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???
10/24/07 18:02
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 		 #146150 - oh yes, it is
Responding to: ???'s previous message
so it is NOT wrong to use 32KB ROM and up.
oh yes, it is as you stated it. You made the statement in:
http://www.8052.com/forum/read.phtml?id=146098 together with
Tie A15 to CE' (an active low chip enable) on your ROM, and tie A15 to CE' on your RAM through an inverter, so that one chip (RAM or ROM) can be active at a time.

I specifically said "the "A15 trick" requires that you use no more than 32k of ROM". If you add more than 32k of ROM under the premises you stated it will NOT% work.

Erik




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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