Hello Team,
The SLAA340 describes a way to calibrate the the VLO frequency via the DCO calibrated values.
The routine is working fine, nevertheless I do not understand one thing.
There are three captures done.
The first is ignored and between the other two it is made the difference to see how many DCO cycles are within two VLO edges.
on the second capture I get normally around 100counts while on the third 900 counts. Considering a DCO frequency of 1MHz, I have difference of 800 counts, so about 12KHz. Which is ok.
What is not clear to me is why on the second capture the value is actually around 100 and not around ~800.
Can you comment it?
Thanks,
Mauro