I have used both on the same PC board, NO port changes I noticed.
The SPI device is brain dead in the 4520.

Wouter van Ooijen wrote:

>I was looking at some PIC pinouts for a new product. I would like to
>accomodate 16F877(A), 18F452 and 18F4520. To my horros I saw that the
>I/O pins of the 18F452 and 18F4520 are different: 18F452 has a full port
>D, 18F4520 has a full port A! Yet the migration document does not seem
>to mention this at all. 
>
>Can anyone with 18F452->18F4520 migration experience comment on this?
>
>Wouter van Ooijen
>
>-- -------------------------------------------
>Van Ooijen Technische Informatica: www.voti.nl
>consultancy, development, PICmicro products
>docent Hogeschool van Utrecht: www.voti.nl/hvu
> 
>
>  
>

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  |  __O    Thomas C. Sefranek   WA1RHP@ARRL.net
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