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It is defined as maximum permissible interrupt latency plus execution interval of the ISR.
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A CPU generally handles an interrupt by executing an interrupt service routine?
By checking the interrupt register at fixed time intervals
What happens when interrupts comes?
Interrupt handler is responsible for following functions:- Determine the interrupt source. Determine the service routine to serve the interrupt source.
What is a TrapHandler?
A trap handler, also called an interrupt handler or interrupt service routine (ISR) is a program that executes when predefined events occur in a computer. There are software and hardware interrupts. An interrupt causes the computer's processor to stop running its current task and immediately run the trap handler to service the interrupt.
What is nested interrupt?
I believe a nested interrupt, is where an interrupt is allowed to occur (and thus is handled) during an already occurring Interupt service ruotine. I.E. First interrupt occurs ISR1 begins second Interrupt occurs ISR2 begins ISR2 Finishes ISR1 continues from where left off ISR1 finishes
What is the difference between polling and vector interrupt service routine?
polling interrupt is alternative to the vector interrupt , it requires that the interrupt handler poll or send a signal to each device in turn in order to find out which one is sent the interrupt request.....
What is interrupt acknowledge?
Interrupt acknowledge is the process of acknowledging a hardware interrupt, obtaining an interrupt vector address, and initiating the interrupt service routine in software. The INTA- (Interrupt Acknowledge) pin has the same timing as RD-, and external hardware is expected to provide an opcode in response to it. In the case of TRAP, RST7.5, RST6.5, and RST5.5, there is no specific interrupt acknowledge cycle like there is for INTR, but everything else is the same.
What happens when processor is attending an interrupt if it gets another interrupt?
The response to another interrupt request during servicing of an interrupt depends on the setting of the interrupt enable flag and/or the interrupt mask. If the interrupt service routine is thread safe, it will process correctly. More probably, problems will arise so the proper procedure is to either set the interrupt mask (8085) to not allow this or lower priority interrupts before reenabling interrupt, or to leave interrupts disabled until this iteration is complete. If interrupts are disabled or masked, a subsequent interrupt will be posted but not processed until the first is completed.
What is the process of a hardware device requesting service from the CPU?
This is known as an 'interrupt'. There is an extensive article explaining interrupts in detail here: http://en.wikipedia.org/wiki/Interrupt
What is interrupt handler service?
They are the ones that reports errors when compiling codes in an programming language.
What part that holds the programs application data and interrupt service routines when they are being executed?
When programs' application data and interrupt service routines are being executed they are held in a computer's main memory. The largest component of main memory is RAM.
What is a High Level Interrupt Service Routine?
Please go through the Link: http://gohelrakesh.wordpress.com/2008/09/28/nucleus-interrupt-handling/ - Regards, Duraimurugan Arjunan
What is an interrupt How are multiple interrupts dealt with?
An interrupt is a request to execute different code, initiated usually by a hardware condition such as data-ready or operation-complete, but also sometimes initiated by the running program. The processor saves its immediate state, IP and Flags, on the stack and loads a new IP value, effectively doing a CALL sequence to some interrupt service routine. The routine does whatever processing is required, and returns, restoring the running program. Under normal conditions, the interrupt response sequence disables further interrupts, so that recursive entry does not occur. The service routine reenables interrupts just before returning, so that pending or further interrupts can be processed. If multiple interrupt levels are to be supported, such as in the 8085, the interrupt service routine can set the interrupt mask, blocking the level in progress, and then reenable interrupts. This way, a second interrupt on a higher level can be processed while the first interrupt is being processed. On return, the lower level interrupt disables interrupts, restores the mask, and then reenables interrupts prior to return.
