# Transmit Data Polarity

The polarity of the transmit data can be controlled with the Clock/Transmit Polarity Select (SCKP) bit. The default state of this bit is ‘0’, which selects high true transmit Idle and data bits. Setting the SCKP bit to ‘1’ will invert the transmit data resulting in low true Idle and data bits. The SCKP bit controls transmit data polarity in Asynchronous mode only. In Synchronous mode, the SCKP bit has a different function. See Clock Polarity for more details.