15.4.4.1 Initialization

Initialize the MVIO in Dual Supply configuration by following these steps:

1. Program the MVIO Operation Mode (MVIOMODE) bit in the User Configuration Fuse (USERCFG) register from BOOTCFG - Boot Configuration Fuses to the Dual Supply configuration (BOOTCFG.USERCGF.MVIOMODE = ‘0’).
2. Optional: Write the VDDIO2 OK Interrupt Enable bit to ‘1’ in the Interrupt Enable Set (INTENSET) register (INTENSET.VDDIO2OK=1).
3. Read the VDDIO2 OK (STATUS.VDDIO2OK) bit to check if the V_DDIO2 voltage is within the acceptable range for operation.
4. Configure and use the PORT pins powered by V_DDIO2.

If the MVIOMODE bit in the Boot Configuration Fuse is programmed to the Single Supply configuration (BOOTCFG.USECFG.MVIOMODE = ‘1’), the MVIO peripheral is not configurable, and the STATUS register will not be updated.