HD6433935 Hitachi, HD6433935 Datasheet - Page 175

• Manufacturer Part Number: HD6433935
• Description: 8-Bit MICROCONTROLLER
• Manufacturer: Hitachi

1. Port data register 6 (PDR6)
PDR6 is an 8-bit register that stores data for port 6 pins P6
If port 6 is read while PCR6 bits are set to 1, the values stored in PDR6 are read, regardless of the
actual pin states. If port 6 is read while PCR6 bits are cleared to 0, the pin states are read.
Upon reset, PDR6 is initialized to H'00.
2. Port control register 6 (PCR6)
PCR6 is an 8-bit register for controlling whether each of the port 6 pins P6
input pin or output pin.
Setting a PCR6 bit to 1 makes the corresponding pin (P6
bit to 0 makes the pin an input pin.
Upon reset, PCR6 is initialized to H'00.
PCR6 is a write-only register, which always reads all 1s.
3. Port pull-up control register 6 (PUCR6)
PUCR6 controls whether the MOS pull-up of each of the port 6 pins P6
a PCR6 bit is cleared to 0, setting the corresponding PUCR6 bit to 1 turns on the MOS pull-up for
the corresponding pin, while clearing the bit to 0 turns off the MOS pull-up.
Upon reset, PUCR6 is initialized to H'00.
Bit
Initial value
Read/Write
Bit
Initial value
Read/Write
Bit
Initial value
Read/Write
PUCR6
PCR6
R/W
R/W
P6
7
0
W
7
0
7
0
7
7
7
PUCR6
PCR6
R/W
R/W
P6
6
0
W
6
0
6
0
6
6
6
PUCR6
PCR6
R/W
R/W
P6
5
0
W
5
0
5
0
5
5
5
PUCR6
PCR6
R/W
R/W
P6
4
0
W
4
0
4
0
4
4
4
7
PUCR6
to P6
7
PCR6
R/W
R/W
P6
to P6
3
0
W
3
0
3
0
3
0
) an output pin, while clearing the
3
0
3
.
PUCR6
PCR6
R/W
R/W
P6
2
0
W
2
0
2
0
7
2
to P6
2
7
2
to P6
PUCR6
0
PCR6
is on or off. When
R/W
R/W
P6
1
0
W
0
1
0
1
0
1
functions as an
1
1
PUCR6
PCR6
R/W
R/W
P6
0
0
W
0
0
0
0
0
0
0
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