Datasheet

Section 8 I/O Ports
Rev.7.00 Feb. 14, 2007 page 246 of 1108
REJ09B0089-0700
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.
P35
P34
P33
P32
P31
P30
(I/O)/
(I/O)/
(I/O)/
(I/O)/
(I/O)/
(I/O)/
SCK1
SCK0
RxD1
RxD0
TxD1
TxD0
(I/O)/
(I/O)/
(input)
(input)
(output)
(output)
Port 3 pins
Port 3
IRQ5
(input)
IRQ4 (input)
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 Initial Value
*
1
Address
*
2
Port 3 data direction register P3DDR W H'00 H'FEB2
Port 3 data register P3DR R/W H'00 H'FF62
Port 3 register PORT3 R Undefined H'FF52
Port 3 open drain control register P3ODR R/W H'00 H'FF76
Notes: 1. Value of bits 5 to 0.
2. Lower 16 bits of the address.