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???
07/26/05 20:45
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 		 #98213 - DS89C420 vs. DS89C430/440/450
Responding to: ???'s previous message
Craig Steiner said:
Jan Waclawek said:
I think the DS89C450 is an upgrade to DS89C420, so isn't it worth ordering these?


Not sure, could be. I originally ordered the DS89C420 because that's what Phillip Gallo was using for his 8051 video experiment. I didn't even bother to look to see if there were better options since the '420 was good enough for what I wanted to eventually play with (and which I still haven't had time to play with).

Regards,
Craig Steiner

The DS89C420 was the first device in Maxim/Dallas' Ultra-High-Speed Microcontroller line. It features 16 KB of flash for code, and ISP, via the bootloader which is in permanent ROM on the device.

The DS89C430, DS89C440, and DS89C450 were introduced later. These devices are very similar to the DS89C420, except that in addition to in system programming via the ROM bootloader, they also support in-application programming (IAP). Thus, it is possible for your own firmware running on the device to modify the code in flash (i.e., while running your own code). I haven't tried this yet. Among these three later devices, the only (nominal) differences between them are the amoung of flash they contain. The '430 has 16 KB, the '440 32 KB, and the '450 64 KB.

--Sasha Jevtic

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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