16f877A V 18F4550

[comwarrior]

thanks for that darrel...

Actually, i currently have no plans to use the USB nor the USARTs but i may do at some point...

i'm actually only using two ADC's in my curent project, however, i do have plans to use them all so the extra 5 will come in handy...
The anoying thing is the extra ADC's are on a port i'm using for an LCD.. looks like it'll have to be moved...

Thanks

[MyBuddy]

I've found many. It would be tedious to list all the pin differences. Basically, don't try to drop this chip into an 877 circuit unless you want to redesign the layout. I'm a beginner, and I found that out the hard way. Bleh.

Here's what got me most:

Port C pins 4 and 5 are digital input ONLY, and on reset they are normally disabled. Unless, that is, the USB module and USB tranciever are disabled.