Communication through the UART-to-USB gateway

The XMEGA UARTC0 is connected to a UART on the AT32UC3B1256. The AT32UC3B1256 UART is communicating at 115200 baud, using one start bit, eight data bits, one stop bit, and no parity.

When the AT32UC3B1256 device is enumerated (connected to a PC), the data transmitted from the XMEGA is passed on to a (virtual) COM port. This means that it is possible to use a terminal program to receive the transmitted data on a PC. Similarly, data transmitted from the PC COM port is passed on to the XMEGA UART through the gateway.

Note: The AT32UC3B1256 is also connected to the shared SPI and TWI lines, and so it is also possible to add TWI and SPI gateway functionality for these serial interfaces, if desired. This gateway functionality is not available in the default firmware for the AT32UC3B1256. Refer to the schematics for more information about these connections.