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???
05/19/07 13:45
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 		 #139511 - confirming Andys statement
Responding to: ???'s previous message
Richard Erlacher said:
If it's not in code space, it will be volatile.

Andy Neil replied
No, that's not necessarily true.

You're assuming that XDATA is always and only non- volatile - but there's no reason why you can't have ROM (or part of a ROM) addressed in XDATA space.

I'm sure the 'non' is a typo

I have, in one case, 2Mbyte of Flash that can not be written (except through a command sequence), in XDATA space.

Erik



List of 43 messages in thread
TopicAuthorDate
How to speed code?            01/01/70 00:00      
   How did you come to that bizarre idea...            01/01/70 00:00      
      bizarre!?            01/01/70 00:00      
         I am a C-hater, remember...            01/01/70 00:00      
      Smaller, Faster            01/01/70 00:00      
   Is that true??            01/01/70 00:00      
   Often mutually exclusive...            01/01/70 00:00      
   Take my contribution with a grain of salt.            01/01/70 00:00      
      http://www.8052.com/users/disasm/            01/01/70 00:00      
   what compiler?            01/01/70 00:00      
   Data types            01/01/70 00:00      
   Getting the least            01/01/70 00:00      
   My Two Cents            01/01/70 00:00      
      Turn in your Programmer's ID Card.            01/01/70 00:00      
         heheh...yeah            01/01/70 00:00      
         SJMP            01/01/70 00:00      
   Comments            01/01/70 00:00      
   How to speed code?            01/01/70 00:00      
   a couple of \'rules\'            01/01/70 00:00      
      More on Erik's Rules            01/01/70 00:00      
         a comment            01/01/70 00:00      
         PDATA            01/01/70 00:00      
            don't forget about @DPTR access to CDATA            01/01/70 00:00      
               but            01/01/70 00:00      
                  WHAT??? You mean I have it too? Dystypia?            01/01/70 00:00      
                     Enginnering is all about the tradeoffs            01/01/70 00:00      
                        two places where you REALLY can make an impact            01/01/70 00:00      
                           b) buffer at 256 byte boundary            01/01/70 00:00      
                              Alignment            01/01/70 00:00      
                              you did'nt hear ?            01/01/70 00:00      
               Another \"but\"            01/01/70 00:00      
                  it is, after all, quicker            01/01/70 00:00      
                     Errr...            01/01/70 00:00      
                        perhaps, but it has to "live" somewhere.            01/01/70 00:00      
                           You\'re assuming...            01/01/70 00:00      
                              confirming Andys statement            01/01/70 00:00      
                                 We WERE discusisng 805x ...            01/01/70 00:00      
                                    well, does it not?            01/01/70 00:00      
                                       Tables in code space vs data space            01/01/70 00:00      
                                          Philps XA, the best "16 bit '51"            01/01/70 00:00      
                                             Maxim/Dallas DS89C450            01/01/70 00:00      
   most compilers            01/01/70 00:00      
      Thanks            01/01/70 00:00      

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