HD643303x Hitachi, HD643303x Datasheet - Page 140
HD643303x
Manufacturer Part Number
HD643303x
Description
Hitachi Microcomputer
Manufacturer
Hitachi
Datasheet
1.HD643303X.pdf
(572 pages)
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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
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