Renesas SH7041 Series, Hardware Manual, Page: 693 / 923

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19.4.2 Port C Data Register (PCDR)
PCDR is a 16-bit read/write register that stores data for port C. The bits PC15DR–PC0DR
correspond to the PC15/A15–PC0/A0 pins. When the pins are used as ordinary outputs, they will
output whatever value is written in the PCDR; when PCDR is read, the register value will be read
regardless of the pin status. When the pins are used as ordinary inputs, the pin status rather than
the register value is read directly when PCDR is read. When a value is written to PCDR, that value
can be written into PCDR, but it will not affect the pin status. Table 19.10 shows the read/write
operations of the port C data register.
PCDR is initialized by an external power-on reset. However, PCDR is not initialized for a manual
reset, reset by WDT, standby mode, or sleep mode.
Bit: 15 14 13 12 11 10 9 8
PC15DR PC14DR PC13DR PC12DR PC11DR PC10DR PC9DR PC8DR
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
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
Table 19.10 Read/Write Operation of the Port C Data Register (PCDR)
PCIOR Pin Status Read Write
0 Ordinary input Pin status Can write to PCDR, but it has no effect on pin status
Other function Pin status Can write to PCDR, but it has no effect on pin status
1 Ordinary output PCDR value Value written is output by pin
Other function PCDR value Can write to PCDR, but it has no effect on pin status