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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.
@Kartman
hah! I just had a quick read of the datasheet and I think you're right - I didn't see any means of varying the cpu clock. I had expected the nrf52 would've had a pll like most other ARM devices.