ARM Architecture - Exception and Interrupt Model
What will happen if the following ARM instructions are executed in order?
CPSID i CPSIE i
What will happen if the following ARM instructions are executed in order?
medium📝 Analysis Q13 of 15
Step-by-Step Solution
Solution:
Step 1: Analyze first instruction CPSID i
This disables interrupts, so after this instruction interrupts are off.Step 2: Analyze second instruction CPSIE i
This enables interrupts, so after this instruction interrupts are on again.Final Answer:
Interrupts are first disabled then enabled -> Option CQuick Check:
CPSID i then CPSIE i = disable then enable interrupts [OK]
Quick Trick: CPSID disables, CPSIE enables interrupts in sequence [OK]
Common Mistakes:
- Assuming interrupts stay disabled after CPSIE i
- Thinking processor resets after these instructions
- Confusing the order of enable and disable
Master "Exception and Interrupt Model" in ARM Architecture
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