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If you are using 20706 for your work, then you must have a reference schematic (including the 24MHz crystal as well as the tuning capacitors). My advice is that use those recommended values and parts from the BoM, especially the crystal which is a high-quality part (+/- 10ppm). These component values have been tuned and optimized for the normal operation of the chip. You should not need to do any fine tuning.
As this forum supports only 20736/7, please refer to our Korean Cypress contact whom you are working with for more information.