micro controller

Discussion in 'Embedded Systems and Microcontrollers' started by parihar1988, Oct 31, 2012.

  1. parihar1988

    Thread Starter New Member

    Oct 30, 2012
    1
    0
    any one help me how to increase the input output port of micro controller..........as let us suppose a micro controller with 30 i/o and we have required more i/o for same micro controller then how it is increase i/o pin of that uc . please help me
     
  2. panic mode

    Senior Member

    Oct 10, 2011
    1,321
    304
    use multiplexing or shift registers.

    if using shift, check 74hx595 and 74hc597. you can cascade them to get any number of inputs and outputs at the expense of clock cycles needed to shift values in and out.
     
  3. Arm_n_Legs

    Active Member

    Mar 7, 2007
    183
    10
    If your microcontroller has I2C interface, you can use I2C I/O expander ICs.
     
  4. KrisBlueNZ

    Member

    Oct 17, 2012
    111
    14
    Texas Instruments and many other companies make serially interfaced I/O expanders. Go to digikey and search for "I/O expander". They have a whole category for these, with over a thousand part numbers.
     
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