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LCd (44780 controller)

Discussion in '8bit Microcontrollers' started by Martin Mehner, Sep 9, 2003.

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  1. Hi!

    help wanted! I have several (more thant 10 pieces now) of that 2x16
    char LCD here. In former times I wrote a pic assembly program that
    uses this one - worked great)
    I came up to use it again and: does not work!
    So i connected the display to an application known as working well and
    guess what: not working!
    I tried 10 different displays now all show the same behaviour.
    Anybody has a clou what went wrong?


    ps: I take the usually precaution to ESD. And I assume not ALL of the
    displays can be defective since they withstood all my "treatings" so

    -:- kill this line if u reply via email or the message will be filtered -:-
  2. Rich Webb

    Rich Webb Guest

    Not all 44780-style displays have the same characteristics for things
    like setup and hold time. If you can't get the docs for that specific
    display, try adding a couple of NOPs around the E strobe, etc. A good
    scope or logic analyzer might help show what's happening.

  3. I'll check that out thou I think it does not need a negative volage
    nor it#s a timing problem (I use a PIC clocked @4MHz so every
    instruciton is at least a 1us. But it's worth a try anyway).

    Thanks to all who answered so far.


    -:- kill this line if u reply via email or the message will be filtered -:-
  4. Rein Wiehler

    Rein Wiehler Guest

    have you used this exact model of LCD before?
    Compare the diferrent model numbers you have, not every LCD follows
    the same spec.
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