![]() ![]() Transfer of memory also occurs when the program counter is updated with the starting address of the interrupt service routine. Still, the saving and restoring of information from memory and registers which involve memory transfer increase the execution time of the program. The modern processor store the minimum information that will be needed by the processor to resume the execution of the suspended program. ![]() If the processor finds the pending interrupts, it suspends the execution of the current program by saving the address of the next instruction that has to be executed and it updates the program counter with the starting address of the interrupt service routine to service the occurred interrupt.Īfter the interrupt is serviced completely the processor resumes the execution of the program it has suspended.Īs we know to service the occurred to interrupt the processor suspends the execution of the current program and save the details of the program to maintain the integrity of the program execution. If no interrupt is pending then the processor proceeds to fetch the next instruction in the sequence. But, to accommodate the occurrence of the interrupts while normal processing of the instructions, the interrupt cycle is added to the normal instruction cycle as shown in the figure below.Īfter the execution of the current instruction, the processor verifies the interrupt signal to check whether any interrupt is pending. The software interrupts are the interrupts that occur when a condition is met or a system call occurs.Ī normal instruction cycle starts with the instruction fetch and execute. ![]()
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March 2023
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