15.4.4.2 Low Power Operation

When operating in Dual Supply mode, the MVIO peripheral can be configured in one of three ways, selected by VDDIO2 Configuration bit field in MVIO Control register (MVIO.VDDIO2CFG):
  • Normal mode (NORMAL), in which the VDDIO2 voltage domain is active and voltage detectors are enabled
  • Low Power mode (LOWPOWER), in which the VDDIO2 voltage domain is active, but the voltage detectors are turned off to save power
  • Off mode (VDDIO2OFF), in which the MVIO-capable I/O pins are disabled. This mode can be used, for example, during sleep mode to save power when the VDDIO2 domain is not needed.

In Low-Power mode, if the voltage on the VDDIO2 pin(s) drops below the POR voltage and is then restored, the VDDIO2 Low-Power mode POR (STATUS.VDDIO2LPMPOR) bit will be set. The power failure will not be detected until power-on VDDIO2 is restored.