7733 datasheet(765/940 Pages) RENESAS

765 / 940 page

LOW VOLTAGE VERSION

7735 Group User’s Manual

18-17

18.6 Applications

18.6.3 Ready generating circuit example

When validating “wait” only for a certain area (for example, ROM area) in Figure 18.6.3, use the ready

function.

Figure 18.6.5 shows a ready generating circuit example.

M37735MHLXXXHP

CS0

RDY

AC32

CS0

RSMP

RDE

CS0

RSMP

RDY

td(RDE-

)

td(RSMP-RDE)

tsu(RDY-

)

Wait generated by the ready function is

inserted only to an area where

accessed by signal CS 0.

Circuit conditions : f(X IN)

≤ 12 MHz, no wait,

Propagation delay

time of AC32

(max. : 28 ns)

V Condition to satisfy the relationship t

tc+td(RSMP-RDE)

≥ 108 ns

Accordingly, when f (XIN)

≤ 12 MHz, this

example satisfies the relationship t

: Wait generated by the ready function

, or

f(XIN)

f(XCIN)

su(RDY-

)

≥ 80 ns is

su(RDY-

)

≥ 80 ns.

Fig. 18.6.5 Ready generating circuit example

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