Microprocessor
The interrupt facility is provided in microprocessor to

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

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Microprocessor
Ready pin of microprocessor is used

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

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