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???
04/20/07 15:50
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 		 #137651 - Answer is incorrectlystated!
Responding to: ???'s previous message
Lynn Reed said:
The only (sic)way to connect external devices to the 8051 is to use MMIO

As stated, that is Not True!

There are many ways other than MMIO in which external devices can be connected to the 8051 - Erik gave a few examples:
http://www.8052.com/forum/read.phtml?id=137643

and access it through the MOVX instructions.

If you had a read-only peripheral (eg, some DIP switches), you could map it into CODE space and access it through the MOVC instruction.

Maybe what you meant to say was, "The only way to access Memory-Mapped peripherals on the 8051 is through the MOVX (or MOVC) instructions"...?




List of 36 messages in thread
TopicAuthorDate
MMIO            01/01/70 00:00      
   MMIO            01/01/70 00:00      
      The only way? I know, at least, 5 more            01/01/70 00:00      
         careful now ...            01/01/70 00:00      
            well            01/01/70 00:00      
               true enough!            01/01/70 00:00      
      Answer is incorrectlystated!            01/01/70 00:00      
      8051 offers more connection points            01/01/70 00:00      
         true, but he didn't ask about that            01/01/70 00:00      
            But Lynn said it, and it's wrong            01/01/70 00:00      
               I\'m forced to agree ... it is wrong ... but ...            01/01/70 00:00      
         That\\\'s already been thoroughly established!            01/01/70 00:00      
            Regret on the word "only"            01/01/70 00:00      
               n ow I have to TOTALLY disagree            01/01/70 00:00      
               Lynn, I KNEW Erik would jump you on this one!            01/01/70 00:00      
                  you missed the biggie            01/01/70 00:00      
                     He didn't ask for ancient or modern, just answers            01/01/70 00:00      
                        as I said            01/01/70 00:00      
   What are you trying to connect?            01/01/70 00:00      
   Ambiguity?            01/01/70 00:00      
      oh my            01/01/70 00:00      
         error?            01/01/70 00:00      
            8051 addressing is not segmented            01/01/70 00:00      
         Oh dear!            01/01/70 00:00      
            you missed the POINT            01/01/70 00:00      
               no, YOU did            01/01/70 00:00      
               try not to confuse beginners...            01/01/70 00:00      
               You failed to make that point!            01/01/70 00:00      
         useful? I'd say confusing            01/01/70 00:00      
         Mike, you didn't read the 8086 datasheet either            01/01/70 00:00      
   Hardware conections            01/01/70 00:00      
      Hardware conections...            01/01/70 00:00      
      an example...            01/01/70 00:00      
      trying to 'relanguage'            01/01/70 00:00      
   MMIO meaning            01/01/70 00:00      

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