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H8/3028F 数据表(PDF) 283 Page - Renesas Technology Corp

部件名 H8/3028F
功能描述  Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
PDF  923 Pages
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制造商  RENESAS [Renesas Technology Corp]
网页  http://www.renesas.com
标志 RENESAS - Renesas Technology Corp

H8/3028F 数据表(HTML) 283 Page - Renesas Technology Corp

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Rev. 2.00, 09/03, page 253 of 890
8.3
Port 2
8.3.1
Overview
Port 2 is an 8-bit input/output port with the pin configuration shown in figure 8.2. The pin
functions differ according to the operating mode.
In modes 1 to 4 (expanded modes with on-chip ROM disabled), port 2 consists of address bus
output pins (A15 to A8). In mode 5 (expanded modes with on-chip ROM enabled), settings in the
port 2 data direction register (P2DDR) can designate pins for address bus output (A15 to A8) or
generic input. In modes 6 and 7 (single-chip mode), port 2 is a generic input/output port.
When DRAM is connected to areas 2 to 5, A12 to A8 output row and column addresses in read and
write cycles. For details see section 6.5, DRAM Interface.
Port 2 has software-programmable built-in pull-up transistors.
Pins in port 2 can drive one TTL load and a 90-pF capacitive load. They can also drive an LED or
a darlington transistor pair.
Port 2
P2 /A
P2 /A
P2 /A
P2 /A
P2 /A
P2 /A
P2 /A
P2 /A
7
6
5
4
3
2
1
0
15
14
13
12
11
10
9
8
P2 (input/output)
P2 (input/output)
P2 (input/output)
P2 (input/output)
P2 (input/output)
P2 (input/output)
P2 (input/output)
P2 (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)
15
14
13
12
11
10
9
8
Port 2 pins
Modes 6 and 7
Modes 1 to 4
P2 (input)/A
(output)
P2 (input)/A
(output)
P2 (input)/A
(output)
P2 (input)/A
(output)
P2 (input)/A
(output)
P2 (input)/A
(output)
P2 (input)/A
(output)
P2 (input)/A
(output)
7
6
5
4
3
2
1
0
Mode 5
15
14
13
12
11
10
9
8
Figure 8.2 Port 2 Pin Configuration



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