Hitachi H8S/2678 Series Reference Manual page 278

Port C Data Register (PCDR)
Bit 7
PC7DR
Initial value 0
Read/Write R/W
PCDR is an 8-bit readable/writable register that stores output data for the port C pins (PC7 to
PC0).
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
PC7
Initial value —*
Read/Write R
Note: * Determined by the state of pins PC7 to PC0.
PORTC is an 8-bit read-only register that shows the pin states. PORTC cannot be written to;
writing of output data for the port C pins (PC7 to PC0) 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.
Port C MOS Pull-Up Control Register (PCPCR)
Bit 7
PC7PCR PC6PCR PC5PCR PC4PCR PC3PCR PC2PCR PC1PCR PC0PCR
Initial value 0
Read/Write R/W
PCPCR is an 8-bit readable/writable register that controls the MOS input pull-up function
incorporated into port C on a bit-by-bit basis.
6 5
PC6DR PC5DR
0 0
R/W R/W
6 5
PC6 PC5
—* —*
R R
6 5
0 0
R/W R/W
4 3
PC4DR PC3DR
0 0
R/W R/W
4 3
PC4 PC3
—* —*
R R
4 3
0 0
R/W R/W
2 1
PC2DR PC1DR
0 0
R/W R/W
2 1
PC2 PC1
—* —*
R R
2 1
0 0
R/W R/W
0
PC0DR
0
R/W
0
PC0
—*
R
0
0
R/W
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