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Port Data Register 8 (PDR8)
Bit
P8
Initial value
Read/Write
R/W
PDR8 is an 8-bit register that stores data for port 8 pins P8
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
PCR8
Initial value
Read/Write
PCR8 is an 8-bit register for controlling whether each of the port 8 pins P8
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.
7
6
P8
P8
7
6
0
0
R/W
R/W
7
6
PCR8
PCR8
7
6
0
0
W
W
W
5
4
P8
P8
5
4
0
0
R/W
R/W
to P8
7
5
4
PCR8
PCR8
5
4
0
0
W
W
3
2
P8
P8
3
2
0
0
R/W
R/W
. If port 8 is read while PCR8
0
3
2
PCR8
PCR8
3
2
0
0
W
W
to P8
functions as an
7
0
1
0
P8
1
0
0
0
R/W
1
0
PCR8
1
0
0
0
W
147
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