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???
03/02/05 08:36
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 		 #88848 - Oh no it doesn't
Responding to: ???'s previous message
Michael Karas said:
I would like to see the silly 0xA5 opcode eliminated from the processor. This instruction code supposedly operates similar to a NOP except that it sets the CY flag.

That must be a variant-specific feature, surely?

Intel left it undefined to allow an "escape" mechanism for adding extra instructions; eg, this is how they did the 80251.

Triscend use it as a software breakpoint:
http://www.8052.com/forum/read.phtml?id=14781

I'm sure other manufacturers have their own ideas...



List of 43 messages in thread
TopicAuthorDate
Kitchen Drain .. Unwanted Features            01/01/70 00:00      
   13-bit Mode for Timers            01/01/70 00:00      
   Dumb A5 Opcode            01/01/70 00:00      
      0xA5 opcode            01/01/70 00:00      
         Finally room for XOR C,bit :)            01/01/70 00:00      
            MOV bit,bit            01/01/70 00:00      
      CY flag            01/01/70 00:00      
         My A5 source information....            01/01/70 00:00      
            More A5 opcode info            01/01/70 00:00      
            0xA5 is derivative-depend            01/01/70 00:00      
      Oh no it doesn't            01/01/70 00:00      
   Inverted wishlist            01/01/70 00:00      
      Inverted wishlist            01/01/70 00:00      
         wishlist II.            01/01/70 00:00      
            Loadsa XRAM!            01/01/70 00:00      
               Don't believe all you see...            01/01/70 00:00      
                  because of the taste of vanilla            01/01/70 00:00      
                     chocolate chips            01/01/70 00:00      
                  Unbelievable!            01/01/70 00:00      
            Ridiculous MOVC addressing modes...            01/01/70 00:00      
               MOVC            01/01/70 00:00      
               MOVC Designer.....Your Fired !!            01/01/70 00:00      
      Errr then it's not an 8051 then!            01/01/70 00:00      
         Is it then 8051            01/01/70 00:00      
         AVR???            01/01/70 00:00      
      wishlist continued            01/01/70 00:00      
         low power at slow clock            01/01/70 00:00      
            low power            01/01/70 00:00      
               i am confused!            01/01/70 00:00      
                  But I thought they ARE CMOS!            01/01/70 00:00      
                     quiescent            01/01/70 00:00      
   what I definitely do not want            01/01/70 00:00      
      Right architecture            01/01/70 00:00      
         some of us do bits a bit fast            01/01/70 00:00      
            I know but...            01/01/70 00:00      
               all things to all people            01/01/70 00:00      
                  erics last post            01/01/70 00:00      
         RIght Achitecture???            01/01/70 00:00      
      So what do you think about...            01/01/70 00:00      
         ADC/DAC will live forever!            01/01/70 00:00      
            That guy?            01/01/70 00:00      
               Stick            01/01/70 00:00      
   Ability of changing return from interupt            01/01/70 00:00      

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