In SX Microcontrollers, SX/B Compiler and SX-Key Tool, JonnyMac wrote:

I've never bought into that "odd number" argument for serial sampling; I've always used 4x (or higher lower baud rates when I want to choose), except for DMX which runs 250K baud where I use 3x sampling.  Assuming you want to do 19_200 baud your ISR needs to run 76_800 times per second (every 13.02 microseconds) -- using 4x sampling.

If you're going to use SX/B the attached program may give you a boost; you'll want to adjust the ISR rate and the baud constants, but that's pretty easy to do.

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