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MC68HC908GR4MP Datasheet(PDF) 93 Page - Freescale Semiconductor, Inc |
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MC68HC908GR4MP Datasheet(HTML) 93 Page - Freescale Semiconductor, Inc |
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93 / 286 page  MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7 Freescale Semiconductor 93 Chapter 9 Computer Operating Properly (COP) 9.1 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. 9.2 Functional Description Figure 9-1 shows the structure of the COP module. Figure 9-1. COP Block Diagram COPCTL WRITE CGMXCLK RESET VECTOR FETCH RESET CIRCUIT RESET STATUS REGISTER INTERNAL RESET SOURCES 12-BIT COP PRESCALER 6-BIT COP COUNTER COP DISABLE RESET COPCTL WRITE CLEAR COP MODULE COPEN (FROM SIM) COP COUNTER COP CLOCK STOP INSTRUCTION (FROM CONFIG) COP RATE SEL (FROM CONFIG) |
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