Microprocessor
The interrupt facility is provided in microprocessor to

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

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Microprocessor
The stack pointer register in a microprocessor

 keeps the address of the next instruction to be fetched
 counts the number of programs being executing on the microprocessor
 holds the address of the top of the stack
 counts the number of instructions being executing on the microprocessor

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