X28C64 データシートの表示（PDF） - Xicor -> Intersil
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X28C64 Datasheet PDF : 25 Pages
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X28C64
Resetting Software Data Protection
Figure 8. Reset Software Data Protection Timing Sequence
VCC
DATA AA
ADDRESS 1555
CE
55
0AAA
80
1555
AA
1555
55
0AAA
20
1555
≥tWC
STANDARD
OPERATING
MODE
WE
Figure 9. Software Sequence to Deactivate
Software Data Protection
WRITE DATA AA
TO ADDRESS
1555
WRITE DATA 55
TO ADDRESS
0AAA
3853 FHD F18.1
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 80
TO ADDRESS
1555
WRITE DATA AA
TO ADDRESS
1555
WRITE DATA 55
TO ADDRESS
0AAA
WRITE DATA 20
TO ADDRESS
1555
3853 ILL F19.2
8
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