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ADF4356 : changing mode , integer-N to francional-N, and the reverse

Hello,

I have a question about ADF4356 from our customer.
When he changes the mode, integer-N to fractional-N or fractional-N to integer-N, does he need to configure using "Initialization sequence"?
Or, does he able to use "Frequency Update sequence"?

Best regards,

y_suzuki