7733 datasheet(739/940 Pages) RENESAS

tên linh kiện	7733

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

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TIONS

7735 Group User’s Manual

17–13

17.1 Memory expansion

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

____

RDE’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(RDE-DZ) after signal RDE’s falling edge, delay

____

only the signal RDE’s front falling edge and realize the relationship of tpxz(RDE-DZ)-d < ten(OE). In this

___

____

case, the falling edge of the read signal (OE) for the memory, which is generated from signal RDE,

is delayed. (Refer to Figure 17.1.7.)

Fig. 17.1.7 Timing example when data output is delayed

External memory

output enable signal

(Read signal)

Address output

External memory

data output

tpxz(RDE-DZ)

RDE

Address

Data

ten(OE)

ta(OE)

When ten(OE)

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

edge precedes signal OE’s falling edge (Refer to “d”) and the relationship

of tpxz(RED-DZ)-d

≤ ten(OE) is realized.

Note:

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