Hitachi F-ZTAT H8/3039 Series Hardware Manual page 171

7.8.2 Register Descriptions
Table 7-11 summarizes the registers of port 8.
Table 7-11 Port 8 Registers
Address* Name
H'FFCD Port 8 data direction register
H'FFCF Port 8 data register
Note: * Lower 16 bits of the address.
Port 8 Data Direction Register (P8DDR): P8DDR is an 8-bit write-only register that can select
input or output for each pin in port 8.
7
Bit
—
1
Initial value
—
Read/Write
P8DDR is initialized to H'E0 by a reset and in hardware standby mode. In software standby mode
it retains its previous setting. If a P8DDR bit is set to 1, the corresponding pin maintains its output
state in software standby mode.
Port 8 Data Register (P8DR): P8DR is an 8-bit readable/writable register that stores data for pins
P8 to P8 .
1 0
Bit
Initial value
Read/Write
When a bit in P8DDR is set to 1, if port 8 is read the value of the corresponding P8DR bit is
returned directly. When a bit in P8DDR is cleared to 0, if port 8 is read the corresponding pin level
is read.
160
6 5
— —
1 1
— —
Reserved bits
7 6
— —
1 1
— —
Reserved bits
Abbreviation
P8DDR
P8DR
4 3
— —
0 0
W W
5 4
— —
—
1 0
— R/W R/W
R/W Initial Value
W H'E0
R/W H'E0
2 1
— P8 DDR
1
0 0
W W
Port 8 data direction 1 and 0
These bits select input or
output for port 8 pins
3 2
— P8
0 0
R/W R/W
Port 8 data 1 and 0
These bits store data
for port 8 pins
0
P8 DDR
0
0
W
1 0
P8
1 0
0 0
R/W