M28256-25NS6T(1999) 查看數據表（PDF） - STMicroelectronics
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产品描述 (功能)
生产厂家
M28256-25NS6T
(Rev.:1999)
(Rev.:1999)
STMicroelectronics
M28256-25NS6T Datasheet PDF : 21 Pages
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M28256
Figure 5. Software Data Protection Enable Algorithm and Memory Write
SDP
Set
SDP
not Set
Page
Write
Instruction
WRITE AAh in
Address 5555h
WRITE 55h in
Address 2AAAh
WRITE A0h in
Address 5555h
Page
Write
Instruction
WRITE AAh in
Address 5555h
WRITE 55h in
Address 2AAAh
WRITE A0h in
Address 5555h
SDP is set
WRITE Data to
be Written in
any Address
SDP ENABLE ALGORITHM
Write
in Memory
Write Data
+
SDP Set
after tWC
AI01698B
WRITE
is enabled
Figure 6. Software Data Protection Disable Algorithm
Page
Write
Instruction
WRITE AAh in
Address 5555h
WRITE 55h in
Address 2AAAh
WRITE 80h in
Address 5555h
WRITE AAh in
Address 5555h
WRITE 55h in
Address 2AAAh
WRITE 20h in
Address 5555h
Unprotected State
after
tWC (Write Cycle time)
AI01699B
6/21
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