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TX pin opens after completion of PDG SCI transmission

Last Updated:05/24/2017

Question:

The output from the TXD pin lowers gradually if the final data is High at the end of SCI communication using the Peripheral Driver Generator (PDG).

Answer:

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.
FAQ

Suitable Products

CS+ (formery CubeSuite+)
High-performance Embedded Workshop
Peripheral Driver Generator
Renesas Peripheral Driver Library