P0 does not have internal pull-ups

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??? 09/29/08 14:27 Read: times	#158645 - P0 does not have internal pull-ups Responding to: ???'s previous message
	see "the bible" here are the links to "the bible" Chapter 1 - 80C51 Family Architecture: http://www.nxp.com/acrobat_d...ARCH_1.pdf Chapter 2 - 80C51 Family Programmer’s Guide and Instruction Set: http://www.nxp.com/acrobat_d...UIDE_1.pdf Chapter 3 - 80C51 Family Hardware Description: http://www.nxp.com/acrobat_d...WARE_1.pdf

List of 29 messages in thread

Topic Author Date
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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Topic	Author	Date
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