HD64F2357F20V Datasheet, PDF (319/1049 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-chip Microcomputer H8S Family / H8S/2300 Series

9.4 Port 3
9.4.1 Overview
Port 3 is a 6-bit I/O port. Port 3 pins also function as SCI I/O pins (TxD0, RxD0, SCK0, TxD1, RxD1, and SCK1). Port 3
pin functions are the same in all operating modes.
Figure 9-3 shows the port 3 pin configuration.
Port 3 pins
Port 3
P3₅ (I/O)/SCK1 (I/O)
P3₄ (I/O)/SCK0 (I/O)
P3₃ (I/O)/RxD1 (input)
P3₂ (I/O)/RxD0 (input)
P3₁ (I/O)/TxD1 (output)
P3₀ (I/O)/TxD0 (output)
Figure 9-3 Port 3 Pin Functions
9.4.2 Register Configuration
Table 9-6 shows the port 3 register configuration.
Table 9-6 Port 3 Registers
Name
Abbreviation R/W
Port 3 data direction register
P3DDR
W
Port 3 data register
P3DR
R/W
Port 3 register
PORT3
R
Port 3 open drain control register P3ODR
R/W
Notes: 1. Lower 16 bits of the address.
2. Value of bits 5 to 0.
Initial Value*²
H'00
H'00
Undefined
H'00
Address*¹
H'FEB2
H'FF62
H'FF52
H'FF76
Port 3 Data Direction Register (P3DDR)
Bit
:
7
6
5
4
3
2
1
0
—
— P35DDR P34DDR P33DDR P32DDR P31DDR P30DDR
Initial value : Undefined Undefined 0
0
0
0
0
0
R/W
:—
—
W
W
W
W
W
W
P3DDR is an 8-bit write-only register, the individual bits of which specify input or output for the pins of port 3. Bits 7 and
6 are reserved. P3DDR cannot be read; if it is, an undefined value will be read.
Setting a P3DDR bit to 1 makes the corresponding port 3 pin an output pin, while clearing the bit to 0 makes the pin an
input pin.
Rev.6.00 Oct.28.2004 page 289 of 1016
REJ09B0138-0600H