MC68331TS datasheet(14/84 Pages) FREESCALE

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MC68331TS/D

3 System Integration Module

The system integration module (SIM) consists of five functional blocks that control system start-up, ini-

tialization, configuration, and external bus.

Figure 5 SIM Block Diagram

3.1 Overview

The system configuration and protection block controls MCU configuration and operating mode. The

block also provides bus and software watchdog monitors.

The system clock generates clock signals used by the SIM, other IMB modules, and external devices.

In addition, a periodic interrupt generator supports execution of time-critical control routines.

The external bus interface handles the transfer of information between IMB modules and external ad-

dress space.

The chip-select block provides eleven general-purpose chip-select signals and a boot ROM chip-select

signal. Both general-purpose and boot ROM chip-select signals have associated base address regis-

ters and option registers.

The system test block incorporates hardware necessary for testing the MCU. It is used to perform fac-

tory tests, and its use in normal applications is not supported.

The SIM control register address map occupies 128 bytes. Unused registers within the 128-byte ad-

dress space return zeros when read. The “Access” column in the SIM address map below indicates

which registers are accessible only at the supervisor privilege level and which can be assigned to either

the supervisor or user privilege level, according to the value of the SUPV bit in the SIMCR.

300 S(C)IM BLOCK

SYSTEM CONFIGURATION

CLOCK SYNTHESIZER

CHIP SELECTS

EXTERNAL BUS INTERFACE

FACTORY TEST

CLKOUT

EXTAL

MODCLK

CHIP SELECTS

EXTERNAL BUS

RESET

TSC

FREEZE/QUOT

XTAL

SYSTEM PROTECTION

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