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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Microprocessor
Ready pin of microprocessor is used

 to indicate that microprocessor is ready to receive inputs
 to introduce wait state
 to provide direct memory access
 to indicate that microprocessor is ready to receive outputs

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