XM28C020 データシートの表示（PDF） - Xicor -> Intersil

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XM28C020

5 Volt, Byte Alterable E2PROM

Xicor -> Intersil 

XM28C020

SOFTWARE DATA PROTECTION

Figure 6. Timing Sequence—Byte or Page Write

VCC

0V

DATA

ADDR.

A0–A15*

CE

AA

5555

55

2AAA

WE

A0

5555

≤tBLC MAX

*A16 & A17 select one of four devices on the module.

tWC

WRITES

OK

BYTE

OR

PAGE

(VCC)

WRITE

PROTECTED

3872 FHD F14

Figure 7. Write Sequence for

Software Data Protection

WRITE DATA AA

TO ADDRESS

5555

WRITE DATA 55

TO ADDRESS

2AAA

Regardless of whether the device has previously been

protected or not, once the software data protected

algorithm is used and data has been written, the device

will automatically disable further writes unless another

command is issued to cancel it. If no further commands

are issued the device will be write protected during

power-down and after any subsequent power-up.

WRITE DATA A0

TO ADDRESS

5555

WRITE DATA XX

TO ANY

ADDRESS

BYTE/PAGE

LOAD ENABLED

WRITE LAST

BYTE TO

LAST ADDRESS

AFTER tWC

RE-ENTERS DATA

PROTECTED STATE

3872 FHD F15

7

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