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Vectored interrupt

Processing technique in computer science

In computer science, a vectored interrupt is a processing technique in which the interrupting device directs the processor to the appropriate interrupt service routine. This is in contrast to a polled interrupt system, in which a single interrupt service routine must determine the source of the interrupt by checking all potential interrupt sources, a slow and relatively laborious process.

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Implementation

Vectored interrupts are achieved by assigning each interrupting device a unique code, typically four to eight bits in length.¹ When a device interrupts, it sends its unique code over the data bus to the processor, telling the processor which interrupt service routine to execute.

References

Hamacher, Carl (2002). "INPUT/OUTPUT Organization". Computer Organization (5th ed.). McGraw Hill. p. 214. ISBN 0072320869. 0072320869 ↩