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external ROM for data storage

yashket gupta

hi
i am doing a project where i have to read a 2 byte hex code from a Card reader , in an external ROM create a table with every code corresponding to a num , once the code is read extract the corresponding num and display it . i am using 8255 and using 2 of its ports to read the code and one port to connect to a display unit having 5 seven segment displays . is this the most efficient way for this application . i am a amature in this field and am finding the programming part a bit difficult

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  • 0 in reply to erik malund

    hi
    actually i plan to use a NVRAM

    my application is to create a attendance sheet for a company . They are using punch card readers with a 2 byte code.. i plan to use there existing card reader and display. read it using 8051 and store the attendance timing in the RAM , and transfer the days attendance over RS-485 to a PC
    i am making this application for my undergraduate project for B-Tech degree . o know C pretty Well but having difficulties in understandin embedded C for KEIL uvision due to lack of any books or guidance.
    can u suggest me any books for the same

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  • 0 in reply to erik malund

    hi
    actually i plan to use a NVRAM

    my application is to create a attendance sheet for a company . They are using punch card readers with a 2 byte code.. i plan to use there existing card reader and display. read it using 8051 and store the attendance timing in the RAM , and transfer the days attendance over RS-485 to a PC
    i am making this application for my undergraduate project for B-Tech degree . o know C pretty Well but having difficulties in understandin embedded C for KEIL uvision due to lack of any books or guidance.
    can u suggest me any books for the same

Children