[Solved] Given the following code snippet, what will happen when the SysTick timer reaches zero?SysTick->LOAD = 1000 - 1;SysTick->VAL = 0;SysTick->CTRL = 7; | ARM Architecture

ARM Architecture - Exception and Interrupt Model

Given the following code snippet, what will happen when the SysTick timer reaches zero?

SysTick->LOAD = 1000 - 1;
SysTick->VAL = 0;
SysTick->CTRL = 7;

ASysTick exception triggers periodically every 1000 clock cycles

BPendSV exception triggers immediately

CNo exception triggers because CTRL is incorrectly set

DHardFault exception occurs due to invalid VAL

Step-by-Step Solution

Solution:

Step 1: Analyze SysTick configuration
LOAD is set to 999, VAL cleared to 0, CTRL set to 7 (enable, tick interrupt, clock source).
Step 2: Understand effect
SysTick counts down from 999 to 0, then triggers SysTick exception periodically.
Final Answer:
SysTick exception triggers periodically every 1000 clock cycles -> Option A
Quick Check:
SysTick timer setup = periodic interrupt [OK]

Quick Trick: SysTick CTRL=7 enables periodic interrupts [OK]

Common Mistakes:

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Given the following code snippet, what will happen when the SysTick timer reaches zero?