HD643303x Hitachi, HD643303x Datasheet - Page 140

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

Mode 1: Address output or generic input can be selected for each pin in port 1. A pin becomes an
address output pin if the corresponding P1DDR 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 P1DDR
bit must be set to 1. Figure 7-2 shows the pin functions in mode 1.
Modes 2 and 3 (Single-Chip Modes): Input or output can be selected separately for each pin in
port 1. A pin becomes an output pin if the corresponding P1DDR bit is set to 1, and an input pin if
this bit is cleared to 0. Figure 7-3 shows the pin functions in modes 2 and 3.
Port 1
Figure 7-3 Pin Functions in Modes 2 and 3 (Port 1)
Figure 7-2 Pin Functions in Mode 1 (Port 1)
Port 1
When P1DDR = 1
A (output)
A (output)
A (output)
A (output)
A (output)
A (output)
A (output)
A (output)
7
6
5
4
3
2
1
0
125
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
When P1DDR = 0
P1 (input)
P1 (input)
P1 (input)
P1 (input)
P1 (input)
P1 (input)
P1 (input)
P1 (input)
7
6
5
4
3
2
1
0