PIC18F8720 PORTD problem

[skimask]

I found the problem! So surprising enough, PORTD needs to be driven at more current, I replaced the 10K resistor arrays with 1.5K resistor and now it seems to be working fine. But really these CMOS inputs should not need this much current. Just thought you guys would be curious. Thanks!

....which is why mr_e suggested posting a schematic or something like it back in post #4....

[mister_e]

and 18Fs are actually a bit much noise sensitive than 16Fs.

10K to 1.5k seems a big jump, but if this working...

100K - 1M internal Pull-up, are better than this. Not something i would use/trust myself in a noisy environment 100000 X

Now, maybe i'm wrong, i didn't read the whole thing once again, but it might be caused by a Read-Write-Modify thingy.

General 18Fs rules, You write to PORTx, you read from LATx.

[T.Jackson]

I have a commercial serial IO controller KIT out there using 100K's for pull ups.
Project uses a 16f877a - no probs reported at all.