MC68HC705J1ACPE Datasheet, PDF (97/162 Pages) Freescale Semiconductor, Inc – Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.
Technical Data — MC68HC705J1A
Section 7. Computer Operating Properly (COP) Module
7.1 Contents
7.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
7.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
7.3.1 COP Watchdog Timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
7.3.2 COP Watchdog Timeout Period . . . . . . . . . . . . . . . . . . . . . . 98
7.3.3 Clearing the COP Watchdog . . . . . . . . . . . . . . . . . . . . . . . .98
7.4 Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
7.5 COP Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99
7.6 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
7.6.1 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100
7.6.2 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100
7.2 Introduction
The computer operating properly (COP) watchdog resets the
microcontroller (MCU) in case of software failure. Software that is
operating properly periodically services the COP watchdog and prevents
COP reset. The COP watchdog function is programmable by the
COPEN bit in the mask option register.
Features include:
• Protection from runaway software
• Wait and halt mode operation
MC68HC705J1A — Rev. 4.0
Computer Operating Properly (COP) Module
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Technical Data