ADSP-BF609 EZ-Board

Hello.

I am reading the document "ADSP-BF609 EZ-KIT Lite® Evaluation System Manual" (www.analog.com/.../ADSP-BF609_ezkit_manual.pdf) and can’t understand, why the resistors R166, R167 are used on the page 84. 

Explain to me please, why connect resistors to GND?
What is controlled at the test point TP3?
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