RA8D1 485 UART

When I use the SCI 485 UART function of RA8D1, the DE pin cannot be raised when sending data. When I try the SCI 485 UART function of RA2L1, the DE pin can be normally raised when sending data, and the strange thing is that the Settings of RA2L1 and RA8D1 are different

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  • Hii  

    The DE pin behavior difference between the RA8D1 and RA2L1 may stem from variations in their SCI peripheral configuration. Please confirm if the Driver Enable (DE) functionality is explicitly enabled in the RA8D1's SCI UART settings and if the DE pin polarity matches your RS-485 transceiver's requirements. Additionally, ensure the DE pin is correctly assigned and configured in the Pin Configurator with no conflicts. Are the Assertion and Negation times for DE set correctly? 

    Regards,

    GN_Renesas

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  • Hii  

    The DE pin behavior difference between the RA8D1 and RA2L1 may stem from variations in their SCI peripheral configuration. Please confirm if the Driver Enable (DE) functionality is explicitly enabled in the RA8D1's SCI UART settings and if the DE pin polarity matches your RS-485 transceiver's requirements. Additionally, ensure the DE pin is correctly assigned and configured in the Pin Configurator with no conflicts. Are the Assertion and Negation times for DE set correctly? 

    Regards,

    GN_Renesas

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