steht im UserGuide...
z.B. für den MSP430F449
Interrupt Flag Registers P1IFG, P2IFG
Each PxIFGx bit is the interrupt flag for its corresponding I/O pin and
when the selected input signal edge occurs at the pin. All PxIFGx
flags request an interrupt when their corresponding PxIE bit and the GIE
are set. Each PxIFG flag must be reset with software. Software can also
each PxIFG flag, providing a way to generate a software-initiated
Bit = 0: No interrupt is pending
Bit = 1: An interrupt is pending
Only transitions, not static levels, cause interrupts. If any PxIFGx
set during a Px interrupt service routine or is set after the RETI
a Px interrupt service routine is executed, the set PxIFGx flag
another interrupt. This ensures that each transition is acknowledged.
Software can also set each PxIFG flag, providing a way to generate a software-initiated interrupt.