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???
11/11/08 16:47
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 		 #159953 - ORL, Set any bit (more informative)
Responding to: ???'s previous message
Corectness:

iram in the lower address range 0x00-0x7F is RAM and can be accessed by direct or indirect method.

addresses in upper range of 0x80-0xFF define the SFRs when are direct addressed.

RAM locations at address range 0x80-0xFF can only be indirectly addressed.

ORL iram addr,#data
so by ORL you can SET any bit in RAM at 0x00-0x7F and SFRs at 0x80-0xFF.

The ORL instruction cannot access by indirect method the upper RAM at 0x80-0xFF.

"The '51 bible" from NXP displays all that more educational.

K.L.Angelis



List of 34 messages in thread
TopicAuthorDate
a simple SETB question            01/01/70 00:00      
   SETB from 20h to 2FH            01/01/70 00:00      
      assembler missed this one            01/01/70 00:00      
         I know of none that can't            01/01/70 00:00      
   what about this?            01/01/70 00:00      
      try ORL to set any bit in internal RAM            01/01/70 00:00      
         wrong, nonstandard and why            01/01/70 00:00      
            ORL, Set any bit (more informative)            01/01/70 00:00      
               iram            01/01/70 00:00      
                  Where is that defined?            01/01/70 00:00      
                     my word was not 'defined' but            01/01/70 00:00      
                        a rose, by any other name ...            01/01/70 00:00      
                           I think Erik has it?            01/01/70 00:00      
                              aliased/overlayed            01/01/70 00:00      
                                 Fair enough            01/01/70 00:00      
                              pDATA?            01/01/70 00:00      
                                 Why do you think 64TB would be enough?            01/01/70 00:00      
                                    It would not be            01/01/70 00:00      
                                       Tools are important for size            01/01/70 00:00      
                                          That's why there's ASM to use instead            01/01/70 00:00      
                                       this flies against some previous posts of yours            01/01/70 00:00      
                                          It's like herding cats            01/01/70 00:00      
                                             Flame bait?            01/01/70 00:00      
                                                No ... not really            01/01/70 00:00      
                                                   yes            01/01/70 00:00      
                                 PDATA & XDATA            01/01/70 00:00      
                                    I won't argue that ... but ...            01/01/70 00:00      
                                       Agreed, but...            01/01/70 00:00      
                                          It is seldom that simple ...            01/01/70 00:00      
                                             That's the point!            01/01/70 00:00      
                                             since you are really interested            01/01/70 00:00      
                                                Thanks!            01/01/70 00:00      
      Yes, that is the way I normally do it            01/01/70 00:00      
      WHY TO DISTURB ACC ?            01/01/70 00:00      

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