Data sheet SLASE66A (revised May 2015) for MSP430FR58xx and MSP430FR59xx parts section 6.11.1 under Digital I/O specifies:
- Any combination of input, output, and interrupt conditions is possible.
However, looking at the registers for the digital I/O ports (see section 6.13.1), I see that only ports 1-4 have the necessary registers for enabling interrupts on the pins (see for example table 6-48), and only ports 1-4 have interrupt vector registers (see table 6-3).
Can you confirm that only ports 1-4 have interrupt capabilities?