Port3; 3.1 Overview; 3.2 Register Configuration - Renesas H8S/2633 Series Hardware Manual

10B.3 Port 3
10B.3.1 Overview
Port 3 is an 8-bit I/O port. Port 3 is a multi-purpose port for SCI I/O pins (TxD0, RxD0, SCK0,
TxD1, RxD1, SCK1, TxD4, RxD4, and SCK4) and external interrupt input pins (IRQ4 and IRQ5).
All of the port 3 pin functions have the same operating mode. The configuration for each of the
port 3 pins is shown in figure 10B-2.
10B.3.2 Register Configuration
Table 10B-4 shows the configuration of port 3 registers.
Table 10B-4 Port 3 Register Configuration
Name
Port 3 data direction register
Port 3 data register
Port 3 register
Port 3 open drain control register
Note: * Lower 16 bits of the address.
Port 3 pins
P37 (I/O) /
P36 (I/O) /
P35 (I/O) /
SCK4 (I/O) / IRQ5 (input)
Port 3
P34 (I/O) /
P33 (I/O) /
P32 (I/O) /
P31 (I/O) /
P30 (I/O) /
Figure 10B-2 Port 3 Pin Functions
Abbreviation
P3DDR
P3DR

PORT3

P3ODR
TxD4 (output)
RxD4 (input)
SCK1 (I/O) /
RxD1 (input)
TxD1 (input)
SCK0 (I/O) / IRQ4 (input)
RxD0 (input)
TxD0 (output)
R/W Initial Value
W H'00
R/W H'00
R Undefined
R/W H'00
Address*
H'FE32
H'FF02
H'FFB2
H'FE46
457