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X28HC256FM-12 Datasheet(PDF) 5 Page - Xicor Inc.

Part # X28HC256FM-12
Description  5 Volt, Byte Alterable E2PROM
Download  24 Pages
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Manufacturer  XICOR [Xicor Inc.]
Direct Link  http://www.xicor.com
Logo XICOR - Xicor Inc.

X28HC256FM-12 Datasheet(HTML) 5 Page - Xicor Inc.

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X28HC256
5
LOAD ACCUM
FROM ADDR n
COMPARE
ACCUM WITH
ADDR n
X28HC256
READY
COMPARE
OK?
NO
YES
LAST WRITE
YES
THE TOGGLE BIT I/O6
Figure 4. Toggle Bit Bus Sequence
CE
OE
WE
I/O6
X28HC256
READY
VOH
VOL
LAST
WRITE
HIGH Z
* I/O6 beginning and ending state of I/O6 will vary.
*
*
3859 FHD F14
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 X28HC256 memories that is frequently up-
dated. 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.
3859 FHD F15


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