29.7.2 Control B
| Symbol | Description | Symbol | Description | Symbol | Description |
|---|---|---|---|---|---|
| R | Readable bit | HC | Cleared by Hardware | (Grey cell) | Unimplemented |
| W | Writable bit | HS | Set by Hardware | X | Bit is unknown at Reset |
| K | Write to clear | S | Software settable bit | — | — |
| Name: | CTRLB |
| Offset: | 0x01 |
| Reset: | 0x00 |
| Property: | PAC Write-Protection, Enable-Protected |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| REFSEL[1:0] | VPD | LEFTADJ | IOEN | EOEN | |||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | |||
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | |||
Bits 7:6 – REFSEL[1:0] Reference Selection
This bit field selects the Reference Voltage for the DAC.
Note: INT1V is the buffered internal reference of 1.0V, derived
from the internal 1.1V bandgap reference.
| Value | Name | Description |
|---|---|---|
| 0x0 | INT1V | Internal voltage reference |
| 0x1 | AVDD | Analog voltage supply |
| 0x2 | VREFA | External reference |
| 0x3 | - | Reserved |
Bit 3 – VPD Voltage Pump Disabled
This bit controls the behavior of the voltage pump.
| Value | Description |
|---|---|
| 0 | Voltage pump is turned on/off automatically |
| 1 | Voltage pump is disabled. |
Bit 2 – LEFTADJ Left-Adjusted Data
This bit controls how the 10-bit conversion data is adjusted in the Data and Data Buffer registers.
| Value | Description |
|---|---|
| 0 | DATA and DATABUF registers are right-adjusted. |
| 1 | DATA and DATABUF registers are left-adjusted. |
Bit 1 – IOEN Internal Output Enable
| Value | Description |
|---|---|
| 0 | Internal DAC output not enabled. |
| 1 | Internal DAC output enabled to be used by the AC. |
Bit 0 – EOEN External Output Enable
| Value | Description |
|---|---|
| 0 | The DAC output is turned off. |
| 1 | The high-drive output buffer drives the DAC output to the internal ADC Positive Mux Input Selection and to the VOUT pin. |