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Here a note about the spike detector :

>The calibration byte in the production signature row show 0xFF and 0x00
>for the ADC Calibration byte. Are these really the calibration values ?
>And I'm not able to set the HIGH Byte of the calibration register.
>Errata of Rev H don't show something from calibration bytes.

Reply from Atmel :

The voltage spike detector has been removed from the latest revision of the XMEGA A manual.
This is because we have, unfortunately, not been able to validate the spike detector fully.
The module is disabled in currently available parts to avoid unforeseen problems for any customers.