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

As you obviously know, the OSC2 signal is the problem. I am nearly certain that the OSC2 is used by the SX-Key as a return signal from the SX. Have you tested the continuity of the trace between the OSC2 pin on the SX-Key header and the OSC2 pin on the SX? What else besides the resonator is connected to the OSC2 line? Are you using a parallel resistor between OSC1 and OSC2?

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