Quote Originally Posted by abdy37 View Post
My project is PIC to PC and PC to PIC communication. I mean FuLL Duplex channel between them. But to communicate with PC I must have digital values and not analog. That is why I want to use ADC feature of PIC 18F2455. I want to observe if I get those digital values from PORTA.1 bit by bit. This is exactly what I want to do.
So what you're saying is that you want your PC to talk to your PIC, bidirectionally.
What port do you want to use on the PC to do this? The speaker/microphone port?
You know there's fully functional serial port on the PIC18F2455, as well as most others, that is easily used to communicate with a PC, with a little bit of extra hardware. See the PBP book for more details...