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

Just adding:
 

The internal oscillator has a max of 4Mhz.  If you want anything more than that, then you will need an external oscillator.

 

Make sure you have a 'disconnect' in your circuit (jumpers) for when you need to program the SX.  If you are using an external oscillator it must not be connected when you program your chip because it will interfere with the program download.

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