[Solved] You want to design an ARM-based sensor device that sleeps to save battery but wakes up only when either a motion sensor detects movement or a timer... Which wake-up source configuration is best? | ARM Architecture

ARM Architecture - Power Modes

You want to design an ARM-based sensor device that sleeps to save battery but wakes up only when either a motion sensor detects movement or a timer reaches 5 minutes. Which wake-up source configuration is best?

AConfigure only the timer as a wake-up source

BConfigure both motion sensor and timer as wake-up sources, waking on either event

CConfigure only the motion sensor as a wake-up source

DConfigure both but require both events to happen simultaneously to wake

Step-by-Step Solution

Solution:

Step 1: Understand the requirement
The device should wake up when either the motion sensor detects movement or the timer reaches 5 minutes, not both together.
Step 2: Choose correct configuration
Configuring both as wake-up sources with an OR condition allows waking on either event, saving battery and meeting requirements.
Step 3: Eliminate incorrect options
Only timer or only motion sensor misses one trigger; requiring both simultaneously delays wake-up unnecessarily.
Final Answer:
Configure both motion sensor and timer as wake-up sources, waking on either event -> Option B
Quick Check:
Wake on either event = configure both sources [OK]

Quick Trick: Use OR logic for multiple wake-up sources [OK]

Common Mistakes:

Configuring only one wake-up source
Requiring both events simultaneously
Ignoring battery saving by waking too often

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More ARM Architecture Quizzes

Which wake-up source configuration is best?

Step 1: Understand the requirement

Step 2: Choose correct configuration

Step 3: Eliminate incorrect options

Final Answer:

Quick Check:

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