Specifies referencing model for the ADC. The parameter is given in text format. Valid options are:
“Vdd/Vss” Reference taken from the positive and negative rails of the power supply, where Vref+ is 3.3V, and Vref- is 0V (GND). The accuracy of the ADC in this case depends on the accuracy of the power supply.
“Vref+/Vss” Vref- is 0V (GND), and Vref+ is taken from the dedicated pin on PIC32 – port 16.
“Vdd/Vref-” Vref+ is taken from the positive rail of the power supply, and Vref- is taken from the dedicated pin on PIC32 – port 15.
“Vref+/Vref-” Both Vref- and Vref+ are taken from the dedicated pins on PIC32 – ports 15 and 16, respectively.
By default, Rittle uses ADC referencing to the power rails.