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

0.1uF are WAY too big. Try 10 pF to 100 pF.

Different value caps will offset the crystal frequency. 

You would need a calibrated frequency counter to be able to know how much the caps are pulling the frequency.

Try different OSCxxx settings on the device line too.

Bean.

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