35.4.2.2 LIN Client Transmitter

When the Client process is a transmitter, software performs the following tasks in the order shown:

• The UxP2 register is written with a value equal to the number of bytes to transmit. This will enable the UxTXIF flag which is disabled when UxP2 is ‘0’.
• The C0EN bit is set or cleared to select the appropriate checksum
• Each byte of the process response is written to UxTXB when UxTXIF is set

The UART accumulates the checksum as each byte is written to UxTXB. After the last byte is written, the UART stores the calculated checksum in the UxTXCHK register and transmits the inverted result as the last byte in the response.

The UxTXIF flag is disabled when the number of bytes specified by the value in the UxP2 register have been written. Any writes to UxTXB that exceed the UxP2 count will be ignored and set the TXWRE flag.