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

Jon,

I was looking through the reference document and it looks like it does the voltage interfacing for you.  That is probably not an issue.  And, my suggestion of stepping through to verify the data transfer won't work since you are seeing a difference with and without the SX Key.

If the device and the SX operate correctly with the SX key, then it would seem like the difference would be the oscillator as you suspect.  That would affect all of the calculations the compiler makes for the timing of the SHIFTxx commands.  Can you verify that the oscillator matches what the code says - i.e., are you installing a 4 MHz oscillator?

Joe

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