I am experimenting with an ATtiny85, running a simple blink program written in C.
I noticed the output having an overshoot of 2V, followed by an undershoot of 1.5V and some ringing.
Is that normal?
Power decouple cap 100nF (85.6nF measured), load 3mA (1k resistor and a red led).
I already tried changing the load, changing the output pin, changing the chip, removing all connections as much as possible, adding an elco of 10uF for extra decoupling.