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DSP56857 Datasheet(PDF) 522 Page - Freescale Semiconductor, Inc |
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DSP56857 Datasheet(HTML) 522 Page - Freescale Semiconductor, Inc |
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522 / 662 page  Application: Date: Programmer: Sheet C 5685X Digital Signal Controller User Manual, Rev. 4 B-20 Freescale Semiconductor COP Counter Register (COPCTR) $1FFFD0 + $2 Bits 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Read COUNT Write SERVICE Reset 111 111111 111111 1 3 of 3 COP COP Counter Register (COPCTR) Bits Name Description 15 - 0 COPCTR COP Counter(Count) This is the current value of the COP counter as it counts down from the timeout value to zero. A reset is issued when this count reaches zero. 15 - 0 COPCTR COP Counter (Service) When enabled, the COP requires a service sequence be performed periodically in order to clear the COP counter and prevent a reset from being issued. This routine consists of writing $5555 to the COPCTR followed by writing $AAAA before the timeout period expires. The writes to COPCTR must be performed in the correct order, but any number of other instructions, and writes to other registers, may be executed between the two writes. |
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