When using SCI for communication, R_PG_SCI_StartSending_Cn (n is a channel number), which is an API function of the Peripheral Driver Generator (PDG), is called.
From that function, R_SCI_SendData in the RPDL library is called.
The TXD pin returns to the initial value (port input) upon completion of transmission during processing of the R_SCI_SendData function. Therefore, the output from the TXD pin lowers gradually.
(Example: When the RX63N TXD12 pin is used)
If it is necessary to keep the data even after the end of transmission, rewrite the API function R_SCI_SendData in the RPDL adequately according to the following FAQs.
|CS+ (formery CubeSuite+)|
|High-performance Embedded Workshop|
|Peripheral Driver Generator|
|Renesas Peripheral Driver Library|