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???
07/08/08 03:54
Modified:
  07/08/08 04:17
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 		 #156505 - DPTR .... Yes!!
Responding to: ???'s previous message
Alan:

I think you may want to review the data sheet for your AT89C4051 closely. This part does in fact have a DPTR. Look at this block diagram as shown in the data sheet. The DPTR is there!! The SFR map also shows the individual DPH and DPL registers too.



What is not present is a valid usage model for the MOVX instruction since there is no on-board XRAM or external memory interface.

Michael Karas


List of 32 messages in thread
TopicAuthorDate
loading the SBUF shortcut?            01/01/70 00:00      
   Printing a string            01/01/70 00:00      
   Shortcut...NOT            01/01/70 00:00      
   You have to enrich your library of Assembly Code            01/01/70 00:00      
      that is not a shortcut            01/01/70 00:00      
         Library of Assembly Code            01/01/70 00:00      
            the key word            01/01/70 00:00      
               polled serial            01/01/70 00:00      
                  "living with interrupts "            01/01/70 00:00      
                     what I got out of all of this            01/01/70 00:00      
                        DPTR .... Yes!!            01/01/70 00:00      
                        Check out DPTR            01/01/70 00:00      
                     I AGREE            01/01/70 00:00      
                        agree with WHAT?            01/01/70 00:00      
                            I AGREE with ...            01/01/70 00:00      
   C shortcut            01/01/70 00:00      
      'C' confusion            01/01/70 00:00      
         Confused            01/01/70 00:00      
            Maybe, maybe not            01/01/70 00:00      
               printf baggage            01/01/70 00:00      
                  This should come as no surprise            01/01/70 00:00      
               27K lots of memory            01/01/70 00:00      
                  "C baggage"            01/01/70 00:00      
                     Getting off-topic            01/01/70 00:00      
                        I wholehardely agree            01/01/70 00:00      
         Shortcuts are for wimps!            01/01/70 00:00      
            Disagree            01/01/70 00:00      
            Half a million Lines?            01/01/70 00:00      
               I didn't use 'C' or other HLL's on the old PC            01/01/70 00:00      
   Poor choice of terms!            01/01/70 00:00      
      A subroutine?            01/01/70 00:00      
         more code-efficient that macros            01/01/70 00:00      

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