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

Just throwing some ideas out there:
  How long are the leads/tracks from the SX to the resonator ?
  Do you have one of the thru-hole 50 MHz resonators you can try ?
  When you do have the scope probe on the osc pin, does the waveform change when you spray the SX with cold spray ?

  This is a real stumper, usually changing the OSC setting or using the brown-out setting fixes most startup problems.

Bean.

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