What do you mean by Interrupt?
1) An interrupt is a subroutine called, initiated by the external device through hardware (hardware interrupt) or microprocessor itself (software interrupt).
2) An interrupt can also be viewed as a signal, which suspends the normal sequence of the microprocessor and then microprocessor gives service to that device which has given the signal. After completing the service, the microprocessor again returns to the main program.
3) A microprocessor is connected to different peripheral devices. To communicate with these devices, microprocessor 8085 uses interrupt method.
4) An interrupt is an input signal, which transfers control to specific routine known as Interrupt Service Routine (ISR). After executing ISR, control is again transferred to the main program.