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???
10/01/08 03:08
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 		 #158715 - i do know that about P0
Responding to: ???'s previous message
yes i do know that p0 does not have internal pull up resistors while p1 and p2 have them . but what i want to know why is the LCD working flawlessly in p3 and not in p1 or p2 .
i really want to use the interrupts .. is it possible to use both the lcd and the interrupts at the same time ?
i have gone through my code several times i have referenced the port only once in the header file .

#define lcd_port p3


but when i change it to p1 or p2 i either get junk data on the screen or the lcd doesn't initialize .





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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