Hitachi H8/3035 Series Hardware Manual page 145

Port 5 Data Direction Register (P5DDR): P5DDR is an 8-bit write-only register that can select
input or output for each pin in port 5.
7
Bit
—
Initial value 1
Read/Write —
Reserved bits
Modes 1 and 2: A pin in port 5 becomes an address output pin if the corresponding P5DDR bit
is set to 1, and a generic input pin if this bit is cleared to 0.
Mode 3: Port 5 functions as an input/output port. A pin in port 5 becomes an output pin if the
corresponding P5DDR bit is set to 1, and an input pin if this bit is cleared to 0.
P5DDR is a write-only register. Its value cannot be read. All bits return 1 when read.
P5DDR is initialized to H'F0 by a reset and in hardware standby mode. In software standby
mode it retains its previous setting. If a P5DDR bit is set to 1, the corresponding pin maintains
its output state in software standby mode.
Port 5 Data Register (P5DR): P5DR is an 8-bit readable/writable register that stores data for
pins P5 to P5 .
3 0
Bit 7
—
Initial value 1
Read/Write —
When a bit in P5DDR is set to 1, if port 5 is read the value of the corresponding P5DR bit is
returned directly, regardless of the actual state of the pin. When a bit in P5DDR is cleared to 0,
if port 5 is read the corresponding pin level is read.
Bits P5 to P5 are reserved. They cannot be modified and are always read as 1.
7 4
P5DR is initialized to H'F0 by a reset and in hardware standby mode. In software standby mode
it retains its previous setting.
6 5 4
— — —
1 1 1
— — —
6 5 4
— — —
1 1 1
— — —
Reserved bits
2 1
3
P5 DDR P5 DDR P5 DDR
3 2 1
0 0 0
W W W
Port 5 data direction 3 to 0
These bits select input or
output for port 5 pins
3 2
P5 P5
3 2
0 0
R/W R/W
Port 5 data 3 to 0
These bits store data
for port 5 pins
0
P5 DDR
0
0
W
1 0
P5 P5
1 0
0 0
R/W R/W
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