Interrupts - computer architecture, Computer Engineering

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Interrupts

Interrupt-request line

o Interrupt-acknowledge signal

o Interrupt-request signal

Interrupt-service routine

o May have no relationship to program being executed at time of interrupt

o Similar to subroutine

Interrupt latency
Program info must be saved

Transfer of control through the use of interrupts

Interrupts

Examples of the interrupts:

I/O device request, OS call, page fault
power failing, arithmetic overflow
Invalid opcode, breakpoint, protection violation

Interrupts (aka faults, exceptions, traps) frequently require

connecting return address
surprise jump (to vectored address)
state change ( for example, to kernel mode)
saving of PSW (including CCs)

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