You want to implement a simple cooperative multitasking system using PendSV and SysTick. Which sequence correctly describes how these exceptions interact?

hard📝 Application Q8 of 15

ARM Architecture - Exception and Interrupt Model

ASysTick and PendSV trigger simultaneously and switch tasks together

BPendSV triggers periodically, sets SysTick to switch tasks, SysTick performs context switch

CPendSV triggers only on hardware faults, SysTick handles all task switching

DSysTick triggers periodically, sets PendSV to switch tasks, PendSV performs context switch

Step-by-Step Solution

Solution:

Step 1: Understand SysTick role
SysTick generates periodic interrupts to signal time slices.
Step 2: Understand PendSV role
PendSV is triggered by setting its pending bit to perform context switching.
Final Answer:
SysTick triggers periodically, sets PendSV to switch tasks, PendSV performs context switch -> Option D
Quick Check:
SysTick triggers, PendSV switches tasks [OK]

Quick Trick: SysTick triggers, PendSV switches tasks [OK]

Common Mistakes:

Reversing roles of SysTick and PendSV
Thinking they trigger simultaneously
Assuming PendSV triggers only on faults

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More ARM Architecture Quizzes

You want to implement a simple cooperative multitasking system using PendSV and SysTick. Which sequence correctly describes how these exceptions interact?

Step 1: Understand SysTick role

Step 2: Understand PendSV role

Final Answer:

Quick Check:

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