User manual

Atmel AT02667: XMEGA-E5 Xplained Hardware User’s Guide [APPLICATION NOTE]
42084A−AVR−04/2013
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Table 3-5. Expansion header J4.
Pin on J4 Name on J4 XMEGA pin Shared with onboard functionality
1 SDA PD0 Shared with button SW100 (silkscreen SW0)
2 SCL PD1 Shared with Light sensor
(1)
3 RXD PD2 Shared with button SW101(silkscreen SW1)
4 TXD PD3 Shared with OLED display: reset function
5 SS PD4 Shared with LED D100 (silkscreen LED0)
6 MOSI PD7 Connected to the Board Controller
(2)
7 MISO PD6 Connected to the Board Controller
(2)
8 SCK PD5 Shared with LED D101 (silkscreen LED1)
9 GND - -
10 VCC_P3V3 - -
Notes: 1. Can be disconnected from onboard functionality by cut-strap J100.
2. RXD and TXD lines swapped from PD3 and PD4 and used for communication with board controller.