Rev. 5.00, 12/03, page 242 of 1088
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.
Содержание H8S/2318 series
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