MC908QT1 FREESCALE [Freescale Semiconductor, Inc], MC908QT1 Datasheet - Page 57

• Manufacturer Part Number: MC908QT1
• Description: Microcontrollers
• Manufacturer: FREESCALE [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
COP DISABLE (COPD FROM CONFIG1)
INTERNAL RESET SOURCES
(COPRS FROM CONFIG1)
COP RATE SELECT
STOP INSTRUCTION
COPEN (FROM SIM)
COPCTL WRITE
COPCTL WRITE
BUSCLKX4
RESET
MC68HC908QY/QT Family Data Sheet, Rev. 5
Figure 6-1. COP Block Diagram
COP CLOCK
12-BIT SIM COUNTER
COP COUNTER
6-BIT COP COUNTER
CLEAR
RESET STATUS REGISTER
RESET CIRCUIT
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