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What does the ARM instruction CPSID i do?

easy📝 Conceptual Q1 of 15
ARM Architecture - Exception and Interrupt Model
What does the ARM instruction CPSID i do?
AEnables FIQ interrupts
BEnables IRQ interrupts
CDisables FIQ interrupts
DDisables IRQ interrupts
Step-by-Step Solution
Solution:

  1. Step 1: Understand CPSID instruction

    The CPSID instruction disables interrupts in ARM. The 'i' specifies IRQ interrupts.

  2. Step 2: Identify the effect of CPSID i

    Since 'i' stands for IRQ, CPSID i disables IRQ interrupts.

  3. Final Answer:

    Disables IRQ interrupts -> Option D

  4. Quick Check:

    CPSID i disables IRQ interrupts [OK]
Quick Trick: CPSID i disables IRQ interrupts immediately [OK]
Common Mistakes:
  • Confusing IRQ with FIQ
  • Thinking CPSID enables interrupts
  • Mixing CPSID with CPSIE

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