>I do not know how to cause an interrupt on a pin change.
> -- 
> ..::[ solarwind ]::..
> -- 

As I posted in my other reply - get a demo type board and get some code up 
and running.

Don't try and run with PIC programming before you can walk or you'll end up 
tripping over.

I use predominantly 18F1320 for development and they are good processors to 
start with / learn on.

Taken from the 18F1320 datasheet on page 87 ish:

9.8 PORTB Interrupt-on-Change
An input change on PORTB<7:4> sets flag bit, RBIF
(INTCON<0>). The interrupt can be enabled/disabled
by setting/clearing enable bit, RBIE (INTCON<3>).
Interrupt priority for PORTB interrupt-on-change is
determined by the value contained in the interrupt
priority bit, RBIP (INTCON2<0>).



If the above confuddles you then definitely get yourself a demo/development 
board and start from the beginning. Within a few hours of programming and 
demo code you will pick up what the above it talking about.

Dom 

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