Editing Interrupt (section)

===Edge-triggered===
An ''edge-triggered interrupt'' is an interrupt signaled by a [[signal edge|level transition]] on the interrupt line, either a falling edge (high to low) or a rising edge (low to high). A device wishing to signal an interrupt drives a pulse onto the line and then releases the line to its inactive state. 

The important part of edge triggering is that the signal must transition to trigger the interrupt; for example, if the transition was high-low, there would only be one falling edge interrupt triggered, and the continued low level would not trigger a further interrupt. The signal must return to the high level and fall again in order to trigger a further interrupt. This contrasts with a level trigger where the low level would continue to create interrupts (if they are enabled) until the signal returns to its high level.

Computers with edge-triggered interrupts may include an ''interrupt register'' that retains the status of pending interrupts. Systems with interrupt registers generally have interrupt mask registers as well.