNEL FUNCTION SELECTION REGISTER 0 (CFSR0)
S $FFFE0E CHANNEL FUNCTION SELECTION REGISTER 1 (CFSR1)
S $FFFE10 CHANNEL FUNCTION SELECTION REGISTER 2 (CFSR2)
S $FFFE12 CHANNEL FUNCTION SELECTION REGISTER 3 (CFSR3)
S/U $FFFE14 HOST SEQUENCE REGISTER 0 (HSQR0)
S/U $FFFE16 HOST SEQUENCE REGISTER 1 (HSQR1)
S/U $FFFE18 HOST SERVICE REQUEST REGISTER 0 (HSRR0)
S/U $FFFE1A HOST SERVICE REQUEST REGISTER 1 (HSRR1)
S $FFFE1C CHANNEL PRIORITY REGISTER 0 (CPR0)
S $FFFE1E CHANNEL PRIORITY REGISTER 1 (CPR1)
S $FFFE20 CHANNEL INTERRUPT STATUS REGISTER (CISR)
S $FFFE22 LINK REGISTER (LR)
S $FFFE24 SERVICE GRANT LATCH REGISTER (SGLR)
S $FFFE26 DECODED CHANNEL NUMBER REGISTER (DCNR)
TPU Parameter RAM
Channel Base Parameter
Number Address 01234567
0 $FFFFF## 00 02 04 06 08 0A — —
1 $FFFFF## 10 12 14 16 18 1A — —
2 $FFFFF## 20 22 24 26 28 2A — —
3 $FFFFF## 30 32 34 36 38 3A — —
4 $FFFFF## 40 42 44 46 48 4A — —
5 $FFFFF## 50 52 54 56 58 5A — —
6 $FFFFF## 60 62 64 66 68 6A — —
7 $FFFFF## 70 72 74 76 78 7A — —
8 $FFFFF## 80 82 84 86 88 8A — —
9 $FFFFF## 90 92 94 96 98 9A — —
10 $FFFFF## A0 A2 A4 A6 A8 AA — —
11 $FFFFF## B0 B2 B4 B6 B8 BA — —
12 $FFFFF## C0 C2 C4 C6 C8 CA — —
13 $FFFFF## D0 D2 D4 D6 D8 DA — —
14 $FFFFF## E0 E2 E4 E6 E8 EA EC EE
15 $FFFFF## F0 F2 F4 F6 F8 FA FC FE
Table D-7 MC68332 Module Address Map (Continued)
(Assumes SIMCR MM = 1)
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MC68332 REGISTER SUMMARY
USER’S MANUAL D-41
Table D-8 Register Bit and Field Mnemonics
Mnemonic Name Register Location
ADDR[23:11] Base Address CSBAR[0:10], CSBARBT,
TRAMBAR
AVEC Autovector Enable CSOR[0:10], CSORBT
BP, BC, BH,
BL, BM, BT
Breakpoint Enable Points DSCR
BITS Bits Per Transfer SPCR0
BITSE Bits Per Transfer Enable CR[0:F]
BKPT Breakpoint Asserted Flag DSSR
BLC Branch Latch Control DSCR
BLKSZ Block Size CSBAR[0:10], CSBARBT
BME Bus Monitor External Enable SYPCR
BMT[1:0] Bus Monitor Timing SYPCR
BYTE Upper/Lower Byte Option CSOR[0:10], CSORBT
C Carry Flag CCR
CCL Channel Conditions Latch DSCR
CIBV Channel Interrupt Base Vector TICR
CIRL Channel Interrupt Request Level TICR
CH[15:0] Channel Function Select CFSR[0:3]
CH[15:0] Channel Interrupt Enable/Disable CIER
CH[15:0] Channel Interrupt Status CISR
CH[15:0] Channel Priority CPR[0:1]
CH[15:0] Service Status DCNR
CH[15:0] Encoded Host Sequence HSQR[0:1]
CH[15:0] Host Service Request HSRR[0:1]
CH[15:0] Link LR
CH[15:0] Service Granted SGLR
CHBK Channel Register Breakpoint Flag DSSR
CLKS Stop Clocks DSCR
CONT Continue CR[0:F]
CPHA Clock Phase SPCR0
CPOL Clock Polarity SPCR0
CPTQP Completed Queue Pointer SPSR
CSPA0[6:1] Chip-Select [6:1] CSPAR0
