147
Port Data Register 8 (PDR8)
Bit
7
6
5
4
3
2
1
0
P8
7
P8
6
P8
5
P8
4
P8
3
P8
2
P8
1
P8
0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
PDR8 is an 8-bit register that stores data for port 8 pins P8
7
to P8
0
. If port 8 is read while PCR8
bits are set to 1, the values stored in PDR8 are directly read, regardless of the actual pin states. If
port 8 is read while PCR8 bits are cleared to 0, the pin states are read.
Upon reset, PDR8 is initialized to H'00.
Port Control Register 8 (PCR8)
Bit
7
6
5
4
3
2
1
0
PCR8
7
PCR8
6
PCR8
5
PCR8
4
PCR8
3
PCR8
2
PCR8
1
PCR8
0
Initial value
0
0
0
0
0
0
0
0
Read/Write
W
W
W
W
W
W
W
W
PCR8 is an 8-bit register for controlling whether each of the port 8 pins P8
7
to P8
0
functions as an
input or output pin. Setting a PCR8 bit to 1 makes the corresponding pin an output pin, while
clearing the bit to 0 makes the pin an input pin.
Upon reset, PCR8 is initialized to H'00.
PCR8 is a write-only register. All bits are read as 1.