HD6475328-CP10 HITACHI [Hitachi Semiconductor], HD6475328-CP10 Datasheet - Page 168

• Manufacturer Part Number: HD6475328-CP10
• Description: original Hitachi CMOS microcomputer unit (MCU)
• 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 9-5. In the
expanded modes it operates as the external data bus (D
as a general-purpose input/output port.
Outputs from port 3 can drive one TTL load and a 90pF capacitive load. They can also drive a
Darlington transistor pair.
Port
Pin Functions in Single-Chip Mode: In the single-chip mode (mode 7), each of the port 2
pins can be designated as an input pin or an output pin, as indicated in figure 9-4, by setting the
corresponding bit in P2DDR to “1” for output or clearing it to “0” for input.
3
P3
P3
P3
P3
P3
P3
P3
P3
Pin
Figure 9-4 Port 2 Pin Functions in Single-Chip Mode
7
6
5
4
3
2
1
0
/ D
/ D
/ D
/ D
/ D
/ D
/ D
/ D
Port
7
6
5
4
3
2
1
0
2
Figure 9-5 Pin Functions of Port 3
Expanded Modes
D
D
D
D
D
D
D
D
7
6
5
4
3
2
1
0
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
P2
P2
P2
P2
P2
4
3
2
1
0
151
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
7
– D
0
). In the single-chip mode it operates
Single-Chip Mode
P3
P3
P3
P3
P3
P3
P3
P3
7
6
5
4
3
2
1
0
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)