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???
10/02/08 21:39
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 		 #158777 - i do not know your chip ...
Responding to: ???'s previous message
... but some derivativs have a few pins other than P0 without pullup. This will be mentioned in the datasheet. Also if you keep the processor in reset all pins other than P0 should be high, that will tell.

Erik

List of 29 messages in thread
TopicAuthorDate
lcd port switching problem            01/01/70 00:00      
   P0 does not have internal pull-ups            01/01/70 00:00      
   P1 or P2 should work similarly            01/01/70 00:00      
   i do know that about P0            01/01/70 00:00      
      But how about the control defs            01/01/70 00:00      
         yes i have moved them as well            01/01/70 00:00      
         here is the lcd part of the code            01/01/70 00:00      
            correct me if i am wrong            01/01/70 00:00      
               Tried everything?            01/01/70 00:00      
      Again, I guess you are mixing            01/01/70 00:00      
         could you please poin it out in the code            01/01/70 00:00      
   header file            01/01/70 00:00      
      the above show NOTHING, but here is a guess            01/01/70 00:00      
   hardware problem?            01/01/70 00:00      
      errors not consistent            01/01/70 00:00      
         I am somewhat puzzeled...            01/01/70 00:00      
            come conufusion with the file            01/01/70 00:00      
               My suggestion was to...            01/01/70 00:00      
                  will try that michael            01/01/70 00:00      
         Multimeter is enough            01/01/70 00:00      
            will try that out            01/01/70 00:00      
               Tests both sw and hw            01/01/70 00:00      
   lcd simulator (from keil)            01/01/70 00:00      
      i do not know your chip ...            01/01/70 00:00      
         keep in reset as in ?            01/01/70 00:00      
            if open collector supervisor and reset low            01/01/70 00:00      
   the lcd worked on P0 with pull ups            01/01/70 00:00      
      which processor?            01/01/70 00:00      
         AT89C52            01/01/70 00:00      

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