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???
04/22/07 06:59
Modified:
  04/22/07 07:30
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 		 #137750 - That\\\'s already been thoroughly established!
Responding to: ???'s previous message
Mike Stegmaier said:
Lynn Reed said:
The only way to connect external devices to the 8051 is to use MMIO, and access it through the MOVX instructions.

You forgot about the PORTS!

Mike,

That has already been thoroughly established in http://www.8052.com/forum/read.phtml?id=137643 and http://www.8052.com/forum/read.phtml?id=137651 and http://www.8052.com/forum/read.phtml?id=137660

You can connect devices to ports P3 and P1 as well.

And now you're forgetting all the other possibilities!
See http://www.8052.com/forum/read.phtml?id=137643

Plus, if you're not using the external memory interface, P0 and P2 are also free for use!
And, if you have a derivative with >4 ports, they can also be used!

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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