X28HC256 Datasheet, PDF (6/15 Pages) Xicor Inc. – 5 Volt, Byte Alterable E2PROM

DATA POLLING I/O₇
Figure 2. DATA Polling Bus Sequence
Last
WE ^Write
X28HC256
CE
OE
V_IH
I/O₇
HIGH Z
V_OL
A₀–A₁₄
An
An
An
An
An
V_OH
X28HC256
Ready
An
An
Figure 3. DATA Polling Software Flow
Write Data
DATA Polling can effectively halve the time for writing
to the X28HC256. 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
X28HC256
Ready
6
FN8108.1
May 17, 2006