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Motorola MC68HC908AB32 - Introduction; Section 20. Computer Operating Properly (COP)

Motorola MC68HC908AB32
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MC68HC908AB32Rev. 1.0 Technical Data
MOTOROLA Computer Operating Properly (COP) 353
Technical Data — MC68HC908AB32
Section 20. Computer Operating Properly (COP)
20.1 Contents
20.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .353
20.3 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .354
20.4 I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .355
20.4.1 CGMXCLK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .355
20.4.2 STOP Instruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .355
20.4.3 COPCTL Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .355
20.4.4 Power-On Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .355
20.4.5 Internal Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .356
20.4.6 Reset Vector Fetch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .356
20.4.7 COPD (COP Disable). . . . . . . . . . . . . . . . . . . . . . . . . . . . .356
20.4.8 COPRS (COP Rate Select) . . . . . . . . . . . . . . . . . . . . . . . .356
20.5 COP Control Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .357
20.6 Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .357
20.7 Monitor Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .357
20.8 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .357
20.8.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .358
20.8.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .358
20.9 COP Module During Break Mode. . . . . . . . . . . . . . . . . . . . . .358
20.2 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 configuration register 1 (CONFIG1).

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