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
 None
 00000001
 00000000

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Microprocessor
The stack pointer register in a microprocessor

 keeps the address of the next instruction to be fetched
 counts the number of instructions being executing on the microprocessor
 counts the number of programs being executing on the microprocessor
 holds the address of the top of the stack

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