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
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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