20.2.1 Voltage Regulator
The SAM device controls the voltage regulators for the core (VDDCORE) and backup (VDDBU) domains. It sets the voltage regulators according to the sleep modes, the performance level, or the user configuration.
In active mode, the voltage regulator can be chosen on the fly between a LDO or a Buck converter. In standby mode, the low power voltage regulator is used to supply VDDCORE.