Are there any examples on implementing a 50Hz digital PLL using the Kenetis K60 MCU?
If there are any ready made ICs avalable from NXP it would be really helpfull.
I'm guessing you are looking to clean up the incoming zero crossing signal to synchronize with the line?
Synchronized Oscillator as shown in Figure-11 will make things a lot easier by starting with a clean signal.
Feed the signal into one of the Input Capture timer pins.
If dealing with three-phase will need two zero crossing detectors to determine phase rotation automatically.
This can also help as at some phase angles the transistors/SCRs will be firing at the zero crossing point on one of the phases.
Software Phase Locked Loop | Hackaday.io may be of some interest as well.
More on Synchronized Oscillators here:
My favorite Application Notes and Old Obscure Data Sheets
Retrieving data ...