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Which of the following is the correct syntax to execute the WFI instruction in ARM assembly?

easy📝 Factual Q12 of 15
ARM Architecture - Power Modes
Which of the following is the correct syntax to execute the WFI instruction in ARM assembly?
AWFI()
BWFI
Cwfi
Dwait_for_interrupt
Step-by-Step Solution
Solution:

  1. Step 1: Recall ARM assembly instruction format

    ARM assembly instructions are usually uppercase and written without parentheses.

  2. Step 2: Identify the correct WFI syntax

    The correct instruction is simply WFI in uppercase letters without parentheses or underscores.

  3. Final Answer:

    WFI -> Option B

  4. Quick Check:

    ARM instructions are uppercase and simple: WFI [OK]
Quick Trick: ARM instructions are uppercase without parentheses [OK]
Common Mistakes:
  • Adding parentheses like a function call
  • Using lowercase which is not standard assembly syntax
  • Using descriptive names instead of official instruction

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