CSPA1[4:0] Chip-Select [4:0] CSPAR1
CSBOOT Boot ROM Chip Select CSPAR0
DDE[7:0] Port E Data Direction DDRE
DDF[7:0] Port F Data Direction DDRF
DDQS[7:0] Port QS Data Direction DDRQS
DSACK Data Strobe Acknowledge CSOR[0:10], CSORBT
DSCK PCS to SCK Delay CR[0:F]
DSCKL Delay Before SCK SPCR1
DT Delay After Transfer CR[0:F]
DTL Length of Delay After Transfer SPCR1
EMU Emulation Control TPUMCR
EDIV ECLK Divide Rate SYNCR
ENDQP Ending Queue Pointer SPCR2
EXOFF External Clock Off SIMCR
EXT External Reset RSR
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REGISTER SUMMARY MC68332
D-42 USER’S MANUAL
FE Framing Error SCSR
FRZBM Freeze Bus Monitor Enable SIMCR
FRZSW Freeze Software Enable SIMCR
FRZ[1:0] Freeze Control DSCR, QSMCR
HALT Halt SPCR3
HALTA Halt Acknowledge Flag SPSR
HLT Halt Monitor Reset RSR
HME Halt Monitor Enable SYPCR
HMIE HALTA and MODF Interrupt Enable SPCR3
HOT4 Hang on T4 DSCR
IARB[3:0] Interrupt Arbitration Field QSMCR, SIMCR, TPUMCR
IDLE Idle-Line Detected SCSR
ILIE Idle-Line Interrupt Enable SCCR1
ILQSPI Interrupt Level for QSPI QILR
ILSCI Interrupt Level for SCI QILR
ILT Idle-Line Detect Type SCCR1
INTV[7:0] Interrupt Vector Number QIVR
IP[2:0] Interrupt Priority Mask SR
IPL Interrupt Priority Level CSOR[0:10], CSORBT
LOC Loss of Clock Reset RSR
LOOPQ QSPI Loop Mode SPCR3
LOOPS Loop Mode SCCR1
M Mode Select SCCR1
MM Module Mapping SIMCR
MODE Asynchronous/Synchronous Mode CSOR[0:10], CSORBT
MODF Mode Fault Flag SPSR
MSTR Master/Slave Mode Select SPCR0
N Negative Flag CCR
NEWQP New Queue Pointer Value SPCR2
NF Noise Error SCSR
OR Overrun Error SCSR
PC[6:0] Port C Data PORTC
PCBK µPC Breakpoint Flag DSSR
PCS[3:0] Peripheral Chip Select CR[0:F]
PE Parity Enable SCCR1
PE[7:0] Port E Data PORTE
PEPA[7:0] Port E Pin Assignment PEPAR
PF Parity Error SCSR
PF[7:0] Port F Data PORTF
PFPA[7:0] Port F Pin Assignment PFPAR
PIRQL[2:0] Periodic Interrupt Request Level PICR
PITM[7:0] Periodic Interrupt Timing Modulus PITR
PIV[7:0] Periodic Interrupt Vector PICR
POW Power-Up Reset RSR
PQS[7:0] Port QS Data PORTQS
PQSPA[6:0] Port QS Pin Assignment PQSPAR
PSCK Prescaler Clock TPUMCR
PT Parity Type SCCR1
Table D-8 Register Bit and Field Mnemonics (Continued)
Mnemonic Name Register Location
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MC68332 REGISTER SUMMARY
USER’S MANUAL D-43
PTP Periodic Timer Prescaler Control PITR
RAF Receiver Active SCSR
RAMDS TPURAM Array Disable TRAMBAR
RASP[1:0] TPURAM Array Space TRAMMCR
RDRF Receive Data Register Full SCSR
RE Receiver Enable SCCR1
RIE Receiver Interrupt Enable SCCR1
RR[0:F] Receive Data RAM QSPI RAM
RSTEN Reset Enable SYNCR
R/W Read/Write CSOR[0:10], CSORBT
