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

1) The internal clock is just not accurate enough for reliable serial comms.

2) You can count cycles or use Guenther's SX/Sim.  If you're using buffered serial it's mostly a "don't care" as it's happening in the background (unless you have a full buffer).  When using straight SEROUT it takes 10xbit_time to send a byte.  Bit time is 1/Baud.  At 2400, for example, the bit time is 416 microseconds and a full byte takes 4.16 milliseconds.

3) True, but you'll find a balance.  20MHz seems to be good for battery-run apps (all BS2 Stamps run 20MHz or faster).

4) There's www.sxlist.com, but you'll have to do a bit of touch up to incorporate the code found there into your SX/B programs.  I really don't think there's any true "plug and play" solution, though Peter Verkaik's very advanced approach to programming may come the closest.

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