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04/03/09 00:03
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 		 #164262 - That's why I like the Maxim/Dallas parts
Responding to: ???'s previous message
The one thing I've noticed in the Maxim/Dallas DS89C4x0's is that they have "classic" instruction timing, though they run much faster, being one cycle rather than 12-cycle cores, and unless you choose to fiddle with 'em, which you can, under SFR/firmware control, they leave the cycles alone. There's no pipeline, so interrupt response is quick.

I've recently taken to using the DS89C4x0's as DMAC's, operating the mode of the MOTOROLA MC6844, i.e. as an address generator and counter, by using a straight-lined block of MOVX instructions, all the while ignoring the data, as the MC6844 does. The result is that I can effect 8-, 16-, 32-, or other bit width data transfers under firmware control, yet leave the process completely interruptible. With the second data pointer, I can then interrupt a transfer with another transfer without losing my place. I like that!

RE


List of 71 messages in thread
TopicAuthorDate
2009 Embedded Systems Conference Trip Report            01/01/70 00:00      
   8051 dead?            01/01/70 00:00      
      I have heard that before            01/01/70 00:00      
         quoting Samuel Clemens            01/01/70 00:00      
   Not dead, but not sexy?            01/01/70 00:00      
   Ramtron?            01/01/70 00:00      
      Why is their part so much faster ...            01/01/70 00:00      
         it runs out of FLASH, not FRAM            01/01/70 00:00      
            Which rather kills their own claims for FRAM?            01/01/70 00:00      
            width of program memory            01/01/70 00:00      
               4 times as fast            01/01/70 00:00      
                  It might have to be wider            01/01/70 00:00      
                     Memory acceleration a growing problem            01/01/70 00:00      
                     Branch prediction?            01/01/70 00:00      
                        all these techniques...            01/01/70 00:00      
                           That's why I like the Maxim/Dallas parts            01/01/70 00:00      
                           In that case, BP was optional.            01/01/70 00:00      
                              yes, it's the good news, that it's possible at all            01/01/70 00:00      
   Dead? Keil (an ARM company) don't think so!            01/01/70 00:00      
      That's still their goal ...            01/01/70 00:00      
         native-mode environment            01/01/70 00:00      
            cross-compilation is king            01/01/70 00:00      
            I don't follow ...            01/01/70 00:00      
               Follow            01/01/70 00:00      
                  I still don't know what you meant, Andy ...            01/01/70 00:00      
                     Cheap native compiler normally equals cheap cross-compiler            01/01/70 00:00      
                        I'm told GCC is about the best there is ...            01/01/70 00:00      
                           It makes little sense            01/01/70 00:00      
                           I'm told that it may not be...            01/01/70 00:00      
                     Now I'm confused!            01/01/70 00:00      
                        I guess it's just a matter of preference.            01/01/70 00:00      
                           Still unsure what your "it" was            01/01/70 00:00      
                              the IT is in the full implementation.            01/01/70 00:00      
                                 $40 evb's for a fully-implemented ARM            01/01/70 00:00      
                                    Normally compiling on a PC            01/01/70 00:00      
                                    Will $49 do?            01/01/70 00:00      
                                       €39            01/01/70 00:00      
                                          STR9-comSTICK            01/01/70 00:00      
                                             Well, the goal is to leave the PC out of the picture            01/01/70 00:00      
                                                rephrase            01/01/70 00:00      
                                                   I must admit, that is quite true ...            01/01/70 00:00      
                                       Well, not quite ...            01/01/70 00:00      
                                          Full complement            01/01/70 00:00      
                                             Careful, now!            01/01/70 00:00      
                                    What I meant ...            01/01/70 00:00      
         ... which is in turn good news for the chipmakers...            01/01/70 00:00      
            I just bought a new hot-water-heater that's 'net free            01/01/70 00:00      
               yes, we know you love that old stuff ;-)            01/01/70 00:00      
                  old-stuff?            01/01/70 00:00      
                  W2            01/01/70 00:00      
         Windows for ARM...?            01/01/70 00:00      
            EEEEEEK!            01/01/70 00:00      
               I knew you'd like it!            01/01/70 00:00      
            There's already a Windows for ARM.            01/01/70 00:00      
   ARM for cheap            01/01/70 00:00      
      Cheap ARM vs Expensive 8052            01/01/70 00:00      
         The cheapest ARM chips can be had for $1            01/01/70 00:00      
            For hobbyists            01/01/70 00:00      
         It's getting to be that way, but ...            01/01/70 00:00      
      Yes, that one is pretty close            01/01/70 00:00      
         Don't lock down memory size - just think "good enough"            01/01/70 00:00      
            No, it should NOT be just that ...            01/01/70 00:00      
               All depending on product and actual product usage            01/01/70 00:00      
   TI buys Luminary            01/01/70 00:00      
      Detail (updated)            01/01/70 00:00      
      What's it like to be taken-over by TI?            01/01/70 00:00      
         Burr-Brown            01/01/70 00:00      
            Another update for your "family tree"...            01/01/70 00:00      
               TI had benchmarq too            01/01/70 00:00      
               who ate whom            01/01/70 00:00      
                  Benchmarq -> Unitrode -> TI            01/01/70 00:00      

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