M68ICS08GR datasheet(133/408 Pages) FREESCALE

133 / 408 page

MC68HC908GR8 — Rev 4.0

Technical Data

MOTOROLA

Computer Operating Properly (COP)

133

Technical Data — MC68HC908GR8

Section 9. Computer Operating Properly (COP)

9.1 Contents

9.2

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

9.3

Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

9.4

I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135

9.5

COP Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

9.6

Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

9.7

Monitor Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

9.8

Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .137

9.9

COP Module During Break Mode . . . . . . . . . . . . . . . . . . . . . .137

9.2 Introduction

The computer operating properly (COP) module contains a free-running

counter that generates a reset if allowed to overflow. The COP module

helps software recover from runaway code. Prevent a COP reset by

clearing the COP counter periodically. The COP module can be disabled

through the COPD bit in the CONFIG register.

9.3 Functional Description

Figure 9-1 shows the structure of the COP module.

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