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X28HC64KI-70 Datasheet(PDF) 5 Page - Xicor Inc.

Part # X28HC64KI-70
Description  5 Volt, Byte Alterable E2PROM
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Manufacturer  XICOR [Xicor Inc.]
Direct Link  http://www.xicor.com
Logo XICOR - Xicor Inc.

X28HC64KI-70 Datasheet(HTML) 5 Page - Xicor Inc.

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X28HC64
5
THE TOGGLE BIT I/O
6
Figure 4. Toggle Bit Bus Sequence
Figure 5. Toggle Bit Software Flow
The Toggle Bit can eliminate the software housekeeping
chore of saving and fetching the last address and data
written to a device in order to implement
DATA Polling.
This can be especially helpful in an array comprised of
multiple X28HC64 memories that is frequently updated.
Toggle Bit Polling can also provide a method for status
checking in multiprocessor applications. The timing
diagram in Figure 4 illustrates the sequence of events on
the bus. The software flow diagram in Figure 5 illustrates
a method for polling the Toggle Bit.
3857 FHD F15
LOAD ACCUM
FROM ADDR n
COMPARE
ACCUM WITH
ADDR n
READY
COMPARE
OK?
NO
YES
LAST WRITE
3857 FHD F14
CE
OE
WE
I/O6
X28HC64
READY
VOH
VOL
LAST
WRITE
HIGH Z
* Beginning and ending state of I/O6 will vary.
*
*


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