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Section 8 I/O Ports
8.1.12
Port C
Port C is an 8-bit I/O port. Port C pins can also function as the bus control output, and IIC_2,
IIC_3, and IIC_4 input/output pins. The output format of ports C0 to C5 is NMOS push-pull
output. Port C has the following registers.
• Port C data direction register (PCDDR)
• Port C output data register (PCODR)
• Port C input data register (PCPIN)
(1)
Port C Data Direction Register (PCDDR)
The individual bits of PCDDR specify input or output for the port C pins.
Bit
Bit Name
7
PC7DDR
6
PC6DDR
5
PC5DDR
4
PC4DDR
3
PC3DDR
2
PC2DDR
1
PC1DDR
0
PC0DDR
Rev. 1.00 Mar. 12, 2008 Page 252 of 1178
REJ09B0403-0100
Initial Value
R/W
0
W
0
W
0
W
0
W
0
W
0
W
0
W
0
W
Description
When set to 1, the corresponding pins function as
output port pins; when cleared to 0, function as input
port pins.
Since this register is allocated to the same address as
PCPIN, states of the port C pins are returned when
this register is read.
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