Chapter 13Serial Interface 2Operation XIII - 2513.3.4 UART Serial InterfaceSerial interface 2 is capable of duplex UART communication. Table: 13.3.8 shows UART serial interface func-tions.Table:13.3.8 UART Serial Interface Functions■ Activation Factor for CommunicationAt transmission, if data is set in the transmission data buffer SC2TB, a start condition is generated to start transfer.At reception, reception is started by receiving a start bit. In reception, when the data length of “L” for input datais equal to or longer than 0.5 bit, that is recognized as a start bit.■ TransmissionData transmission is automatically started when data is set in the transmission data buffer SC2TB. When trans-mission is completed, the serial 1 transmission interrupt SC2TIRQ is generated.■ ReceptionWhen a start bit is recognized, reception is started after the transfer bit counter that counts transfer bit is cleared.The serial interface 2 interrupt SC2RIRQ is generated when the reception is completed.■ Duplex CommunicationIn duplex communication, transmission and reception can be performed independently at the same time. In thiscase, the frame mode and parity bit polarity of data on transmission/reception must be the same.■ Transmission Data BufferRefer to: XIII-11■ Reception Data BufferRefer to: XIII-12Communication style UART (duplex)Interrupt SC2TIRQ (transmission), SC2RIRQ (reception)Pin SBO2 (I/O)SBI2 (input)First transfer bit specification MSB/LSB firstParity bit selection OParity bit control0 parity1 parityEven parityOdd parityFrame selection7 data bits +1STOP7 data bits +2STOP8 data bits +1STOP8 data bits+2STOPContinuous operation OMaximum transfer rate300 kbps(standard 300 bps to 38.4 kbps)(with baud rate timer)
