hd66100 Renesas Electronics Corporation., hd66100 Datasheet - Page 157

• Manufacturer Part Number: hd66100
• Description: H8/3867 Series
• Manufacturer: Renesas Electronics Corporation.

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.
142
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
3
0
. 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
PCR3
0
R/W
R/W
P3
is on or off. When
W
1
0
1
0
1
0
0
1
functions as an
1
1
PUCR3
PCR3
R/W
R/W
P3
W
0
0
0
0
0
0
0
0
0