RWU Receiver Wakeup SCCR1
R[8:0]/T[8:0] SCI Receive/Transmit Data SCDR
S Supervisor/User State SR
SBK Send Break SCCR1
SCBR SCI Baud Rate SCCR0
SHEN[1:0] Show Cycle Enable SIMCR
SLIMP LIMP Mode SYNCR
SLOCK Synthesizer Lock SYNCR
SLVEN Factory Test Mode Enabled SIMCR
SPACE Address Space Select CSOR[0:10], CSORBT
SPBR Serial Clock Baud Rate SPCR0
SPE QSPI Enable SPCR1
SPIF QSPI Finished Flag SPSR
SPIFIE SPI Finished Interrupt Enable SPCR2
SRBK Service Request Breakpoint Flag DSSR
STEXT Stop Mode External Clock SYNCR
STF Stop Flag TPUMCR
STOP Stop Enable QSMCR, TPUMCR, TRAMMCR
STRB Address Strobe/Data Strobe CSOR[0:10], CSORBT
STSIM Stop Mode System Integration Clock SYNCR
SUPV Supervisor/Unrestricted QSMCR, SIMCR, TPUMCR
SW Software Watchdog Reset RSR
SWE Software Watchdog Enable SYPCR
SWP Software Watchdog Prescale SYPCR
SWT[1:0] Software Watchdog Timing SYPCR
SYS System Reset RSR
T[1:0] Trace Enable SR
T2CG TCR2 Clock/Gate Control TPUMCR
TC Transmit Complete SCSR
TCIE Transmit Complete Interrupt Enable SCCR1
TCR1P TCR1 Prescaler Control TPUMCR
TCR2P TCR2 Prescaler Control TPUMCR
TDRE Transmit Data Register Empty SCSR
TE Transmitter Enable SCCR1
TIE Transmit Interrupt Enable SCCR1
TPUF TPU FREEZE Flag DSSR
TR[0:F] Transmit Data RAM QSPI RAM
TST Test Submodule Reset RSR
Table D-8 Register Bit and Field Mnemonics (Continued)
Mnemonic Name Register Location
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REGISTER SUMMARY MC68332
D-44 USER’S MANUAL
V Overflow Flag CCR
W Frequency Control (VCO) SYNCR
WAKE Wakeup by Address Mark SCCR1
WOMQ Wired-OR Mode for QSPI Pins SPCR0
WOMS Wired-OR Mode for SCI Pins SCCR1
WREN Wrap Enable SPCR2
WRTO Wrap To SPCR2
X Extend CCR
X Frequency Control Bit (Prescale) SYNCR
Y[5:0] Frequency Control (Counter) SYNCR
Z Zero Flag CCR
Table D-8 Register Bit and Field Mnemonics (Continued)
Mnemonic Name Register Location
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MC68332 SUMMARY OF CHANGES
USER’S MANUAL S-1
SUMMARY OF CHANGES
This is a complete revision, with complete reprint. All known errors in the publication
have been corrected. The following summary lists significant changes.
Section 1 Introduction
Page 1-1 New introduction to the MC68332 microcontroller.
Section 2 Nomenclature
Page 2-1 Added “Symbols and Operators” section.
Page 2-2 Added “CPU32 Registers” section.
Pages 2-3 – 2-4 Added “Pin and Signal Mnemonics” section.
Pages 2-5 – 2-6 Added “Register Mnemonics” section.
Page 2-7 Added “Conventions” section.
Section 3 Overview
Page 3-3 New block diagram drawn.
Pages 3-4 – 3-5 New 132-pin package and 144-pin package pin assign-
ment diagrams drawn.
