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10MHz external clock support #271
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Hi,
Is it possible to add support for 10MHz external clock?
I am in need of a DS1642 programmer, and because it is a parallel memory with RTC, I need an MCU with more pins, so I remembered that I have an Atmega16 stored here.
Since the DS1642 has an RTC clock calibration adjustment, I thought I'd use a high-precision frequency counter to be more sure.
I found an example of a frequency meter that uses a 10MHz crystal, it can be seen here:
https://www.instructables.com/High-Resolution-Frequency-Counter/
The crystal oscillator is a TXCO for HackRF One, which I found on Aliexpress (10Mhz hackrf metal, 3v3):
https://www.aliexpress.com/item/32808097349.html
https://f1atb.fr/index.php/2020/05/26/tcxo-installation-on-hackrf/
And the access library in RAM memory is this:
https://github.com/Andy4495/ParallelEEPROM
P.S.:
The DS1642 does not provide calibration access, but the M48T02/M48T12, which is compatible, shows how to do it.
https://www.analog.com/media/en/technical-documentation/data-sheets/ds1642.pdf
https://www.st.com/resource/en/datasheet/m48t02.pdf
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