6.1 Introduction ................................................................... 6-3 6.2 Registers ........................................................................ 6-4 6.2.1 Direction Registers (PxDIR)...................................... 6-4 6.2.2 Input Registers (PxIN).............................................. 6-4 6.2.3 Output Registers (PxOUT)......................................... 6-4 6.2.4 Pull-up / Pull-down Resistor Enable Registers (PxREN) .............................................................................. 6-5
