[Solved] You want to save power by disabling the clock for unused periphe... Which of the following code snippets correctly disables the clock for Timer 3 (bit 1 in RCC->APB1ENR) without affecting other bits? | ARM Architecture

ARM Architecture - Bus Architecture

You want to save power by disabling the clock for unused peripherals. Which of the following code snippets correctly disables the clock for Timer 3 (bit 1 in RCC->APB1ENR) without affecting other bits?

ARCC->APB1ENR ^= (1 << 1);

BRCC->APB1ENR |= (1 << 1);

CRCC->APB1ENR &= ~(1 << 1);

DRCC->APB1ENR = 0;

Step-by-Step Solution

Solution:

Step 1: Understand disabling clock by clearing bit
Disabling a peripheral clock requires clearing its bit in the RCC register.
Step 2: Use bitwise AND with negation
Using AND with the negation of (1 << 1) clears bit 1 without changing other bits.
Step 3: Check other options
^= (1 << 1) toggles bit 1 (may enable or disable unpredictably), |= (1 << 1) sets bit 1 (enables clock), = 0 clears all bits (disables all clocks).
Final Answer:
RCC->APB1ENR &= ~(1 << 1); -> Option C
Quick Check:
Clear bit 1 with AND and negation to disable clock [OK]

Quick Trick: Clear bit with AND and negation to disable clock safely [OK]

Common Mistakes:

Using OR to disable instead of enable
Clearing all bits instead of one
Using XOR which toggles bits unpredictably

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More ARM Architecture Quizzes

Which of the following code snippets correctly disables the clock for Timer 3 (bit 1 in RCC->APB1ENR) without affecting other bits?

Step 1: Understand disabling clock by clearing bit

Step 2: Use bitwise AND with negation

Step 3: Check other options

Final Answer:

Quick Check:

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