9.5.1
Port Control Register 8 (PCR8)
PCR8 selects inputs/outputs in bit units for pins to be used as general I/O ports of port 8.
Bit
Bit Name
7 to 5
4
PCR84
3
PCR83
2
PCR82
1
PCR81
0
PCR80
9.5.2
Port Data Register 8 (PDR8)
PDR8 is a general I/O port data register of port 8.
Bit
Bit Name
7 to 5
4
P84
3
P83
2
P82
1
P81
0
P80
Initial
Value
R/W
Description
Reserved
0
W
When each of the port 8 pins, P84 to P80, functions as an
general I/O port, setting a PCR8 bit to 1 makes the
0
W
corresponding pin an output port, while clearing the bit to
0
W
0 makes the pin an input port.
0
W
0
W
Initial
Value
R/W
Description
All 0
Reserved
0
R/W
These bits store output data for port 8 pins.
0
R/W
If PDR8 is read while PCR8 bits are set to 1, the value
stored in PDR8 is read. If PDR8 is read while PCR8 bits
0
R/W
are cleared to 0, the pin states are read regardless of the
0
R/W
value stored in PDR8.
0
R/W
Section 9 I/O Ports
Rev. 3.00 Sep. 14, 2006 Page 131 of 408
REJ09B0105-0300