HD6473032F Datasheet, PDF(146/572 Page) Hitachi Semiconductor – Hitachi Microcomputer

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HD6473032F Datasheet, PDF (146/572 Pages) Hitachi Semiconductor – Hitachi Microcomputer

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7.4 Port 3

7.4.1 Overview

Port 3 is an 8-bit input/output port with the pin configuration shown in figure 7-7. Port 3 is a data

bus in mode 1 and a generic input/output port in modes 2 and 3.

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

Port 3 pins Mode 1

P37 /D7

P36 /D6

P35 /D5

P34 /D4

P33 /D3

P32 /D2

P31 /D1

P30 /D0

D7 (input/output)

D6 (input/output)

D5 (input/output)

D4 (input/output)

D3 (input/output)

D2 (input/output)

D1 (input/output)

D0 (input/output)

Modes 2 and 3

P37 (input/output)

P36 (input/output)

P35 (input/output)

P34 (input/output)

P33 (input/output)

P32 (input/output)

P31 (input/output)

P30 (input/output)

Figure 7-7 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

H'FFC4

Port 3 data direction register

H'FFC6

Port 3 data register

Note: * Lower 16 bits of the address.

Abbreviation R/W

P3DDR

W

P3DR

R/W

Initial Value

H'00

H'00

131

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