SN74LV165A-EP: Clarification on SER pin

Part Number:SN74LV165A-EP

Hi Team,

We'd like to get some clarification on the functionality of the SER pin (pin 10) on the SN74LV165A-EP. In the function table on page 2 of the datasheet, there is no mention on the operation of this pin.

Thanks in advance for your help,
Mitchell