I have a PWM input to a PIC16c84 chip.  When I look at the PWM signal
from the device, not connected to PIC, it has a nice 0 to 5V signal.
When I connect to PIC it has a 4.5 to 5V signal. This causes a problem
because the pic always recognizes it as a high signal.  I am guessing
that the inherent capacitance on the input to the chip does not have
enough time to fully discharge.

Does anyone know or can direct me to a source to solve this problem

Thank You.

John .