M68ICS08GR datasheet(271/408 Pages) FREESCALE

271 / 408 page

MC68HC908GR8 — Rev 4.0

Technical Data

MOTOROLA

System Integration Module (SIM)

271

Technical Data — MC68HC908GR8

Section 19. System Integration Module (SIM)

19.1 Contents

19.2

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 271

19.3

SIM Bus Clock Control and Generation . . . . . . . . . . . . . . . . . 275

19.4

Reset and System Initialization. . . . . . . . . . . . . . . . . . . . . . . . 276

19.5

SIM Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281

19.6

Exception Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282

19.7

Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .290

19.8

SIM Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293

19.2 Introduction

This section describes the system integration module (SIM). Together

with the CPU, the SIM controls all MCU activities. A block diagram of the

SIM is shown in Figure 19-1. Table 19-1 is a summary of the SIM

input/output (I/O) registers. The SIM is a system state controller that

coordinates CPU and exception timing. The SIM is responsible for:

•

Bus clock generation and control for CPU and peripherals:

–

Stop/wait/reset/break entry and recovery

–

Internal clock control

•

Master reset control, including power-on reset (POR) and COP

timeout

•

Interrupt control:

–

Acknowledge timing

–

Arbitration control timing

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