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???
07/26/05 19:00
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#98198 - Which is exactly what they say ...
Responding to: ???'s previous message
Jan,

You are "dead on" as the quote from the web site repeats:

"Worlds Fastest Drop-In 8051 with In-Application Programmable Flash"

I like the DS'4x0 series a lot and have used quite a few of them in products.

Atmel has recently joined the single machine cycle fray with thier "LP" products (a 20MHz '2051 with mostly single cycle execution rate is a killer part).

Noticably, some of the design features of the DS'4x0 demonstrate a better ability as a "drop-in" upgrade as the clocks/timers retaining 12x divider unless you program them to be faster. This means SIO works "out of the box" and if you've kept time critical routines tied to these timers they perform the same (unless a faster code path has implication).

The ISP for the Atmel "LP" parts is not as forgiving as using the DS'4x0 3 wire serial connection (with bootloader) but is a fine alternative to poping out the part and re-flashing it.

The serial programming capability of the DS'420 makes things easy but the MTK program does have it's limits. If you use standard '51 crystal frequencies you don't have to "diddle" the PC uart timing (in the MTK app).

The MSC121x while not being as fast as the DS'4x0's (4x machine cycle) has a very good and frequency tolerant SIO programming capability and is a well concieved, feature rich analog platform. It is not a pin compatible processor, however.

regards,
p


List of 38 messages in thread
TopicAuthorDate
Looking for 80C251 board            01/01/70 00:00      
   DS89C450 is fast 8051.            01/01/70 00:00      
      Cheap 'n' cheerful            01/01/70 00:00      
      builtin bootloader            01/01/70 00:00      
         Common place            01/01/70 00:00      
            good to know            01/01/70 00:00      
               And Texas Instruments            01/01/70 00:00      
                  DS89C4x0            01/01/70 00:00      
                     Not sure            01/01/70 00:00      
                        DS89C420 vs. DS89C430/440/450            01/01/70 00:00      
                     You are probably right            01/01/70 00:00      
                  ok            01/01/70 00:00      
            Death of the Programmer            01/01/70 00:00      
         Yes, it's nice            01/01/70 00:00      
            comments            01/01/70 00:00      
      "marketing"            01/01/70 00:00      
         let's put it this way:            01/01/70 00:00      
            Which is exactly what they say ...            01/01/70 00:00      
               overview            01/01/70 00:00      
                  DS'420 IAP            01/01/70 00:00      
                     I'm not polite...            01/01/70 00:00      
                        MAXIM/Dallas and Flash            01/01/70 00:00      
                           common practice today            01/01/70 00:00      
                           Nor forgetting            01/01/70 00:00      
                              DS2250 - Secure Micro            01/01/70 00:00      
      Very nice and informative            01/01/70 00:00      
   Saved a few cents for a lot of work.            01/01/70 00:00      
      In-system programming            01/01/70 00:00      
         ISP Header            01/01/70 00:00      
      schematics?            01/01/70 00:00      
         if you are looking for schematics of ISP            01/01/70 00:00      
   Why on earth            01/01/70 00:00      
   '251 board            01/01/70 00:00      
   if you decide to leave the '51 (which yo            01/01/70 00:00      
   8052.com SBC supports DS89C420            01/01/70 00:00      
   Dead Thread?            01/01/70 00:00      
NOTICE: Message(s) moved            01/01/70 00:00      
   Moving posts            01/01/70 00:00      

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