1)What is an interrupt? 2)Explain briefly giving an example...

Answer by vasu raina
Submitted on 1/11/2005
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A specific sequence of events takes place when an interrupt is processed. You should write the ISR and IST for your device driver with the following sequence of events in mind: When an interrupt occurs, the microprocessor jumps to the kernel exception handler. The exception handler disables all equal and lower-priority interrupts at the microprocessor and calls the appropriate ISR for the physical interrupt line. The ISR returns a logical interrupt, in the form of an interrupt identifier, to the interrupt handler and typically masks the board-level device interrupt. The interrupt handler re-enables all interrupts at the microprocessor, with the exception of the current interrupt, which is left masked at the board, and signals the appropriate IST event. The IST is scheduled and services the hardware and finishes processing the interrupt.

Answer by Malawi chap
Submitted on 4/11/2006
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An interrupt is a signal to the processor telling it that some event has occurred and it requires its attention. Interrupts came from several sources with some coming from input/output devices and others from internal programs. There are two types of Interrupts. Maskable and Non maskable. Masked interrupts are those that can be masked out on condition. while Non masked interrupts are the ones that can not be ignored. These are very important interrupts such as pressing a reset button. 2. When an interrupt occurs, for instance a keyboard key has been pressed, a signal is sent to the processor that a key on the keyboard has been pressed. The processor temporarily suspends execution of current instruction and calls a an interrupts service routine to handle that. After the interrupt has been handled the ISR is dismissed and the processor send its control back to continue with the execution where it left.

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Question by vidusha
Submitted on 4/27/2004
Related FAQ: 8051 microcontroller FAQ
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1)What is an interrupt? 2)Explain briefly giving an example how an interupt is serviced?

Answer by FBI
Submitted on 3/10/2005
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Simply Interrupt means request for service. Ex: By pressing the hot keys ctrl+alt+del suddenly the processor turns into the interrupt which is specified above by suspending the work which is currently doing. After the interruption is finished the work continues from the position which is leaved previously.

Answer by thedumbone
Submitted on 5/22/2005
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A signal informing a program that an event has occurred. When a program receives an interrupt signal, it takes a specified action (which can be to ignore the signal). Interrupt signals can cause a program to suspend itself temporarily to service the interrupt. Interrupt signals can come from a variety of sources. For example, every keystroke generates an interrupt signal. Interrupts can also be generated by other devices, such as a printer, to indicate that some event has occurred. These are called hardware interrupts. Interrupt signals initiated by programs are called software interrupts. A software interrupt is also called a trap or an exception.

Answer by esrever
Submitted on 1/11/2006
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A signal informing a program that an event has occurred. When a program receives an interrupt signal, it takes a specified action (which can be to ignore the signal). Interrupt signals can cause a program to suspend itself temporarily to service the interrupt. http://exasoft.co.nr

Answer by jhjghjgh
Submitted on 10/5/2006
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Answer by MALAWI Boy
Submitted on 10/24/2006
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An interrupt is a signal either from hardware or from a program that interrupts the normal processing of the CPU alerting it that something has happened and requires its urgent attention. When an interrupt occurs the computer suspends what it was executing and jumps to call the interrupt service routine to handle the interrupt. It saves the current state, including the registers on the stack so that after handling the interrupt it can restored the state and registers and resume execution where it stopped.

Answer by Demetris
Submitted on 4/15/2007
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An interrupt is an event that stops the current process in the CPU so that the CPU can attend to the task needing completion because of the event

Answer by Skhu
Submitted on 6/5/2007
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A hardware or software generated signal which is caused by a change in hardware state.

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