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Discussion in 'Electronic Design' started by Paul Taylor, Jul 17, 2006.

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  1. Paul Taylor

    Paul Taylor Guest

    Hi i am presently trying to build a counter that counts freq upto 65536 Khz
    in less than 1 msec is this possible also has any one any ideas to where i
    should start thanks in advance for your help.

  2. Phil Allison

    Phil Allison Guest

    "Paul Taylor"

    ** You need a " period counter " - some frequency counters have this

    Instead of totalling up completed cycles over 1 second, a very high
    frequency oscillator is gated *on* for one cycle ( or 10 or 100) to count
    microseconds and decimal divisions thereof.

    If you get 15.259 uS - you are home and hosed.

    ........ Phil
  3. Guest

    Obviously enugh, a counter driven at 65536kHz - I presume you mean
    65.536MHz - will accumulate 65536 counts in one millisecond.

    You will need a stable local oscillator to define your millisecond -
    traditionally divided down from a 10MHz crystal oscillator, but more
    precise solutions are available.

    A 16-bit wide synchronous counter capable of running at 66MHz isn't
    entirely trivial. Just stringing together regular TTL or CMOS parts
    won't work, because the freely available 74F and 74ACT and similar
    synchronous counters aren't quite fast enough. Making the first stage
    of your counter out of a separately packaged JK-flip-flop might be
    enough to get you over the hump, but most of the recent programmalbe
    logic parts are fast enough and big enough t let you realise a suitable
    16-bit synchronous counter in a single package.

    I would help if you told us more about what you are trying to do.
  4. Paul Taylor

    Paul Taylor Guest

    sorry typo error 65536 (2 to the power of 16)
  5. Paul Taylor

    Paul Taylor Guest

    Phil are these regularly available any where?
  6. Paul Taylor

    Paul Taylor Guest

    Phil do you have any examples ect.... this sounds like the way i should go
  7. Phil Allison

    Phil Allison Guest

    "Paul Taylor"

    ** Top posting is both a usenet crime and an insult to others.

    STOP IT NOW !!!!!!!!!!!!


    EXPLAIN what the **** you ACTUALLY want and WHY !!

    So far you are just like any other PITA troll.

    .......... Phil, grrrrrrrrrrr
  8. Phil Allison

    Phil Allison Guest

    ** YOU are just BEGGING for it - Mr pommy arsehole.

    Not JUST another EVIL top poster, but a fuckwit BLANK PAGE poster too.

    Observe usenet etiquette - or GO DROP DEAD !!

    ......... Phil
  9. Paul Taylor

    Paul Taylor Guest

    Thanks for your kind remarks Phil i hope i have it right this time?
  10. Paul Taylor

    Paul Taylor Guest


    Paul Taylor BSC (Hons)
    Electronics Technician
    School of Environmental Science
    University of East Anglia
    NR4 7TJ

    Phone: +44 (0)1603 592502
    Fax: +44 (0)1603 591327

  11. Phil Allison

    Phil Allison Guest

    ** Right up you stupid fucking arse - you smug, autistic pommy pig.

    ........ Phil
  12. Phil Allison

    Phil Allison Guest

    ** Wot a complete fool.

    ......... Phil
  13. John Fields

    John Fields Guest

  14. John Fields

    John Fields Guest

  15. Paul Taylor

    Paul Taylor Guest

    Phil im not a troll, i am interested in the period counter concept you said
    about i searched the web and cant seem to find much about it.


    by the way what is a troll?
  16. John Fields

    John Fields Guest

  17. Oh Dear

  18. Paul Taylor

    Paul Taylor Guest

    Thanks for that martin so im some bad furry creature......

    Sorry john for top posting i think i have got to grips with this newsgroup
    business now my bottom limit is basically 1hz with a resolution of 1hz to.
    any of you guys now about period counters Phil was saying that this could be
    the way to go?

  19. No, you've got to get grips with your news reader. Simply move the cursor to
    the bottom of the original text before starting to type (after deleting
    irrelevant text). Simple.

  20. Paul Taylor

    Paul Taylor Guest

    is this ok? i get help hopefully in the end for the problem i firsted posted
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