up down counter using pic12f609

Discussion in 'The Projects Forum' started by baker87, Nov 27, 2011.

  1. baker87

    Thread Starter New Member

    Nov 27, 2011
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    HI, i need to make an up/down counter using a pic12f609 to sn7447 BCD to 7-segment display to count from 0 to 9 and 9 to 0
    The control of the counting cycle must b done using two switches
    switch 1 = Up (0-9)
    switch 2 = down (9-0)
    the delay time is 1.5 sec using mplab assembly language
    am new to micro controller and i need some ideas to do this task . i have done this using 4-bit counter and bcd to seven segment display i just inverted QA an QD on the 4-bit counter using a Nand gate and D/U on the 4-bit counter is high to count from 0 to 9 and for 9 to 0 i connected the D/U to low . but using pic12f609 i have hard time writing a code for that ...
     
  2. SgtWookie

    Expert

    Jul 17, 2007
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    Is this a homework assignment? It kind of sounds like one.

    Do you have to use an actual 7-segment display, or can you make one from discrete LEDs?
    If the former, you'll have to use a 7447 or similar.
    If the latter, you could use Charlieplexing, and skip the 7447.
     
  3. baker87

    Thread Starter New Member

    Nov 27, 2011
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    yes i have to use actual 7-segment display and actual 7447
    This is actually a project that am working on but we have been just introduced to Micro controller and we have been doing only digital circuit design the whole time i can do this project using 4-bit counter and BCD to 7-segment display
     
  4. Markd77

    Senior Member

    Sep 7, 2009
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  5. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
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    It sounds like most of the assignment is for you to create an accurate 1.5mS delay and send a pulse out on a pin for the clock.

    The second part is instead of the switching the 7447 directly with gates & switches deciding the behavior, the PIC polls and debounces the switches and sets the appropriate lines high or low.
     
  6. SgtWookie

    Expert

    Jul 17, 2007
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    Whatever you do, make certain that:
    1) You use GP3 as an input, using a N.O. push button to short it to ground.
    2) Use a 10k pull-up resistor from GP3 to Vcc/Vdd.
    3) Disable the watchdog timer and reset features.
     
  7. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
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    How will he Learn anything if it doesn't randomly reset or not run at all? :p
     
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