Port 3; Overview; Register Descriptions - Hitachi H8/3032 Series Hardware Manual

Downloaded from Elcodis.com electronic components distributor

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 pins
P3 /D
P3 /D
P3 /D
P3 /D
Port 3
P3 /D
P3 /D
P3 /D
P3 /D
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.
Mode 1
D (input/output)
7 7 7
D (input/output)
6 6 6
D (input/output)
5 5 5
D (input/output)
4 4 4
D (input/output)
3 3 3
D (input/output)
2 2 2
D (input/output)
1 1 1
D (input/output)
0 0 0
Abbreviation
P3DDR
P3DR
131
Modes 2 and 3
P3 (input/output)
7
P3 (input/output)
6
P3 (input/output)
5
P3 (input/output)
4
P3 (input/output)
3
P3 (input/output)
2
P3 (input/output)
1
P3 (input/output)
0
R/W Initial Value
W H'00
R/W H'00