SH7041A datasheet(688/923 Pages) RENESAS

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19.2.1

Table 19.3 summarizes the port A register.

Table 19.3

Port A Register

Name

Abbreviation

R/W

Initial Value

Address

Access Size

Port A data register H PADRH

R/W

H'0000

H'FFFF8380

H'FFFF8381

8, 16, 32

Port A data register L PADRL

R/W

H'0000

H'FFFF8382

H'FFFF8383

8, 16, 32

19.2.2

Port A Data Register H (PADRH)

PADRH is a 16-bit read/write register that stores data for port A. The bits PA23DR–PA16DR

correspond to the PA23/

WRHH–PA16/AH pins. When the pins are used as ordinary outputs, they

will output whatever value is written in the PADRH; when PADRH is read, the register value will

be output 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 PADRH is read. When a value is written to

PADRH, that value can be written into PADRH, but it will not affect the pin status. Table 19.4

shows the read/write operations of the port A data register.

PADRH is initialized by an external power-on reset. However, PADRH is not initialized for

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

These register settings function only for the 144-pin version. There are no pins corresponding to

this register in the 112-pin version. However, read/writes are possible.

Bit:

——

———

—

Initial value:

R/W:

Bit:

PA23DR PA22DR PA21DR PA20DR PA19DR PA18DR PA17DR PA16DR

Initial value:

R/W:

R/W

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