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???
11/24/04 14:27
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 		 #81850 - configuration again
Responding to: ???'s previous message
hi,

...however 8052 detects a negative going pulse on P3.2 and latches the IE0 bit.


Only if external interrupt is configured correctly! It is why I asked you about external interrupt configuration. By default, TCON activated with zero value. As result, IT0 is set to 0 after reset. So, if you do not set bit IT0 in TCON manually then IE0 does not indicate negative edge transition. When IT0 is 0 then IE0 just copies invert state of pin /INT0. And you is not able to clean it with IE0=0; - when IT0=0 then IE0 keeps state =1 as long as /INT0 pin is low (due level sensetive detector is used).

Regards,
Oleg

List of 42 messages in thread
TopicAuthorDate
Thyristor output flickering.            01/01/70 00:00      
   Thyristor problem            01/01/70 00:00      
      No Hardware problem            01/01/70 00:00      
      Please Elaborate more.            01/01/70 00:00      
   Thyristor problem            01/01/70 00:00      
      Re: Thyristor Problem.            01/01/70 00:00      
      Mains looks seldom like pure sinus            01/01/70 00:00      
         Thanks Kai But problem seems diffrent            01/01/70 00:00      
   Did the changes but still flickering.            01/01/70 00:00      
      Did the changes ....            01/01/70 00:00      
         Russell- Where can I get DSO software            01/01/70 00:00      
   More thoughts on filtering            01/01/70 00:00      
   Flickering is not minor.            01/01/70 00:00      
      Cool Edit            01/01/70 00:00      
         Cool Edit - no more :-(            01/01/70 00:00      
         Loading is enough.            01/01/70 00:00      
      interrupt configuration            01/01/70 00:00      
         I am not using External Interrupts.            01/01/70 00:00      
            external interrupt            01/01/70 00:00      
               I am reading only the edge detect flag.            01/01/70 00:00      
                  configuration again            01/01/70 00:00      
                     Here is the configuration.            01/01/70 00:00      
   Is it Int. prioprity setting proble?            01/01/70 00:00      
      Why not use the PCA?            01/01/70 00:00      
         It's too late to change the design.            01/01/70 00:00      
   Its not a interrupt priority problem.            01/01/70 00:00      
      Real -time problems            01/01/70 00:00      
   Tried PCA!            01/01/70 00:00      
      Firing circuit            01/01/70 00:00      
      hardware modification            01/01/70 00:00      
         Already modified with PCA SYSTIME>99            01/01/70 00:00      
      Sorry I small typpo in earlier post.            01/01/70 00:00      
   ideas            01/01/70 00:00      
      Problem Solving Great Idea            01/01/70 00:00      
   Assymetry            01/01/70 00:00      
   back to root            01/01/70 00:00      
      It is for power control.            01/01/70 00:00      
   Hey Friends Problem Solved.            01/01/70 00:00      
   Happiness is...            01/01/70 00:00      
      Oh sure....            01/01/70 00:00      
   here i am?            01/01/70 00:00      
      Thanks Kuldeep.            01/01/70 00:00      

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