MSP432 PORT3 PIN0 doesnt tend high, even if register tells so

Hi Guys,

I am a little bit confused here. As I need PORT3 PIN0 as a chip select port for SPI I defined HIGH and LOW macros with the appropriate driver lib functions. As I was debugging my program, I wondered why the chip select doesn't go high, even if the register value is 1. So I started to measure, but the PIN actually isn't on Vcc. 

How is this possible..even if the register value tells the opposite. 

I am unfortunetely using an XMS-chip version on a custom board.

best regards

Benni