mc68hc908qb4 Freescale Semiconductor, Inc, mc68hc908qb4 Datasheet - Page 61

• Manufacturer Part Number: mc68hc908qb4
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 6
Computer Operating Properly (COP)
6.1 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
configuration 1 (CONFIG1) register.
6.2 Functional Description
Freescale Semiconductor
1. See
INTERNAL RESET SOURCES
(COPRS FROM CONFIG1)
COPD (FROM CONFIG1)
Chapter 14 System Integration Module (SIM)
STOP INSTRUCTION
COPEN (FROM SIM)
COP RATE SELECT
COPCTL WRITE
COPCTL WRITE
BUSCLKX4
RESET
(1)
Figure 6-1. COP Block Diagram
COP CLOCK
MC68HC908QB8 Data Sheet, Rev. 2
12-BIT SIM COUNTER
COP COUNTER
CLEAR
6-BIT COP COUNTER
COP MODULE
SIM MODULE
for more details.
RESET STATUS REGISTER
SIM RESET CIRCUIT
61