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???
11/15/07 13:43
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 		 #147013 - Misunderstanding
Responding to: ???'s previous message
Andy Neil said:
How will that allow you to define more variables?!

If your XDATA space is full, then it's full - defining absolute addresses will not magically create extra memory locations!



I meant to say that my internal RAM is filled up . my 32k external RAM is not running out of memory. so i am planning to use the _at_ keyword to define variables in the expanded ram.

if i use xdata with external ram switched off( through AUXR ) than would i be using the Expanded RAM ( 768 bytes in my case) ?

Andy Neil said:
Have you not configured the tools to use the external XDATA RAM?

Have you enabled the Data Overlaying


I dont have a clue about configuring the KEIL Uvision 2, are you talking setting the memory model.

i am googling about data overlaying.







List of 119 messages in thread
TopicAuthorDate
USING EXTERNAL RAM AS CODE MEMORY            01/01/70 00:00      
   no need            01/01/70 00:00      
      MMC ...            01/01/70 00:00      
         Let him do what he wants!            01/01/70 00:00      
            did I say not to?            01/01/70 00:00      
            how to?            01/01/70 00:00      
               But how?            01/01/70 00:00      
                  well,            01/01/70 00:00      
                     end of wrong stick!            01/01/70 00:00      
                        already stated            01/01/70 00:00      
                           I see            01/01/70 00:00      
   How will you load the RAM?            01/01/70 00:00      
   I agree with some here            01/01/70 00:00      
      What's pretty handy is BBRAM            01/01/70 00:00      
         True, but            01/01/70 00:00      
      double-post ... sorry!            01/01/70 00:00      
      A little tidy-up            01/01/70 00:00      
         there is a way ... in fact, several ...            01/01/70 00:00      
            and appears to have lost interest            01/01/70 00:00      
               APOLOGIES AND CLARIFICATION            01/01/70 00:00      
                  answer            01/01/70 00:00      
                     Why 32K?            01/01/70 00:00      
                        Erik's Answer            01/01/70 00:00      
                     FURTHER HELP NEEDED.            01/01/70 00:00      
                        Yes, of course!            01/01/70 00:00      
                           the Basics implementation            01/01/70 00:00      
                              TC?            01/01/70 00:00      
                              Please explain            01/01/70 00:00      
                                 Binary executable format?            01/01/70 00:00      
                                    Still not got it!            01/01/70 00:00      
                                       order of intel hex file            01/01/70 00:00      
                                          records in Intel Hex file not necessarily in order            01/01/70 00:00      
                                             YES THE RECORDS ARE NOT IN SEQUENCE            01/01/70 00:00      
                                                Not strange at all            01/01/70 00:00      
                                 Good question...            01/01/70 00:00      
                                    Binary executable            01/01/70 00:00      
                                       I don't think you were            01/01/70 00:00      
                                          Elaboration requested.            01/01/70 00:00      
                                             GOT it, no elaboration required            01/01/70 00:00      
                                             That's it            01/01/70 00:00      
                        I'm sorry, but            01/01/70 00:00      
                        .            01/01/70 00:00      
                           here is a link to a free 8051 assembler.            01/01/70 00:00      
                           Pardon?            01/01/70 00:00      
                              I didnt mean it that way.            01/01/70 00:00      
                                 Still lost            01/01/70 00:00      
                                    I HAVE TO DEAL WITH HEX CODE            01/01/70 00:00      
                                       Additionaly            01/01/70 00:00      
                                          Duplicate post!            01/01/70 00:00      
                  Some comments            01/01/70 00:00      
         I'm using simple terms            01/01/70 00:00      
            @ Mike Stegaier            01/01/70 00:00      
            Not true            01/01/70 00:00      
               FLASH ROM and EEPROM            01/01/70 00:00      
                  Literal or idiomatic            01/01/70 00:00      
                     here's why            01/01/70 00:00      
                        .            01/01/70 00:00      
                           oh yes, it is            01/01/70 00:00      
                              ...            01/01/70 00:00      
   double post, please ignore            01/01/70 00:00      
   KISS            01/01/70 00:00      
   Similar project            01/01/70 00:00      
   Additionaly            01/01/70 00:00      
      You really need to study some basics first!            01/01/70 00:00      
         Apology            01/01/70 00:00      
      Make it simple...            01/01/70 00:00      
   Dynamic linking            01/01/70 00:00      
      Not on an 8051!            01/01/70 00:00      
         But i have to find a way            01/01/70 00:00      
            Bootloader            01/01/70 00:00      
            tri-processor?            01/01/70 00:00      
            You are where you are            01/01/70 00:00      
               Brand new product            01/01/70 00:00      
         There may be a way out after all ...            01/01/70 00:00      
            I don't think so?            01/01/70 00:00      
   Processor Not my choice            01/01/70 00:00      
   How to use external EEPROM AT24C16A with P89C51RD2            01/01/70 00:00      
   ANDY is right jerson but Thanks :)            01/01/70 00:00      
      Thinking laterally            01/01/70 00:00      
         good idea!            01/01/70 00:00      
            Some sort of P-Code Interpreter            01/01/70 00:00      
   Comments            01/01/70 00:00      
      Really Bad idea!            01/01/70 00:00      
         Misunderstanding            01/01/70 00:00      
            why, oh why?            01/01/70 00:00      
            No - that is still a really bad idea!            01/01/70 00:00      
               Is it Still a bad idea????????            01/01/70 00:00      
                  Use the Linker            01/01/70 00:00      
                     Got it Andy.            01/01/70 00:00      
      Summary needed            01/01/70 00:00      
         Required Summary            01/01/70 00:00      
            somethingt does not jive            01/01/70 00:00      
            something else does not jive            01/01/70 00:00      
               Yes i have 3 processors            01/01/70 00:00      
            Why only 32K            01/01/70 00:00      
               32k is fine but do suggest some IC's            01/01/70 00:00      
                  -2 for help?            01/01/70 00:00      
                     Still don't get it!            01/01/70 00:00      
                  don't be silly            01/01/70 00:00      
                     Thanks ERIC!!!!            01/01/70 00:00      
      comments            01/01/70 00:00      
         What a revelation, I bet most did not know that            01/01/70 00:00      
         ???            01/01/70 00:00      
            THANKS ANDY, you are a real CHUM            01/01/70 00:00      
            my explanation            01/01/70 00:00      
               who on earth, in his right mind ...            01/01/70 00:00      
               You need to think more carefully before you write            01/01/70 00:00      
         Data compression, point taken            01/01/70 00:00      
   CHECKSUM COMPLETED            01/01/70 00:00      
      Time for a new thread?            01/01/70 00:00      
   CONTROLLER SPEEDS/ MISMATCH CRYSTAL??????            01/01/70 00:00      
      Don't ignore the datasheet!            01/01/70 00:00      
         Through a pin/bit complementing program            01/01/70 00:00      
            who gives a hoot            01/01/70 00:00      
            Obviously will be less than the crystal frequency!            01/01/70 00:00      
               Only Complement instruction            01/01/70 00:00      
                  Complement Only?            01/01/70 00:00      
                     Can't be just a single instruction!            01/01/70 00:00      
                        GOT THE POINT.            01/01/70 00:00      

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