[time-nuts] Frequency Counter using OCXO and MCU

Brian Lloyd brian at lloyd.com
Wed Mar 12 12:05:25 EDT 2014

On Wed, Mar 12, 2014 at 10:48 AM, d0ct0r <time at patoka.org> wrote:

> LCD connected to the same MCU. And it has relation to the core clock too.
> So, nothing on LCD before I reset entire MCU. I think initial incorrect
> core clock reading cause a lot of issues. Probably my only option will be
> to implement some external relay and timer to turn on MCU few seconds after
> OCXO. Or may be to put 10Mhz oscillator to PCB and connect OCXO output in
> parallel to it (not sure if its good idea or it will works).

Why not debounce reset from power-up using an RC network and a Schmitt
trigger? Set the time constant so that it will hold the mpu in reset until
power has been asserted long enough to ensure that the OCXO is producing

Brian Lloyd, WB6RQN/J79BPL
706 Flightline Drive
Spring Branch, TX 78070
brian at lloyd.com

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