Nucleo-STM32H753ZI max baudrate with STLink-UART

I’ve experimentally determined that the ST STM32H753ZI-Nucleo board can handle a maximum baudrate of 7372800 baud (7.3728 Mbaud) when using the STLinkV3’s embedded UART bridge (connected to the STLink USB port).

This is based on a setup with Arduino, PlatformIO (default settings) and PySerial.

It has not been determined if this limit is due to the STLinkV3, the Nucleo board, or the STM32H753ZI itself, but even faster baud rates don’t work in this setup.