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Which of the following instructions cannot be used to switch to user mode?

A. EORI #$FFFF, SR
B. MOVE #0, SR
C. ORI #0, SR
D. ANDI #0, SR
E. EORI #$FF00, SR
F. MOVE #$0480, SR

Answer :

The instruction 3) ORI #0, SR cannot be used to switch to user mode because it does not modify the status register bits responsible for mode switching.

When handling processor modes and register operations, only certain instructions can switch a processor to user mode.

The instructions provided can alter the status register (SR), which contains the mode bits. Here's the detailed explanation:

  • EORI #$FFFF, SR: This instruction uses the exclusive OR operation to modify the SR, including user mode bits.
  • MOVE #0, SR: This moves the immediate value 0 into the SR, which could switch the mode.
  • ORI #0, SR: This instruction performs an OR operation, not changing any bits including mode bits.
  • ANDI #0, SR: This clears all bits in the SR, affecting the mode bits as well.
  • EORI #$FF00, SR: Using EORI changes specific bits in the SR.
  • MOVE #$0480, SR: This could switch the processor mode by setting specific bits directly.

Complete question:-

Which of the following instructions can not be used to switch to the user mode?

1) EORI#$FFFF, SR

2) MOVE #0, SR

3) ORI #0, SR

4) ANDI #0, SR

5) EORI#$FF00, SR

6) MOVE #$0480, SR

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