TMS320F28069: F28069

Part Number:TMS320F28069

Hello all,

We are currently working with the F28069 controlStick and would like to supply the controlStick with an external power source. We have a buck converter which converts our voltage from 15V to 5V. On the PIN-OUT TABLE of the F28069 there is the GPIO16 with 5.0V but it´s disabled by default. Does anybody know how to active this pin or is this pin permanently switched off? 

Thanks in advance.