Microprocessor
The relation among IC (Instruction Cycle), FC (Fetch cycle) and EC (Execute Cycle) is

 IC = FC + 2EC
 EC = IC + FC
 IC = FC - EC
 IC = FC + EC

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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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