RL78/G1H CHAPTER 14 SERIAL ARRAY UNIT
R01UH0575EJ0120 Rev. 1.20 Page 325 of 920
Dec 22, 2016
14.1.2 UART (UARTq)
This is a start-stop synchronization function using two lines: serial data transmission (TxD) and serial data
reception (RxD) lines. By using these two communication lines, each data frame, which consist of a start bit,
data, parity bit, and stop bit, is transferred asynchronously (using the internal baud rate) between the
microcontroller and the other communication party. Full-duplex UART communication can be performed by using
a channel dedicated to transmission (even-numbered channel) and a channel dedicated to reception (odd-
numbered channel).
For details about the settings, see 14.6 Operation of UART (UARTq) Communication.
[Data transmission/reception]
• Data length of 7, or 8 bits
• Select the MSB/LSB first
• Level setting of transmit/receive data and select of reverse
• Parity bit appending and parity check functions
• Stop bit appending
[Interrupt function]
• Transfer end interrupt/buffer empty interrupt
• Error interrupt in case of framing error, parity error, or overrun error
[Error detection flag]
• Framing error, parity error, or overrun error
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