[time-nuts] Frequency counter questions

Jerry Hancock jerry at hanler.com
Wed Apr 26 13:06:27 UTC 2017


I don’t know what I was thinking when I asked this question as we don’t control the gate timing in a referenced counter.


> On Apr 26, 2017, at 3:59 AM, Bob kb8tq <kb8tq at n1k.org> wrote:
> 
> Hi
> 
>> On Apr 26, 2017, at 12:29 AM, Jerry Hancock <jerry at hanler.com> wrote:
>> 
>> Do typical  frequency counters start their gate in phase with the incoming signal?  I guess the 
>> answer would be, "It depends."  I was just thinking about how I would program the STM32F7 
>> counter I am designing.
> 
> Since they don’t start (or stop) the gate in any specific relation to the input signal, the trick is to
> make sure you don’t get an extra count when the gate opens or closes. This is right back to the
> edge triggered vs level triggered issue. It also gets indirectly into the rechecking process in the
> MCU. Some of the “edge trigger” stuff is done in odd ways ….(= got two of the same after rechecking
> into a shift register …).
> 
> Bob
> 
> 
>> 
>> btw, Gilbert, a local time-nut, sold me a 5335 today so I will be able to buiild one great one 
>> out of the two I will have.
>> 
>> Jerry
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