SH7018 datasheet(323/431 Pages) RENESAS

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15.4.2

Port C Data Register (PCDR)

The port C data register (PCDR) is a 16-bit readable/writable register that stores port C data. The

bits of this register correspond to the various pins.

When a pin functions as a general output, if a value is written to PCDR, that value is output

directly from the pin, and if PCDR is read, the register value is returned directly regardless of the

pin state.

When a pin functions as a general input, if PCDR is read the pin state, not the register value, is

returned directly. If a value is written to PCDR, that value is written to PCDR but it does not affect

the pin state. Table 15.6 summarizes the port C data register read/write operations.

PCDR is initialized by an external power-on reset. However, it is not initialized by a WDT reset,

in standby mode, or in 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 15.6

Port C Data Register (PCDR) Read/Write Operations

PCIOR

Pin Function

Read

Write

General input

Pin state

Value is written to PCDR, but does not affect pin

state

Other than general

input

Pin state

Value is written to PCDR, but does not affect pin

state

General output

PCDR value

Write value is output from pin

Other than general

output

PCDR value

Value is written to PCDR, but does not affect pin

state

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