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

I noticed that if I did not use the 1M ohm resistor the OSC1 and OSC2 pins should not be touched during runtime.
Or else the SX will go crazy.  

However, if the 1M resistor is used, the SX is less sensitive to finger touches on the program header pins.

Also, if the 1M resistor is used, the resonator can be placed further away than normally allowed.

But of course you should place the resonator as close as possible to the SX.  This is most important.

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