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H8/3021 Datasheet(PDF) 167 Page - Renesas Technology Corp

Part # H8/3021
Description  16-Bit Single-Chip Microcomputer
PDF  712 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8/3021 Datasheet(HTML) 167 Page - Renesas Technology Corp

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7. I/O Ports
Rev.2.00 Mar. 22, 2007 Page 143 of 684
REJ09B0352-0200
7.4
Port 3
7.4.1
Overview
Port 3 is an 8-bit input/output port with the pin configuration shown in figure 7.9. Port 3 is a data
bus in modes 1, 3, 5, and 6 (expanded modes) and a generic input/output port in mode 7 (single-
chip mode).
Pins in port 3 can drive one TTL load and a 90-pF capacitive load. They can also drive a
Darlington transistor pair.
Port 3
P3 /D
P3 /D
P3 /D
P3 /D
P3 /D
P3 /D
P3 /D
P3 /D0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
P3 (input/output)
P3 (input/output)
P3 (input/output)
P3 (input/output)
P3 (input/output)
P3 (input/output)
P3 (input/output)
P3 (input/output)
7
6
5
4
3
2
1
0
D
(input/output)
D
(input/output)
D
(input/output)
D
(input/output)
D
(input/output)
D
(input/output)
D
(input/output)
D
(input/output)
7
6
5
4
3
2
1
0
Port 3 pins
Mode 7
Modes 1, 3, 5, and 6
Figure 7.9 Port 3 Pin Configuration
7.4.2
Register Descriptions
Table 7.5 summarizes the registers of port 3.
Table 7.5
Port 3 Registers
Address*
Name
Abbreviation
R/W
Initial Value
H'FFC4
Port 3 data direction register
P3DDR
W
H'00
H'FFC6
Port 3 data register
P3DR
R/W
H'00
Note:
*
Lower 16 bits of the address.



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