Port 3; Overview - Renesas F-ZTAT H8 Series Hardware Manual

Section 9 I/O Ports
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
9.4.2 Register Configuration
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.
Rev. 3.00 Mar 21, 2006 page 256 of 814
REJ09B0302-0300
Port 3 pins Modes 1 to 6
P3 /D D
7 15 15
P3 /D D
6 14 14
P3 /D D
5 13 13
P3 /D D
4 12 12
P3 /D D
3 11 11
P3 /D D
2 10 10
P3 /D D
1 9 9
P3 /D D
0 8 8
Figure 9.3 Port 3 Pin Configuration
Abbreviation
P3DDR
P3DR
Mode 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