28C256 查看數據表（PDF） - Xicor -> Intersil
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28C256 Datasheet PDF : 24 Pages
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X28C256
RESETTING SOFTWARE DATA PROTECTION
Figure 8. Reset Software Data Protection Timing Sequence
VCC
DATA AA
ADDR. 5555
CE
55
2AAA
80
5555
AA
5555
55
2AAA
20
5555
≥tWC
STANDARD
OPERATING
MODE
WE
Figure 9. Software Sequence to
Deactivate Software Data Protection
WRITE DATA AA
TO ADDRESS
5555
WRITE DATA 55
TO ADDRESS
2AAA
3855 FHD F18
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 X28C256 will be in standard operating mode.
Note: Once initiated, the sequence of write operations
should not be interrupted.
WRITE DATA 80
TO ADDRESS
5555
WRITE DATA AA
TO ADDRESS
5555
WRITE DATA 55
TO ADDRESS
2AAA
WRITE DATA 20
TO ADDRESS
5555
3855 FHD F19
8
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