MC68CK338 データシートの表示（PDF） - Freescale Semiconductor

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MC68CK338

32-Bit Modular Microcontroller

Freescale Semiconductor 

Freescale Semiconductor, Inc.

3 Low-Power System Integration Module

The low-power system integration module (SIML) consists of five functional blocks that control system

startup, initialization, configuration, and the external bus. Figure 4 shows the SIML block diagram.

SYSTEM CONFIGURATION

CLOCK SYNTHESIZER

SYSTEM PROTECTION

XTAL

CLKOUT

EXTAL

MODCLK

CHIP-SELECTS

CHIP-SELECTS

EXTERNAL BUS INTERFACE

FACTORY TEST

Figure 4 SIML Block Diagram

EXTERNAL BUS

RESET

TSC

FREEZE/QUOT

338 S(C)IM BLOCK

3.1 Overview

The system configuration block controls MCU configuration and operating mode.

The clock synthesizer generates clock signals used by the SIML, other IMB modules, and external de-

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

The system protection block provides bus and software watchdog monitors.

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

dress space.

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.

Table 7 shows the SIML address map, which occupies 128 bytes. Unused registers within the 128-byte

address space return zeros when read. The “Access” column 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 SIMLCR.

MOTOROLA

12

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MC68CK338

MC68CK338TS/D

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