You want to design an ARM system that wakes up only on a specific GPIO pin going high but ignores all other interrupts. How should you configure the wake-up sources?

hard📝 Application Q9 of 15

ARM Architecture - Power Modes

AEnable all wake-up sources and filter in software after wake-up

BEnable timer wake-up and ignore GPIO interrupts

CDisable all wake-up sources and use polling

DEnable wake-up only on the specific GPIO pin and mask other interrupts

Step-by-Step Solution

Solution:

Step 1: Selectively enable wake-up sources
To wake only on one GPIO pin, enable its wake-up source bit and disable others.
Step 2: Mask other interrupts
Masking other interrupts prevents unwanted wake-ups from other sources.
Final Answer:
Enable wake-up only on the specific GPIO pin and mask other interrupts -> Option D
Quick Check:
Selective wake-up = Enable one source, mask others [OK]

Quick Trick: Enable only needed wake-up source, mask rest [OK]

Common Mistakes:

Enabling all sources and filtering later wastes power
Using polling defeats low-power benefits
Ignoring GPIO wake-up configuration

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More ARM Architecture Quizzes

You want to design an ARM system that wakes up only on a specific GPIO pin going high but ignores all other interrupts. How should you configure the wake-up sources?

Step 1: Selectively enable wake-up sources

Step 2: Mask other interrupts

Final Answer:

Quick Check:

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