Renzo,
some differences between 16F84 and 16F628 are descibed also in this tutorial:

http://www.amqrp.org/elmer160/lessons/index.html


--> (see page 9 of APPENDIX "A")


ciao
Marco


---------- Initial Header -----------

>From      : piclist-bounces@mit.edu
To          : piclist@mit.edu
Cc          : 
Date      : Mon, 04 Sep 2006 14:31:59 +0200
Subject : [PIC] 16f84a vs 16f628a







> I have a circuit, mainly a counter, with Led display driven by a 
> 16F84a that runs perfectly.
> I changed the chip with a 16F628A , no change in the circuit I only 
> replaced in the program the RAM beginning with 20h instead of 0Ch and 
> of course processor and include file..
> Now to start I have to momentary ground Rb0 and Rb4 never change.
> 
> There are any other replacement to do? There is some article that 
> deal with this problem?
> Thanks
> Renzo Giurini
> 
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