HD6433935 Hitachi, HD6433935 Datasheet - Page 161
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HD6433935
Manufacturer Part Number
HD6433935
Description
8-Bit MICROCONTROLLER
Manufacturer
Hitachi
Datasheet
1.HD6433935.pdf
(521 pages)
- Current page: 161 of 521
- Download datasheet (2Mb)
1. Port data register 3 (PDR3)
PDR3 is an 8-bit register that stores data for port 3 pins P3
bits are set to 1, the values stored in PDR3 are read, regardless of the actual pin states. If port 3 is
read while PCR3 bits are cleared to 0, the pin states are read.
Upon reset, PDR3 is initialized to H'00.
2. Port control register 3 (PCR3)
PCR3 is an 8-bit register for controlling whether each of the port 3 pins P3
input pin or output pin. Setting a PCR3 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 PCR3 and in PDR3 are valid only
when the corresponding pin is designated in PMR3 as a general I/O pin.
Upon reset, PCR3 is initialized to H'00.
PCR3 is a write-only register, which is always read as all 1s.
3. Port pull-up control register 3 (PUCR3)
PUCR3 controls whether the MOS pull-up of each of the port 3 pins P3
a PCR3 bit is cleared to 0, setting the corresponding PUCR3 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, PUCR3 is initialized to H'00.
Bit
Initial value
Read/Write
Bit
Initial value
Read/Write
Bit
Initial value
Read/Write
PUCR3
PCR3
R/W
R/W
P3
W
7
0
7
0
7
0
7
7
7
PUCR3
PCR3
R/W
R/W
P3
W
6
0
6
0
6
0
6
6
6
PUCR3
PCR3
R/W
R/W
P3
W
5
0
5
0
5
0
5
5
5
PUCR3
PCR3
R/W
R/W
P3
W
4
0
4
0
4
0
4
4
4
PUCR3
PCR3
7
R/W
R/W
P3
to P3
W
3
0
3
0
3
0
3
3
0
3
. If port 3 is read while PCR3
PUCR3
PCR3
R/W
R/W
P3
W
2
0
2
0
2
0
7
2
to P3
2
7
2
to P3
PUCR3
0
PCR3
is on or off. When
R/W
R/W
P3
W
1
0
1
0
0
1
0
1
functions as an
1
1
PUCR3
PCR3
R/W
R/W
P3
W
0
0
0
0
0
0
0
0
0
149
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