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

Well, if you go back to those specifications, I think you will find a bit of 'voodoo'.

At 20mhz, you might try 1meg of resistance [I believe that is what it says].
Also, you can try to program the lowest driving power to the oscillator.
I suspect going too low will not do any damage, just cause the oscillator to stop.

I seem to be spending more time reading than actually building these things because I am away from home 12-14 hours a day.  When I do get to building, you will have helped me tooo.  Thanks.

By the way, do not worry about the 'internal resistor' as the SX-Key software only turns it on if you ask for the internal oscillator.  If you do turn it on and then later want to change back -- be sure to re-program before you plug in an external oscillator, crystal, resonant, or resistor.  

There seems to be the possiblity of causing greater overheating.  THIS NEEDS TO BE VERIFIED BY SOMEONE AT PARALLAX.

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