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E, OE
A
/D
–A
/D
8
8
15
15
A
/D
16
0
R/W
CE
External ROM
data output
Fig. 17.1.26 Timing chart for ROM expansion example (maximum model at low-speed running)
12 (min.)
5 (max.)
A
20 (min.)
t
su
(P0A/P1A/P2A-P1D/P2D)
t
+AC573 (t
a
(AD)
AC04 (t
)
PHL
t
a
(CE)
7751 Group User's Manual
APPLICATIONS
17.1 Memory expansion
135 (min.)
= 135
/t
)
PHL
PLH
AC04 (t
t
a
(OE)
18 (min.)
A
18 (max.)
)
PLH
15 (max.)
( Kit guaranteed )
D
≥ 30
t
su
(P1D/P2D-E)
(Unit : ns)
17–31
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