MC68HC705P9CS datasheet(95/160 Pages) FREESCALE

95 / 160 page

MC68HC705P9 — Rev. 4.0

Technical Data

MOTOROLA

Computer Operating Properly Watchdog (COP)

Technical Data — MC68HC705P9

Section 8. Computer Operating Properly Watchdog (COP)

8.1 Contents

8.2

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

8.3

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

8.4

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

8.4.1

COP Watchdog Timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

8.4.2

COP Watchdog Timeout Period . . . . . . . . . . . . . . . . . . . . . . 96

8.4.3

Clearing the COP Watchdog . . . . . . . . . . . . . . . . . . . . . . . .97

8.5

Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

8.6

COP Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97

8.7

Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

8.7.1

Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .98

8.7.2

Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .98

8.2 Features

Features include:

•

Protection from runaway software

•

65.5-ms timeout period (with 2-MHz bus frequency)

•

Wait mode operation

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