Discussion
Match the mode with what it retains.
1. Sleep 2. Deep sleep 3. Shutdown
P. A retained region and the real time clock only Q. Core halted, peripherals and RAM live R. RAM retained, most clocks stopped
Answer: D
Correct answer: 1-Q, 2-R, 3-P
The three modes trade retained state against current. Sleep halts the core while leaving peripherals and RAM live, so a peripheral interrupt resumes execution immediately. Deep sleep retains the RAM but stops most clocks, so more state survives than in shutdown but wake-up takes longer. Shutdown keeps only a small retained region and the real time clock, drawing perhaps a microamp, and the application restarts rather than resumes.
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