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

An external oscillator module will drive the SX with no problem. Just hook the oscillator output to the OSC1 input. One detail is that if you are using the SX key, then you must take precautions because the SX key generates a 12V programming voltage on pin OSC1. Either unplug the oscillator module when using the SX key or put some protection circuitry (resitors, zeners, etc....) .

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