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RL78/G1A CHAPTER 12 SERIAL ARRAY UNIT
R01UH0305EJ0200 Rev.2.00 505
Jul 04, 2013
12.6.1 UART transmission
UART transmission is an operation to transmit data from the RL78 microcontroller to another device asynchronously
(start-stop synchronization).
Of two channels used for UART, the even channel is used for UART transmission.
UART UART0 UART1 UART2
Target channel Channel 0 of SAU0 Channel 2 of SAU0 Channel 0 of SAU1
Pins used TxD0 TxD1 TxD2
INTST0 INTST1 INTST2 Interrupt
Transfer end interrupt (in single-transfer mode) or buffer empty interrupt (in continuous transfer mode)
can be selected.
Error detection flag None
Transfer data length 7, 8, or 9 bits
Note 1
Transfer rate
Note 2
Max. fMCK/6 [bps] (SDRmn[15:9] = 2 or more), Min. fCLK/(2 × 2
15
× 128) [bps]
Data phase Non-reverse output (default: high level)
Reverse output (default: low level)
Parity bit The following selectable
• No parity bit
• Appending 0 parity
• Appending even parity
• Appending odd parity
Stop bit The following selectable
• Appending 1 bit
• Appending 2 bits
Data direction MSB or LSB first
Notes 1. Only following UART0 can be specified for the 9-bit data length.
2. Use this operation within a range that satisfies the conditions above and the peripheral functions
characteristics in the electrical specifications (see CHAPTER 29 ELECTRICAL SPECIFICATIONS (T
A =
−40 to +85°C), CHAPTER 30 ELECTRICAL SPECIFICATIONS (G: INDUSTRIAL APPLICATIONS TA =
−40 to +105°C)).
Remarks 1. f
MCK: Operation clock frequency of target channel
f
CLK: System clock frequency
2. m: Unit number (m = 0, 1), n: Channel number (n = 0, 2), mn = 00, 02, 10
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