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Quick LCD Question

Discussion in 'General Electronics Discussion' started by xxJaRxx, Jan 21, 2013.

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  1. xxJaRxx


    Oct 16, 2011

    I am looking to buy a bigger LCD to the one I have already.

    The one I already have has 11 pins that I use and I can program it happily:

    I followed this well known page to get things working (see for reference):

    My question is: Will the LCD below work the same as the one I have described above? There are more pins on that data sheet than on mine and none seem to be named the same - although having said that it does look relatively similar. Can anyone help me out?



    Last edited: Jan 21, 2013
  2. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    Nov 28, 2011
    It looks like the interfaces are slightly different. The HD44780 uses the old Motorola bus interface, which has an E clock, R/W and a single-bit "address" (register select). This device uses separate RD and WR signals and doesn't have an E clock. If you're driving those signals using bit-banging, you'll only need a small change to your code.

    The registers may be different too. Have a look at the data sheet and app notes for the T6963C device used in that module. Also, if you're using 4-bit access, make sure that the new device supports that as well.
  3. xxJaRxx


    Oct 16, 2011
    Thanks for the reply KrisBlueNZ.

    Yes I am bit-banging the pins in order to drive the controller/LCD and I have found it an extremely simple and very effective way of displaying stuff on the LCD.

    So I'd like to keep the parallel coms with the new LCD if possible and it would be nice if the interface and instruction sets were similar too. From the above quote; it's very positive that this may be the case.

    I will read over the two links and I'm sure post back with a few questions :)

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