HD6433832S Datasheet, PDF (161/560 Pages) Renesas Technology Corp – single-chip microcomputers

Port Data Register 3 (PDR3)
Bit
Initial value
Read/Write
7
P3₇
0
R/W
6
P3₆
0
R/W
5
P3₅
0
R/W
4
P3₄
0
R/W
3
P3₃
0
R/W
2
P3₂
0
R/W
1
P3₁
0
R/W
0
P3₀
0
R/W
PDR3 is an 8-bit register that stores data for port 3 pins P3₇ to P3₀. If port 3 is read while PCR3
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.
Port Control Register 3 (PCR3)
Bit
Initial value
Read/Write
7
PCR3₇
0
W
6
PCR3₆
0
W
5
PCR3₅
0
W
4
PCR3₄
0
W
3
PCR3₃
0
W
2
PCR3₂
0
W
1
PCR3₁
0
W
0
PCR3₀
0
W
PCR3 is an 8-bit register for controlling whether each of the port 3 pins P3₇ to P3₀ functions as an
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. All bits are read as 1.
Port Pull-Up Control Register 3 (PUCR3)
Bit
Initial value
Read/Write
7
6
5
4
3
2
1
0
PUCR3₇ PUCR3₆ PUCR3₅ PUCR3₄ PUCR3₃ PUCR3₂ PUCR3₁ PUCR3₀
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
PUCR3 bits control the on/off state of pin P3₇–P3₀ MOS pull-ups. When 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.
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