X28HC64(2006) データシートの表示（PDF） - Intersil
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X28HC64 Datasheet PDF : 17 Pages
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DATA POLLING I/O7
Figure 2. DATA Polling Bus Sequence
Last
WE Write
X28HC64
CE
OE
VIH
I/O7
HIGH Z
VOL
A0–A12
An
An
An
An
An
VOH
X28HC64
Ready
An
An
Figure 3. DATA Polling Software Flow
Write Data
DATA Polling can effectively reduce the time for writing
to the X28HC64. The timing diagram in Figure 2 illus-
trates the sequence of events on the bus. The soft-
ware flow diagram in Figure 3 illustrates one method
of implementing the routine.
Writes
No
Complete?
Yes
Save Last Data
and Address
Read Last
Address
IO7
No
Compare?
Yes
Ready
6
FN8109.1
June 7, 2006
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