MC68331
USER’S MANUAL
OVERVIEW
MOTOROLA
3-1
3
SECTION 3OVERVIEW
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 MCU 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
PLL System Clock for Low Power Operation
Background Debugging Mode
3.1.2 Central Processing Unit (CPU32)
Instruction Set Supports 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 Queued Serial Module (QSM)
Serial Communication Interface (SCI), Enhanced Universal Asynchronous Re-
ceiver Transmitter (UART) with Modulus Baud Rate, Parity
Queued Serial Peripheral Interface (SPI), High Speed Bidirectional Interface, 80-
Byte RAM, Up to 16 Automatic Transfers
Dual Function I/O Ports
Continuous Cycling, 8 to 16 Bits per Transfer