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???
06/15/07 08:50
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 		 #140826 - disassembler
Responding to: ???'s previous message
Nimish Dave said:
DTPR is used to point these bytes.Is there another way to acess this bytes.

This is fully explained in the "bible". In the "biblical"
51, code memory can be accessed only using movc instructions, of which there are two: movc a,@a+pc, and movc a,@a+dptr.

However, there are "data" in the fetched code, too: the parameters of instructions. For example, if you have:
Save This Code
0030:   24 03     add  a,#03h
and you set PC wrong (e.g. by LJMP 0031h), the '51 core will execute a RR A (its opcode is 03).


Nimish Dave said:
Another problem is that when we try to read the bytes in between wrong mnemonics is shown.What can be the solution.


Use a good disassembler where you can control which part of the binary will be treated as code and which as data (and what kind of data it is).
By far the best you can get for '51 is Jeff Post's d52, just a click away from here (look at the column at the left).

JW


List of 53 messages in thread
TopicAuthorDate
Data or Instruction            01/01/70 00:00      
   Context            01/01/70 00:00      
   It does not and it cannot.            01/01/70 00:00      
      Solution            01/01/70 00:00      
         disassembler            01/01/70 00:00      
         have fun            01/01/70 00:00      
            Erase error            01/01/70 00:00      
               yes            01/01/70 00:00      
                  Certain Error            01/01/70 00:00      
                     Why?            01/01/70 00:00      
                     why?            01/01/70 00:00      
                        Why!            01/01/70 00:00      
                        Because            01/01/70 00:00      
                           what I meant by garbage...            01/01/70 00:00      
                           A single byte isn't garbage.            01/01/70 00:00      
                           D52 is open-source, isn\'t it?            01/01/70 00:00      
                              Concept of Pocket Programmer            01/01/70 00:00      
                                 well, if not            01/01/70 00:00      
                                 hummmmm....            01/01/70 00:00      
               Strictly speaking...            01/01/70 00:00      
                  @Erik            01/01/70 00:00      
                     that, in my opinion, is crazy            01/01/70 00:00      
                        It is crazy            01/01/70 00:00      
                           Eh??            01/01/70 00:00      
                              Computer here is PC (personal computer)            01/01/70 00:00      
                                 So what is the microcontroller?            01/01/70 00:00      
                        this depends on definition of "computer"...            01/01/70 00:00      
                        Here we go again ...            01/01/70 00:00      
                           beginner\'s guide to D52            01/01/70 00:00      
                           There you go again!            01/01/70 00:00      
                              Andy            01/01/70 00:00      
                                 There's always tomorrow...            01/01/70 00:00      
                                    Different application            01/01/70 00:00      
                                       Code re-use            01/01/70 00:00      
                                          the no-tool approach            01/01/70 00:00      
                                             Cell phone ?            01/01/70 00:00      
                                                PDA cellphone            01/01/70 00:00      
                                                I don't think that would be necessary...            01/01/70 00:00      
                                          Near to Cell phone            01/01/70 00:00      
                                       There are multiple ways in which to use the code            01/01/70 00:00      
                                       Still primitive            01/01/70 00:00      
                                          Good for you!            01/01/70 00:00      
                                             for displaying just 2 lines of 16 characters...            01/01/70 00:00      
                              What I mean is ...            01/01/70 00:00      
                                 Nobody did that?            01/01/70 00:00      
                                    Where you sit determines what you see            01/01/70 00:00      
                           more appropriate solutions?            01/01/70 00:00      
                              sometimes it's necessary to point out the obvious            01/01/70 00:00      
                              Another one:            01/01/70 00:00      
   It worked            01/01/70 00:00      
      Oooooh....            01/01/70 00:00      
         Sure            01/01/70 00:00      
            have a look at this!            01/01/70 00:00      

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