HD6417750RF240V Datasheet, PDF (166/606 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

Section 9 I/O Ports
9.1 Port 1
Port 1 is an 8-bit I/O port and has the following registers. For details on register addresses and
register states during each process, refer to appendix A, On-Chip I/O Register.
• Port 1 data direction register (P1DDR)
• Port 1 data register (P1DR)
• Port 1 register (PORT1)
9.1.1 Port 1 Data Direction Register (P1DDR)
P1DDR is an 8-bit write-only register, the individual bits of which specify input or output for the
pins of port 1.
P1DDR cannot be read; if it is, an undefined value will be read.
Bit Bit Name
7 P17DDR
6 P16DDR
5 P15DDR
4 P14DDR
3 P13DDR
2 P12DDR
1 P11DDR
0 P10DDR
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 130 of 566
REJ09B0211-0700