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MSP430 devices have up to eight digital I/O ports implemented, P1 to P8. Each port has up to eight I/O pins. Every I/O pin is individually configurable for input or output direction, and each I/O line can be individually read or written to. Ports P1 and P2 have interrupt capability. Each interrupt for the P1 and P2 I/O lines can be individually enabled and configured to provide an interrupt on a rising edge or falling edge of an input signal. All P1 I/O lines source a single interrupt vector, and all P2 I/O lines source a different, single interrupt vector. The digital I/O features include: • Independently programmable individual I/Os • Any combination of input or output • Individually configurable P1 and P2 interrupts • Independent input and output data registers • Individually configurable pullup or pulldown resistors • Individually configurable pin-oscillator function (some MSP430 devices)
