HD6433640 HITACHI [Hitachi Semiconductor], HD6433640 Datasheet - Page 207

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

Port Data Register 8 (PDR8)
PDR8 is an 8-bit register that stores data for port 8 pins P8
bits are set to 1, the values stored in PDR8 are read, regardless of the actual pin states. If port 8 is
read while PCR8 bits are cleared to 0, the pin states are read.
Upon reset, PDR8 is initialized to H'00.
Port Control Register 8 (PCR8)
PCR8 is an 8-bit register for controlling whether each of the port 8 pins P8
input or output pin. Setting a PCR8 bit to 1 makes the corresponding pin an output pin, while
clearing the bit to 0 makes the pin an input pin.
Upon reset, PCR8 is initialized to H'00.
PCR8 is a write-only register, which is always read as all 1s.
Bit
Initial value
Read/Write
Bit
Initial value
Read/Write
PCR8
R/W
P8
W
7
0
7
0
7
7
PCR8
R/W
P8
W
6
0
6
0
6
6
PCR8
R/W
P8
W
5
0
5
0
5
5
PCR8
R/W
P8
W
4
0
4
0
4
4
7
PCR8
to P8
R/W
P8
W
3
0
3
0
3
0
3
. If port 8 is read while PCR8
PCR8
R/W
P8
W
2
0
2
0
2
7
2
to P8
PCR8
0
R/W
P8
W
functions as an
1
0
1
0
1
1
PCR8
R/W
P8
W
0
0
0
0
0
199
0