IP2022 User’s Manual—Peripherals www.ubicom.com 299 4.7.5 ADCCFG Register 7 6 5 4 3 2 0 ADCREF ADCJST Reserved  ADCGO ADCS2:0 Name Description ADCREF A/D converter reference voltage select 0 =   AVdd is the reference voltage
1 =   RG3 port pin is used to receive an external refer- ence voltage ADCJST A/D converter result justification mode select (see Table 4-11) 00 =   Right justified
01 =   Signed
10 =   Left justified
11 =   Reserved ADCGO A/D converter GO/DONE bit 0 =   When the last conversion has completed, this bit           reads as 0. Clearing this bit terminates any conver-
          sion in progress, in which case the data must be
          ignored.
1 =   Write 1 to begin a new conversion. While the con- version is in progress, this bit reads as 1.