7733 datasheet(420/940 Pages) RENESAS

tên linh kiện	7733

Giải thích chi tiết về linh kiện	16-BIT SINGLE-CHIP MICROCOMPUTER

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APPLICATIONS

7733 Group User’s Manual

17–13

When using an external memory which outputs data within an interval of tpxz(E-DZ) after signal

E’s

falling edge

When there is a possibility that the tail of an address collides with the head of data because the

external memory outputs data within an interval of tpxz(E-DZ) after signal E’s falling edge, delay only

___

the E’s front falling edge. In this case, the falling edge of the read signal (OE) for the memory, which

is generated from signal E, is delayed. (Refer to Figure 17.1.8.)

17.1 Memory expansion

Fig. 17.1.8 Timing example when data output is delayed

External memory

output enable signal

(Read signal)

Address output

External memory

data output

tpxz(E-DZ)

Address

Data

ten(OE)

ta(OE)

Satisfy the following conditions:

• tpxz(E-DZ)

≤ ten(OE)+d

• When ten(OE)

≤ tpxz(E-DZ) (= 5 ns), make sure that signal E’s falling edge precedes

signal OE’s falling edge and an interval of “d” is secured.

Note:

(The others are specifications of

external memory.)

: Specifications of

7733 Group

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