22.6.1.1 Enabling, Disabling, and Resetting

The LDO main voltage regulator is enabled after any Reset. The main voltage regulator (MAINVREG) cannot be disabled, therefore the Enable bit in the VREG register (VREG.ENABLE) must never be changed from its default (reset) value of one. The main voltage regulator output supply level is automatically defined by the Sleep mode selected in the Power Manager module.

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