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HMC983LP5E as a Frequency Divider


I'm trying use the HMC983LP5E as a standalone frequency divider. Now i have problems with the SPI.  I use a atxmega256a3u and I think the SPI is working. But I don't know how to set the Bits correctly. In Reg 05h I can set the Integer Division Ratio. But in Reg 01h I'm not sure which Bits to set. Does anyone did this before?

And there is the DNSAT pin. On page 15 it says that these pin should be connected to ground, but on page 26 it says that the AUXSPI clock is expected on the DNSAT pin. So what's the right way? 

I really hope someone can help me!

Thank you!