RL78/G15 CHAPTER 12 SERIAL ARRAY UNIT
R01UH0959EJ0110 Rev.1.10 Page 460 of 765
Mar 7, 2023
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
Target channel Channel 0 of SAU0
Pins used TxD0
Interrupt INTST0
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
Transfer rate
Note 1
Max. f
MCK
/6 [bps] (SDRmn[15:9] = 2 or more), Min. f
CLK
/(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 bit
Data direction MSB or LSB first
Note 1. Use this operation within a range that satisfies the conditions above and the peripheral functions
characteristics specified in the electrical characteristics. For details, see CHAPTER 23 ELECTRICAL
SPECIFICATIONS (T
A
= −40 to +85°C) and CHAPTER 24 ELECTRICAL SPECIFICATIONS (T
A
= −40 to
+105°C, T
A
= −40 to +125°C).
Remark 1. f
MCK
: Operation clock frequency of target channel
f
CLK
: System clock frequency
Remark 2. m: Unit number (m = 0), n: Channel number (n = 0), mn = 00
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