17.5.1.3 Sleep Mode Operation

In Standby mode, the low-power voltage regulator (LPVREG) is used to supply VDDCORE.

When the Run in Standby bit in the VREG register (VREG.RUNSTDBY) is written to '1', VDDCORE is supplied by the main voltage regulator. The VDDCORE level is set to the active mode voltage level.