• I am not sure what "the program needs to customize." means.

    It means you have to send configuration commands to the chip to get it to switch into 'automatic low power mode'. However as is often the case with documents like this they never explicitly tell you how to do it. Its a bit like saying 'to win the game put the king into checkmate', then you give a description of how every piece moves on the board 'The datasheet' and its left up to the user to descover the right sequence of moves.

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