According to the crossbar table, UART0 has the highest priority, so that if it is set up, UART0 will always use P0.0 and P0.1. The SPI bus has the next priority. If UART0 is not used the SPI starts with P0.0, otherwise it will use P0.2 - P0.5. You cannot change the crossbar priority. For this reason you have to carefully plan your project I/O pin usage. If, for example, during developement you find that you will need the External Counter Input (ECI) then that will affect the pins used by lower priority devices. In your case INTO and INT1 pins will change by one position. If you later decide to use UART0 then everything moves down by two pins.

Hal