Port 4 - Fujitsu F2MC-8L MB89620 Series Hardware Manual

5
4.

Port 4

Port 4 is a general-purpose I/O port that also serves as peripheral I/O. Each pin can be
switched between peripheral and port operation in bit units. This section principally
describes the port functions when operating as a general-purpose I/O port.
The section describes the port structure and pins, the pin block diagram, and the port
register for port 4.
n Structure of Port 4
Port 4 consists of the following two components:
• General-purpose I/O pins/peripheral I/O pins (P40 to P47/SI2)
• Port 4 data register (PDR4)
n Port 4 Pins
Port 4 consists of eight I/O pins of a hysteresis input and N-ch open-drain output type.
As P44/BZ to P47/SI2 also serve as peripheral I/O, these pins cannot be used as general-
purpose I/O ports when the corresponding peripheral is used.
Table 4.5a lists the port 4 pins.
Table 4.5a Port 4 Pin
Port
Port 4
Reference: See Section 1.7, "I/O Pins and Pin Functions" for a description of the circuit type.
104
CHAPTER 4 I/O PORTS
Pin name Function
P40
P40 General-purpose I/O
P41 P41 General-purpose I/O
P42 P42 General-purpose I/O
P43 P43 General-purpose I/O
P44/BZ
P44 General-purpose I/O
P45/SCK2
P45 General-purpose I/O
P46/SO2
P46 General-purpose I/O
P47/SI2
P47 General-purpose I/O
Shared peripheral
—
—
—
—
BZ Buzzer output
SCK2 Clock I/O for 8-bit serial I/O-2
SO2 Data output for 8-bit serial I/O-2
SI2 Data input for 8-bit serial I/O-2
I/O type
Circuit
type
Input Output
N-ch
G
Hysteresis
open-drain
MB89620 series