Datasheet

Section 10 I/O Ports
Rev.7.00 Mar. 18, 2009 page 521 of 1136
REJ09B0109-0700
10.12 Port D
Port D is an 8-bit I/O port that also has other functions. The port D has the following registers.
• Port D data direction register (PDDDR)
• Port D data register (PDDR)
• Port D register (PORTD)
• Port D pull-up MOS control register (PDPCR)
10.12.1 Port D Data Direction Register (PDDDR)
The individual bits of PDDDR specify input or output for the pins of port D.
PDDDR cannot be read; if it is, an undefined value will be read.
Bit Bit Name Initial Value R/W Description
7 PD7DDR 0 W
6 PD6DDR 0 W
5 PD5DDR 0 W
4 PD4DDR 0 W
3 PD3DDR 0 W
2 PD2DDR 0 W
1 PD1DDR 0 W
• Modes 7 (when EXPE = 1), 1, 2, and 4
Port D is automatically designated for data
input/output.
• Mode 7 (when EXPE = 0)
Port D is an I/O port, and its pin functions can be
switched with PDDDR.
0 PD0DDR 0 W