SH7052 datasheet(703/919 Pages) RENESAS

703 / 919 page

677

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

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

pin state.

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

returned directly. If a value is written to PGDR, although that value is written into PGDR it does

not affect the pin state. Table 19.14 summarizes port G data register read/write operations.

PGDR 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 4—Reserved: These bits always read 0. The write value should always be 0.

Table 19.14 Port G Data Register (PGDR) Read/Write Operations

Bits 3 to 0:

PGIOR

Pin Function

Read

Write

General input

Pin state

Value is written to PGDR, but does not affect pin

state

Other than

general input

Pin state

Value is written to PGDR, but does not affect pin

state

General output

PGDR value

Write value is output from pin

Other than

general output

PGDR value

Value is written to PGDR, but does not affect pin

state

SH7052 Datasheet(PDF) 703 Page - Renesas Technology Corp