Renesas RX100 Series User Manual page 642

RX13T Group
Figure 23.8 shows an example of data transmission when the SCI is set to asynchronous mode according to the flow
described in Figure 23.7 after a reset. When the pin function is set to the TXD pin, it is still high-impedance because the
SCR.TE bit is 0. When the transmit data is written after setting the TE bit to 1, a data transmission starts. After the TE bit
is set to 1, one frame of high is output from TXD pin (internal wait time) and then the data transmission starts.
Mode
SCR.TE bit
Hi-Z
TXD pin
Pin function is set
Figure 23.8 Example of Data Transmission Timing in Asynchronous Mode
R01UH0822EJ0100 Rev.1.00
Jul 31, 2019
23. Serial Communications Interface (SCIg, SCIh)
Asynchronous mode
Wait time
Transmit data is written
Data transmission
0 D0 D1 D2
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