STK1000/Connection of leds and switches
From AVRFreaks Wiki
STK1000 provide a flexible way of connecting user LEDs and user switches to the GPIO header. This allows the user to select which GPIO pins of AVR32 to use for input and output as well as an easy way to connect custom peripherals.
Schematics
All of the 10-pin headers have 8 signals, GND and VCC. The correct connection of the jumper cables is shown above. The simplified block diagram below shows how switches and LEDs connect to GPIO of AVR32 parts.