Ah - die ARef-Jumper. Jetzt macht's Sinn... Und ein Blick in die Anleitung zum STK600 erklärt auch, wieso PA1 Ärger macht:
Gruß,For xmega devices the AREF pins is also general purpose I/O pins. Hence, to use the pins as GPIO the Aref jumpers must be removed.
Note: For routingcard "STK600-RC100X-13" revision A and revision B the AREF1 is connected to PA1. These cards are marked "A0607.3.1213.A" and "A0607.3.1213.B"
askazo
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