3069RF-ZTAT Datasheet, PDF(285/1003 Page) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

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3069RF-ZTAT Datasheet, PDF (285/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

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8.4 Port 3

8.4.1 Overview

Port 3 is an 8-bit input/output port also used for data bus, 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 mode 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

Port 3 pins Modes 1 to 5

Mode 7

P37 /D15

P36 /D14

P35 /D13

P34 /D12

P33 /D11

P32 /D10

P31 /D9

P30 /D8

D15 (input/output)

D14 (input/output)

D13 (input/output)

D12 (input/output)

D11 (input/output)

D10 (input/output)

D9 (input/output)

D8 (input/output)

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 8.3 Port 3 Pin Configuration

8.4.2 Register Descriptions

Table 8.5 summarizes the registers of port 3.

Table 8.5 Port 3 Registers

Address*

Name

Abbreviation R/W

H'EE002

Port 3 data direction register

P3DDR

W

H'FFFD2

Port 3 data register

P3DR

R/W

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

Initial Value

H'00

H'00

Rev. 5.0, 09/04, page 263 of 978

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