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

Hello Stef,

Even if it is working with the clock generated from the SX-Key there could be a problem with the layout at 50Mhz.  When the key is plugged in it is extending those traces a bit on the OCS lines and will change things slightly.  Does your program require a 50Mhz speed or can it run fine at 20Mhz?  The lower the clock speed the more you can get away with on your board as it is more forgiving.

I've seen a few schematics where a small (around 5pf) cap was placed from one of the resonator lines to the center ground lead.  That may also help.  Not all the resonators seem to be created equal so you may want to swap it out with another one or perhaps try a different brand to see if that helps.

Robert

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