Question

ret instruction is used for _________

(a) determining the end of the program

(b) for returning back from the subroutine to the main program

(c) for transferring data from one place to another

(d) none of the mentioned

The question was asked in semester exam.

I want to ask this question from Functions and Subroutine topic in division MSP430 Microcontroller of Microcontroller

Answer 1

Right answer is (b) for returning back from the subroutine to the main program

The best explanation: Ret instruction is basically used for returning back from a subroutine. It actually pops the top address from the stack and moves that address to its PC, so that it now returns to the main program and continue the execution normally.