H8SSLASH2214 datasheet(181/936 Pages) RENESAS

Il numero della parte	H8S/2214

Spiegazioni elettronici	16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series

PDF	936 Pages

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Produttore elettronici	RENESAS [Renesas Technology Corp]

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Section 6 Bus Controller

Rev.4.00 Sep. 18, 2008 Page 121 of 872

REJ09B0189-0400

6.1.3

Pin Configuration

Table 6.1 summarizes the pins of the bus controller.

Table 6.1

Bus Controller Pins

Name

Symbol

I/O

Function

Address strobe

Output

Strobe signal indicating that address output on address

bus is enabled.

Read

Output

Strobe signal indicating that external space is being

read.

High write

HWR

Output

Strobe signal indicating that external space is to be

written, and upper half (D15 to D8) of data bus is

enabled.

Low write

LWR

Output

Strobe signal indicating that external space is to be

written, and lower half (D7 to D0) of data bus is enabled.

Chip select 0 to 7

CS0 to

CS7

Output

Strobe signal indicating that areas 0 to 7 are selected.

Wait

WAIT

Input

Wait request signal when accessing external 3-state

access space.

Bus request

BREQ

Input

Request signal that releases bus to external device.

Bus request

acknowledge

BACK

Output

Acknowledge signal indicating that bus has been

released.

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