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???
02/22/07 08:41
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 		 #133488 - already answered
Responding to: ???'s previous message
Hendryawan said:

With pushing SW1 manytime, uC finally hung (SFR corrupt), I reset and try again and again the result always hung.
So I change with new uC with same type same program and tested again, the result never hung.
Now,I understand that every chips not same with electrical noise resistant.
What can you do if SFR corrupt Klai?
thank & regard

hendry


The answer is here:
http://www.8052.com/forum/read.phtml?id=133431

Make sure your relay does not have an impact on the circuit.
Do not try to cure a corrupted SFR... just prevent it from happening. ANd yes you can use a watchdog, but that will not be enough.
If you hit your head with a hammer, you get a headache. You can try to put on helmet, but wouldn't it be better not to hit your head with a hammer in the first place?

regards
Patrick


List of 51 messages in thread
TopicAuthorDate
How its happen?            01/01/70 00:00      
   correction            01/01/70 00:00      
   my 2 cents            01/01/70 00:00      
   What is exactly RLY fuction?            01/01/70 00:00      
      Effect of relay            01/01/70 00:00      
         Isn't it called EMI?            01/01/70 00:00      
            Sure - radiated and conducted            01/01/70 00:00      
               Ok, thought so :)            01/01/70 00:00      
                  Maybe it's a test?            01/01/70 00:00      
                     Not very kind to operator :)            01/01/70 00:00      
         A diode helps.            01/01/70 00:00      
            But immunity is best!            01/01/70 00:00      
         Arcing machine            01/01/70 00:00      
            RF oscillations            01/01/70 00:00      
               School experiment            01/01/70 00:00      
   Ok, we posted in the same minute :)            01/01/70 00:00      
      This time it was Andy and AGAIN same time :)            01/01/70 00:00      
      I'll build in some random delay next time :-)            01/01/70 00:00      
   the solution will be here            01/01/70 00:00      
   I'm puzzled            01/01/70 00:00      
      It damps out the relay voltage spikes?            01/01/70 00:00      
         not much, if any - 33pF?            01/01/70 00:00      
            Should be a printing error.            01/01/70 00:00      
   let's focus            01/01/70 00:00      
      Of course it is possible.            01/01/70 00:00      
      why focus            01/01/70 00:00      
         because......            01/01/70 00:00      
            Part more susceptable to EMI?            01/01/70 00:00      
            'experiment' all you want            01/01/70 00:00      
            prevent problems            01/01/70 00:00      
      where did we not focus?            01/01/70 00:00      
         conclusion            01/01/70 00:00      
            You are a funny guy...            01/01/70 00:00      
               chips is different            01/01/70 00:00      
                  already answered            01/01/70 00:00      
                  That's the definition of "Unreliable"!!            01/01/70 00:00      
                  pure unadulterated male cow manure            01/01/70 00:00      
                     The Relay            01/01/70 00:00      
                        The purpose of a Watchdog            01/01/70 00:00      
                           Woof            01/01/70 00:00      
                              Grrr            01/01/70 00:00      
                                 Watchdog Hit Report            01/01/70 00:00      
                  Some hints...            01/01/70 00:00      
                     The decoupling Cap            01/01/70 00:00      
                        With shortest leads to Vcc and GND pins            01/01/70 00:00      
                     What software,Kai?            01/01/70 00:00      
                        Target            01/01/70 00:00      
                           yes            01/01/70 00:00      
                     Thankyou Kai            01/01/70 00:00      
   isn't it obvious?            01/01/70 00:00      
      No you missed that it is the coil...            01/01/70 00:00      

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