>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 02 April 2006 04:59
>To: piclist@mit.edu
>Subject: RE: PIC16F84 to PIC16F628A
>
>
>
>The 16F628A is a direct replacement in that it is pin 
>compatible with the 16F84 and is intended to fill the slot the 
>16F84 took.  That the 16F628 has more features doesn't mean 
>anything; replacements often do have more features.  So what?  
>The 16F628 will do exactly everything the 16F84 did. 
>Any code written for the 16F84 will run on the 16F628, with 
>the two instruction addition of turning off the analog functions.

It's not a replacement, as you can still buy the 16F84, even though it's more expensive.  Saying that the only difference in code required is two extra instructions is misleading. Of the top of my head the configuration fuses are different as is the first GPR address which is important for anyone using assembler and using absolute mode, as many beginners seem to.  There are also GPR's in the first three banks, whereas the 16F84 has the GPRs mirrored in the first two banks, this could easily stop any code working that relied on this behaviour.  Most of these won't be a problem with a HLL, but they are important differences nonetheless.

Regards

Mike

=======================================================================
This e-mail is intended for the person it is addressed to only. The
information contained in it may be confidential and/or protected by
law. If you are not the intended recipient of this message, you must
not make any use of this information, or copy or show it to any
person. Please contact us immediately to tell us that you have
received this e-mail, and return the original to us. Any use,
forwarding, printing or copying of this message is strictly prohibited.
No part of this message can be considered a request for goods or
services.
=======================================================================

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist