1. A Top-Level View Of Computer Function And Interconnection
Chapter 3
Lecture 07
Faheem ahmad
Lecturer, CNET Dept.,
Jazan University, Jazan KSA
A Top-Level View Of Computer Function And Interconnection

2. Interrupt
Interrupt: It is a condition that cause microprocessor to temporarily work on the other task, and then again return to previous.
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3. Transfer of control via interrupts.
the processor and the oper­ating system are responsible for suspending the user program and then resuming it at the same point.
When the interrupt processing is completed, execution resumes .
Interrupt handler: determines the nature of the interrupt and performs whatever actions are needed
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4. Multiple interrupts
During execution of program if more then one interrupt is there then it is called as multiple interrupts.
A typical system can support several to several dozen interrupts, if there are multiple interrupts then how these interrupts are handled by the system. For this situation, system gives priority to the various interrupt. At the start of interrupt cycle, the high priority interrupt will be serviced first then rest services in turn.
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5. Multiple interrupts
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6. Classes of interrupt
1.Program: is caused by condition as result of instruction execution, e.g. divide by zero
2.Timer: Generated by timer within processor.
3.I/O: Generated by I/O to signal completion or error condition.
4.Hardware failure: Generated by failure such as power failure or memory parity error.

8. Interrupt cycle
Interrupt cycle: It means interrupt is added to instruction cycle. Processor checks for interrupt.
If there is no interrupt
CPU continues with fetch and execute process.
If there is Interrupt
suspend execution of current program
Save its context
Set program counter to start of interrupt

9. Instruction cycle with interrupts
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10. Thank you!!!