Datasheet

Digital I/O Operation

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NOTE: Writing to PxIESx

Writing to P1IES, or P2IES can result in setting the corresponding interrupt flags.

PxIESx PxINx PxIFGx

0 → 1 0 May be set

0 → 1 1 Unchanged

1 → 0 0 Unchanged

1 → 0 1 May be set

8.2.7.3 Interrupt Enable P1IE, P2IE

Each PxIE bit enables the associated PxIFG interrupt flag.

Bit = 0: The interrupt is disabled.

Bit = 1: The interrupt is enabled.

8.2.8 Configuring Unused Port Pins

Unused I/O pins should be configured as I/O function, output direction, and left unconnected on the PC

board, to prevent a floating input and reduce power consumption. The value of the PxOUT bit is irrelevant,

since the pin is unconnected. Alternatively, the integrated pullup/pulldown resistor can be enabled by

setting the PxREN bit of the unused pin to prevent the floating input. See the System Resets, Interrupts,

and Operating Modes chapter for termination of unused pins.

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Digital I/O SLAU144J–December 2004–Revised July 2013

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