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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.
@sebi
After further analysis it seems the spikes on N51-RC-LDO in this post on GitHub are not as erratic as I thought:
Those are 4s interval spikes and are certainly due to the clock calibration involved when using the internal low-frequency RC oscillator (as there is no such spikes when enabling the external low-frequency 32.768kHz crystal) (see N51-XTAL-LDO).
Thus the 8s interval spikes on the nRF52832 might be due to clock calibration as well (at half the frequency though). As the Puck.js is not equipped with an external low-frequency 32,768kHz crystal, I cannot enable it and thus clock calibration is mandatory.