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What is the main purpose of the exception entry sequence in ARM architecture?

easy📝 Conceptual Q11 of 15
ARM Architecture - Exception and Interrupt Model
What is the main purpose of the exception entry sequence in ARM architecture?
ATo increase the processor clock speed temporarily
BTo execute normal instructions without interruption
CTo save the current processor state and switch to exception mode
DTo reset the processor completely
Step-by-Step Solution
Solution:

  1. Step 1: Understand what happens during exception entry

    When an exception occurs, the processor saves its current state to avoid losing information.

  2. Step 2: Recognize the mode switch

    The processor switches to a special mode to handle the exception safely.

  3. Final Answer:

    To save the current processor state and switch to exception mode -> Option C

  4. Quick Check:

    Exception entry = Save state + switch mode [OK]
Quick Trick: Exception entry always saves state and switches mode [OK]
Common Mistakes:
  • Thinking exception entry resets the processor
  • Confusing exception entry with normal instruction execution
  • Assuming clock speed changes during exception

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