X28HC64 查看數據表（PDF） - Intersil
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X28HC64 Datasheet PDF : 16 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 writ-
ing to the X28HC64. The timing diagram in Figure 2
illustrates the sequence of events on the bus. The
software 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
4
FN8109.0
June 1, 2005
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