>What do you think I might have to watch out for? Will the assembly
>code for the 16F device work straight away on the 18F device?

I haven't done any 16 to 18 series conversions, but my understanding is the 
answer is "Depends". If you have written the code so that it is designed for 
conversion, possibly using an environment like Olins where the macros take 
care of many of the differences, then the conversion should be straight 
forward.

>And can I just replace the 16F device with the 18F device in my circuit?

>From what you have already said about pinout, it sounds like it should be 
straight forward. However any pin where you looked carefully at voltage 
levels or current capability will need the same scrutiny again.

>Anything that needs to be configured differently?

The 18 series do have a more comprehensive config word selection. Also I 
imagine one of the reasons for doing the change is to make use of the 
hardware multiply instruction to reduce execution times. If this is not the 
case, I winder why you are looking at the conversion.

I believe Microchip do have an application note on converting from 16 to 18 
series. IIRC it is pretty old, and dealt with 16C to 18C, but much of it 
should be relevant. 

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