Microprocessor
The first machine cycle of an instruction is always

 A memory write cycle
 An I/O read cycle
 A memory read cycle
 A fetch cycle

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Microprocessor
Program counter in a digital computer

 Counts the number of times a subroutine is called.
 Points the memory address of the next instruction to be fetched.
 Counts the number of times the loops are executed.
 Counts the numbers of programs run in the machine.

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