18.6.3.3.4 OFF Mode

In Off mode, the device is entirely powered-off.

Entering Off mode: This mode is entered by selecting the Off mode in the Sleep Configuration register by writing the Sleep Mode bits (SLEEPCFG.SLEEPMODE=OFF), and subsequent execution of the WFI instruction.
Exiting Off mode: This mode is left by pulling the RESET pin low, or when a power Reset is done.

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