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

[quote="DosManDan"]I installed the 220 ohm resistor from the center post of the 4Mhz resonator to ground. The resonator is not supposed to need any capacitors or resistors.[/quote]

I'm not sure about that. The big resiny DIP resonators include capacitors within, but not resistors (like the Muratas). Someone chime up if you it may be otherwise.

A lot of the SX-based schematics I see (and that I build) usually place a 10k or so resistor between OSC1 and OSC2 (across the outside pins of the resonator). This value seems to work for 20MHZ and 50MHZ, and doesn't seem to negatively affect circuits where it might not be required. Guenther has more to say about this if you poke around the forums.

The SX datasheet has resistor and capacitor values that are theoretically required for proper resonator startup. The small surface mount resonators do not include caps, the big dip ones usually do.

This may not be it at all, of course, but it may be worth looking at. Certainly something that could be soldered to the resonator pads on the bottom of your board.

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