HD6417750RF240V Datasheet, PDF (188/606 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

Section 9 I/O Ports
9.7 Port D
Port D is an 8-bit I/O port that also has other functions. Port D has the following registers. For
details on register addresses and register states during each processing, refer to appendix A, On-
Chip I/O Register.
• Port D data direction register (PDDDR)
• Port D data register (PDDR)
• Port D register (PORTD)
• Port D pull-up MOS control register (PDPCR)
9.7.1 Port D Data Direction Register (PDDDR)
PDDDR is an 8-bit write-only register, the individual bits of which specify whether the pins of
port D are used for input or output.
PDDDR cannot be read; if it is, an undefined value will be read.
Bit Bit Name
7 PD7DDR
6 PD6DDR
5 PD5DDR
4 PD4DDR
3 PD3DDR
2 PD2DDR
1 PD1DDR
0 PD0DDR
Initial Value R/W
0
W
0
W
0
W
0
W
0
W
0
W
0
W
0
W
Description
When a pin is specified as a general purpose I/O
port, setting this bit to 1 makes the corresponding
port 1 pin an output pin. Clearing this bit to 0 makes
the pin an input pin.
Rev. 7.00 Sep. 11, 2009 Page 152 of 566
REJ09B0211-0700