SH7041A datasheet(693/923 Pages) RENESAS

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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:

PC15DR PC14DR PC13DR PC12DR PC11DR PC10DR PC9DR

PC8DR

Initial value:

R/W:

R/W

Bit:

PC7DR

PC6DR

PC5DR

PC4DR

PC3DR

PC2DR

PC1DR

PC0DR

Initial value:

R/W:

R/W

Table 19.10 Read/Write Operation of the Port C Data Register (PCDR)

PCIOR

Pin Status

Read

Write

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

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

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