Microprocessor
The interrupt facility is provided in microprocessor to

 change the sequence of the instructions being executed
 stop the microprocessor when it starts malfunctioning
 stop the microprocessor when desired
 keep a control on the working of the microprocessor

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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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