mc68hc908jw32 Freescale Semiconductor, Inc, mc68hc908jw32 Datasheet - Page 195
mc68hc908jw32
Manufacturer Part Number
mc68hc908jw32
Description
M68hc08 Microcontrollers Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908JW32.pdf
(226 pages)
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Chapter 16
Computer Operating Properly (COP)
16.1 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 clearing the COP counter periodically. The COP module can be disabled through the COPD bit in the
CONFIG register.
16.2 Functional Description
Figure 16-1
Freescale Semiconductor
INTERNAL RESET SOURCES
(COPRS FROM CONFIG)
RESET VECTOR FETCH
COPD (FROM CONFIG)
shows the structure of the COP module.
COPEN (FROM SIM)
COPCTL WRITE
COPCTL WRITE
COP RATE SEL
CGMRCLK
RESET
(1)
Figure 16-1. COP Block Diagram
COP MODULE
MC68HC908JW32 Data Sheet, Rev. 5
COP CLOCK
12-BIT SIM COUNTER
COP COUNTER
6-BIT COP COUNTER
CLEAR
SIM
RESET STATUS REGISTER
SIM RESET CIRCUIT
195
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