[Solved] Which of the following is the correct way to enable the SysTick timer in ARM Cortex-M processors? — Ans: Set the CTRL register's ENABLE bit to 1 | ARM Architecture

ARM Architecture - Exception and Interrupt Model

Which of the following is the correct way to enable the SysTick timer in ARM Cortex-M processors?

ASet the CTRL register's ENABLE bit to 1

BClear the CTRL register's ENABLE bit to 0

CWrite 0xFFFFFFFF to the LOAD register

DDisable the PendSV exception

Step-by-Step Solution

Solution:

Step 1: Identify SysTick control
The SysTick timer is controlled by the CTRL register, where setting the ENABLE bit starts the timer.
Step 2: Eliminate incorrect options
Clearing ENABLE stops the timer, writing max to LOAD sets reload value but doesn't enable, and disabling PendSV is unrelated.
Final Answer:
Set the CTRL register's ENABLE bit to 1 -> Option A
Quick Check:
SysTick enable = CTRL ENABLE bit set [OK]

Quick Trick: Enable SysTick by setting CTRL ENABLE bit [OK]

Common Mistakes:

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Which of the following is the correct way to enable the SysTick timer in ARM Cortex-M processors?