HD64F3028F25 Datasheet, PDF (289/925 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

8.4 Port 3
8.4.1 Overview
Port 3 is an 8-bit input/output port with the pin configuration shown in figure 8.3. Port 3 is a data
bus in modes 1 to 5 (expanded modes) and a generic input/output port in modes 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 pins Modes 1 to 5
Modes 6 and 7
Port 3
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 8.3 Port 3 Pin Configuration
8.4.2 Register Descriptions
Table 8.5 summarizes the registers of port 3.
Table 8.5 Port 3 Registers
Address^*
Name
Abbreviation
R/W
H'EE002
Port 3 data direction register
P3DDR
W
H'FFFD2
Port 3 data register
P3DR
R/W
Note: * Lower 20 bits of the address in advanced mode.
Initial Value
H'00
H'00
Rev. 2.00, 09/03, page 257 of 890