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UART baud rate

Question asked by obid.matic on Jun 13, 2016
Latest reply on Jun 13, 2016 by Clive One

I communicate between two F303 parts over UART. Both modules are clocked with 72 MHz. USART1 on one part is on APB2, which runs at 72 MHz. On the other part, USART2 is used, which is on APB1 (36 MHz). But USART2 is configured to run on SYSCLK at 72 MHz, too.

Now, my question is, what maximum baud rate could I expect? With 3 Mbits/s it works. With 3.5 Mbits/s, the communication is not always correct and with 4 Mbits/s it is never correct.

I have 1m long cable between these two PCBs, connection is RS-422 type.

Is 3 Mbits/s maximum what I can get out of these system?