Control C

Name:
CTRLC
Offset:
0x02
Reset:
0x00
Access:
-
Bit76543210
SAMPCAPREFSEL[1:0]PRESC[2:0]
AccessRR/WR/WR/WRR/WR/WR/W
Reset00000000

Bit 6 – SAMPCAP: Sample Capacitance Selection

Sample Capacitance Selection

This bit selects the sample capacitance, and hence, the input impedance. The best value is dependent on the reference voltage and the application's electrical properties.
ValueDescription
0 Recommended for reference voltage values below 1V.
1 Reduced size of sampling capacitance. Recommended for higher reference voltages.

Bits 5:4 – REFSEL[1:0]: Reference Selection

Reference Selection

These bits selects the voltage reference for the ADC.

ValueNameDescription
0x0 INTERNAL Internal reference
0x1 VDD VDD
0x2 VREFA External reference VREFA
Other - Reserved.

Bits 2:0 – PRESC[2:0]: Prescaler

Prescaler

These bits defines the division factor from peripheral clock (CLK_PER) to the ADC clock (CLK_ADC).

ValueNameDescription
0x0 DIV2 CLK_PER divided by 2
0x1 DIV4 CLK_PER divided by 4
0x2 DIV8 CLK_PER divided by 8
0x3 DIV16 CLK_PER divided by 16
0x4 DIV32 CLK_PER divided by 32
0x5 DIV64 CLK_PER divided by 64
0x6 DIV128 CLK_PER divided by 128
0x7 DIV256 CLK_PER divided by 256