HD6432646 Hitachi, HD6432646 Datasheet - Page 322
HD6432646
Manufacturer Part Number
HD6432646
Description
(HD64F264x Series) 16-Bit Microcomputer
Manufacturer
Hitachi
Datasheet
1.HD6432646.pdf
(1155 pages)
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Port H Data Direction Register (PHDDR)
PHDDR is an 8-bit write-only register, the individual bits of which specify input or output for the
pins of port H. PHDDR cannot be read. If it is, an undefined value will be read.
PHDDR is initialized to H'00 by a reset and in hardware standby mode. It retains its prior state in
software standby mode.
Port H Data Register (PHDR)
PHDR is an 8-bit readable/writeable register that stores output data for the port H pins (PH7 to
PH0).
PHDR is initialized to H'00 by a reset and in hardware standby mode. It retains its prior state in
software standby mode.
Port H Register (PORTH)
Note: * Determined by the state of PH7 to PH0
PORTH is an 8-bit read-only register that shows the pin states. It cannot be written to. Writing of
output data for the port H pins (PH7 to PH0) must always be performed on PHDR.
If a port H read is performed while PHDDR bits are set to 1, the PHDR values are read. If a port H
read is performed while PHDDR bits are cleared to 0, the pin states are read.
After a reset and in hardware standby mode, PORTH contents are determined by the pin states, as
PHDDR and PHDR are initialized. PORTH retains its prior state in software standby mode.
288
Bit
Initial value :
R/W
Bit
Initial value :
R/W
Bit
Initial value :
R/W
:
:
:
:
:
:
PH7DDR PH6DDR PH5DDR PH4DDR PH3DDR PH2DDR PH1DDR PH0DDR
PH7DR
R/W
PH7
—*
W
7
0
7
0
7
R
PH6DR
R/W
PH6
—*
W
6
0
6
0
6
R
PH5DR
R/W
PH5
—*
W
5
0
5
0
5
R
PH4DR
R/W
PH4
—*
W
4
0
4
0
4
R
PH3DR
R/W
PH3
—*
W
3
0
3
0
3
R
PH2DR
R/W
PH2
—*
W
2
0
2
0
2
R
PH1DR
R/W
PH1
—*
W
1
0
1
0
1
R
PH0DR
R/W
PH0
—*
W
0
0
0
0
0
R
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