17.6.8.6 Loop Divider Ratio updates

The FDPLL96M supports on-the-fly update of the DPLLRATIO register, so it is allowed to modify the loop divider ratio and the loop divider ratio fractional part when the FDPLL96M is enabled. At that time, the DPLLSTATUS.LOCK bit is cleared and set again by hardware when the output frequency reached a stable state. The DPLL Lock Fail bit in the Interrupt Flag Status and Clear register (INTFLAG.DPLLLCK) is set when a falling edge has been detected. The flag is cleared when the software write a one to the interrupt flag bit location.
Figure 17-6. RATIOCTRL Register Update Operation