H8SSLASH2218 datasheet(298/750 Pages) RENESAS

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Section 8 I/O Ports

Rev.6.00 Jun. 03, 2008 Page 250 of 698

REJ09B0074-0600

8.9

Port D (H8S/2218 Group Only)

The port D is an 8-bit I/O port also functioning as data bus (D15 to D8) I/O pins. The port D has

the following registers.

• Port D data direction register (PDDDR)

• Port D data register (PDDR)

• Port D register (PORTD)

• Port D pull-up MOS control register (PDPCR)

8.9.1

Port D Data Direction Register (PDDDR)

PDDDR specifies input or output for the pins of the port D.

Since PDDDR is a write-only register, the bit manipulation instructions must not be used to write

PDDDR. For details, see section 2.9.4, Accessing Registers Containing Write-Only Bits.

Bit

Bit Name Initial Value

R/W

Description

PD7DDR

PD6DDR

PD5DDR

PD4DDR

PD3DDR

PD2DDR

PD1DDR

PD0DDR

Modes 4 to 6:

Port D pins automatically function as data input/output

pins.

Mode 7:

Setting a PDDDR bit to 1 makes the corresponding port D

pin an output port, while clearing the bit to 0 makes the

pin an input port.

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