HD6433935 Hitachi, HD6433935 Datasheet - Page 148

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

1. Port data register 1 (PDR1)
PDR1 is an 8-bit register that stores data for port 1 pins P1
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.
2. Port control register 1 (PCR1)
PCR1 is an 8-bit register for controlling whether each of the port 1 pins P1
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.
3. Port pull-up control register 1 (PUCR1)
PUCR1 controls whether the MOS pull-up of each of the port 1 pins P1
a PCR1 bit is cleared to 0, setting the corresponding PUCR1 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, PUCR1 is initialized to H'00.
136
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
PUCR1
7
PCR1
R/W
R/W
P1
to P1
W
3
0
3
0
3
0
3
3
0
3
. If port 1 is read while PCR1
PUCR1
PCR1
R/W
R/W
P1
W
2
0
2
0
2
0
7
2
to P1
2
7
2
to P1
PUCR1
0
PCR1
is on or off. When
R/W
R/W
P1
W
1
0
1
0
1
0
0
functions as an
1
1
1
PUCR1
PCR1
R/W
R/W
P1
W
0
0
0
0
0
0
0
0
0