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RL78/G1A CHAPTER 12 SERIAL ARRAY UNIT
R01UH0305EJ0200 Rev.2.00 402
Jul 04, 2013
12.1.2 UART (UART0 to UART2)
This is a start-stop synchronization function using two lines: serial data transmission (TXD) and serial data reception
(R
XD) 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). The LIN-bus can be
implemented by using timer array unit with an external interrupt (INTP0).
For details about the settings, see 12.6 Operation of UART (UART0 to UART2) Communication.
[Data transmission/reception]
• Data length of 7, 8, or 9 bits
Note
• 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
In addition, UARTs of following channels supports the SNOOZE mode. When RxD input is detected while in the STOP
mode, the SNOOZE mode makes data reception that does not require the CPU possible. Only UART0 can be specified for
asynchronous reception.
The LIN-bus is accepted in UART2 (0 and 1 channels of unit 1) (32-pin to 64-pin products only).
[LIN-bus functions]
• Wakeup signal detection
• Break field (BF) detection
• Sync field measurement, baud rate calculation
Note Only UART0 can be specified for the 9-bit data length.
Using the external interrupt (INTP0) and
timer array unit