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TPS63050: Dynamic Vout control via MCU

Part Number: TPS63050
Other Parts Discussed in Thread: TPS63000,

I need help to understand the circuit below. 

VOUT : 3.7V to 5V

VREG_MOD(from MCU) to FB : 0V to 3.3V

"Dynamically Adjustable Output Using TPS63000" are slightly different form below. 

TPS63050 VOUT - - - - - - OUT
| |
1M 180K
| |
FB - 180K - 18K - - MOD

In this case, I want know how it works. and what is considered as R1, R2, R3