atxmega32e5 offset correction - negative offset correction value possible?

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I have a small question, where i have not found any answere so far, not in the web and neither in the manual.

I would like to know if the OFFSETCORR value for correcting the offset error can be a negative value? The manual only tells me that it is a 12 bit value and the ASF framework needs an uint16 bit value for it. Furthermore, in the ASF example projects for ADC correction, only single ended usigned values are obtained... since i have signed differential conversion i can have a negative offset value as well. Does anybody know if a negative 12 bit value is working?