>-----Original Message-----
>From: al smith [mailto:micro_eng2@HOTMAIL.COM]
>Sent: 22 June 2004 13:36
>To: PICLIST@MITVMA.MIT.EDU
>Subject: [PIC]:F877 to 18F? (more I/O)
>
>
>I've outgrown the I/O on the F877 (yes I know i can expand it
>using I2C) so I am looking at the next size up.  Looks as if
>the 18F6525 might be a good choice...comments?

I would not hesitate to move onto the 18F series whilst you have the chance.
They are better in virtualy every respect (apart from perhaps price).  The
18F6525 is a newer device that (hopefully) doesn't suffer from the problems
of the first generation parts and gives a good increase in I/O and
peripherals.

There are a couple of things to watch for. One that I found annoying is the
much lower input impedance of the A/D peripheral, a maximum source impedance
of just 2.5K is recommended, compared to 10K for the 16F parts.  Some of the
SFR names have changed slightly as well, usualy because there is more than
one of the peripheral that it refers to.

Regards

Mike




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