Panasonic MN101C77C User Manual

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Chapter 4    I/O Ports

Port 8

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General Port Setup

Each bit of the port 8 control I/O direction register (P8DIR) can be set individually to set each pin as input

or output. The control flag of the port 8 direction control register (P8DIR) is set to "1" for output mode, and

"0" for input mode.

To read input data of pin, set the control flag of the port 8 direction control register (P8DIR) to "0" and

read the value of the port 8 input register (P8IN).

To output data to pin, set the control flag of the port 8 direction control register (P8DIR) to "1" and write

the value of the port 8 output register (P8OUT).

Each pin can be set individually whether pull-up resistor is added or not, by the port 8 pull-up resistor control

register (P8PLU). Set the control flag of the port  8 pull-up resistor control register (P8PLU) to "1" to add

pull-up resistor.

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Special Function Pin Setup

P80 to P87 are used as LED driving pins, as well.