D12320VF25IV Datasheet, PDF (406/1304 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 9 I/O Ports
9.4 Port 3
9.4.1 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). Port 3 pin functions are the same in all operating modes.
Figure 9.3 shows the port 3 pin configuration.
Port 3 pins
Port 3
P3₅ (I/O) / SCK₁ (I/O)
P3₄ (I/O) / SCK₀ (I/O)
P3₃ (I/O) / RxD₁ (input)
P3₂ (I/O) / RxD₀ (input)
P3₁ (I/O) / TxD₁ (output)
P3₀ (I/O) / TxD₀ (output)
Figure 9.3 Port 3 Pin Functions
9.4.2 Register Configuration
Table 9.6 shows the port 3 register configuration.
Table 9.6 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. Lower 16 bits of the address.
2. Value of bits 5 to 0.
Initial Value^*2
H'00
H'00
Undefined
H'00
Address^*1
H'FEB2
H'FF62
H'FF52
H'FF76
Rev.6.00 Sep. 27, 2007 Page 374 of 1268
REJ09B0220-0600