HD64F3687GHV Datasheet, PDF (199/566 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 9 I/O Ports
9.9 Port C
Port C is a general I/O port also functioning as an external oscillation pin and clock output pin.
Each pin of the port C is shown in figure 9.9. The register setting of CKCSR has priority for
functions of the pins for both uses.
Port C
PC1/OSC2/CLKOUT
PC0/OSC1
Figure 9.9 Port C Pin Configuration
Port C has the following registers.
• Port control register C (PCRC)
• Port data register C (PDRC)
9.9.1 Port Control Register C (PCRC)
PCRC selects inputs/outputs in bit units for pins to be used as general I/O ports of port C.
Initial
Bit
Bit Name Value R/W Description
7 to 2 


Reserved
1
PCRC1 0
0
PCRC0 0
W
When each of the port C pins, PC1 and PC0, functions as
W
an general I/O port, setting a PCRC bit to 1 makes the
corresponding pin an output port, while clearing the bit to
0 makes the pin an input port.
Rev. 3.00 Sep. 10, 2007 Page 165 of 528
REJ09B0216-0300