User manual

Atmel AVR1923

8394B-AVR-02/12

Table 4-4. Expansion header J3.

Pin on J3 Name on J3 XMEGA pin Shared with onboard functionality

1 PA0 PA0 Light sensor

(1)

2 PA1 PA1 Temperature sensor

(1)

3 PA2 PA2 Filter output

(1)

4 PA3 PA3 Display reset

5 PB4 PB4 JTAG TMS

6 PB5 PB5 JTAG TDI

7 PB6 PB6 JTAG TCK

8 PB7 PB7 JTAG TDO

9 GND - -

10 VCC_P5V0 - -

Note: 1. Can be disconnected from onboard functionality by cut-straps.

The header J4 offers digital communication interfaces such as UART and TWI but

care must be taken because some pins are also connected to on-board peripherals.

Table 4-5. Expansion header J4.

Pin on J4 Name on J4 XMEGA pin Shared with onboard functionality

1 SDA PE0 -

2 SCL PE1 -

3 RXD PE2 -

4 TXD PE3 -

5 SS PD0 Display register select

(1)

6 MOSI PD3 Serial flash MOSI

7 MISO PD2 Display and serial flash MISO input

8 SCK PD1 Display and serial flash clock input

9 GND - -

10 VCC_P3V3 - -

Note: 1. Can be disconnected from onboard functionality by cut-strap (J204).