Microprocessor
Ready pin of microprocessor is used

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

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Microprocessor
Program counter in a digital computer

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

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