Question

When an interrupt is enabled, then where does the pointer moves immediately after this interrupt has occurred?

(a) to the next instruction which is to be executed

(b) to the first instruction of ISR

(c) to a fixed location in memory called interrupt vector table

(d) to the end of the program

I had been asked this question in an internship interview.

Enquiry is from Interrupt Programming topic in section 8051 Microcontroller of Microcontroller

Answer 1

Correct answer is (c) to a fixed location in memory called interrupt vector table

To explain: When an interrupt occurs, then it jumps to a fixed memory location in memory called the interrupt vector table that holds the address of the Interrupt Service Routine.