35.6.5 Events

The DAC Controller can generate the following output events:

  • Data Buffer Empty (EMPTY): Generated when the internal data buffer of the DAC is empty. Refer to DMA Operation for details.

Writing a '1' to an Event Output bit in the Event Control register (EVCTRL.EMPTYEO) enables the corresponding output event. Writing a '0' to this bit disables the corresponding output event.

The DAC can take the following action on an input event:

  • Start Conversion (START): DATABUF value is transferred into DATA as soon as the DAC is ready for the next conversion, and then conversion is started. START is considered as asynchronous to GCLK_DAC thus it is resynchronized in DAC Controller. Refer to Digital to Analog Conversion for details.

Writing a '1' to an Event Input bit in the Event Control register (EVCTRL.STARTEI) enables the corresponding action on an input event. Writing a '0' to this bit disables the corresponding action on input event.

Note:
  • When several events are connected to the DAC Controller, the enabled action will be taken on any of the incoming events.
  • When a DAC Start Conversion event is enabled, only DATABUF must be written (not DATA)

By default, DAC Controller detects rising edge events. Falling edge detection can be enabled by writing a '1' to EVCTRL.INVEIx.