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01/11/08 20:10
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 		 #149324 - DAA on other Architectures
Responding to: ???'s previous message
After going through this thread I was interested on how some other microcontrollers implement the DAA instruction. I am currently not using an 8051 based devices where I work so I took a look at the documentation for an 8-bit Freescale part we are currently using. It seems it works in the same way as the SiLabs part that was tested here but has a more complete description of how it handles it's DAA command. At the following link on pages 107, 246 and 247 (this one really describes the operation) you can find the relevant information. Too bad the bible wasn't this indepth about the DA implementation for 8051's.

*HCS08 C-Bit = C for 8051's and
*HCS08 H-Bit = AC for 8051's.

Freescale HCS08 Instruction Set

List of 34 messages in thread
TopicAuthorDate
DAA Misunderstanding            01/01/70 00:00      
   could this be it?            01/01/70 00:00      
      Maybe ... nope            01/01/70 00:00      
   a double negative ???            01/01/70 00:00      
      ... or an exclusive OR            01/01/70 00:00      
      Case 4            01/01/70 00:00      
         Are there don't-care situations?            01/01/70 00:00      
            I think this is the case            01/01/70 00:00      
               Not quite ...            01/01/70 00:00      
                  no            01/01/70 00:00      
            True to bible            01/01/70 00:00      
   e-mail to SILabs sent just now            01/01/70 00:00      
   Operands must consist of two packed BCD digits!            01/01/70 00:00      
      OK, but what does a packed 07 look like            01/01/70 00:00      
         Correct            01/01/70 00:00      
            if case 4 is a biblical catastrophe            01/01/70 00:00      
               Not true            01/01/70 00:00      
                  more to this            01/01/70 00:00      
                     Same as Case 1            01/01/70 00:00      
   reply from SILabs            01/01/70 00:00      
      I'm happy now            01/01/70 00:00      
      I am willing to try...            01/01/70 00:00      
         DA A test program            01/01/70 00:00      
            the results...            01/01/70 00:00      
               DS89C450 is strictly "biblical", too...            01/01/70 00:00      
                  The DAA instruction is so specific...            01/01/70 00:00      
                     point of view            01/01/70 00:00      
                        Agreed!            01/01/70 00:00      
               the last hope gone... XC866 is DAA-biblical too            01/01/70 00:00      
                  no "pick and choose" eitherThe Bible or "the bible            01/01/70 00:00      
                     don't take it too literally, please...            01/01/70 00:00      
      DAA on other Architectures            01/01/70 00:00      
         this is how it happened            01/01/70 00:00      
         Thanks for the link!            01/01/70 00:00      

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