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Why is it important to enable the peripheral clock before accessing peripheral registers in ARM microcontrollers?

hard📝 Conceptual Q10 of 15
ARM Architecture - Bus Architecture
Why is it important to enable the peripheral clock before accessing peripheral registers in ARM microcontrollers?
ABecause clock enable configures the peripheral pins automatically
BBecause enabling clock resets the peripheral registers
CBecause peripherals do not function without their clock signal
DBecause clock enable disables interrupts for the peripheral
Step-by-Step Solution
Solution:

  1. Step 1: Understand peripheral operation dependency

    Peripherals require a clock signal to operate and respond to register access.

  2. Step 2: Effect of not enabling clock

    Without clock, peripheral registers are not functional and accesses may fail or hang.

  3. Final Answer:

    Because peripherals do not function without their clock signal -> Option C

  4. Quick Check:

    Peripheral needs clock to work [OK]
Quick Trick: Peripheral registers need clock to respond [OK]
Common Mistakes:
  • Thinking clock enable resets registers
  • Assuming clock enable configures pins
  • Confusing clock enable with interrupt control

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