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

What I tend to do is calculate my ISR rate at 4x my max bit rate.  If, for example, my max baud is going to be 38.4K then my ISR period will be 6.5 microseconds -- assuming 4x sampling.  If I decide to bump down to 19.2K then I change the bit timing becomes eight ISR periods.  This will make sense when you look at the baud constants in the demo program.

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