33.6.3 Control C
| Name: | CTRLC |
| Offset: | 0x08 |
| Reset: | 0x00000000 |
| Property: | Local Write-Protection |
| Bit | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | |
| Access | |||||||||
| Reset |
| Bit | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | |
| Access | |||||||||
| Reset |
| Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
| Access | |||||||||
| Reset |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| REFSEL[2:0] | |||||||||
| Access | R/W | R/W | R/W | ||||||
| Reset | 0 | 0 | 0 | ||||||
Bits 2:0 – REFSEL[2:0] Reference Selection
This bit field selects the voltage reference for the ADC. Switching to internal references requires a 40 μs initialization time for the first conversion. Internal references can only be used if they are lower than VDD - 0.5V.
| Value | Name | Description |
|---|---|---|
| 0x0 | VDD | VDD |
| 0x2 | EXTVREF | External pin used as reference |
| 0x4 | 1V024 | Internal reference 1.024V |
| 0x5 | 2V048 | Internal reference 2.048V |
| 0x6 | 4V096 | Internal reference 4.096V |
| 0x7 | 2V500 | Internal reference 2.500V |
| Other | — | Reserved |