Port 3; Overview; Register Descriptions - Hitachi F-ZTAT H8/3039 Series Hardware Manual

7.4 Port 3

7.4.1 Overview

Port 3 is an 8-bit input/output port with the pin configuration shown in figure 7-9. Port 3 is a data
bus in modes 1, 3 and 5 (expanded modes) and a generic input/output port in mode 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

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.
Port 3 pins Modes 1, 3 and 5
P3 /D D
7 7 7
P3 /D D
6 6 6
P3 /D D
5 5 5
P3 /D D
4 4 4
P3 /D D
3 3 3
P3 /D D
2 2 2
P3 /D D
1 1 1
P3 /D D
0
0 0
Figure 7-9 Port 3 Pin Configuration
Abbreviation
P3DDR
P3DR
Modes 6 and 7
(input/output) P3 (input/output)
(input/output) P3 (input/output)
(input/output) P3 (input/output)
(input/output) P3 (input/output)
(input/output) P3 (input/output)
(input/output) P3 (input/output)
(input/output) P3 (input/output)
(input/output) P3 (input/output)
R/W
W
R/W
7
6
5
4
3
2
1
0
Initial Value
H'00
H'00
145