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:
“[The Republican Party] consists of those who, believing in the doctrine that mankind are capable of governing themselves and hating hereditary power as an insult to the reason and an outrage to the rights of men, are naturally offended at every public measure that does not appeal to the understanding and to the general interest of the community.”
—James Madison (1751–1836)
“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)
“I defied nothing at all. I ignored the law because I didn’t know it existed. It didn’t occur to me that anyone would want to curb my inspiration.”
—Margaret Anderson (1886–1973)
“Nature predominates over the human will in all works of even the fine arts, in all that respects their material and external circumstances. Nature paints the best part of the picture, carves the best of the statue, builds the best part of the house, and speaks the best part of the oration.”
—Ralph Waldo Emerson (1803–1882)
“Syntax is the study of the principles and processes by which sentences are constructed in particular languages. Syntactic investigation of a given language has as its goal the construction of a grammar that can be viewed as a device of some sort for producing the sentences of the language under analysis.”
—Noam Chomsky (b. 1928)