MSP430F5438A logic low & high voltage

Hi,

I'm trying to find the max voltage that the inputs of the MSP430f5438A can get.

I find the "Schmitt-Trigger Inputs – General Purpose I/O" section on the Data Sheet.

1) I want to ask if I understood correctly: the threshold voltage that wrote there means the minimal voltage to considered high?

2) what is the maximal input voltage that I can give? its equal to the supply voltage?

3) all the digital I/O pins use that Schmitt-Trigger? i need to config it or its built-in and can't be changed?

4) Could I connect a sensor that will give a 5V pulse? I want to give 3.3V suplly. 

5) If i couldn't - How I can connect it?

thanks.