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H8/3028F Datasheet(PDF) 280 Page - Renesas Technology Corp

No. de pieza H8/3028F
Descripción Electrónicos  Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
PDF  923 Pages
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Fabricante Electrónico  RENESAS [Renesas Technology Corp]
Página de inicio  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8/3028F Datasheet(HTML) 280 Page - Renesas Technology Corp

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Rev. 2.00, 09/03, page 250 of 890
8.2
Port 1
8.2.1
Overview
Port 1 is an 8-bit input/output port also used for address output, with the pin configuration shown
in figure 8.1. 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 to 4 (expanded
modes with on-chip ROM disabled), they are address bus output pins (A7 to A0).
In mode 5 (expanded modes with on-chip ROM enabled), settings in the port 1 data direction
register (P1DDR) can designate pins for address bus output (A7 to A0) or generic input. In modes 6
and 7 (single-chip mode), port 1 is a generic input/output port.
When DRAM is connected to area 2, 3, 4, 5, A7 to A0 output row and column addresses in read
and write cycles. For details see section 6.5, DRAM Interface.
Pins in port 1 can drive one TTL load and a 90-pF capacitive load. They can also drive an LED or
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
Modes 6 and 7
Modes 1 to 4
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
Mode 5
7
6
5
4
3
2
1
0
Figure 8.1 Port 1 Pin Configuration



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