HD6473032F16 Datasheet, PDF (308/847 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Section 9 I/O Ports
9.10.2 Register Configuration
Table 9.16 summarizes the registers of port 9.
Table 9.16 Port 9 Registers
Address^* Name
H'FFD0
Port 9 data direction register
H'FFD2
Port 9 data register
Note: * Lower 16 bits of the address.
Abbreviation R/W
P9DDR
W
P9DR
R/W
Initial Value
H'C0
H'C0
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 port if the corresponding P9DDR bit is set to 1, and an input
port 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.
Rev. 3.00 Mar 21, 2006 page 278 of 814
REJ09B0302-0300