I am using a K65 tower eval board where I have a clipped sine-wave oscillator that has about 1 volt peak to peak. I feed that into a 1000 capacitor and then an invertor whose output feeds back through a 1 meg resistor to the input.
The resulting output is a 3 volt peak to peak square-wave as would be expected. As soon as it is feed into the ext osc in pin, the square-wave is distorted (almost positively saturated).
Do I have something configured incorrectly?