12 Facts About Hardware interrupt

In digital computers, an Hardware interrupt is a request for the processor to Hardware interrupt currently executing code, so that the event can be processed in a timely manner.

Consequently, all incoming hardware interrupt signals are conditioned by synchronizing them to the processor clock, and acted upon only at instruction execution boundaries.

Each Hardware interrupt signal is associated with a bit in the mask register.

On some systems, the Hardware interrupt is enabled when the bit is set, and disabled when the bit is clear.

Spurious interrupt is a hardware interrupt for which no source can be found.

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The result is the processor will think another Hardware interrupt is pending, since the voltage at its Hardware interrupt request input will be not high or low enough to establish an unambiguous internal logic 1 or logic 0.

The apparent Hardware interrupt will have no identifiable source, hence the "spurious" moniker.

Software Hardware interrupt is requested by the processor itself upon executing particular instructions or when certain conditions are met.

Level-triggered Hardware interrupt is requested by holding the Hardware interrupt signal at its particular active logic level.

The important part of edge triggering is that if the Hardware interrupt was triggered by a high to low edge transition, that if the level remained low it would not trigger a further Hardware interrupt.

However, it is easy for an edge-triggered interrupt to be missed - for example, when interrupts are masked for a period - and unless there is some type of hardware latch that records the event it is impossible to recover.

Shortage of Hardware interrupt lines is a problem in older system designs where the Hardware interrupt lines are distinct physical conductors.