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03/26/06 15:26
Modified:
  03/26/06 15:44
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 		 #113129 - decoding in practice
Responding to: ???'s previous message
Richard Erlacher said:
You said it provides the decoding. It does not. It provides direct access to the flash. There are MCU's that provide chip-selects, and THAT's decoding.



Absolutely no !

Decoding means, I can access every peripheral, which I want.

E.g. on one project I connected the SJA1000 and the LAN91C96 as memory mapped IO without any additional chip to the AT89C52.
The solution was easy, simple use P2.0 as chip select for the one and P2.1 for the other.

Only on very big projects, where the address range was limited, a full decoding may be needed.


Please think practical, not theoretical.


Peter



List of 58 messages in thread
TopicAuthorDate
How to decoder the memory address?            01/01/70 00:00      
   decoding already inside            01/01/70 00:00      
      That's not fair!            01/01/70 00:00      
         ???            01/01/70 00:00      
            Maybe unfair was the wrong way to put it            01/01/70 00:00      
               why Flash esoteric ???            01/01/70 00:00      
                  So ... where's the decoding?            01/01/70 00:00      
                     decoding in practice            01/01/70 00:00      
                        This is not a personal attack, Peter            01/01/70 00:00      
                           actually            01/01/70 00:00      
                              I don't disagree            01/01/70 00:00      
                                 hardly            01/01/70 00:00      
                                    what he asked was:            01/01/70 00:00      
                           R. E            01/01/70 00:00      
                              Not exactly            01/01/70 00:00      
                                  Sorry Richard I was a little more            01/01/70 00:00      
                              there is an ignore function available            01/01/70 00:00      
                                 that is how I currently do it            01/01/70 00:00      
                                    drop the flat mode, go threaded            01/01/70 00:00      
   There's a way, once you've decided            01/01/70 00:00      
   The first step            01/01/70 00:00      
      Requirements, a most important variable            01/01/70 00:00      
         I'm not a machine            01/01/70 00:00      
   RE: How to decoder the memory address?            01/01/70 00:00      
      it's bible time            01/01/70 00:00      
   Don't look bad each others please            01/01/70 00:00      
      74HC138            01/01/70 00:00      
      why do you refuse to read "the bible"            01/01/70 00:00      
         What chapter will answer his question?            01/01/70 00:00      
            I never answer that            01/01/70 00:00      
               Who's joy? Yours??            01/01/70 00:00      
                  places "the bible"            01/01/70 00:00      
                     Just answer the question            01/01/70 00:00      
                        then why did you not give him an answer            01/01/70 00:00      
                           because I'm just as bad as you, Erik            01/01/70 00:00      
         Not this time            01/01/70 00:00      
            You're right, and he knows it            01/01/70 00:00      
      Interesting link            01/01/70 00:00      
      Example            01/01/70 00:00      
      questions, guesses and comments            01/01/70 00:00      
         Now, was that so hard?            01/01/70 00:00      
            silliness was never here            01/01/70 00:00      
               Well, perhaps not, but ...            01/01/70 00:00      
                  So when?            01/01/70 00:00      
      RE: Don't look bad each others please            01/01/70 00:00      
   Don't look bad each others please            01/01/70 00:00      
   I do not understand            01/01/70 00:00      
   Addressing 101            01/01/70 00:00      
   Why using this processor pins left...?            01/01/70 00:00      
      What chips?            01/01/70 00:00      
      What is the problem?            01/01/70 00:00      
         Explaination            01/01/70 00:00      
            I just remembered 22V10            01/01/70 00:00      
            Be careful            01/01/70 00:00      
               How many address buses do you see?            01/01/70 00:00      
                  On the busses            01/01/70 00:00      
                     The only purpose was...            01/01/70 00:00      
                        The question has been well addressed            01/01/70 00:00      

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