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Erik Malund
07/26/05 14:42
Read: 2355 times
Mt Airy, Nc
USA


 
#98212 - comments
Responding to: Sasha Jevtic's previous message
Yes, you're right about the builtin bootloader. You must also force a few pins on the device to enter bootloader execution mode; this is what the 74xx125 tri-state buffers shown in Dallas' documentation are for.
I do not know the device, but would it not be possible to make a NoTouch for it?

If that is really the case than this should be the device of choice for students and hobbyists IMHO.
for that I would much more suggest the SILabs offerings (except f3xx) since these have a built-in (free) ICE capability, and I can see no better way to learn/study than to see what goes on inside the chip for each and every step.

If you can run it at moderate frequencies, it's quite manageable, and can still outperform a lot of more conventional 8051-based devices. But, as you head for the upper range of clock speeds, you start running into issues.
This problem is - to some extent - true for any clock speed. A device capable of high speed must - by definition - have steep rise and fall. Steep rise and fall can create havoc on octupus wiring regardless of clock speed.

Erik


List of 38 messages in thread
TopicAuthorDate
Looking for 80C251 board      Henry Sodens      07/25/05 21:20      
   DS89C450 is fast 8051.      Charles Bannister      07/25/05 22:34      
      Cheap 'n' cheerful      Russell Bull      07/26/05 01:56      
      builtin bootloader      Matthias Arndt      07/26/05 03:05      
         Common place        Steve M. Taylor      07/26/05 05:06      
            good to know      Matthias Arndt      07/26/05 06:45      
               And Texas Instruments        Craig Steiner      07/26/05 06:58      
                  DS89C4x0      Jan Waclawek      07/26/05 07:19      
                     Not sure      Craig Steiner      07/26/05 07:35      
                        DS89C420 vs. DS89C430/440/450      Sasha Jevtic      07/26/05 14:45      
                     You are probably right      Matthias Arndt      07/26/05 09:53      
                  ok      Matthias Arndt      07/26/05 09:55      
            Death of the Programmer        Andy Neil      08/01/05 02:21      
         Yes, it's nice      Sasha Jevtic      07/26/05 14:33      
            comments      Erik Malund      07/26/05 14:42      
      "marketing"      Erik Malund      07/26/05 07:26      
         let's put it this way:      Jan Waclawek      07/26/05 07:46      
            Which is exactly what they say ...      Phillip M Gallo      07/26/05 13:00      
               overview      Jan Waclawek      07/26/05 14:55      
                  DS'420 IAP      Phillip M Gallo      07/26/05 15:03      
                     I'm not polite...      Jan Waclawek      07/26/05 15:31      
                        MAXIM/Dallas and Flash      Phillip M Gallo      07/26/05 16:16      
                           common practice today      Erik Malund      07/26/05 16:23      
                           Nor forgetting      Steve M. Taylor      07/27/05 07:42      
                              DS2250 - Secure Micro      Phillip M Gallo      07/27/05 11:57      
      Very nice and informative      Kai Klaas      07/30/05 05:19      
   Saved a few cents for a lot of work.      Charles Bannister      07/26/05 02:42      
      In-system programming      Sasha Jevtic      07/26/05 14:59      
         ISP Header        Phillip M Gallo      07/30/05 11:31      
      schematics?      Christian Kleiber      07/28/05 00:08      
         if you are looking for schematics of ISP      Erik Malund      07/28/05 05:59      
   Why on earth      Erik Malund      07/26/05 06:30      
   '251 board      Phillip M Gallo      07/26/05 13:10      
   if you decide to leave the '51 (which yo      Erik Malund      07/26/05 13:19      
   8052.com SBC supports DS89C420      Jon Ledbetter      07/27/05 15:23      
   Dead Thread?      Andy Neil      08/01/05 05:03      
NOTICE: Message(s) moved      Craig Steiner      07/30/05 08:40      
   Moving posts      Terry Lingle      07/30/05 10:27      

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