HD64F3664FPV Datasheet, PDF (164/446 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 9 I/O Ports
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.
Initial
Bit
Bit Name Value R/W Description
7
PCR87
0
W
When each of the port 8 pins P87 to P80 functions as
6
PCR86
0
W
an general I/O port, setting a PCR8 bit to 1 makes the
corresponding pin an output port, while clearing the bit
5
PCR85
0
W
to 0 makes the pin an input port.
4
PCR84
0
W
3
PCR83
0
W
2
PCR82
0
W
1
PCR81
0
W
0
PCR80
0
W
9.5.2 Port Data Register 8 (PDR8)
PDR8 is a general I/O port data register of port 8.
Initial
Bit
Bit Name Value R/W Description
7
P87
0
R/W PDR8 stores output data for port 8 pins.
6
P86
5
P85
4
P84
3
P83
0
R/W PDR8 is read while PCR8 bits are set to 1, the value
0
R/W
stored in PDR8 is read. If PDR8 is read while PCR8
bits are cleared to 0, the pin states are read
0
R/W
regardless of the value stored in PDR8.
0
R/W
2
P82
0
R/W
1
P81
0
R/W
0
P80
0
R/W
Rev. 6.00 Mar. 24, 2006 Page 134 of 412
REJ09B0142-0600