What is interrupt latency?

It is an important question that is asked by the interviewer to test the understanding of Interrupt. Basically, interrupt latency is the number of clock cycles that are taken by the processor to respond to an interrupt request. This clock cycle number is count between the assertions of the interrupt request and the first instruction of the interrupt handler.

Interrupt Latency on the Cortex-M processor family

The Cortex-M processors have very low interrupt latency. In the below table, I have mentioned, Interrupt latency of Cortex-M processors with zero wait state memory systems.