The PLL_CTRL_XTAL_TRIM register is usually used to adjust the frequency of the crystal, but sometimes we have found this doesn’t work. How can we solve this problem?
Check your crystal datasheet. RSL10 needs 8pF. (The trim range is from 6pF to 10pF for the internal cap). If the crystal can’t meet the requirement, you need to add an external cap for it, or change to using a suitable crystal.