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H8/3021 Datasheet(PDF) 157 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) 157 Page - Renesas Technology Corp

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7. I/O Ports
Rev.2.00 Mar. 22, 2007 Page 133 of 684
REJ09B0352-0200
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 between the expanded modes with on-chip ROM disabled, expanded modes with
on-chip ROM enabled, and single-chip mode. In modes 1, 3 (expanded modes with on-chip ROM
disabled), they are address bus output pins (A
7 to A0).
In modes 5 and 6 (expanded modes with on-chip ROM enabled), settings in the port 1 data
direction register (P1DDR) can designate pins for address bus output (A
7 to A0) or generic input.
In mode 7 (single-chip mode), 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
P1 /A
P1 /A
P1 /A
P1 /A
P1 /A
P1 /A
P1 /A
P1 /A
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
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
A (output)
A (output)
A (output)
A (output)
A (output)
A (output)
A (output)
A (output)
7
6
5
4
3
2
1
0
Port 1 pins
Mode 7
Modes 1 and 3
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
Modes 5 and 6
7
6
5
4
3
2
1
0
Figure 7.1 Port 1 Pin Configuration
7.2.2
Register Descriptions
Table 7.2 summarizes the registers of port 1.



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