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MC68HC908GR16A Datasheet(PDF) 79 Page - Freescale Semiconductor, Inc |
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MC68HC908GR16A Datasheet(HTML) 79 Page - Freescale Semiconductor, Inc |
79 / 270 page MC68HC908GR16A Data Sheet, Rev. 1.0 Freescale Semiconductor 79 Chapter 6 Computer Operating Properly (COP) Module 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 CONFIG register. 6.2 Functional Description Figure 6-1 shows the structure of the COP module. Figure 6-1. COP Block Diagram COPCTL WRITE BUSCLKX4 RESET VECTOR FETCH SIM RESET CIRCUIT RESET STATUS REGISTER INTERNAL RESET SOURCES(1) SIM MODULE 12-BIT SIM COUNTER COPD (FROM CONFIG1) RESET COPCTL WRITE CLEAR COP MODULE COPEN (FROM SIM) 1. See Chapter 15 System Integration Module (SIM) for more details. COP CLOCK COP RATE SELECT (COPRS FROM CONFIG1) 6-BIT COP COUNTER COP COUNTER |
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