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???
01/16/07 14:00
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 		 #130877 - "Bible" time.
Responding to: ???'s previous message
Why is connecting the P3.3 causing this ?

From the 80C51 Hardware description:

"Ports 1, 2, and 3 have internal pullups, ..."

It looks like your circuit does not sink enough current to drive the port anywhere.

List of 31 messages in thread
TopicAuthorDate
Zero Crossing detector woes            01/01/70 00:00      
   "Bible" time.            01/01/70 00:00      
      proper connecton 4n35?            01/01/70 00:00      
   Try MOC 3041 or MOC 3043            01/01/70 00:00      
   links            01/01/70 00:00      
   Why make simple matters worse?            01/01/70 00:00      
      I would never do this!            01/01/70 00:00      
         Sounds like a recipe for a Darwin Award.            01/01/70 00:00      
            Total agree!            01/01/70 00:00      
         i had did this with opampe !            01/01/70 00:00      
   Have tried out the suggestions!            01/01/70 00:00      
      It will get you 'excited' when you reverse the plu            01/01/70 00:00      
   Schematic Added - Am I asking for too much?            01/01/70 00:00      
      Been there; done that            01/01/70 00:00      
      Jerson is right            01/01/70 00:00      
      Post the code !here!            01/01/70 00:00      
   URL for schematic            01/01/70 00:00      
      You can avoid the bridge            01/01/70 00:00      
      You need a pull up            01/01/70 00:00      
      Will not work!            01/01/70 00:00      
         will work - 4511 has active "high" outputs            01/01/70 00:00      
            what is a 4511            01/01/70 00:00      
               It's a CD4511, of course            01/01/70 00:00      
                  of course?            01/01/70 00:00      
            No, it will not            01/01/70 00:00      
               agree            01/01/70 00:00      
         Mistake in writing            01/01/70 00:00      
   just remembered this one . Do not know if            01/01/70 00:00      
   Am making modifications            01/01/70 00:00      
      a few answers            01/01/70 00:00      
   It is a HEF4511B - sorry for the short form.            01/01/70 00:00      

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