43.6.2.5 Voltage Reference Selection
The ADC’s voltage reference is selected by CTRLD.VREFSEL[2:0]:
| VREFSEL[2:0] | ADREF+ | ADREF- |
|---|---|---|
000 |
AVDD | AVSS |
001 |
External VREFH | AVSS |
010 - 111 |
Reserved | Reserved |