7733 datasheet(763/940 Pages) RENESAS

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LOW VOLTAGE VERSION

7735 Group User’s Manual

18-15

18.6.2 Memory expansion example

Figure 18.6.3 shows a memory expansion example and Figure 18.6.4 shows the corresponding timing

diagram.

In this example, an Atmel company’s EPROM (AT27LV256R) is used as the external ROM.

Fig. 18.6.3 Memory expansion example

XIN

XOUT

M37735MHLXXXHP

BYTE

Data bus

HC573

to D7

AT27LV256R-15DI

D0 to D7

A0 to A14

to A14

A0 to A16

DQ1 to DQ8

A0 to A16

D0 to D7

M5M51008AFP-15VLL

Address bus

A0/D0 to A7/D7

ALE

RDE

CNVSS

WEL

CS1

CS2

000016

008016

087F16

800016

FFFF16

4000016

5FFFF16

External ROM area

(AT27LV256R-15DI)

SFR area

Internal RAM area

External RAM area

(M5M51008AFP-15VLL)

Memory map

Not used

A8 to A16

10 MHz

Circuit conditions : Wait 1

g Make sure that the propagation delay time is 85 ns (max.) or less.

, or

f(XIN)

f(XCIN)

Supply voltage : Vcc = 3.0 to 5.5 V

(Can operate with no wait when f(XIN)

≤ 8.0 MHz.)

18.6 Applications

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