Microprocessor
The microprocessor may be made to exit from HALT state by asserting

 A or B or HOLD line
 any of the five interrupt lines
 READY line
 RESTART

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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.
 Points the memory address of the next instruction to be fetched.
 Counts the number of times the loops are executed.

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