Now I don't know why there's been such a flap over the sacred frequency of 11.0592 MHz.
why do you keep stating "sacred", it is not. It is NOT used bercause it is "sacred", it is used because it can generate 9600 - up which 12 can not. Today 22.1184 is gradually becoming the usual YES, "the usual" NOT "the sacred"..

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.
1) you can NOT "generate a reasonable approximation" with e.g 12MHz
2) you are waaay off, the "ultra-low rates" are the ones easy to generate with an "off" crystal

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.
most of us do not live in an ivor tower where the cost of an external UART does not matter.

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.
where is the gain???????????? you get the same number of interrupts, you have to do the same processing whether you use an external or internal UART.

Erik


I'm not finding this very exciting Then why do you use words like "sacred" "extreme tenacity" "that old standby".

Also, reading through your posts, I find the word "convenient" in almost all of them. If it is more important to you that it is "convenient" that it is "best" then I think you should rethink your approach.