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THVD1406: Why is placed a pull-up resistor in "R" signal?

Part Number: THVD1406

Hi all,

Reviewing the THVD1406 DATASHEET, I have seen in Figure 9-5 that a pull-up resistor of 10 kOhm is placed between R signal and VCC:

What is this resistor intended for?

Many thanks.