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You are here: Home / Topics / pull up register doute

pull up register doute

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Microcontroller › 8051 › pull up register doute

  • This topic has 2 replies, 3 voices, and was last updated 12 years, 12 months ago by AJISH ALFRED.
Viewing 3 posts - 1 through 3 (of 3 total)
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  • June 24, 2012 at 11:40 am #1855
    ritesh
    Participant

    i use p89v51rd2 if it is require to use pull up register at port.

     

    i make led scrolling msg display.

     

    if i use latch 74ls573 then it also require to use pull up register?

     

    why pull up register is use.

    June 25, 2012 at 2:38 pm #8121
    Amrith
    Participant

    Ritesh,

    Pull up resistiors are necessary at the port because the port pins of the controller are open drain or open collector.

    Pull up register are used toenable internal pull up resistors.which deliver a very less current of about 2mA to 8mA. It is recommended to use external pull ups based on the load at pins.

    June 26, 2012 at 1:34 am #8127
    AJISH ALFRED
    Participant

     

    Hi Ritesh,

    This forum already have lot of posts related with the topic of pull up resistors

    Please find the following links

    http://www.engineersgarage.com/forums/8051/pull-resistor

    http://www.engineersgarage.com/forums/electronics/pull-up-and-pull-down-resistors

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