Question

If two interrupts, of higher priority and lower priority occur simultaneously, then the service provided is for

(a) interrupt of lower priority

(b) interrupt of higher priority

(c) lower & higher priority interrupts

(d) none of the mentioned

The question was asked during an online exam.

This key question is from Interrupt Structure of 8051 in portion Microcontroller 8051 of Microprocessor

Answer 1

The correct option is (b) interrupt of higher priority

To explain I would say: If two interrupts, occur simultaneously, then the one with higher priority level and early polling sequence will receive service. The other one with lower priority may get lost there, as there is no mechanism for storing the interrupt requests.