X28HC64 Datasheet, PDF (4/16 Pages) Xicor Inc. – 5 Volt, Byte Alterable E2PROM

DATA POLLING I/O₇
Figure 2. DATA Polling Bus Sequence
Last
WE ^Write
X28HC64
CE
OE
V_IH
I/O₇
HIGH Z
V_OL
A₀–A₁₂
An
An
An
An
An
V_OH
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