X28C512 查看數據表（PDF） - Xicor -> Intersil

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X28C512

5 Volt, Byte Alterable E

Xicor -> Intersil 

X28C512/X28C513

Resetting Software Data Protection

Figure 5a. Reset Software Data Protection Timing Sequence

VCC

DATA AA

ADDR 5555

CE

55

2AAA

80

5555

AA

5555

55

2AAA

20

5555

WE

≥tWC

STANDARD

OPERATING

MODE

NOTE: All other timings and control pins are per page write timing requirements.

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Figure 5b. Software Sequence to Deactivate

Software Data Protection

WRITE DATA AA

TO ADDRESS

5555

WRITE DATA 55

TO ADDRESS

2AAA

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 X28C512/513 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

3856 FHD F14

8

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