Atmel REB233-XPRO User Manual page 10

Pin number Name
9 IRQ/GPIO
10 SPI_SS_B/GPIO
11 TWI_SDA
12 TWI_SCL
13 USART_RX
14 USART_TX
15 SPI_SS_A
16 SPI_MOSI
17 SPI_MISO
18 SPI_SCK
19 GND
20 VCC
Description
Interrupt request line and/or general purpose I/O.
Slave select for SPI and/or general purpose I/O.
Data line for two-wire interface. Always implemented, bus
type.
Clock line for two-wire interface. Always implemented, bus
type.
Receiver line of Universal Synchronous and Asynchronous
serial Receiver and Transmitter.
Transmitter line of Universal Synchronous and
Asynchronous serial Receiver and Transmitter.
Slave select for SPI. Should be unique if possible.
Master out slave in line of Serial peripheral interface. Always
implemented, bus type.
Master in slave out line of Serial peripheral interface. Always
implemented, bus type.
Clock for Serial peripheral interface. Always implemented,
bus type.
Ground.
Power for extension board.
REB233-XPRO User Guide [USER GUIDE] 10
42188A-MCU-11/2013