7733 datasheet(701/940 Pages) RENESAS

Il numero della parte	7733

Spiegazioni elettronici	16-BIT SINGLE-CHIP MICROCOMPUTER

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Produttore elettronici	RENESAS [Renesas Technology Corp]

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CONNECTING EXTERNAL DEVICES

7735 Group User’s Manual

12–25

12.4 Hold function

External address bus

Because the bus is not in use, the address which was output immediately before is

output again, instead of a new address.

HLDA

HOLD

BHE

ALE

External address bus/

External data bus

Sampling timing

Note: The same operation is performed independent of the software wait (no wait, wait 0, or wait 1).

This diagram shows the operation when no wait is selected.

CS0 to CS4

Clock

External data bus

Data length

External data bus width

Software wait

8, 16

No wait,

Not in use

q State when “L” level is input to pin HOLD

Wait 1, Wait 0

8, 16

<<When “L” level is input to pin HOLD while bus is not in use>>

Address B

1 !

Bus is in use.

Bus is not in use.

Address A

Data

Address A

Floating

Bus is in use.

Hold state

g RDE, WEL, WEH

Fig. 12.4.2 Timing when hold state is accepted and terminated (1)

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