During Interrupt-Driven Io Cycle What Causes an Interrupt?

The CPU has an interrupt-request line that is sensed after every instruction. A device's controller raises an interrupt by asserting a signal on the interrupt request line. The CPU then performs a state save, and transfers control to the interrupt handler routine at a fixed address in memory.

What causes an interrupt?

A software interrupt may be intentionally caused by executing a special instruction which, by design, invokes an interrupt when executed. ... Software interrupts may also be unexpectedly triggered by program execution errors. These interrupts typically are called traps or exceptions.

What is interrupt initiated IO?

Interrupt Initiated I/O. Data transfer is initiated by the means of instructions stored in the computer program. Whenever there is a request for I/O transfer the instructions are executed from the program. The I/O transfer is initiated by the interrupt command issued to the CPU.