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

I think the SX is a better start place than the PIC, but I'm biased.  

First, you get a free compiler (SX/B) with the SX.  The SX and SX/B come  from Parallax which means you get these forums and other good support.  Tools are inexpensive (though I think that if you're serious about SX development you should get a PDB).  Code you develop for the SX28 will work on the SX20 (I do this a lot); and the port to the SX48 is straightforward.  The best part is that with jitter-free interrupts you can create "virtual peripherals" in code -- this is what got the SX started.

You only need an external resonator when you must run faster than 4MHz or when timing is critical, as in serial applications.  I've done boatloads of serial apps with the SX -- all of the serial accessories we have at EFX-TEK use an SX20 or SX28 as the host processor.  All were programmed in SX/B, including the FC-4 which handles "background" serial and dimming control of four AC lamp circuits.

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