D12320VF25IV Datasheet, PDF (407/1304 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 9 I/O Ports
Port 3 Data Direction Register (P3DDR)
Bit
:
7
6
5
4
3
2
1
0
—
— P35DDR P34DDR P33DDR P32DDR P31DDR P30DDR
Initial value : Undefined Undefined 0
0
0
0
0
0
R/W
:—
—
W
W
W
W
W
W
P3DDR is an 8-bit write-only register, the individual bits of which specify input or output for the
pins of port 3. Bits 7 and 6 are reserved. P3DDR cannot be read; if it is, an undefined value will be
read.
Setting a P3DDR bit to 1 makes the corresponding port 3 pin an output pin, while clearing the bit
to 0 makes the pin an input pin.
P3DDR is initialized to H'00 (bits 5 to 0) by a reset, and in hardware standby mode. It retains its
prior state in software standby mode. As the SCI is initialized, the pin states are determined by the
P3DDR and P3DR specifications.
Port 3 Data Register (P3DR)
Bit
:
7
6
5
—
— P35DR
Initial value : Undefined Undefined 0
R/W
:—
—
R/W
4
P34DR
0
R/W
3
P33DR
0
R/W
2
P32DR
0
R/W
1
P31DR
0
R/W
0
P30DR
0
R/W
P3DR is an 8-bit readable/writable register that stores output data for the port 3 pins (P3₅ to P3₀).
Bits 7 and 6 are reserved; they return an undefined value if read, and cannot be modified.
P3DR is initialized to H'00 (bits 5 to 0) by a reset, and in hardware standby mode. It retains its
prior state in software standby mode.
Rev.6.00 Sep. 27, 2007 Page 375 of 1268
REJ09B0220-0600