Hello I need help with this problem 1 What is the value in R

Hello, I need help with this problem.

1. What is the value in R4 after the following instructions are executed?

MOV.w #0, R4 ; R4 =

ADD.w #0x02, R4 ; R4 =

RLA.w R4 ; R4 =

RLA.w R4 ; R4 =

Thank you for your time!

Solution

Answer:

The value in R4 after the given instructions are executed is 0 i.e R4=0.

MOV.w #0, R4 ; R4 =0

ADD.w #0x02, R4 ; R4 =2

RLA.w R4 ; R4 =1

RLA.w R4 ; R4 =0

RLA instruction performs rotate left operation for the input which is in accumulator twice for the register R4 which gives the value 1 and 0 for the 3\'rd and 4\'th instructions respectively.