HD6433045 HITACHI [Hitachi Semiconductor], HD6433045 Datasheet - Page 266

• Manufacturer Part Number: HD6433045
• Description: Hitachi Single-Chip Microcomputer
• Manufacturer: HITACHI [Hitachi Semiconductor]

9.4 Port 3
9.4.1 Overview
Port 3 is an 8-bit input/output port with the pin configuration shown in figure 9-3. Port 3 is a data
bus in modes 1 to 6 (expanded modes) and a generic input/output port in mode 7 (single-chip
mode).
Pins in port 3 can drive one TTL load and a 90-pF capacitive load. They can also drive a
darlington transistor pair.
9.4.2 Register Descriptions
Table 9-5 summarizes the registers of port 3.
Table 9-5 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 9-3 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
15
14
13
12
11
10
9
8
Modes 1 to 6
D
D
D
D
D
D
D
D
253
15
14
13
12
11
10
9
8
Abbreviation
P3DDR
P3DR
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
R/W
W
R/W
Mode 7
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