ATXMEGA64A1-CU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATXMEGA64A1-CU

8/16-bit XMEGA A1 Microcontroller

Atmel Corporation 

XMEGA A1

Problem fix/Workaround

AC0OUT for ACB should not be enabled when JTAG is used. Use only analog comparator

output for ACA when JTAG is used, or use the PDI as debug interface.

15. Bandgap measurement with the ADC is non-functional when VCC is below 2.7V

The ADC cannot be used to do bandgap measurements when VCC is below 2.7V.

Problem fix/Workaround

If internal voltages must be measured when VCC is below 2.7V, measure the internal 1.00V

reference instead of the bandgap.

16. 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 channel.

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

Enable both DFLLs and oscillators when using automatic runtime calibration for one of the

internal oscillators.

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8067L–AVR–08/10

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