Beware!  The 4520 has a SERIOUS bug in the SPI interface.

  *
  |  __O    Thomas C. Sefranek  tcs@cmcorp.com
  |_-\<,_   Amateur Radio Operator: WA1RHP
  (*)/ (*)  Bicycle mobile on 145.41MHz PL74.4
 
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-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
Bob J
Sent: Wednesday, February 08, 2006 10:41 AM
To: Microcontroller discussion list - Public.
Subject: [PIC] 18F4520 RA4 question

I'm about to migrate a project from a 452 to the 4520.  While comparing the
datasheets I noticed that RA4 on the 452 is shown as being "open drain when
configured as output", but on the 4520 it is never mentioned that RA4 is
also open drain.  In my board design I have the anode of an LED connected to
RA4 with the cathode connected to +5V via a 1K resistor, so I will have to
reverse it and change my code, very easy to do but I was under the
impression that the 4520 was pin-compatible with the 452.  Is this not the
case?

Regards,
Bob
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