M68ICS08GR datasheet(129/408 Pages) FREESCALE

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MC68HC908GR8 — Rev 4.0

Technical Data

MOTOROLA

Configuration Register (CONFIG)

129

Technical Data — MC68HC908GR8

Section 8. Configuration Register (CONFIG)

8.1 Contents

8.2

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

8.3

Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

8.2 Introduction

This section describes the configuration registers, CONFIG1 and

CONFIG2. The configuration registers enable or disable these options:

•

Stop mode recovery time (32 CGMXCLK cycles or 4096

CGMXCLK cycles)

•

COP timeout period (218 – 24 or 213 – 24 CGMXCLK cycles)

•

STOP instruction

•

Computer operating properly module (COP)

•

Low-voltage inhibit (LVI) module control and voltage trip point

selection

•

Enable/disable the oscillator (OSC) during stop mode

8.3 Functional Description

The configuration registers are used in the initialization of various

options. The configuration registers can be written once after each reset.

All of the configuration register bits are cleared during reset. Since the

various options affect the operation of the MCU, it is recommended that

these registers be written immediately after reset. The configuration

registers are located at $001E and $001F. The configuration register

may be read at anytime.

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