•An interrupt isthe occurrence of an event that causes a temporary suspension of a program while the condition is serviced by another program.
•It is like a
sub-routine. CPU cannot execute more than one instruction at a time; but it can temporarily
suspend execution of one
program, execute another, then return to the first program.
•Difference in interrupt
and subroutine is that in an interrupt-driven
system, the interruption occur asynchronously with the main
program, and it is not known
when the main program will be interrupted.
•Program that deals
with the interrupt is called as ISR(Interrupt Service Routine).