H8SSLASH2218 datasheet(303/750 Pages) RENESAS

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Section 8 I/O Ports

Rev.6.00 Jun. 03, 2008 Page 255 of 698

REJ09B0074-0600

8.10

Port E

The port E is an 8-bit I/O port also functioning as data bus (D7 to D0) I/O pins. The port E has the

following registers.

• Port E data direction register (PEDDR)

• Port E data register (PEDR)

• Port E register (PORTE)

• Port E pull-up MOS control register (PEPCR)

8.10.1

Port E Data Direction Register (PEDDR)

PEDDR specifies input or output for the pins of the port E.

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

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

Bit

Bit Name Initial Value

R/W

Description

PE7DDR

PE6DDR

PE5DDR

PE4DDR

PE3DDR

PE2DDR

PE1DDR

PE0DDR

(H8S/2218 Group)

Modes 4 to 6:

When 8-bit bus mode is selected, port E functions as an

I/O port. Setting a PEDDR bit to 1 makes the

corresponding port E pin an output port, while clearing the

bit to 0 makes the pin an input port.

When 16-bit bus mode is selected, the input/output

direction settings in PEDDR are ignored, and port E pins

automatically function as data input/output pins.

For details on 8-bit/16-bit bus mode, refer to section 6,

Bus Controller.

Mode 7:

Setting a PEDDR bit to 1 makes the corresponding port E

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

pin an input port.

(H8S/2212 Group)

Setting a PEDDR bit to 1 makes the corresponding port E

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

pin an input port.

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