Identify the error in the following code snippet that attempts to enable the clock for USART2:

medium📝 Analysis Q14 of 15

ARM Architecture - Bus Architecture

RCC->APB1ENR &= ~(1 << 17);

AIt disables the USART2 clock instead of enabling it

BIt enables the wrong peripheral clock

CThe bit shift value is incorrect for USART2

DThe syntax uses bitwise OR instead of AND

Step-by-Step Solution

Solution:

Step 1: Analyze the operation used
The code uses bitwise AND with the negation of (1 << 17), which clears bit 17.
Step 2: Understand the effect on USART2 clock
Clearing bit 17 disables the USART2 clock instead of enabling it.
Final Answer:
It disables the USART2 clock instead of enabling it -> Option A
Quick Check:
AND with negation clears bit = disables clock [OK]

Quick Trick: AND with negation clears bits, disables clock [OK]

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