MC68HC908KX8 Datasheet, PDF (160/310 Pages) Motorola, Inc – Microcontrollers

Computer Operating Properly Module (COP)
11.2 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 to recover from a runaway code. Periodically clearing the
COP counter will prevent a COP reset from occurring. The COP module
can be disabled through the COPD bit in the configuration (CONFIG)
register.
11.3 Block Diagram
CGMXCLK
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)
SIM MODULE
COP CLOCK
COP MODULE
6-BIT COP COUNTER
CLEAR
COP COUNTER
Figure 11-1. COP Block Diagram
Technical Data
160
MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 — Rev. 1.0
Computer Operating Properly Module (COP)
MOTOROLA