ARM Architecture - Exception and Interrupt Model
Identify the error in this ARM assembly snippet meant to disable interrupts:
CPSIE i
Identify the error in this ARM assembly snippet meant to disable interrupts:
medium📝 Analysis Q14 of 15
Step-by-Step Solution
Solution:
Step 1: Understand the instruction CPSIE i
CPSIE iis used to enable interrupts, not disable them.Step 2: Compare with correct disable instruction
The correct instruction to disable interrupts isCPSID i.Final Answer:
It enables interrupts instead of disabling them -> Option BQuick Check:
CPSIE i enables, not disables interrupts [OK]
Quick Trick: CPSIE i enables interrupts; use CPSID i to disable [OK]
Common Mistakes:
- Confusing CPSIE i as disabling interrupts
- Thinking CPSIE i causes syntax error
- Believing CPSIE i resets processor
Master "Exception and Interrupt Model" in ARM Architecture
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