Perform the following steps to modify PLLDIV.
- Check that the GOSTAT bit in PLLSTAT is cleared
to show that no GO operation is currently in progress.
- Program the RATIO field in PLLDIVn to the desired
new divide-down rate. If the RATIO field changed, the PLL Controller will flag
the change in the corresponding bit of DCHANGE.
- Set the respective ALN n bits in ALNCTL to
align any SYSCLKs after the GO operation.
- Set the GOSET bit in PLLCMD to initiate the GO
operation to change the divide values and align the SYSCLKs as programmed.
- Read the GOSTAT bit in PLLSTAT to make sure the
bit returns to 0 to indicate that the GO operation has completed.