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7733 Scheda tecnica(PDF) 420 Page - Renesas Technology Corp

Il numero della parte 7733
Spiegazioni elettronici  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  940 Pages
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Produttore elettronici  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7733 Scheda tecnica(HTML) 420 Page - Renesas Technology Corp

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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)
E
OE
d
Address
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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