8

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).