HD643303x Hitachi, HD643303x Datasheet - Page 144

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

Mode 1: Address output or generic input can be selected for each pin in port 2. A pin becomes an
address output pin if the corresponding P2DDR bit is set to 1, and a generic input pin if this bit is
cleared to 0. Following a reset, all pins are input pins. To use a pin for address output, its P2DDR
bit must be set to 1. Figure 7-5 shows the pin functions in mode 1.
Modes 2 and 3: Input or output can be selected separately for each pin in port 2. A pin becomes an
output pin if the corresponding P2DDR bit is set to 1, and an input pin if this bit is cleared to 0.
Figure 7-6 shows the pin functions in modes 2 and 3.
Port 2
Figure 7-6 Pin Functions in Modes 2 and 3 (Port 2)
Figure 7-5 Pin Functions in Mode 1 (Port 2)
Port 2
When P2DDR = 1
A
A
A
A
A
A
A (output)
A (output)
15
14
13
12
11
10
9
8
(output)
(output)
(output)
(output)
(output)
(output)
129
P2 (input/output)
P2 (input/output)
P2 (input/output)
P2 (input/output)
P2 (input/output)
P2 (input/output)
P2 (input/output)
P2 (input/output)
7
6
5
4
3
2
1
0
When P2DDR = 0
P2 (input)
P2 (input)
P2 (input)
P2 (input)
P2 (input)
P2 (input)
P2 (input)
P2 (input)
7
6
5
4
3
2
1
0