document changes to UPB3 for use with LDC on top
For use with LDC the UPB3 board should connect the input voltage to Pin 2 of the CBPROG connector and two GPIOs to Pin 8 and 10 for frequency switching
For use with LDC the UPB3 board should connect the input voltage to Pin 2 of the CBPROG connector and two GPIOs to Pin 8 and 10 for frequency switching