Datasheet

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