CC2640R2F: HOW can the CC2640R2F goes into power saving mode

Part Number:CC2640R2F

Hi:

  I want my CC2640R2F works in the lowest power consumption mode when it is not busy, what should I setting on my code. Does only open the predefined symbol POWER_SAVING ? Does TI have any development manual document about how to coding the power managerment? 

 my SDK version is :simplelink_cc2640r2_sdk_2_30_00_28 (simple_peripheral project)

Thanks!