31.5.7 ADREF

ADC Reference Selection Register
Name: ADREF
Offset: 0x1D2B

Bit 76543210 
       PREF[1:0] 
Access R/WR/W 
Reset 00 

Bits 1:0 – PREF[1:0] ADC Positive Voltage Reference Selection

ValueDescription
11 VREF+ is connected to internal Fixed Voltage Reference (FVR) module
10 VREF+ is connected to external VREF+
01 Reserved
00 VREF+ is connected to VDD