Pages 3-6 – 3-7 Revised pin characteristics.
Page 3-8 Incorporated VDD/VSS breakout information.
Pages 3-9 – 3-11 Revised signal characteristics and signal function tables.
Pages 3-12 – 3-17 New system memory maps drawn.
Section 4 System Integration Module
Pages 4-1 – 4-70 Expanded and revised SIM section. Made all register dia-
grams and bit mnemonics consistent. Incorporated new in-
formation concerning the system clock, resets, interrupts,
and chip-select circuits.
Section 5 Central Processing Unit
Pages 5-1 – 5-30 Expanded and revised CPU section. Made all register dia-
grams and bit mnemonics consistent. Revised instruction
set summary information.
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SUMMARY OF CHANGES MC68332
S-2 USER’S MANUAL
Section 6 Queued Serial Module
Pages 6-1 – 6-36 Expanded and revised QSM section. Made all register di-
agrams and bit mnemonics consistent. Added information
concerning SPI and SCI operation.
Section 7 Time Processor Unit
Pages 7-1 – 7-18 Expanded and revised TPU section. Made all register dia-
grams and bit mnemonics consistent. Revised time func-
tions information to include both MC68332A and
MC68332G microcode ROM applications.
Section 8 Standby RAM with TPU Emulation
Pages 8-1 – 8-4 Revised Standby RAM with TPU Emulation section. Made
all register diagrams and bit mnemonics consistent.
Appendix a Electrical Characteristics
Pages A-1 – A-30 Completely revised electrical characteristics section. Add-
ed 20.97 MHz timing parameters.
Appendix B Mechanical Data and Ordering Information
Pages B-1 – B-10 Revised MC68332 132-pin assignment drawing. Included
new diagrams on 144-pin assignment and package dimen-
sions. Revised ordering information table.
Appendix C Development Support
Pages C-1 – C-2 New information on the M68MMDS1632 Modular Devel-
opment System and the M68MEVB1632 Modular Evalua-
tion Board.
Appendix D Register Summary
Pages D-1 – D-50 Revised address maps and register diagrams. Includes a
new register bit and field mnemonics table.
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MC68332
USER’S MANUAL I-1
–A–
Address bus 4-18
Address registers
fault 5-20
general-purpose 5-1
Address strobe (AS) 4-18
Addressing modes 5-8
Addressing range 5-8
Address-mark wakeup 6-30
AS 4-18
Autovector signal (AVEC) 4-20
AVEC 4-20, 4-48, 4-53, 4-55
–B–
Baud rate, SCK 6-17
BCD 5-4
BDM 5-17
BERR 4-5, 4-20, 4-48
BG 4-53
BGACK 4-53
Binary-coded decimal (BCD) 5-4
BITS 6-21
Bit-time 6-25
BKPT 4-28, 4-41, 5-9
BLKSZ 4-53
BMT 4-5
BR 4-53
Break frame 6-26
Break frames 6-28
Bus error signal (BERR) 4-5, 4-20
Bus monitor timing (BMT) 4-5
BYTE 4-54
–C–
C 5-5
Call user code (CALL) 5-20
Carry (C) 5-5
CCR 5-5
Central processing unit (CPU) 3-1
Channel interrupt enable register (CIER) 7-14
Channel interrupt request level (CIRL) 7-5
