41.5.2 ADCON1

ADC Control Register 1
Name: ADCON1
Address: 0x3F4

Bit 76543210 
 PPOLIPENGPOL   PCSCDSEN 
Access R/WR/WR/WR/WR/W 
Reset 00000 

Bit 7 – PPOL Precharge Polarity

Action During 1st Precharge Stage
ValueNameDescription
x ADPRE = 0 Bit has no effect
1 ADPRE > 0

External analog I/O pin is connected to VDD

Internal AD sampling capacitor (CHOLD) is connected to VSS

0 ADPRE > 0

External analog I/O pin is connected to VSS

Internal AD sampling capacitor (CHOLD) is connected to VDD

Bit 6 – IPEN A/D Inverted Precharge Enable

ValueNameDescription
x DSEN = 0 Bit has no effect
1 DSEN = 1 The precharge and guard signals in the second conversion cycle are the opposite polarity of the first cycle
0 DSEN = 1 Both Conversion cycles use the precharge and guards specified by PPOL and GPOL

Bit 5 – GPOL Guard Ring Polarity Selection

ValueDescription
1 ADC guard Ring outputs start as digital high during Precharge stage
0 ADC guard Ring outputs start as digital low during Precharge stage

Bit 1 – PCSC Precharge Sample Capacitor Only

ValueDescription
1 Precharge only applies to the internal sampling capacitor
0 Precharge applies to both the internal sampling capacitor and the external I/O pin

Bit 0 – DSEN Double-Sample Enable

ValueDescription
1 Two conversions are processed as a pair. The selected computation is performed after every second conversion.
0 Selected computation is performed after every conversion