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Instruction cycle is basically related with the execution of the instruction. A program residing in the memory unit of a computer consists of sequence of instructions. In the basic computer, each instruction cycle consists of following phases:
Instruction Cycle with interrupts:
For this, we have one flip-flop R. This flip flop R will decide whether it is interrupt or it is normal execution of our program.
When R = 0:
When R = 1
If R is set to 1 then the interrupt is occurred. Now in this case, we store return address in the location O (free location) i.e. return address always in PC. so it is stored from PC to memory location pointed by zero. After that we jump branch to location 1. Finally we set IEN to 0 and R to 0
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