MOTOROLA
MC68336/376
vi
USER’S MANUAL
(Continued)
Paragraph
Title
Page
TABLE OF CONTENTS
5.6.4.2
LPSTOP Broadcast Cycle ....................................................... 5-34
5.6.5
Bus Exception Control Cycles ......................................................... 5-34
5.6.5.1
Bus Errors ............................................................................... 5-36
5.6.5.2
Double Bus Faults ................................................................... 5-36
5.6.5.3
Retry Operation ....................................................................... 5-37
5.6.5.4
Halt Operation ......................................................................... 5-37
5.6.6
External Bus Arbitration ................................................................... 5-38
5.6.6.1
Show Cycles ........................................................................... 5-39
5.7
Reset ....................................................................................................... 5-40
5.7.1
Reset Exception Processing ........................................................... 5-40
5.7.2
Reset Control Logic ......................................................................... 5-40
5.7.3
Reset Mode Selection ..................................................................... 5-41
5.7.3.1
Data Bus Mode Selection ........................................................ 5-42
5.7.3.2
Clock Mode Selection ............................................................. 5-44
5.7.3.3
Breakpoint Mode Selection ..................................................... 5-45
5.7.4
MCU Module Pin Function During Reset ........................................ 5-45
5.7.5
Pin States During Reset .................................................................. 5-46
5.7.5.1
Reset States of SIM Pins ........................................................ 5-46
5.7.5.2
Reset States of Pins Assigned to Other MCU Modules .......... 5-47
5.7.6
Reset Timing ................................................................................... 5-47
5.7.7
Power-On Reset .............................................................................. 5-48
5.7.8
Use of the Three-State Control Pin ................................................. 5-49
5.7.9
Reset Processing Summary ............................................................ 5-50
5.7.10
Reset Status Register ..................................................................... 5-50
5.8
Interrupts ................................................................................................. 5-50
5.8.1
Interrupt Exception Processing ....................................................... 5-50
5.8.2
Interrupt Priority and Recognition .................................................... 5-51
5.8.3
Interrupt Acknowledge and Arbitration ............................................ 5-52
5.8.4
Interrupt Processing Summary ........................................................ 5-53
5.8.5
Interrupt Acknowledge Bus Cycles .................................................. 5-54
5.9
Chip-Selects ............................................................................................ 5-54
5.9.1
Chip-Select Registers ...................................................................... 5-57
5.9.1.1
Chip-Select Pin Assignment Registers ................................... 5-57
5.9.1.2
Chip-Select Base Address Registers ...................................... 5-58
5.9.1.3
Chip-Select Option Registers .................................................. 5-59
5.9.1.4
Port C Data Register ............................................................... 5-60
5.9.2
Chip-Select Operation ..................................................................... 5-60
5.9.3
Using Chip-Select Signals for Interrupt Acknowledge ..................... 5-61
5.9.4
Chip-Select Reset Operation ........................................................... 5-62
5.10
Parallel Input/Output Ports ...................................................................... 5-64
5.10.1
Pin Assignment Registers ............................................................... 5-64
336376UMBook Page vi Friday, November 15, 1996 2:09 PM