M68HC08 Datasheet, PDF (47/188 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Data Sheet — MC68HC908RF2
Section 4. Computer Operating Properly Module (COP)
4.1 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 periodically clearing the COP
counter.
4.2 Functional Description
CGMXCLK
12-BIT COP PRESCALER
STOP INSTRUCTION
INTERNAL RESET SOURCES
RESET VECTOR FETCH
COPCTL WRITE
COPD FROM CONFIG
RESET
COPCTL WRITE
COPRS FROM CONFIG
6-BIT COP COUNTER
CLEAR COP
COUNTER
RESET
RESET STATUS
REGISTER
Figure 4-1. COP Block Diagram
MC68HC908RF2 — Rev. 4.0
MOTOROLA
Computer Operating Properly Module (COP)
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Data Sheet
47