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

Yes, but you might have to use SXASM rather than SX/B to get the proper timing. There are examples at the SX List website, but you might have to find one particular crystal for it.  The only difficulty with creating asynchronous serial i/o is that you have to use a crystal or resonator to properly hold the timing.  RC circuits vary too much.  You could even create an odd ball form - like 5 bits or 12 bits rather than the usual 7 or 8 bits.

If you are sticking to a standard formal without parity checking and without hardware handshaking signal, you might be able to teak the RTCC configuration generated by a standard SX/B program and reassemble it.  But nothing gets done with the the clock being a binary multiple of 7812 within less than one percent or better.

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