Did you turn off the analog comparators? TTYL

> I am having a problem with a 16F628 driving an LCD.
>
> The program uses portB driving a 16207H LCD panel using a 4 bit interface.
> The same code works perfectly in a 16C84 in the same circuit.
>
> A program dump from the 628 chip shows correct code in the chip.  Several
> different chips all show the same symptoms.
>
> I have looked at the signals with a scope and find that the RB7 pin (busy
> flag from the LCD) is oscillating 4 MHZ at 1 volt with a sawtooth
> waveformm
> whether connected to the LCD or not.
>
> I've tried pullups, pulldowns, capacitor filtering all with no effect.
>
> A test using the port as output only (a simple walking 1 output program)
> works fine.

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