HD64F3039F18 Datasheet, PDF (193/710 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family / H8/300H Series

Section 7 I/O Ports
Port 9 Data Direction Register (P9DDR)
P9DDR is an 8-bit write-only register that can select input or output for each pin in port 9.
Bit
7
—
Initial value
1
Read/Write
—
6
5
4
3
2
1
0
— P9₅DDR P9₄DDR P9₃DDR P9₂DDR P9₁DDR P9₀DDR
1
0
0
0
0
0
0
—
W
W
W
W
W
W
Reserved bits
Port 9 data direction 5 to 0
These bits select input or
output for port 9 pins
A pin in port 9 becomes an output pin if the corresponding P9DDR bit is set to 1, and an input pin
if this bit is cleared to 0.
P9DDR is a write-only register. Its value cannot be read. All bits return 1 when read.
P9DDR is initialized to H'C0 by a reset and in hardware standby mode. In software standby mode
it retains its previous setting. If a P9DDR bit is set to 1, the corresponding pin maintains its output
state in software standby mode.
Port 9 Data Register (P9DR)
P9DR is an 8-bit readable/writable register that stores output data for pins P9₅ to P9₀.
Bit
7
—
Initial value
1
Read/Write
—
6
5
4
3
2
1
0
—
P9 ₅
P9 ₄
P9 ₃
P9 ₂
P9 ₁
P9 ₀
1
0
0
0
0
0
0
—
R/W
R/W
R/W
R/W
R/W R/W
Reserved bits
Port 9 data 5 to 0
These bits store data
for port 9 pins
When a bit in P9DDR is set to 1, if port 9 is read the value of the corresponding P9DR bit is
returned. When a bit in P9DDR is cleared to 0, if port 9 is read the corresponding pin level is read.
Bits 7 and 6 are reserved. They cannot be modified and are always read as 1.
Rev.3.00 Mar. 26, 2007 Page 169 of 682
REJ09B0353-0300