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X28HC64TI-90 Datasheet(PDF) 8 Page - Xicor Inc.

Part # X28HC64TI-90
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.

X28HC64TI-90 Datasheet(HTML) 8 Page - Xicor Inc.

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8
X28HC64
RESETTING SOFTWARE DATA PROTECTION
Figure 8. Reset Software Data Protection Timing Sequence
Figure 9. Software Sequence to
Deactivate Software Data Protection
In the event the user wants to deactivate the software
data protection feature for testing or reprogramming in
an E2PROM programmer, the following six step algo-
rithm will reset the internal protection circuit. After tWC,
the X28HC64 will be in standard operating mode.
Note:
Once initiated, the sequence of write operations
should not be interrupted.
3857 ILL F18.2
CE
WE
STANDARD
OPERATING
MODE
Vcc
DATA
ADDR
AA
1555
55
0AAA
80
1555
≥t
WC
AA
1555
55
0AAA
20
1555
WRITE DATA 55
TO ADDRESS
0AAA
3857 ILL F19.2
WRITE DATA 55
TO ADDRESS
0AAA
WRITE DATA 80
TO ADDRESS
1555
WRITE DATA AA
TO ADDRESS
1555
WRITE DATA 20
TO ADDRESS
1555
WRITE DATA AA
TO ADDRESS
1555


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