HD6433640 HITACHI [Hitachi Semiconductor], HD6433640 Datasheet - Page 204

• Manufacturer Part Number: HD6433640
• Description: H8/3644 Series Hardware Manual
• Manufacturer: HITACHI [Hitachi Semiconductor]

Port Data Register 7 (PDR7)
Note: * Bits 2 to 0 are reserved; they are always read as 0 and cannot be modified.
PDR7 is an 8-bit register that stores data for port 7 pins P7
bits are set to 1, the values stored in PDR7 are read, regardless of the actual pin states. If port 7 is
read while PCR7 bits are cleared to 0, the pin states are read.
Upon reset, PDR7 is initialized to H'00.
Port Control Register 7 (PCR7)
PCR7 is an 8-bit register for controlling whether each of the port 7 pins P7
input pin or output pin. Setting a PCR7 bit to 1 makes the corresponding pin an output pin, while
clearing the bit to 0 makes the pin an input pin.
Upon reset, PCR7 is initialized to H'00.
PCR7 is a write-only register, which always reads as all 1s.
196
Bit
Initial value
Read/Write
Bit
Initial value
Read/Write
PCR7
R/W
P7
W
7
0
7
0
7
7
PCR7
R/W
P7
W
6
0
6
0
6
6
PCR7
R/W
P7
W
5
0
5
0
5
5
PCR7
R/W
P7
W
4
0
4
0
4
4
7
PCR7
to P7
R/W
P7
W
3
0
3
0
3
3
3
. If port 7 is read while PCR7
—
0*
—
—
—
2
2
0
7
to P7
3
—
0*
—
—
—
functions as an
1
1
0
—
0*
—
—
—
0
0
0