HD64F3039F18 Datasheet, PDF (172/710 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family / H8/300H Series

Section 7 I/O Ports
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
Port 3 pins Modes 1, 3 and 5 Modes 6 and 7
P3₇ /D₇
P3₆ /D₆
P3₅ /D₅
P3₄ /D₄
P3₃ /D₃
P3₂ /D₂
P3₁ /D₁
P3₀ /D₀
D₇ (input/output)
D₆ (input/output)
D₅ (input/output)
D₄ (input/output)
D₃ (input/output)
D₂ (input/output)
D₁ (input/output)
D₀ (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 7.9 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.
Abbreviation
P3DDR
P3DR
R/W
Initial Value
W
H'00
R/W
H'00
Rev.3.00 Mar. 26, 2007 Page 148 of 682
REJ09B0353-0300