Initialization

To operate the DAC, the following steps are required:

• Select the DAC reference voltage in the Voltage Reference (VREF) peripheral by writing the DAC and AC Reference Selection bits (DAC0REFSEL) in the Control A register of the Voltage Reference (VREF.CTRLA).
• The conversion range is between GND and the selected reference voltage.
• Configure the further usage of the DAC output:
  • Configure an internal peripheral (e.g. AC, ADC) to use the DAC output. See the according peripheral's documentation.
  • Enable the output to a pin by writing a '1' to the Output Enable bit (OUTEN) in the Control A register (DAC.CTRLA). This requires configuration of the Port peripheral.
• Write an initial digital value to the Data register (DAC.DATA).
• Enable the DAC by writing a '1' to the ENABLE bit in the Control A register (DAC.CTRLA).