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    There are four available I/O expansion headers on the XMEGA-B1 Xplained kit. Because of the low pin count on the device (LCD pins deducted), the I/O expansion header pins are shared with onboard functionality. If “clean” expansion ports are needed, cut-straps are available on some I/Os. Otherwise, it is only needed to remove a series resistor to remove onboard functionality. Following tables show what is shared on the respective header pins

    Table 2. XMEGA-B1 Xplained I/O expansion header J1

    Pin

    J1

    XMEGA pin

    Shared with onboard functionality

    1

    TWI SDA

    PC0

    -

    2

    TWI SCL / USART XCK0

    PC1

    -

    3

    USART RXD0

    PC2

    -

    4

    USART TXD0

    PC3

    -

    5

    SPI SS

    PC4

    -

    6

    SPI MOSI / USART-SPI SCK

    Swap USART XCK0

    PC5

    Serial Flash Clock (USART-SPI SCK)

    7

    SPI MISO / USART-SPI MISO

    Swap USART RXD0

    PC6

    Serial Flash Clock (USART-SPI MISO)

    8

    SPI SCK / USART-SPI MOSI

    Swap USART TXD0

    PC7

    Serial Flash Clock (USART-SPI MISO)

    9

    GND

    -

    -

    10

    VCC_P3V3 (VTG)

    -

    -


    Table 3. XMEGA-B1 Xplained I/O expansion header J2

    Pin

    J2

    UC3 pin

    Shared with onboard functionality

    1

    ACA0 / ADCA0 / ADCB8

    PA0

    -

    2

    ACA1 / ADCA1 / ADCB9

    PA1

    -

    3

    ACA2 / ADCA2 / ADCB10

    PA2

    -

    4

    ACA3 / ADCA3 / ADCB11

    PA3

    -

    5

    ACA4 / ADCA4 / ADCB12

    PA4

    -

    6

    ACA5 / ADCA5 / ADCB13

    PA5

    -

    7

    ACA6 / ADCA6 / ADCB14

    PA6

    -

    8

    ACA7 / ADCA7 / ADCB15

    PA7

    -

    9

    GND

    -

    -

    10

    AVCC (default = VTG)

    -

    -


    Table 4. XMEGA-B1 Xplained I/O expansion header J3

    Pin

    J3

    UC3 pin

    Shared with onboard functionality

    1

    ACB0 / ADCB0 / ADCA8

    PB0

    NTC sensor (ADCB0)

    2

    ACB1 / ADCB1 / ADCA9

    PB1

    Potentiometer measure (ADCB1)

    3

    ACB2 / ADCB2 / ADCA10

    PB2

    LDR sensor (ADCB2)

    4

    ACB3 / ADCB3 / ADCA11

    PB3

    External Voltage measure (ADCB3)

    5

    ACB4 / ADCB4 / ADCA12

    JTAG TMS

    PB4

    LED0 (PB4)

    6

    ACB5 / ADCB5 / ADCA13

    JTAG TDI

    PB5

    LED1 (PB5)

    7

    ACB6 / ADCB6 / ADCA14

    JTAG TCK

    PB6

    LED2 (PB6)

    8

    ACB7 / ADCB7 / ADCA15

    JTAG TDO

    PB7

    LED3 (PB7)

    9

    GND

    -

    -

    10

    V_BUS[a]

    -

    -

    [a] The VCC pin on this header has 5V and is connected to the USB


    Table 5. XMEGA-B1 Xplained I/O expansion header J4

    Pin

    J4

    UC3 pin

    Shared with onboard functionality

    1

    TIMER OC0A / Split TIMER OC0LA

    PE0

    QTOUCH0 (PE0)

    2

    TIMER OC0B / Split TIMER OC0LB

    USART XCK0

    PE1

    QTOUCH1 (PE1)

    3

    TIMER OC0C / Split TIMER OC0LC

    USART RXD0

    PE2

    QTOUCH2 (PE2)

    4

    TIMER OC0D / Split TIMER OC0LD

    USART TXD0

    PE3

    QTOUCH3 (PE3)

    5

    Swap TIMER OC0A / Split TIMER OC0HA

    PE4

    Power LED (PE4)

    6

    Swap TIMER OC0B / Split TIMER OC0HB

    Swap USART XCK0

    PE5

    LCD Backlight (Swap TIMER OC0B)

    7

    Swap TIMER OC0C / Split TIMER OC0HC

    Swap USART RXD0

    PE6

    RTC 32.768 kHz (TOSC2 Alternate)

    8

    TIMER OC0D / Split TIMER OC0HD

    Swap USART TXD0

    PE7

    RTC 32.768 kHz (TOSC1 Alternate)

    9

    GND

    -

    -

    10

    VCC_P3V3 (VTG)

    -

    -


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