Datasheet

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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