Eight LEDs are connected to XMEGA PORTE. The LEDs are active low, and thus light up when the respective lines are output low by the XMEGA.
One green and one red LED are inside the same package and therefore the colors can be mixed to orange when both are activated. The red LED can be activated by driving the connected I/O line to GND. The green LED is controlled via a FET and is by default on when the board is powered. However this power indicator LED can also be turned off by driving the gate of the FET to GND. Both LEDs are controlled by the Atmel AT32UC3B1256. The default firmware will use the red LED to signal activity on the UART to USB bridge by toggling the LED.