The PIXXI-28 Processor has a single hardware asynchronous serial port with fixed pins TX/RX. The PIXXI-28’s serial port can be used to communicate with external serial devices and is also used for programming the PIXXI-28 itself.
The primary features are:
Full-Duplex 8-bit data transmission and reception.
Data format: 8-bits, No Parity, 1 Stop bit.
Independent Baud rates from 300 baud up to 2187500 baud.
This serial UART is also the programming interface for User program downloads. Once the compiled application is downloaded and the user code starts executing, the serial port is then available to the user application.
TX pin (Serial Transmit):
Dedicated Asynchronous Serial port transmit pin, TX. Connect this pin to external serial device receive (RX) signal. This pin outputs at 3.3V levels.
RX pin (Serial Receive):
Dedicated Asynchronous Serial port receive pin, RX. Connect this pin to external serial device transmit (TX) signal. This pin is 5.0V tolerant.
Note: The serial UART output at the level of TTL 3.3V, however is 5V tolerant on the RX pin, so can accept communications from 5V devices.