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What does the zero flag (Z) indicate in ARM conditional branching?

easy📝 Conceptual Q11 of 15
ARM Architecture - Control Flow Instructions
What does the zero flag (Z) indicate in ARM conditional branching?
AThe processor is in privileged mode
BThe previous operation caused an overflow
CThe previous operation resulted in zero
DThe previous operation resulted in a negative value
Step-by-Step Solution
Solution:

  1. Step 1: Understand the zero flag meaning

    The zero flag (Z) is set when the result of the last operation is exactly zero.

  2. Step 2: Relate zero flag to conditional branching

    Conditional branches use the zero flag to decide if the program should jump when a zero result occurs.

  3. Final Answer:

    The previous operation resulted in zero -> Option C

  4. Quick Check:

    Zero flag means result is zero [OK]
Quick Trick: Zero flag means result is zero, check it first [OK]
Common Mistakes:
  • Confusing zero flag with negative flag
  • Thinking zero flag means overflow
  • Assuming zero flag indicates processor mode

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