Microprocessor
An I/O processor controls the flow of information between

Cache memory and I/O devices
Cache and main memory
Two I/O devices
Main memory and I/O devices

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Microprocessor
The interrupt facility is provided in microprocessor to

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

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