GPIO Pins and the Auxiliary Port
In addition to the primary port
GPIO1 can also function as an RS232 (only) serial transmit line and GPIO2 can function as an RS232 (only) serial receive line. The GPIO serial baud rate can be configured anywhere from 4800 to 250 K baud. The auxiliary serial baud rate can be configured anywhere from 4800 to 4 M baud. See Supported Baud Rate. Changes to these baud rates can be made by using the Baud Rates page in
The available GPIO and auxiliary functions are listed in the section Dynamic Pin Functions. The function of a GPIO pin or the auxiliary port can be changed at any time using the GPIO Configuration page in