AWRL6844: VPP usage confirmation

Part Number: AWRL6844

Tool/software:

HI everybody 

about Vpp , pn page 22  of datasheet I can see --"During normal operation, no voltage should be applied to VPP. "

so should I leave the pin unconnected in std usage ?  or should I have a pull up or down ? 

could you kindly elaborate a little ?

thank you 

BR


Carlo