Channel interrupt status register (CISR) 7-11, 7-14
Chip select pin assignment register 1 (CSPAR1) 4-15
Chip selects
peripheral 6-22
Chip-select
block 4-1
Chip-select operation 4-55
Chip-select pins 4-51
CIER 7-14
CIRL 7-5
CISR 7-11, 7-14
Clock mode (MODCLK) 4-10
Clock synthesizer control register (SYNCR) 4-10
Command RAM 6-8
Completed queue pointer 6-9
Condition code register 5-5
Condition codes 5-5
Control registers
QSPI 6-7
SCI 6-22
CPHA 6-17
CPOL 6-17
CPTQP 6-9, 6-20
CPU 1-1, 3-1
CPU32 1-1, 5-1
CPU32 Registers 2-2
CSBARBT 4-53
CSBOOT 4-40, 4-53, 4-57
CSPAR1 4-15
Current instruction program counter (PCC) 5-20
–D–
Data and size acknowledge signals (DSACK) 4-19
Data bus 4-18
Data frame 6-26
Data register 5-3, 5-4
Data registers
multifunction 5-1
SCI 6-25
Data strobe (DS) 4-18
DDQS1 6-4
DDRE 4-58
DDRF 4-58
DDRQS 6-4, 6-17, 6-21
Delay after transfer 6-19
Discrete I/O 4-58
Double buffering 6-27, 6-28
DS 4-18
DSACK 4-19, 4-48, 4-53, 4-54, 4-55
DSCK 6-18
–E–
EBI 4-1, 4-17, 4-56
EBI transfers 4-56
INDEX
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MC68332
I-2 USER’S MANUAL
ECLK 4-15
EDIV 4-15
End queue pointer 6-9
ENDQP 6-9
Error flags, SCI 6-29
Exception vector table 6-3
Exceptions
internal 5-14
processing 5-15
EXTAL 4-7
Extend (X) 5-5
External bus clock signal (ECLK) 4-15
External bus interface (EBI) 4-1
External clock division (EDIV) 4-15
–F–
FAR 5-20
Fast termination 4-26
Fault address register (FAR) 5-20
FE 6-29
Features 3-1
Frame 6-26
Framing error (FE) flag 6-29
Framing errors 6-29
FREEZE 4-9
Freeze bus monitor (FRZBM) 4-9
Freeze operation 6-3
Freeze software watchdog (FRZSW) 4-9
FRZ 6-3
FRZBM 4-9
FRZSW 4-9
–G–
General-purpose I/O 4-58
–H–
HALT 4-20
Halt signal (HALT) 4-20
Hardware breakpoint 4-28
–I–
IARB 4-3, 4-4, 4-47, 4-56, 7-5
Idle frame 6-26
Idle line interrupt enable (ILIE) 6-30
Idle line type (ILT) 6-29
Idle-line detection 6-29
Idle-line wakeup 6-30
IFETCH 5-22
ILIE 6-30
ILQSPI 6-3
ILSCI 6-3
ILT 6-29
IMB 3-9
Instruction execution
loop mode 5-23
Instruction set 5-9
Instructions
ABCD 5-4
BCD 5-4
low-power stop 5-13
MOVEC 5-6
NBCD 5-4
SBCD 5-4
special 5-9
TBL 5-13
instructions
MOVES 5-6
Intermodule bus (IMB) 3-9
Internal bus monitor 4-5
Internal DSACK generation 4-55
Internal loop 6-30
Internal queue pointer 6-9
Interrupt arbitration (IARB) 4-3
Interrupt handler routines 6-3
Interrupt priority (IP) 5-5, 7-5
Interrupt priority (IP) mask 6-3
Interrupt request signals 4-46
Interrupt vector number 6-3
Interrupts
QSM 6-3
SCI 6-30
IP 5-5, 7-5
IP mask 6-3
IPIPE 5-22
IPL 4-54
IRQ 4-46
–L–
Limp status bit (SLIMP) 4-16
Long idle-line detection 6-29
Loop mode 5-23
LOOPS 6-30
Low-power operation 4-15
Low-power stop (LPSTOP) 4-31, 5-13
Low-power stop operation 6-2
LPSTOP 4-8, 4-15, 4-31, 5-13, 6-2
–M–
M bit 6-26
Mark 6-28
Master mode, QSPI 6-10, 6-17
