1. Port data register 2 (PDR2)
Bit
7
P27
0
6
P26
0
5
P25
0
4
P24
0
3
P23
0
2
P22
0
1
P21
0
0
P20
0
Initial value
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
PDR2 is an 8-bit register that stores data for port 2 pins P27 to P20. If port 2 is read while PCR2
bits are set to 1, the values stored in PDR2 are read, regardless of the actual pin states. If port 2 is
read while PCR2 bits are cleared to 0, the pin states are read.
Upon reset, PDR2 is initialized to H'00.
2. Port control register 2 (PCR2)
Bit
7
6
5
4
3
2
1
0
PCR27 PCR26 PCR25 PCR24 PCR23 PCR22 PCR21 PCR20
Initial value
Read/Write
0
0
0
0
0
0
0
0
W
W
W
W
W
W
W
W
PCR2 is an 8-bit register for controlling whether each of the port 2 pins P27 to P20 functions as an
input pin or output pin. Setting a PCR2 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 PCR2 and PDR2 are valid only
when the corresponding pin is designated in PMR1 as a general I/O pin.
Upon reset, PCR2 is initialized to H'00.
PCR2 is a write-only register, which is always read as all 1s.
3. Port mode register 2 (PMR2)
Bit
7
—
1
6
—
1
5
POF1
0
4
—
1
3
—
1
2
1
SI1
0
0
SCK1
0
SO1
0
Initial value
Read/Write
—
—
R/W
—
—
R/W
R/W
R/W
PMR2 is an 8-bit read/write register that controls the selection of pin functions for port 2 pins P20,
P21, and P23, and the PMOS on/off state for the P22/SO1 pin.
Upon reset, PMR2 is initialized to H'D8.
141
ETC [ ETC ]
