MOD-60 counter

Discussion in 'Homework Help' started by 123456, Oct 31, 2006.

  1. 123456

    Thread Starter New Member

    Jul 24, 2006
    i'm using a MOD-6 driving a MOD-10, currently using two IC (54/LS93)
    no problem with the counting up.
    but i wish to add a 'RESET' & 'PAUSE' to it, & i'm lost!!!
    please help.

    RESET : when i press it, numbers will auto reset to 00
    PAUSE : when i press it, number will stop counting, but when i press 'PASUE'
    again, numbers will continue counting up.

  2. n9352527

    AAC Fanatic!

    Oct 14, 2005
    I think the LS93 has a reset input, named something like master reset. You just need to wire it up to a push button configured for the required signal level and with appropriate debouncing.

    To implement pause, just AND the counted signal with another signal from a push button (debouncing required) such that when the button is pressed the push button signal is low.
  3. beenthere

    Retired Moderator

    Apr 20, 2004

    Taking pins 2 & 3 high will reset the counter. The pause function can be done by changing the input on one pin of a gate so it jams high and keeps the clock pulses from getting to pin 14 (or 1).

    You will need a good debpuncer for you pushbutton. The 7490 was famous for catching any and every glitch that came its way. Look at a LS279 for the debounce function. That give you 4 R-S latches. You can do the same with one LS00.