FREQ COUNTER help

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.

Paul

Reply to
Paul Taylor
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"Paul Taylor"

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

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

Reply to
Phil Allison

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.

--
Bill Sloman, Nijmegen
Reply to
bill.sloman

sorry typo error 65536 (2 to the power of 16)

Reply to
Paul Taylor

Phil are these regularly available any where?

Reply to
Paul Taylor

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

Reply to
Paul Taylor

"Paul Taylor"

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

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

Plus:

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

So far you are just like any other PITA troll.

......... Phil, grrrrrrrrrrr

Reply to
Phil Allison

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

Not JUST another EVIL top poster, but a f****it BLANK PAGE poster too.

Observe usenet etiquette - or GO DROP DEAD !!

........ Phil

Reply to
Phil Allison

Thanks for your kind remarks Phil i hope i have it right this time?

Reply to
Paul Taylor
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Paul Taylor BSC (Hons)
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Reply to
Paul Taylor

** Wot a complete fool.

........ Phil

Reply to
Phil Allison

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You assume you could...
Reply to
John Fields

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Not yet.

Try bottom posting and you\'ll be closer.
Reply to
John Fields

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.

Thanks

by the way what is a troll?

Reply to
Paul Taylor

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Please bottom post.

OK, so your high frequency is 65536Hz.  What\'s your low frequency?
Reply to
John Fields

Oh Dear

formatting link

martin

Reply to
martin griffith

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?

Thanks

Reply to
Paul Taylor

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.

Meindert

Reply to
Meindert Sprang

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

Reply to
Paul Taylor

i think this is right thanks for all your help i have now mastered writing to a newsgroup

Reply to
Paul Taylor

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