7.1 MVIO Hardware Setup

Todo:
  • Modify the AVR128DB48 Curiosity Nano to work with two voltage domains
  • Set the AVR128DB48 Curiosity Nano fuses so it operates with two voltage domains
  1. Remove the resistor right below the VDDIO2 label to disconnect VDDIO2 from VDD. This is the resistor R204 in Figure   1, pointed to by the arrow in Figure   2.
    Figure 7-1. Assignment 6: VDDIO2 Schematic
  2. Connect a wire between PD2 and VDDIO2+, as shown in Figure   2.
    Figure 7-2. Assignment 5: Curiosity Nano AVR128DB48
  3. Set the MVSYSCFG bit field in the System Configuration 1 (SYSCFG) fuse to DUAL.
    Info: To program fuses in MPLAB® X, go to Production→Set Configuration Bits to open up the Configuration Bits window shown in Figure   3. Press the Read Configuration Bits button to read back the current fuse settings on the device. Set MVSYSCFG to DUAL and press Program Configuration Bits to program the current fuse settings onto the device.
    Figure 7-3. Assignment 5: MPLAB® X Fuse Programing
Result: The AVR128DB48 Curiosity Nano CNANO is ready to run with two power domains.