7733 datasheet(504/940 Pages) RENESAS

504 / 940 page

7733 Group User’s Manual

18–38

LOW VOLTAGE VERSION

18.6.4 Memory expansion example on maximum model

Figure 18.6.7 shows a memory expansion example on the maximum model. Figure 18.6.8 shows the

corresponding timing diagram. In this example, Atmel company’s EPROMs (AT27LV256R) are used as the

external ROMs.

In Figure 18.6.7, the circuit condition is “No wait.”

Fig. 18.6.7 Memory expansion example on maximum model

R/W

BHE

AC04

8 MHz

XIN

XOUT

M37733S4LHP

BYTE

A17

A8 to A16

Even data bus

Odd data bus

AC573

AC32

D0 to D7

D8 to D15

Address bus

A1 to A15

D0 to D7

A0 to A14

A1 to A15

A0 to A14

D0 to D7

AT27LV256R-15DI

AC32

A16/D0

to A17/D1

A1 to A16

D0 to D7

M5M51008AFP-10VLL

A0 to A15

DQ1 to DQ8

A1 to A16

D8 to D15

A0 to A15

DQ1 to DQ8

AC32

Circuit conditions : No wait

03FFFF16

External ROM area

(AT27LV256R! 2)

SFR area

Internal RAM area

Memory map

00000016

00008016

00088016

External RAM area

(M5M51008AFP! 2)

00FFFF16

02000016

Not used

AC04

A1 to A7

A8/D8

to A15/D15

ALE

D2 to D7

A16

V1 Make sure that the propagation delay time is 47 ns or less.

V2 Make sure that the propagation delay time is 50 ns or less.

V3 Make sure that the propagation delay time is 62 ns or less.

A16

Vcc = 3.3 ± 0.3 V

V 3

, or

f(XIN)

f(XCIN)

18.6 Applications

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