For Manchester encoding, the USART needs to operate in SPI Master mode. SCK of USART is used as the Manchester clock signal. Transmit data from the USART_TXDATA register is used as Manchester data. To encode the data, the CCL linked with USART is used to execute XNOR logic for the G. E Thomas convention, as shown in Figure 2-1. For the IEEE 802.3 convention, XOR logic should be implemented for clock and data. To keep aligned, the same XNOR logic in CCL is used, but the data executes NOT logic in advance. The output is connected to the CCL LUT-OUT pin.