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You are here: Home / Topics / Please Help me On LCD Concept

Please Help me On LCD Concept

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Microcontroller › PIC › Please Help me On LCD Concept

  • This topic has 2 replies, 3 voices, and was last updated 8 years, 6 months ago by AJISH ALFRED.
Viewing 3 posts - 1 through 3 (of 3 total)
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  • July 13, 2013 at 12:48 pm #2536
    Naga Suresh
    Participant

    hi,

      im using 16×2 lines hd44780 lcd ,

     

    according to data sheet rs=0,r/w=1 high means read mode,this mode is used while reading busy flag,

     

    rs=1,r/w=1 means reading contents of the CGRAM,DDRAM…

     

    lcd is output device, what is the use of reading DDRAM/CGRAM contents? is there any real time application regarding this mode of operation??

    if yes please let me clarify what are they???

    February 3, 2014 at 5:18 pm #10923
    Ashutosh Bhatt
    Participant

    hello Suresh,

    you are correct. LCD is output device. reading the content of CGRAM / DDRAM is hardly used. how ever the option is given for any posibility. 

    February 4, 2014 at 6:09 am #10924
    AJISH ALFRED
    Participant

    Hi Naga,

    The reading option is normally used to check the ‘busy flag’. The LCD module is a very slow device. Once the data is written to it, the internal controller of it will take time to finish the display process of the same data. The user is allowed to write data again once the controller reset the ‘busy flag’ after processing the previous data.

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