Datasheet

Section 9 I/O Ports
Rev.6.00 Sep. 27, 2007 Page 412 of 1268
REJ09B0220-0600
Port C Data Register (PCDR)
Bit : 7 6 5 4 3 2 1 0
PC7DR PC6DR PC5DR PC4DR PC3DR PC2DR PC1DR PC0DR
Initial value : 0 0 0 0 0 0 0 0
R/W : R/W R/W R/W R/W R/W R/W R/W R/W
PCDR is an 8-bit readable/writable register that stores output data for the port C pins (PC
7
to PC
0
).
PCDR is initialized to H'00 by a reset, and in hardware standby mode. It retains its prior state in
software standby mode.
Port C Register (PORTC)
Bit : 7 6 5 4 3 2 1 0
PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0
Initial value : —
*
—
*
—
*
—
*
—
*
—
*
—
*
—
*
R/W : R R R R R R R R
Note: * Determined by state of pins PC
7
to PC
0
.
PORTC is an 8-bit read-only register that shows the pin states. It cannot be written to. Writing of
output data for the port C pins (PC
7
to PC
0
) must always be performed on PCDR.
If a port C read is performed while PCDDR bits are set to 1, the PCDR values are read. If a port C
read is performed while PCDDR bits are cleared to 0, the pin states are read.
After a reset and in hardware standby mode, PORTC contents are determined by the pin states, as
PCDDR and PCDR are initialized. PORTC retains its prior state in software standby mode.