HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 286

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HD6433044

Manufacturer Part Number
HD6433044
Description
(HD64 Series) Hitachi Single-Chip Microcomputer
Manufacturer
Hitachi Semiconductor
Datasheet

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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.
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.
Port 9 Data Register (P9DR): P9DR is an 8-bit readable/writable register that stores output data
for pins P9
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.
P9DR is initialized to H'C0 by a reset and in hardware standby mode. In software standby mode it
retains its previous setting.
Bit
Initial value
Read/Write
Bit
Initial value
Read/Write
5
to P9
0
. When a bit in P9DDR is set to 1, if port 9 is read the value of the
Reserved bits
Reserved bits
7
1
7
1
6
1
6
1
P9 DDR
R/W
P9
5
W
5
0
5
0
5
P9 DDR
273
R/W
P9
4
W
4
0
4
0
4
Port 9 data direction 5 to 0
These bits select input or
output for port 9 pins
P9 DDR
Port 9 data 5 to 0
These bits store data
for port 9 pins
R/W
P9
3
W
3
0
3
0
3
P9 DDR
R/W
P9
2
W
2
0
2
0
2
P9 DDR
R/W
P9
1
W
1
0
1
0
1
P9 DDR
R/W
P9
0
W
0
0
0
0
0

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