General Sequence Followed When Interrupts Occur By An External Device
- Interrupt request(IRQ) signal is sent by the device to the processor.
- If the interrupt line is enabled the following sequence of events occur in the system, else the interrupt is ignored. The processor completes its present instruction (if any) and pays attention to the IRQ.
- It stores the address of the next location and content of status register to the stack
- It informs the device that its request has been granted and in response the device de-activates its IRQ.
- Using some suitable technique the processor loads its program counter(PC) with address of the ISR.
- With return statement occurring at the end of the ISR all stored content is loaded back into the respective registers and the processor resumes its suspended program*.
-
- In preemptive scheduled operating systems the processor's control is given to process scheduler instead of the interrupted process.
Read more about this topic: Interrupt Handler
Famous quotes containing the words general, sequence, interrupts, occur, external and/or device:
“As a general rule, do not kick the shins of the opposite gentleman under the table, if personally unaquainted with him; your pleasantry is liable to be misunderstood—a circumstance at all times unpleasant.”
—Lewis Carroll [Charles Lutwidge Dodgson] (1832–1898)
“It isn’t that you subordinate your ideas to the force of the facts in autobiography but that you construct a sequence of stories to bind up the facts with a persuasive hypothesis that unravels your history’s meaning.”
—Philip Roth (b. 1933)
“An entertainment is something which distracts us or diverts us from the routine of daily life. It makes us for the time being forget our cares and worries; it interrupts our conscious thoughts and habits, rests our nerves and minds, though it may incidentally exhaust our bodies. Art, on the other hand, though it may divert us from the normal routine of our existence, causes us in some way or other to become conscious of that existence.”
—Sir Herbert Read (1893–1968)
“When great changes occur in history, when great principles are involved, as a rule the majority are wrong.”
—Eugene V. Debs (1855–1926)
“When a person hasn’t in him that which is higher and stronger than all external influences, it is enough for him to catch a good cold in order to lose his equilibrium and begin to see an owl in every bird, to hear a dog’s bark in every sound.”
—Anton Pavlovich Chekhov (1860–1904)
“It is my hope to be able to prove that television is the greatest step forward we have yet made in the preservation of humanity. It will make of this Earth the paradise we have all envisioned, but have never seen.”
—Joseph O’Donnell. Clifford Sanforth. Professor James Houghland, Murder by Television, just before he demonstrates his new television device (1935)