HD64F2149YV datasheet(178/1075 Pages) RENESAS

No. de pieza	HD64F2149YV

Descripción Electrónicos	Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series

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Fabricante Electrónico	RENESAS [Renesas Technology Corp]

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178 / 1075 page

Section 6 Bus Controller

Rev. 3.00 Jan 18, 2006 page 150 of 1044

REJ09B0280-0300

6.4.3

Valid Strobes

Table 6.5 shows the data buses used and valid strobes for the access spaces.

In a read, the

RD signal is valid without discrimination between the upper and lower halves of the

data bus.

In a write, the

HWR signal is valid for the upper half of the data bus, and the LWR signal for the

lower half.

Table 6.5

Data Buses Used and Valid Strobes

Area

Access

Size

Read/

Write

Address

Valid

Strobe

Upper Data Bus

(D15 to D8)

Lower Data Bus

(D7 to D0)

Byte

Read

—

Valid

Port, etc.

8-bit access

space

Write

—

HWR

Port, etc.

Byte

Read

Even

Valid

Invalid

16-bit access

space

Odd

Invalid

Valid

Write

Even

HWR

Valid

Undefined

Odd

LWR

Undefined

Valid

Word

Read

—

Valid

Write

—

HWR, LWR Valid

Valid

Notes:

Undefined: Undefined data is output.

Invalid:

Input state; input value is ignored.

Port, etc.:

Pins are used as port or on-chip supporting module input/output pins,

and not as data bus pins.

HD64F2149YV Datasheet(PDF) 178 Page - Renesas Technology Corp

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