47.6.2.3 DAC Configuration

Each individual DAC is configured by its respective DAC Control register (DACCTRLx)). These settings are applied when DAC Controller is enabled and can be changed only when DAC Controller is disabled.

  • Enable the selected DAC by writing a '1' to DACCTRLx.ENABLE.
  • Select the data alignment with DACCCTRLx.LEFTADJ. Writing a '1' will left-align the data (DATABUFx/DATAx[31:20]). Writing a '0' to LEFTADJ will right-align the data (DATABUFx/DATAx[11:0]).
  • If operation in standby mode is desired for DACx, write a '1' to the Run in Standby bit in the DAC Control register (DACCCTRLx.RUNSTDBY). If RUNSTDBY=1, DACx continues normal operation when system is in standby mode. If RUNSTDBY=0, DACx is halted in standby mode.
  • Select dithering mode with DACCCTRLx.DITHER. Writing '1' to DITHER will enable dithering mode, writing a '0' will disable it. Refer to Dithering Mode for details.
  • Select the refresh period with the Refresh Period bit field in DACCCTRLx.REFRESH[3:0]. Writing any value greater than '1' to the REFRESH bit field will enable and select the refresh mode. Refer to Conversion Refresh for details.
  • Select the output buffer current according to data rate (for low power application) with the Current Control bit field DACCTRLx.CCTRL[1:0]. Refer to Output Buffer Current Control for details.
  • Select standalone filter usage by writing to DACCTRLx.FEXT. Writing FEXT=1 selects a standalone filter, FEXT=0 selects the filter integrated to the DAC. See also Interpolation Mode for details.
  • Select the filter oversampling ratio by writing to DACCTRLx.OSR[2:0]. writing OSR=0 selects no oversampling; writing any other value will enable interpolation of input data. See also Interpolation Mode for details.

Once the DAC Controller is enabled, DACx requires a startup time before the first conversion can start. The DACx Startup Ready bit in the Status register (STATUS.READYx) indicates that DACx is ready to convert a data when STATUS.READYx=1.

Conversions started while STATUS.READYx=0 shall be discarded.

VOUTx is at tri-state level if DACx is not enabled.