Let start over. Exactly how often do you need an external interrupt for your project?
An oscillator such as you attempted produces an AC signal, not a digital 0 and +3.3 signal.
We can help if you are specific.
Paul
Let start over. Exactly how often do you need an external interrupt for your project?
An oscillator such as you attempted produces an AC signal, not a digital 0 and +3.3 signal.
We can help if you are specific.
Paul