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MC908QT4MPE Datasheet(PDF) 57 Page - Freescale Semiconductor, Inc

Part # MC908QT4MPE
Description  Microcontrollers
PDF  184 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC908QT4MPE Datasheet(HTML) 57 Page - Freescale Semiconductor, Inc

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MC68HC908QY/QT Family Data Sheet, Rev. 5
Freescale Semiconductor
57
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
Figure 6-1. COP Block Diagram
COPCTL WRITE
BUSCLKX4
RESET CIRCUIT
RESET STATUS REGISTER
INTERNAL RESET SOURCES
12-BIT SIM COUNTER
6-BIT COP COUNTER
COP DISABLE (COPD FROM CONFIG1)
RESET
COPCTL WRITE
CLEAR
COPEN (FROM SIM)
COP COUNTER
COP CLOCK
STOP INSTRUCTION
COP RATE SELECT
(COPRS FROM CONFIG1)



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