ARM Architecture - Power Modes
Which of the following is the correct way to write the
WFI instruction in ARM assembly?Which of the following is the correct way to write the WFI instruction in ARM assembly?
easy📝 Factual Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Understand ARM assembly syntax
ARM assembly instructions are case-insensitive but typically written in uppercase without parentheses or semicolons.Step 2: Analyze each option
WFI is the standard syntax for the WFI instruction.
wfi() uses parentheses which are invalid.
WAIT FOR INTERRUPT is a descriptive phrase, not assembly.
wfi; uses a semicolon which is not part of the instruction syntax.Final Answer:
WFI -> Option BQuick Check:
Correct syntax is just the instruction name in uppercase [OK]
Quick Trick: Use uppercase instruction without parentheses or semicolons [OK]
Common Mistakes:
- Adding parentheses after WFI
- Using descriptive phrases instead of instructions
- Appending semicolons to instructions
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