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BQ25910: question about 3 level convert ,during the work , how did the Cfly charge to VIN/2, who control the Cfly charge

Part Number: BQ25910

HI ,I have a question about  3 level convert.I have read about BQ25910 spec.

Before the 3 level convert start to work ,if D<0.5,the Voltage on Cfly is 0; Who charge it to VIN/2? 

I know during the first stage,the VIN charge the Cfly  to VIN/2.

Here is the question,how did the charge work?

why charge to VIN/2?

How to control charge?

who control the charge?

Why charge stop when the  Cfly charged to VIN/2? Why Vsw is VIN/2?