HD64F3687GHV Datasheet, PDF (193/566 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

9.7 Port 8
Port 8 is a general I/O port. Each pin of the port 8 is shown in figure 9.7.
Section 9 I/O Ports
P87
Port 8
P86
P85
Figure 9.7 Port 8 Pin Configuration
Port 8 has the following registers.
• Port control register 8 (PCR8)
• Port data register 8 (PDR8)
9.7.1 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
6
PCR86 0
5
PCR85 0
W
When each of the port 8 pins P87 to P85 functions as a
W
general I/O port, setting a PCR8 bit to 1 makes the
corresponding pin an output port, while clearing the bit to
W
0 makes the pin an input port.
4 to 0 


Reserved
9.7.2 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
6
P86
5
P85
4 to 0 
0
R/W PDR8 stores output data for port 8 pins.
0
R/W If 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 regardless of the
value stored in PDR8.
All 1

Reserved
These bits are always read as 1.
Rev. 3.00 Sep. 10, 2007 Page 159 of 528
REJ09B0216-0300