HD643303x Hitachi, HD643303x Datasheet - Page 146

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HD643303x

Manufacturer Part Number
HD643303x
Description
Hitachi Microcomputer
Manufacturer
Hitachi
Datasheet
7.4 Port 3
7.4.1 Overview
Port 3 is an 8-bit input/output port with the pin configuration shown in figure 7-7. Port 3 is a data
bus in mode 1 and a generic input/output port in modes 2 and 3.
Pins in port 3 can drive one TTL load and a 90-pF capacitive load. They can also drive a darlington
transistor pair.
7.4.2 Register Descriptions
Table 7-5 summarizes the registers of port 3.
Table 7-5 Port 3 Registers
Address*
H'FFC4
H'FFC6
Note: * Lower 16 bits of the address.
Port 3
Name
Port 3 data direction register
Port 3 data register
Figure 7-7 Port 3 Pin Configuration
Port 3 pins
P3 /D
P3 /D
P3 /D
P3 /D
P3 /D
P3 /D
P3 /D
P3 /D
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
Mode 1
D (input/output)
D (input/output)
D (input/output)
D (input/output)
D (input/output)
D (input/output)
D (input/output)
D (input/output)
131
7
6
5
4
3
2
1
0
Abbreviation
P3DDR
P3DR
R/W
W
R/W
Modes 2 and 3
P3 (input/output)
P3 (input/output)
P3 (input/output)
P3 (input/output)
P3 (input/output)
P3 (input/output)
P3 (input/output)
P3 (input/output)
7
6
5
4
3
2
1
0
Initial Value
H'00
H'00

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