266
Port D Data Register (PDDR)
Bit
7
6
5
4
3
2
1
0
PD7DR
PD6DR
PD5DR
PD4DR
PD3DR
PD2DR
PD1DR
PD0DR
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
PDDR is an 8-bit readable/writable register that stores output data for the port D pins (PD7 to
PD0).
PDDR is initialized to H'00 by a reset and in hardware standby mode. It retains its prior state in
software standby mode.
Port D Register (PORTD)
Bit
7
6
5
4
3
2
1
0
PD7
PD6
PD5
PD4
PD3
PD2
PD1
PD0
Initial value
—
*
—
*
—
*
—
*
—
*
—
*
—
*
—
*
Read/Write
R
R
R
R
R
R
R
R
Note:
*
Determined by the state of pins PD7 to PD0.
PORTD is an 8-bit read-only register that shows the pin states. PORTD cannot be written to;
writing of output data for the port D pins (PD7 to PD0) must always be performed on PDDR.
If a port D read is performed while PDDDR bits are set to 1, the PDDR values are read. If a port D
read is performed while PDDDR bits are cleared to 0, the pin states are read.
After a reset and in hardware standby mode, PORTD contents are determined by the pin states, as
PDDDR and PDDR are initialized. PORTD retains its prior state in software standby mode.
Port D MOS Pull-Up Control Register (PDPCR)
Bit
7
6
5
4
3
2
1
0
PD7PCR PD6PCR PD5PCR PD4PCR PD3PCR PD2PCR PD1PCR PD0PCR
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
PDPCR is an 8-bit readable/writable register that controls the MOS input pull-up function
incorporated into port D on a bit-by-bit basis.
Содержание H8S/2670
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