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Pin11 serves as resonator input of Main Oscillator but synthesizer output is corralated by divider ratio and the reference oscillator frequency. Synthesizer frequency 32 or 64 times of the reference oscillator frequency so it's fixed by divison ratio and reference frequency.
To change the output frequency, the reference frequency that consists of a crystal oscillator ( or maybe similar external source ) should be changed and output frequency will be changed 32 times or 64 times of the reference depending on divison ratio..