HD643303x Hitachi, HD643303x Datasheet - Page 137

• Manufacturer Part Number: HD643303x
• Description: Hitachi Microcomputer
• Manufacturer: Hitachi

7.2 Port 1
7.2.1 Overview
Port 1 is an 8-bit input/output port with the pin configuration shown in figure 7-1. The pin functions
differ depending on the operating mode. In mode 1, they are address bus output pins (A
In modes 2 and 3, port 1 is a generic input/output port.
Pins in port 1 can drive one TTL load and a 90-pF capacitive load. They can also drive a darlington
transistor pair.
Port 1
Port 1 pins
P1 /A
P1 /A
P1 /A
P1 /A
P1 /A
P1 /A
P1 /A
P1 /A
7
6
5
4
3
2
1
0
Figure 7-1 Port 1 Pin Configuration
7
6
5
4
3
2
1
0
Modes 1
P1 (input)/A (output)
P1 (input)/A (output)
P1 (input)/A (output)
P1 (input)/A (output)
P1 (input)/A (output)
P1 (input)/A (output)
P1 (input)/A (output)
P1 (input)/A (output)
7
6
5
4
3
2
1
0
122
7
6
5
4
3
2
1
0
Modes 2 and 3
P1 (input/output)
P1 (input/output)
P1 (input/output)
P1 (input/output)
P1 (input/output)
P1 (input/output)
P1 (input/output)
P1 (input/output)
7
6
5
4
3
2
1
0
7
to A
0
).