Functions Of I/O Port - Fujitsu F2MC-16LX Hardware Manual

CHAPTER 8 I/O PORT
8.1

Functions of I/O Port

This section outlines the functions of the I/O port.
I Functions of I/O port
The I/O port has functions to output data from the CPU to I/O pins and introduce the signals
input to I/O pins to the CPU by using the port register (PDR). Furthermore, the I/O port enables
input to and output from I/O pins to be set in any direction in units of bits by using the port
direction register (DDR).
The MB90470 has 82 input/output ports and two open-drain output pins.
Ports 0 to A are output ports, and P76 and P77 are open-drain pins.
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