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
Hii larry SF
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
As configured in the figure above, DE is enabled, and no waveform changes are detected by logic analyzer. The procedure is as follows, please help to check, or if there is a routine can share.
RA8_UART.zip
Please enable flow control support to activate RS845. Refer to the image below, as the settings differ for the RA8D1 compared to the RA2L1 configuration. Rest setting in your project seems to be correct.
If that's right, why didn't DE signal out
Please refer to the RS485 project for the RA8D1. I have tested this project, and it is working well. I have also uploaded a screenshot showing the DE pin toggling high and low. Kindly review it and let me know if you encounter any issues
Pin 601 response
UARTra8m1.zip
After checking it many times, I think there is no problem with my configuration, but I can't achieve your waveform
Hello larry SF
Please create a fresh project and aplly the same configuration to it and then please check and let me know if it works for you .
Kind Regards,
GN_Reenesas
1667.UARTra8m1.zip1, I have a new project, no.2. Since the pins of our board SCI0 are occupied, I can't change your project to SCI3, P408, P409, and P410. I can't send data