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M28256 データシート(PDF) 6 Page - STMicroelectronics

部品番号 M28256
部品情報  256 Kbit 32Kb x8 Parallel EEPROM with Software Data Protection
PDF  21 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M28256 データシート(HTML) 6 Page - STMicroelectronics

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AI01698B
WRITE AAh in
Address 5555h
WRITE 55h in
Address 2AAAh
WRITE A0h in
Address 5555h
SDP is set
WRITE AAh in
Address 5555h
WRITE 55h in
Address 2AAAh
WRITE A0h in
Address 5555h
WRITE Data to
be Written in
any Address
SDP ENABLE ALGORITHM
Page
Write
Instruction
Page
Write
Instruction
WRITE
is enabled
SDP
Set
SDP
not Set
Write
in Memory
Write Data
+
SDP Set
after tWC
Figure 5. Software Data Protection Enable Algorithm and Memory Write
AI01699B
WRITE AAh in
Address 5555h
WRITE 55h in
Address 2AAAh
WRITE 80h in
Address 5555h
Unprotected State
after
tWC (Write Cycle time)
WRITE AAh in
Address 5555h
WRITE 55h in
Address 2AAAh
WRITE 20h in
Address 5555h
Page
Write
Instruction
Figure 6. Software Data Protection Disable Algorithm
6/21
M28256



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