Master wraparound 6-20
Memory maps 3-9
MISO 6-17, 6-20
MM 4-3
Mnemonics 2-3, 2-4
MODCLK 4-7, 4-10, 4-16, 4-41
MODE 4-54
Module mapping bit (MM) 4-3
Modulus counter (PITCLK) 4-7
MOSI 6-17, 6-20
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MC68332
USER’S MANUAL I-3
MSTR 6-10, 6-17
Multimaster operation 6-10
–N–
N 5-5
Negative (N) 5-5
New queue pointer 6-9
NEWQP 6-9, 6-20, 6-22
NF 6-29
Noise errors 6-29
Noise flag (NF) 6-29
NRZ 6-26
–O–
Operand alignment 4-21
Overflow (V) 5-5
Overrun error (OR) 6-29
–P–
Parameter RAM 7-3
Parity checking 6-27
Parity enable (PE) 6-27
Parity errors 6-29
Parity flag (PF) 6-29
Parity type (PT) 6-27
PC 5-1, 5-5
PCS 6-17
PCS0/SS 6-20
PE 6-27
PEPAR 4-58
Periodic interrupt control register (PICR) 4-8
Periodic interrupt request level (PIRQL) 4-8
Periodic interrupt timer register (PITR) 4-7
Periodic interrupt vector (PIV) 4-8
Periodic timer modulus (PITM) 4-7
Periodic timer prescaler (PTP) 4-7
Peripheral chip-select signals 6-22
PF 6-29
PFPAR 4-58
PICR 4-8, 4-48
Pin control registers
QSM 6-3
Pins
QSPI 6-8
SCI 6-25
PIRQ 4-48
PIRQL 4-8
PITCLK 4-7
PITM 4-7
PITR 4-7
PIV 4-8
Port QS data direction register (DDRQS) 6-4
Port QS data register (PORTQS) 6-4
Port QS pin assignment register 6-25
Port QS pin assignment register (PQSPAR) 6-3
PORTC 4-55
PORTE 4-58
PORTF 4-58
PORTQS 6-4
PQSPAR 6-3, 6-17, 6-20, 6-25
Privilege level
supervisor 5-5
Privilege levels 5-9
user
supervisor 5-2
Processing
background 5-9
exception 5-8
halted 5-9
Program counter 5-5
Program counter (PC) 5-1
PT 6-27
PTP 4-7
–Q–
QILR 6-2
QIVR 6-2
QSM 1-1, 3-2, 6-1
QSM configuration register (QSMCR) 6-2
QSM global registers 6-2
QSM initialization 6-31
QSM interrupt level register (QILR) 6-2
QSM interrupt vector register (QIVR) 6-2
QSM interrupts 6-3
QSM pin control registers 6-3
QSMCR 6-2
QSPI 6-1, 6-4
QSPI block diagram
QSPI 6-6
QSPI master operation 6-12
QSPI operating modes 6-10
QSPI Pins 6-8
QSPI RAM 6-7
QSPI registers 6-6
QSPI slave operation 6-15
QSPI status register (SPSR) 6-7
Queue entry 6-9
Queue pointers 6-9
Queued serial module (QSM) 3-2, 6-1
Queued serial peripheral interface (QSPI) 6-4
–R–
R/W 4-18, 4-54
RAM, QSPI 6-7
command 6-8
receive 6-7
transmit 6-8
RDR 6-28
RDRF 6-29
RE 6-28
Read cycle 4-24
Read/write (R/W) 4-18
Receive data (RXD) 6-25
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MC68332
I-4 USER’S MANUAL
Receive data register (RDR) 6-28
Receive RAM 6-7
Receive time (RT) clock 6-29
Receive time (RT) sampling clock 6-26
Receiver data register flag (RDRF) 6-29
Receiver enable (RE) 6-28
Receiver operation 6-28
Receiver wakeup function 6-30
Registers
address 5-5
condition code 5-5
control 5-5
data 5-1
DFC 5-6
function code 5-6
general-purpose 5-1
QSPI 6-6
SFC 5-6
special purpose 5-1
status 5-5
vector base 5-6
RESET 4-37, 4-41, 5-9
