6.13.5 Digital I/O (Link to User's Guide)

Up to eleven 8-bit I/O ports are implemented. For 128-pin options, ports P1 to P10 are complete, and port P11 is 6 bits wide. For 100-pin options, ports P1 to P7 are complete, port P8 is 2 bits wide, and ports P9, P10, and P11 are completely removed. Port PJ contains four individual I/O pins, common to all devices. All I/O bits are individually programmable.

• Any combination of input, output, and interrupt conditions is possible.
• Programmable pullup or pulldown on all ports.
• Programmable drive strength on all ports.
• Edge-selectable interrupt and LPM3.5, LPM4.5 wake-up input capability available for all bits of ports P1 and P2.
• Read-write access to port-control registers is supported by all instructions.
• Ports can be accessed byte-wise (P1 to P11) or word-wise in pairs (PA to PF).