HD6432345 Datasheet, PDF (247/907 Pages) Hitachi Semiconductor – H8S/2345 F-ZTAT Hardware Manual

8.4 Port 3
8.4.1 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) and interrupt input pins (IRQ4, IRQ5). Port 3 pin functions are the same in all
operating modes. The interrupt input pins (IRQ4, IRQ5) are Schmitt-triggered inputs.
Figure 8.3 shows the port 3 pin configuration.
Port 3 pins
Port 3
P3₅ (I/O)/SCK1(I/O)/ IRQ5 (input)
P3₄ (I/O)/SCK0(I/O)/ IRQ4 (input)
P3₃ (I/O)/RxD1(input)
P3₂ (I/O)/RxD0(input)
P3₁ (I/O)/TxD1 (output)
P3₀ (I/O)/TxD0 (output)
Figure 8.3 Port 3 Pin Functions
8.4.2 Register Configuration
Table 8.6 shows the port 3 register configuration.
Table 8.6 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. Value of bits 5 to 0.
2. Lower 16 bits of the address.
Initial Value*¹
H'00
H'00
Undefined
H'00
Address*²
H'FEB2
H'FF62
H'FF52
H'FF76
230