HC708KL8GRSSLASHD datasheet(74/246 Pages) NXP

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System Integration Module (SIM)

General Release Specification

MC68HC708KL8 — Rev. 2.1

System Integration Module (SIM)

Freescale Semiconductor

8.7

Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

8.7.1

Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

8.7.2

Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

8.8

SIM Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

8.8.1

Break Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

8.8.2

Reset Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

8.8.3

Break Flag Control Register . . . . . . . . . . . . . . . . . . . . . . . . 97

8.2 Introduction

This section describes the system integration module (SIM), which

supports up to 16 external and/or internal interrupts. Together with the

CPU, the SIM controls all MCU activities. The SIM is a system state

controller that coordinates CPU and exception timing. A block diagram

of the SIM is shown in Figure 8-1. Table 8-1 is a summary of the SIM

I/O registers.

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

–

Vector address generation

•

CPU enable/disable timing

•

Modular architecture expandable to 128 interrupt sources

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