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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@AntiCat
According to http://www.espruino.com/Clocks the Watch Crystal will automatically be detected and used.
I don't have an oscilloscope or a frequency counter.
Is there any way to verify that the Espruino did indeed switch to the crystal like a function that prints the status?