I'm not finding this very exciting. It's interesting that there's so much argument, but What I was attempting to find out was whether people are using the UART at rates below 4800 bps, and, if so, what they were doing with the serial port. I've gotten some plausible answers that persuade me that the lower baud rates, but probably not 110 baud, are still of some interest in conjunction with the UART.

Now I don't know why there's been such a flap over the sacred frequency of 11.0592 MHz. It is convenient, but, so long as one can generate a reasonable approximation of a standard baud rate for use as a console while doing development, I think whatever frequency is otherwise suitable would work as well unless one needs the ultra-low rates, which clearly does happen.

I'm pretty well convinced, at this point, that using any of the on-board serial ports in a development circuit is a mistake. I think an external UART is mandated, and that's why I'm planning to use one. That way, no matter which of the MCU's internal resources I want to use in my application, it will still be there for my target application.

As a standard clock rate, I like 24.576 MHz, because you can easily extract a number of very useful frequencies from that, such as 64 KHz,useful in telephony, exact multiples of nearly all the popular baud rates, 1.536 MHz, 2.048 MHz, and more.

I don't know what all the "excitement" is about either.

RE