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???
04/29/08 09:58
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#154168 - problem with unassigned SFR address
All other addresses in the SFR range (80h through FFh) are considered invalid. Writing to or reading from these registers may produce undefined values orbehavior.
see it here(http://www.8052.com/tutsfr.phtml),just under the chart

and this is my question : isn't real RAM? or why can't it been accessed ?

List of 6 messages in thread
TopicAuthorDate
problem with unassigned SFR address            01/01/70 00:00      
   Undefined            01/01/70 00:00      
      appreciated!            01/01/70 00:00      
         That's just the way it is!            01/01/70 00:00      
            the one thing is that ....            01/01/70 00:00      
               Unassigned SFR addresses            01/01/70 00:00      

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