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???
11/16/05 16:47
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 		 #103811 - why not?
Responding to: ???'s previous message
Erik Malund said:
The '51 is a Harvard device (separate code and data memory, you can not have code in the RAM.

Why not? The havard nature of it does not exclude RAM as a specific memory holding the program, being accessed as a code memory, either integrated on-chip, or external. Some '51 derivatives do allow to use integrated RAM to be used for both MOVX and code fetch.

However, if you are referring to "RAM" as the directly and the indirectly addressable memory of the '51 core, then that's another issue... I doubt anybody sane would like to use 256 bytes for registers, data, stack and program at the same time... But I would not call that one a "harvard", rather a "'51" architecture, being rather peculiar with more than 2 memory spaces overlapping...

Jan Waclawek


List of 50 messages in thread
TopicAuthorDate
8051/8052 development boards for newbies            01/01/70 00:00      
   SiLabs            01/01/70 00:00      
   80c552 board from Tecel, Inc.            01/01/70 00:00      
      ROM Monitor?            01/01/70 00:00      
      uPSD3200            01/01/70 00:00      
         uPSD 32xx            01/01/70 00:00      
            prjc board            01/01/70 00:00      
               I suggest SILabs f12x devboard            01/01/70 00:00      
                  SiLabs f12x            01/01/70 00:00      
                     yes            01/01/70 00:00      
               PJRC            01/01/70 00:00      
   8052.com SBC            01/01/70 00:00      
      no offense, but since the 8052 SBC does            01/01/70 00:00      
         Counterpoint            01/01/70 00:00      
            I have always either worked alone or for            01/01/70 00:00      
         ICE?            01/01/70 00:00      
   The ADuC814 board in the store            01/01/70 00:00      
      clarifications..(SiLabs f12x dev. board)            01/01/70 00:00      
         bible time            01/01/70 00:00      
            why not?            01/01/70 00:00      
            Not entirely correct            01/01/70 00:00      
               yes, but            01/01/70 00:00      
                  Limitations of SiLabs            01/01/70 00:00      
                     A very welcome "limitation", it allow th            01/01/70 00:00      
                        SRAM is fast            01/01/70 00:00      
                           WGASA            01/01/70 00:00      
                     Maybe that's not all needed ...            01/01/70 00:00      
                        flying blind?            01/01/70 00:00      
                           monitor vs. quasiICE            01/01/70 00:00      
                              monitor debugging            01/01/70 00:00      
                                 on monitors etc.            01/01/70 00:00      
                                    intrusive tools are worse than none            01/01/70 00:00      
                                       Depends            01/01/70 00:00      
                                          I do not know, but if code is volatile,            01/01/70 00:00      
                                             That's what I've heard            01/01/70 00:00      
                                       No such thing as non-intrusive            01/01/70 00:00      
                                          thanks            01/01/70 00:00      
                                             single stepping, breakpoints and ICE            01/01/70 00:00      
                                                Correct, but not that far from it            01/01/70 00:00      
                                                   ICE is different from "real life"            01/01/70 00:00      
                                                      breakpoints            01/01/70 00:00      
                                                      That is exactly why they have JTAG debug            01/01/70 00:00      
                                                   Personally, my approach...            01/01/70 00:00      
                                                      the problem with dumps            01/01/70 00:00      
                                                         Perhaps            01/01/70 00:00      
                                                            that is usually my case            01/01/70 00:00      
   SuperSet of SiLabs F12x board available            01/01/70 00:00      
      praveen            01/01/70 00:00      
         SuperSet of SiLabs F12x board available            01/01/70 00:00      
            how do you do that?            01/01/70 00:00      

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