HD6433044 Datasheet, PDF(266/867 Page) Hitachi Semiconductor – Hitachi Single-Chip Microcomputer

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

HD6433044 Datasheet, PDF (266/867 Pages) Hitachi Semiconductor – Hitachi Single-Chip Microcomputer

◁

9.4 Port 3

9.4.1 Overview

Port 3 is an 8-bit input/output port with the pin configuration shown in figure 9-3. Port 3 is a data

bus in modes 1 to 6 (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 6

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 9-3 Port 3 Pin Configuration

9.4.2 Register Descriptions

Table 9-5 summarizes the registers of port 3.

Table 9-5 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

253

▷