HD6473032F Datasheet, PDF (166/572 Pages) Hitachi Semiconductor – Hitachi Microcomputer

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
6
5
4
3
2
1
0
—
—
— P9₄DDR — P9₂DDR — P9₀DDR
Initial value
1
1
0
0
0
0
0
0
Read/Write
—
—
W
W
W
W
W
W
Reserved bits
Port 9 data direction 4, 2, 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 data for pins
P9₄, P9₂, and P9₀.
Bit
7
—
Initial value
1
Read/Write
—
6
5
4
3
2
1
0
—
—
P9 ₄
—
P9 ₂
—
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 4, 2, 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 directly. When a bit in P9DDR is cleared to 0, if port 9 is read the corresponding pin level
is read.
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