SH7052 datasheet(693/919 Pages) RENESAS

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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, although that value is written into PCDR it does

not affect the pin state. Table 19.6 summarizes port C data register read/write operations.

PCDR is initialized to H'0000 by a power-on reset (excluding a WDT power-on reset), and in

hardware standby mode. It is not initialized in software standby mode or sleep mode.

• Bits 15 to 5—Reserved: These bits always read 0. The write value should always be 0.

Table 19.6

Port C Data Register (PCDR) Read/Write Operations

Bits 4 to 0:

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

SH7052 Datasheet(PDF) 693 Page - Renesas Technology Corp