Datasheet

111
[Not recommended for new designs - Use XMEGA A1U series] XMEGA A1 [DATASHEET]
8067O–AVR–06/2013
17. DAC refresh may be blocked in S/H mode
If the DAC is running in Sample and Hold (S/H) mode and conversion for one channel is done at maximum rate
(i.e. the DAC is always busy doing conversion for this channel), this will block refresh signals to the second chan-
nel.
Problem fix/Workarund
When using the DAC in S/H mode, ensure that none of the channels is running at maximum conversion rate, or
ensure that the conversion rate of both channels is high enough to not require refresh.
18. Inverted I/O enable does not affect Analog Comparator Output
The inverted I/O pin function does not affect the Analog Comparator output function.
Problem fix/Workarund
Configure the analog comparator setup to give a inverted result (i.e. connect positive input to the negative AC input
and vice versa), or use and externel inverter to change polarity of Analog Comparator Output.
19. Both DFLLs and both oscillators has to be enabled for one to work
In order to use the automatic runtime calibration for the 2 MHz or the 32 MHz internal oscilla-tors, the DFLL for
both oscillators and both oscillators has to be enabled for one to work.
Problem fix/Workarund
Enabled both DFLLs and oscillators when using automatic runtime calibration for one of the internal oscillators.