Register Quick Reference—IP2022 User’s Manual 402 www.ubicom.com C.3 Register Bit Definitions For those registers which have special functions assigned to bits
or fields within the register, the definition of those bits and fields is
described below. The registers are presented alphabetically. C.3.1 ADCCFG Register (A/D Converter Configuration) 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.
1 =   Write 1 to begin a new conversion. While the con- version is in progress, this bit reads as 1.