Henrik,

I appreciate it. I've been looking at the datasheet and it's starting to make more sense. I'm not a programmer or circuit designer but am having to learn as this falls under the "other duties as deemed necessary" in the job description and the original guy who did it is no longer available.

So I think I now understand the physical input. Let's say I want to see an incoming serial message on pin RC7 (RX1 pin) and interrupt the home routine. I would need to first trigger RB0 to interrupt and goto the interrupt routine to read the serial data? Am I thinking correctly?

Second question. How do I set up software interrupts? Like if a certain value occurs like 3 I/O's are turned on then I want a variable like "AllON = 1" to interrupt the routine and do something.
Thank you,
Hylan