SH7041A datasheet(691/923 Pages) RENESAS

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19.3.2

Port B Data Register (PBDR)

PBDR is a 16-bit read/write register that stores data for port B. The bits PB9DR–PB0DR

correspond to the PB9/

IRQ7/A21/ADTRG–PB0/A16 pins. When the pins are used as ordinary

outputs, they will output whatever value is written in the PBDR; when PBDR 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 PBDR is read. When a value is written to

PBDR, that value can be written into PBDR, but it will not affect the pin status. Table 19.7 shows

the read/write operations of the port B data register.

PBDR is initialized by an external power-on reset. However, PBDR is not initialized for a manual

reset, reset by WDT, standby mode, or sleep mode.

Bit:

—

PB9DR

PB8DR

Initial value:

R/W:

R/W

Bit:

PB7DR

PB6DR

PB5DR

PB4DR

PB3DR

PB2DR

PB1DR

PB0DR

Initial value:

R/W:

R/W

Table 19.7

Read/Write Operation of the Port B Data Register (PBDR)

PBIOR

Pin Status

Read

Write

Ordinary input

Pin status

Can write to PBDR, but it has no effect on pin status

Other function

Pin status

Can write to PBDR, but it has no effect on pin status

Ordinary output

PBDR value

Value written is output by pin

Other function

PBDR value

Can write to PBDR, but it has no effect on pin status

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