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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.
@Kaoron
This is the datasheet for what seems to be an earlier iteration of the same chip architecture. Register addresses are not accurate and some are missing, but it looks overall closer to the 3603 than the 3605, 3300 or 3313 and provides a bit more info.
Edit : scratch that, it's basically the same as the 3313.
http://www.synercontech.com/Public/uploads/file/2019_10/20191020152311_81180.pdf