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???
12/22/06 11:49
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 		 #129990 - I confirm that
Responding to: ???'s previous message
Peter Dannegger said:
But sometimes I stopped, because AVR code need more Flash.

Yes I confirm that. My finding is, that generally one needs 1.5-2x more flash on AVR than on '51.

I admit that none of my "conversions" nor any of the projects I did natively on AVRs dealt with complex interrupts, so I cannot comment on it. I did use an another processor with no implicit support for nested/prioritized interrupts, and I had no problem to solve it in software - but I admit this means significantly more overhead than if it is dealt with in hardware.

The lack of bit instructions (there are some but quite crappy) is rather irritating. Generally, if one is accustomed to write in asm on "conventional" processors, when moving to the modern "optimized" cores one feels often very constrained - more people confirmed me this (I don't like the "RISC/CISC" labels as they are abused too often). Based on what I saw on your excellent website, Peter, I think, you too like to write in C on AVRs more than asm, while I believe this ratio is 1:1 for '51s.

JW



List of 49 messages in thread
TopicAuthorDate
second serial port            01/01/70 00:00      
   google search            01/01/70 00:00      
   Didn't Search First            01/01/70 00:00      
      Yes , you can build your own software port.            01/01/70 00:00      
         No 3 on Jan's List            01/01/70 00:00      
            No 3 on Jan's List            01/01/70 00:00      
   have a look at here also            01/01/70 00:00      
      No 5 on Jan's Previous List            01/01/70 00:00      
   Have you considered 8052?            01/01/70 00:00      
      No 1 on Jan's List!            01/01/70 00:00      
      no problem in using 805x            01/01/70 00:00      
         do so, but first ...            01/01/70 00:00      
            I\'d say...            01/01/70 00:00      
               use something            01/01/70 00:00      
                  makes little sense ...            01/01/70 00:00      
                  No 6 on Jan's List - Why PIC?            01/01/70 00:00      
                     makes little sense ...            01/01/70 00:00      
                        1) why different architecture            01/01/70 00:00      
                        Sense            01/01/70 00:00      
                           Context            01/01/70 00:00      
                              Question for Ap Charles            01/01/70 00:00      
                                 Answer to Andy Neil            01/01/70 00:00      
                                    Fair point - so back to OP            01/01/70 00:00      
         Maybe one uArt is enough...            01/01/70 00:00      
   use Atmels            01/01/70 00:00      
      why use Atmel?            01/01/70 00:00      
         Maybe other architecture            01/01/70 00:00      
            why on earth do that            01/01/70 00:00      
               Don't let the pot call the kettle black ...            01/01/70 00:00      
                  I do not "call the kettle black" except..            01/01/70 00:00      
                     Noted            01/01/70 00:00      
                        I appreciate that Andy            01/01/70 00:00      
                           Erik's error rate            01/01/70 00:00      
                              you must be getting into the Christmas spirit            01/01/70 00:00      
               it's quite easy            01/01/70 00:00      
                  yechhh ... ATMEL (eewwww...)            01/01/70 00:00      
                  8051 -> AVR: not easy !!!            01/01/70 00:00      
                     good discussion            01/01/70 00:00      
                        How can you do this            01/01/70 00:00      
                           hand shaking            01/01/70 00:00      
                              no need of handshaking signals            01/01/70 00:00      
                                 you are right            01/01/70 00:00      
                              Not necessarily            01/01/70 00:00      
                     I confirm that            01/01/70 00:00      
         it all depends on what he can both get and afford            01/01/70 00:00      
            The architecture doesn't really matter            01/01/70 00:00      
               architectures            01/01/70 00:00      
                  There are many ways of defining "best"            01/01/70 00:00      
   how true            01/01/70 00:00      

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