Question

Which interrupts allows a protected state?

(a) internal interrupt

(b) external interrupt

(c) software interrupt

(d) both internal and external interrupts

This question was addressed to me during an internship interview.

I'm obligated to ask this question of Sources of Interrupts in section Interrupts and Exceptions of Embedded Systems

Answer 1

Correct answer is (c) software interrupt

Easy explanation: The software interrupt can change the processor into a protected state by changing the program flow.