I measured the Vpeak-peak of VDD which is the first channel: Vpeak-peak is 0,1V
The second channel ist XRES, 3rd is SWDCK, 4th is SWDIO.
I soldered a 100nF between VDD and GND near the MiniProg3 connector. Now it works.
Thank you very much!
The point of the decoupling is that it has to be small, not large, because Miniprog3
has limitations ramping voltage. Not intuitive as most people would, rightfully,
put a bulk tant or electrolytic as well as a ceramic on Vdd on board.
You might file a CASE and ask what that limitation is, and post back here.
I cannot find it mentioned in Miniprog3 manual. I am quite sure there was
a limitation on the Minprog1.
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