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MC908QY2CDWE Datasheet(PDF) 57 Page - Freescale Semiconductor, Inc |
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MC908QY2CDWE Datasheet(HTML) 57 Page - Freescale Semiconductor, Inc |
57 / 168 page MC68HC908QY/QT Family Data Sheet, Rev. 6 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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