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???
07/14/06 12:27
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 		 #120255 - I, too, can visualize some exotic conditions where
Responding to: ???'s previous message
in case this does get out of sequence, the numbers (which do not copy over) refer to http://www.8052.com/forum/read.phtml?id=120246

As said above, some of the internal WD's are a crap.

Jan, what you state is somewhat valid, but what you seem to miss is that 99.9% of the incidents that a WD should catch in fact ARE caught by traditional internal watchdogs.

I, too, can visualize some exotic conditions where a traditional WD may not catch it, but, outside pacemakers and such, the traditional WD serves very well.

1) is not worth it for the cost vs numbers of catches (I imagine zero).
2) I know of no decent internal dog that does not
5) Nice, but why? if you get a WD reset you ARE in doo-doo. Btw most decent dogs do have this.
6) would defeat the purpose of consequtive writes, if the writes do not have to be consequtive, the chance of runaway code keeping the puppy alive is greatly increased.

Erik

List of 30 messages in thread
TopicAuthorDate
processor fault            01/01/70 00:00      
   Use Watchdog            01/01/70 00:00      
      Not necessarily            01/01/70 00:00      
         Spec of AT89S51            01/01/70 00:00      
            Still too specific            01/01/70 00:00      
   There is no one such thing!            01/01/70 00:00      
   Undefined state !            01/01/70 00:00      
      processor fault            01/01/70 00:00      
         RTFM            01/01/70 00:00      
            reset            01/01/70 00:00      
               Read the data sheet            01/01/70 00:00      
                  WD with indication            01/01/70 00:00      
                     I, too, can visualize some exotic conditions where            01/01/70 00:00      
                        to bite or not to bite            01/01/70 00:00      
                           the REAL issue            01/01/70 00:00      
                              Marketing trick            01/01/70 00:00      
                                 to be dramatic            01/01/70 00:00      
                                    It is helpful, of course.            01/01/70 00:00      
                                 let's put it this way:            01/01/70 00:00      
                           I doubt that it's 10 transistors ...            01/01/70 00:00      
                              the context            01/01/70 00:00      
                     Can you name an example of this sort?            01/01/70 00:00      
                  reset            01/01/70 00:00      
                     AT89S51 WD            01/01/70 00:00      
         How do you propose to make the processor "illumina            01/01/70 00:00      
   Software hang-up, hardware lock-up            01/01/70 00:00      
      How about redundancy?            01/01/70 00:00      
         paranoia            01/01/70 00:00      
            ... but it WILL detect a processor fault!            01/01/70 00:00      
               The ultimate misconception            01/01/70 00:00      

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