H8SLASH3028F datasheet(287/923 Pages) RENESAS

287 / 923 page

Rev. 2.00, 09/03, page 257 of 890

8.4

Port 3

8.4.1

Overview

Port 3 is an 8-bit input/output port with the pin configuration shown in figure 8.3. Port 3 is a data

bus in modes 1 to 5 (expanded modes) and a generic input/output port in modes 6 and 7 (single-

chip mode).

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

P3 /D

P3 (input/output)

(input/output)

Port 3 pins

Modes 6 and 7

Modes 1 to 5

Figure 8.3 Port 3 Pin Configuration

8.4.2

Table 8.5 summarizes the registers of port 3.

Table 8.5

Port 3 Registers

Address*

Name

Abbreviation

R/W

Initial Value

H'EE002

Port 3 data direction register

P3DDR

H'00

H'FFFD2

Port 3 data register

P3DR

R/W

H'00

Note: * Lower 20 bits of the address in advanced mode.

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