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H8/3003 数据表(PDF) 258 Page - Renesas Technology Corp

部件名 H8/3003
功能描述  microcontroller (MCU)
PDF  715 Pages
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制造商  RENESAS [Renesas Technology Corp]
网页  http://www.renesas.com
标志 RENESAS - Renesas Technology Corp

H8/3003 数据表(HTML) 258 Page - Renesas Technology Corp

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9.2 Port 4
9.2.1 Overview
Port 4 is an 8-bit input/output port with the pin configuration shown in figure 9-1. The pin
functions differ between the 8-bit and 16-bit bus modes.
When the bus width control register (ABWCR) designates areas 0 to 7 all as 8-bit-access areas,
the H8/3003 operates in 8-bit bus mode and port 4 is a generic input/output port. When at least
one of areas 0 to 7 is designated as a 16-bit-access area, the H8/3003 operates in 16-bit bus mode
and port 4 becomes the lower data bus.
Port 4 has software-programmable built-in pull-up transistors.
Pins in port 4 can drive one TTL load and a 90-pF capacitive load. They can also drive a
darlington transistor pair.
Figure 9-1 Port 4 Pin Configuration
Port 4
P4 /D
P4 /D
P4 /D
P4 /D
P4 /D
P4 /D
P4 /D
P4 /D
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
P4 (input/output)
P4 (input/output)
P4 (input/output)
P4 (input/output)
P4 (input/output)
P4 (input/output)
P4 (input/output)
P4 (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 4 pins
8-bit bus mode
16-bit bus mode
Notes: 1.
2.
Initial state in modes 1 and 3.
Initial state in modes 2 and 4.
*1
*2
240



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