Reset control logic 4-38
Reset enable (RSTEN) 4-16
Reset status register (RSR) 4-4, 4-46
Reset timing 4-43
Resume execution (GO) 5-20
Return program counter (RPC) 5-20
RSR 4-4, 4-46
RSTEN 4-16
RT clock 6-26, 6-29
RWU 6-30
RXD 6-25
RXD pin 6-29
–S–
SBK 6-28
SCDR 6-25, 6-28
SCI 6-1, 6-22
control registers 6-22
data register (SCDR) 6-25
error flags 6-29
SCI baud clock 6-26
SCI data register (SCDR) 6-28
SCI pins 6-25
SCI registers 6-22
SCI status register (SCSR) 6-25
SCK 6-17, 6-20
SCSR 6-25
Send break (SBK) 6-28
Serial communication interface (SCI) 6-22
Serial formats 6-26
Serial interface 5-21
Serial mode (M) bit 6-26
Serial peripheral interface
protocol 5-21
SHEN 4-37
Short idle-line detection 6-29
SIM 1-1, 3-1, 4-1
SIM configuration register (SIMCR) 4-3
SIMCLK 4-16
SIMCR 3-10, 4-3
SIZ0 4-19
SIZ1 4-19
Slave enable (SLVEN) 4-4
Slave mode, QSPI 6-10, 6-20
Slave wraparound 6-22
SLIMP 4-16
SLVEN 4-4
Software breakpoints 4-28
Software watchdog prescale (SWP) 4-6
Software watchdog timing (SWT) 4-6
SP 5-1
SPACE 4-54
SPBR 6-17
SPE 6-7, 6-19
SPSR 6-7
Spurious interrupt monitor 4-5
SR 5-5
SS 6-10
Stack pointers (SP) 5-1
Start bit 6-26
Static RAM with TPU emulation (TPURAM) 3-2
Status register
QSPI 6-7
Status register (SR) 5-5
Status registers
SCI 6-25
STEXT 4-16
Stop bit 6-26
STRB 4-54
STSIM 4-16
Supervisor data space 4-4
Supervisor privilege level 5-2
Supervisor stack pointer (SSP) 5-9
SUPV 4-4
SWP 4-6
SWT 4-6
Symbols 2-1
SYNCR 4-10
SYPCR 4-5, 4-6
System clock 4-1, 4-9
System configuration and protection 4-1, 4-2
System integration module (SIM) 3-1, 4-1
System integration module configuration register (SIM-
CR) 3-10
System protection control register (SYPCR) 4-5
System test block 4-1
–T–
Table lookup and interpolate (TBL) 5-13
TBL 5-13
TC 6-28
TCIE 6-28
TCR1 7-12
TCR2 7-12
TDRE 6-28
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MC68332
USER’S MANUAL I-5
TE 6-27
TICR 7-12
TIE 6-28
Time processor unit (TPU) 3-1, 7-1
Timer control registers
TCR1 7-12
TCR2 7-12
TPU 1-1, 3-1
TPU functions
enhanced 7-6
standard 7-6
TPU module configuration register (TPUMCR) 7-2
TPUMCR 7-2, 7-12
TPURAM 1-1, 3-2, 8-1
Transfer delay 6-19
Transfer length 6-18
Transmission complete (TC) 6-28
Transmission complete interrupt enable (TCIE) 6-28
Transmit data (TXD) 6-25
Transmit interrupt enable (TIE) 6-28
Transmit RAM 6-8
Transmitter enable (TE) 6-27
TXD 6-25, 6-27
–U–
Uninitialized interrupt vector 6-3
User data space 4-4
User privilege level 5-2
User stack pointer (USP) 5-9
–V–
V 5-5
VBR 3-10, 4-46, 5-6, 5-13
VCO 4-11
Vector base register (VBR) 3-10, 5-6, 5-13
Voltage controlled oscillator (VCO) 4-11
–W–
WAKE 6-30
Wakeup, receiver 6-30
Wired-OR mode select bit (WOMS) 6-27
WOMS 6-27
WREN 6-20
Write cycle 4-25
–X–
X 5-5
–Z–
Z 5-5
Zero (Z) 5-5
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