The bigger PIC has tons of nice functions and these needs to be disabled/enabled/taken care of/set up/deactivated......etc
So tell us what you have connected where and all your regiter settings.. TRIS ADCON etc if you think your code it too big/secret to post here.
But if you insist of doing a 2 pic project feel free. And if you do that.. why use serial communication when it should be enough to use 2 pins as input on the small pic... as long pin-xx is high rotate left, if pin-yy is high rotate right...
but... naaah.... if you already have code working for a small pic... what PIC is that? It cant be a 16F84 since that has no A/D....
the plot thickens
/me




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