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???
08/09/07 09:31
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 		 #142966 - IDATA and DATA
Responding to: ???'s previous message
Jan Waclawek said:
all the lower area is direct addressable (00-7F) "data", the upper area (80-FF) is indirect addressable ("idata").

Note that 00-7F are also indirectly addressable; ie IDATA addresses 00-7F overlap DATA addresses 00-7F.

In other words:

  • 00-7F are addressable as both DATA and IDATA;
  • 80-FF are addressable as IDATA only.



    • List of 41 messages in thread
    TopicAuthorDate
    keil - program and data size            01/01/70 00:00      
       Check file.M51            01/01/70 00:00      
          Linker Listing aka "Map" file            01/01/70 00:00      
             another question            01/01/70 00:00      
                8051 memory map            01/01/70 00:00      
                   Keil documentation            01/01/70 00:00      
                   AT89C51RD2            01/01/70 00:00      
                      a '51-specific buzzword: scratchpad RAM            01/01/70 00:00      
                         idata is in small or compact???            01/01/70 00:00      
                            Neither!            01/01/70 00:00      
                               1. where is a "idata(128-255bytes)" in the string?            01/01/70 00:00      
                            As previously advised - look in the Map File            01/01/70 00:00      
                               i understood            01/01/70 00:00      
                         IDATA and DATA            01/01/70 00:00      
                            it is correct            01/01/70 00:00      
                            my take            01/01/70 00:00      
                Pardon?            01/01/70 00:00      
                   excuse me on my ENGLISH....            01/01/70 00:00      
                      What request?            01/01/70 00:00      
                         message suggests this            01/01/70 00:00      
                            I see no such suggestion there            01/01/70 00:00      
                               keil RECOMENDS            01/01/70 00:00      
                                  Where?            01/01/70 00:00      
                                     ok            01/01/70 00:00      
                                        These questions have all been answered            01/01/70 00:00      
                                           thank, but....            01/01/70 00:00      
                                              Oh yes you have!            01/01/70 00:00      
                                                 more thanks........ :-))))))))))            01/01/70 00:00      
                                        Overinterpretation ?            01/01/70 00:00      
                                           yet            01/01/70 00:00      
                                              Linker listing file.            01/01/70 00:00      
                                                 keil-128, at89c51rd2-256            01/01/70 00:00      
                                                    More misinterpretation            01/01/70 00:00      
                                                       ok, thnx            01/01/70 00:00      
                            I'm confused!            01/01/70 00:00      
                               q            01/01/70 00:00      
                                  attempt to a            01/01/70 00:00      
                                     previous A            01/01/70 00:00      
                                        I know I was repeating what I've read in your post            01/01/70 00:00      
                               Confusion            01/01/70 00:00      
       reply            01/01/70 00:00      

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