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X28C64DM データシート(PDF) 8 Page - Xicor Inc.

部品番号 X28C64DM
部品情報  5 Volt, Byte Alterable E2PROM
PDF  25 Pages
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メーカー  XICOR [Xicor Inc.]
ホームページ  http://www.xicor.com
Logo XICOR - Xicor Inc.

X28C64DM データシート(HTML) 8 Page - Xicor Inc.

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8
X28C64
Resetting Software Data Protection
Figure 8. Reset Software Data Protection Timing Sequence
3853 FHD F18.1
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 X28C64 will be in standard operating mode.
Note:
Once initiated, the sequence of write opera-
tions should not be interrupted.
WRITE DATA 55
TO ADDRESS
0AAA
3853 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
CE
WE
STANDARD
OPERATING
MODE
VCC
DATA
ADDRESS
AA
1555
55
0AAA
80
1555
≥t
WC
AA
1555
55
0AAA
20
1555



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