[time-nuts] precision timing pulse

Tom Van Baak tvb at LeapSecond.com
Thu Nov 17 17:07:39 EST 2016


If the OP would contact me I would be happy to make a new PIC divider for his specific purpose. I do this all the time. It usually only takes a few minutes.

On the PIC 12F675, pin5 / GP2 is Schmitt trigger. See page 8 of 41190F-PIC-12F629-675.pdf

But for push-button-start sorts of things input conditioning is unnecessary. It's only when a button is both start and stop or increment or decrement that you need to debounce and all that stuff.

/tvb

----- Original Message ----- 
From: "Bryan _" <bpl521 at outlook.com>
To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
Sent: Thursday, November 17, 2016 1:26 PM
Subject: Re: [time-nuts] precision timing pulse


> Tom:
> 
> 
> As you were gracious to release the source code for these excellent little dividers, I would suspect someone who is somewhat fluent in assembly could just modify so it counts a specific number of pulses and then toggles a output off. The ARM could be used to restart etc. Although I think the OP wanted to know the time taken between a run of a number of cycles.
> 
> 
> Been playing around with the PD15 to replace 2 -14 pin clock dividers and it seems to work like a charm, although I can't seem to find any information if the inputs on a 12F675 are Schmitt trigger inputs. Can't seem to find anything in the datasheet.
> 
> 
> -=Bryan=-



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