ADC Start Trigger Select Register
| AD0S | selects the start signal to be used to start the scan conversion of ADC unit0 |
| AD1S | selects the start signal to be used to start the scan conversion of ADC unit1 |
| AD2S | selects the start signal to be used to start the scan conversion of ADC unit2 |
| AD0P | selects the start signal to be used to start priority conversion of ADC unit0 |
| AD1P | selects the start signal to be used to start priority conversion of ADC unit1 |
| AD2P | selects the start signal to be used to start priority conversion of ADC unit2 |