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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.
8.4.2
Register Configuration
Table 8-6 shows the port 3 register configuration.
Table 8-6
Port 3 Registers
Name
Port 3 data direction register
Port 3 data register
Port 3 register
Port 3 open drain control register
Notes: 1. Value of bits 5 to 0.
2. Lower 16 bits of the address.
Rev. 5.00, 12/03, page 242 of 1088
Port 3 pins
P35
(I/O)/
P34
(I/O)/
P33
(I/O)/
Port 3
P32
(I/O)/
P31
(I/O)/
P30
(I/O)/
Figure 8-3 Port 3 Pin Functions
Abbreviation
P3DDR
P3DR
PORT3
P3ODR
IRQ5 (input)
SCK1
(I/O)/
IRQ4 (input)
SCK0
(I/O)/
RxD1
(input)
RxD0
(input)
TxD1
(output)
TxD0
(output)
Initial Value *
R/W
W
H'00
R/W
H'00
R
Undefined
R/W
H'00
1
2
Address *
H'FEB2
H'FF62
H'FF52
H'FF76
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