It seems very simple and yet it is a design I have never seen before as an official design.
Edit: I adjusted the way the components are laid out in the schematic and now it looks something like a highly reduced Colpitts oscillator.
Edit2: This turns out to be a Pierce oscillator. I wasn’t very familiar with it so I didn’t recognize it and in the schematics it shows a crystal instead of an inductor and a NOT gate symbol instead of the transistor-resistor NOT gate here.
