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EM32100 LCD Display

Discussion in 'Microcontrollers, Programming and IoT' started by Silent Ace, May 21, 2013.

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  1. Silent Ace

    Silent Ace

    1
    0
    May 21, 2013
    Hello Forum Members,

    I happen to have a EM32100 LCD Display laying around from an old telephone and would like to make it show digits with the Arduino. Well i managed to change between the clock and stopwatch and set the clock. However this is fairly easy to do. The link below is the documentation of the display, but i can't figure out where the latch pin is (if any). There is a Serial data input pin for sending bits and making some tests unfortunately i haven't manage to display anything. Can someone point out where the necessary pins are and how i can shift them out? I am learning from this example: http://arduino.cc/en/Tutorial/ShiftOut

    EM32100 documentation: http://www.datasheetcatalog.org/datasheets/400/238699_DS.pdf

    Thanks
     
  2. gorgon

    gorgon

    603
    24
    Jun 6, 2011
    You need to take a look at page4/5 where the serial interface is described. As far as I understand you just fill the display from right, so the first digit is the leftmost digit in the number. I may be wrong here.

    You use code 001111 to clear the display.

    The serial format is a subversion of a standard serial format. The only real difference is the full cycle for both the startbit and the stopbit(256Hz). You send only 6 bit data in each character. The speed is slow with a bit length of 3.9ms. Due to the low speed you should be able to make a bit-bang software UART for the communication.

    And, there is no latch input here, all is done via the serial interface signal SDI.
     
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