HD6432646 Hitachi, HD6432646 Datasheet - Page 276

• Manufacturer Part Number: HD6432646
• Description: (HD64F264x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

9.4
9.4.1
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), and external interrupt input pins (IRQ4, 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. 9-3.
9.4.2
Table 9-6 shows the configuration of port 3 registers.
Table 9-6
Name
Port 3 data direction register
Port 3 data register
Port 3 register
Port 3 open drain control register
Notes: * Lower 16 bits of the address.
242
Port 3
Overview
Register Configuration
Port 3 Register Configuration
Port 3
Figure 9-3 Port 3 Pin Functions
Abbreviation
P3DDR
P3DR
PORT3
P3ODR
Port 3 pins
P37
P36
P35
P34
P33
P32
P31
P30
(I/O)
(I/O)
(I/O) / SCK1 (I/O) / IRQ5 (input)
(I/O) / RxD1 (input)
(I/O) / TxD1 (output)
(I/O) / SCK0 (I/O) / IRQ4 (input)
(I/O) / RxD0 (input)
(I/O) / TxD0 (output)
R/W
W
R/W
R
R/W
Initial Value
H'00
H'00
Undefined
H'00
Address*
H'FE32
H'FF02
H'FFB2
H'FE46