SAM L21

9.1 Power Domain Overview

The Atmel SAM L21 power domains operate independenly of each other:

VDDCORE, VDDIO and VDDIN share GND, whereas VDDANA refers to GNDANA.
VDDANA and VDDIN must share the main supply, VDD.
VDDCORE serves as the internal voltage regulator output. It powers the core, memories, peripherals, DFLL48M and FDPLL96M.
VSWOUT and VDDBU are internal power domains.
On SAM L21E, VDDIO is electrically connected to the VDDANA domain and supplied through VDDANA.

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