HD6433640 HITACHI [Hitachi Semiconductor], HD6433640 Datasheet - Page 182

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

Port Data Register 1 (PDR1)
Note: * Bits 3 to 1 are reserved; they are always read as 0 and cannot be modified.
PDR1 is an 8-bit register that stores data for port 1 pins P1
while PCR1 bits are set to 1, the values stored in PDR1 are read, regardless of the actual pin states.
If port 1 is read while PCR1 bits are cleared to 0, the pin states are read.
Upon reset, PDR1 is initialized to H'00.
Port Control Register 1 (PCR1)
PCR1 is an 8-bit register for controlling whether each of the port 1 pins P1
functions as an input pin or output pin. Setting a PCR1 bit to 1 makes the corresponding pin an
output pin, while clearing the bit to 0 makes the pin an input pin. The settings in PCR1 and in
PDR1 are valid only when the corresponding pin is designated in PMR1 as a general I/O pin.
Upon reset, PCR1 is initialized to H'00.
PCR1 is a write-only register, which is always read as all 1s.
Port Pull-Up Control Register 1 (PUCR1)
Note: * Bits 3 to 1 are reserved; they are always read as 0 and cannot be modified.
174
Bit
Initial value
Read/Write
Bit
Initial value
Read/Write
Bit
Initial value
Read/Write
PUCR1
PCR1
R/W
R/W
P1
W
7
0
7
0
7
0
7
7
7
PUCR1
PCR1
R/W
R/W
P1
W
6
0
6
0
6
0
6
6
6
PUCR1
PCR1
R/W
R/W
P1
W
5
0
5
0
5
0
5
5
5
PUCR1
PCR1
R/W
R/W
P1
W
4
0
4
0
4
0
4
4
4
7
through P1
—
0*
—
—
—
—
0*
—
3
3
0
3
4
—
0*
—
—
—
—
0*
—
and P1
2
2
0
2
7
through P1
0
. If port 1 is read
—
0*
—
—
—
—
0*
—
1
1
0
1
4
and P1
PUCR1
PCR1
R/W
R/W
P1
W
0
0
0
0
0
0
0
0
0
0