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09/27/12 13:22
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#188474 - AT89C51RC vs. AT89C51RC2
Not sure if anyone has this kind of info (may have to go back to Atmel for it, or spend a lot more time looking thru my program and device specs to figure it out :(

I am working on a design that uses the AT89C51RC. I've had a prototype up and running and seemed to be working fine. I got a couple of AT89C51RC2 devices (superset of AT89C51RC w/PCA, X2 clock, ISP FLASH programming, etc.) from Atmel. I thought I would be able to just plug and play with the 'RC2, but the program does not work. I've swapped in and out a number of other 8XC51 devices and all seem to function as expected except the 'RC2. BTW - I'm currently using external program memory until I finalize the code.

I'm wondering if anyone is familiar with this device and could offer any suggestions about why this would happen. I figure my program may assume something about the initial state of the '51 that may not be true for the 'RC2 version (or I've accidentally written a bit into an SFR that would normally be "don't care" but the 'RC2 may actually care a lot :(

Thanks in advance for any help offered.


List of 9 messages in thread
AT89C51RC vs. AT89C51RC2      Steph Ru      09/27/12 13:22      
   set the 12 clock bit      Erik Malund      09/27/12 14:10      
      AT89C51RC vs. AT89C51RC2      Steph Ru      09/27/12 20:22      
   AT89C51RC vs. AT89C51RC2...SOLVED      Steph Ru      09/27/12 21:27      
   AT89LP51RB2/RC2/IC2      Jim Granville      09/28/12 00:00      
      AT89LP51RB2/RC2/IC2      Steph Ru      09/28/12 16:02      
      if so      Erik Malund      09/28/12 20:30      
         Of course, consider all parts that fit      Jim Granville      09/29/12 00:02      
   you can get answer from one document      Zhao Donglin      09/29/12 03:01      

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