Renesas RL78 Series User Manual page 489

RL78/G1D
13.6.1 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
Target channel
Pins used
Interrupt
Error detection flag
Transfer data length
Note 2
Transfer rate
Data phase
Parity bit
Stop bit
Data direction
Notes 1. Only 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 30 ELECTRICAL SPECIFICATIONS).
Remarks 1. f : Operation clock frequency of target channel
MCK
f : System clock frequency
CLK
2. m: Unit number (m = 0), n: Channel number (n = 0, 2), mn = 00, 02
R01UH0515EJ0120 Rev.1.20
Dec 16, 2016
UART0
Channel 0 of SAU0
TxD0
INTST0
Transfer end interrupt (in single-transfer mode) or buffer empty interrupt (in continuous transfer mode)
can be selected.
None
Note 1
7, 8, or 9 bits
Max. f /6 [bps] (SDRmn[15:9] = 2 or more), Min. f
MCK
Non-reverse output (default: high level)
Reverse output (default: low level)
The following selectable
● No parity bit
● Appending 0 parity
● Appending even parity
● Appending odd parity
The following selectable
● Appending 1 bit
● Appending 2 bits
MSB or LSB first
CHAPTER 13 SERIAL ARRAY UNIT
UART1
Channel 2 of SAU0
TxD1
INTST1
15
/(2 × 2 × 128) [bps]
CLK
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