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LMR60430-Q1: How does the chip recognize the output operating mode and configure?

Part Number: LMR60430-Q1

Dear team,

As we known, the LMR60430-Q1 device can be configured to operate in either fixed or adjustable output voltage modes. For fixed output voltages, simply connect the output voltage rail directly to the FB pin. When other output voltages are required, a resistor divider between the output voltage rail and ground with the FB pin as the center point set the output. 

My question is: How does the inside of the chip identify the current operating mode and FB pin connection? How are the internal circuits configured in different modes?

Thanks!

Regards,

Nora