topic Re: kinetis KM35 UART Transmission buffer control of RTS in Kinetis Microcontrollers

kinetis KM35 UART Transmission buffer control of RTS

jun1 — Thu, 07 Jul 2022 05:27:33 GMT

Thank you for all your guidance.

I am using KM35(MKM35Z512VLL7R)
I have a question about the RTS control during UART transmission.

As shown in the figure, the RTS that allows the transmit buffer, when observed on an oscilloscope
It appears to rise one bit before the data to be transmitted.
When transmission is completed, it also appears to fall one bit later.
My questions are the following two points.
(1) Does the time for this one bit change according to the baud rate?
(2) Is there any description of this specification?　I looked in the reference manual but could not understand.

Thank you in advance.

Re: kinetis KM35 UART Transmission buffer control of RTS

Pavel_Hernandez — Thu, 07 Jul 2022 23:24:32 GMT

Hello,

In order to have in the same channel, Do you read the chapter 45.5.1.7 Transceiver driver enable, from the RM and do not understand?

I review the RM and in the UARTx_MODEM[RXRTSE] the assertion is controlled by this, and this will change depending on the baud rate.

Best regards,
Pavel

Re: kinetis KM35 UART Transmission buffer control of RTS

jun1 — Tue, 12 Jul 2022 01:38:24 GMT

Thank you very much. I understand.