Microprocessor
Let the content of register C be 00000000 before the instruction DCR C is executed. The content of register C after the after the execution of this instruction will be

 11111111
 00000001
 None
 00000000

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Microprocessor
A high on RESET OUT signifies that

 all the registers and counters are being reset and this signal can be used to reset external support chip
 all the registers and counters are being reset
 all the registers of the CPU are being reset
 processing can begin when this signal goes high

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