MC68HC908GT16 Datasheet, PDF (154/412 Pages) Motorola, Inc – Microcontrollers

Computer Operating Properly (COP) Module
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.
COPCLK
12-BIT COP PRESCALER
RESET CIRCUIT
RESET STATUS REGISTER
STOP INSTRUCTION
INTERNAL RESET SOURCES
RESET VECTOR FETCH
COPCTL WRITE
COPEN (FROM SIM)
COP DISABLE
(FROM CONFIG)
RESET
COPCTL WRITE
COP RATE SEL
(FROM CONFIG)
COP CLOCK
COP MODULE
6-BIT COP COUNTER
CLEAR
COP COUNTER
Figure 9-1. COP Block Diagram
Technical Data
154
MC68HC908GT16 • MC68HC908GT8 — Rev. 2
Computer Operating Properly (COP) Module
MOTOROLA