HD6417618 datasheet(490/646 Pages) RENESAS

490 / 646 page

Section 17 I/O Ports

Rev. 6.00 Jun. 12, 2007 Page 458 of 610

REJ09B0131-0600

When the pin function is general output port, if the value is written to PADRH, the value is output

from the pin; if PADRH is read, the value written to the register is directly read regardless of the

pin state.

When the pin function is general input port, not the value of register but pin state is directly read if

PADRH is read. Data can be written to PADRH but no effect on the pin state. Table 17.1 shows

the reading/writing function of the port A data register H.

Bit

Bit Name

Initial

Value

R/W

Description

15 to 10



All 0

Reserved

These bits are always read as 0. The write value should

always be 0.

PA25DR

R/W

See table 17.1.

PA24DR

R/W

PA23DR

R/W

PA22DR

R/W

PA21DR

R/W

PA20DR

R/W

PA19DR

R/W

PA18DR

R/W

PA17DR

R/W

PA16DR

R/W

Table 17.1

Port A Data Register H (PADRH) Read/Write Operation

• Bits 9 to 0 in PADRH

Pin Function

PAIORH

Read

Write

General input

Pin state

Data can be written to PADRH but no effect on

the pin state.

General output

PADRH value

Written value is output from the pin.

Other functions

PADRH value

Data can be written to PADRH but no effect on

the pin state.

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