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

What PJMonty said.

But you can test to see *where* things are breaking down -- I would try changing your freq and osc directives to use the internal RC oscillator. (4_000_000 and OSC4MHZ). Then see if the program runs without the key connected and without a resonator/crystal in place.

If it works, then you know you've got a freq/resonator/key conflict... try it again with 50_000_000 and OSCHS2, then run again without the key connected and *with* a 50mhz resonator in place. Also, do you have a 10k or so resistor connected beween osc1 and osc2 (the resistor is generally a good idea to startup the resonator properly -- see the SX datasheet. The big ceramic DIP resonators already have the caps  inside them, small surface mount resonators do not).

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