M28LV64 データシートの表示（PDF） - STMicroelectronics
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M28LV64 Datasheet PDF : 18 Pages
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M28LV64
Figure 5. Software Data Protection Enable Algorithm and Memory Write
Page
Write
Instruction
(Note 1)
WRITE AAh in
Address 1555h
WRITE 55h in
Address 0AAAh
WRITE A0h in
Address 1555h
SDP is set
Page
Write
Instruction
(Note 1)
WRITE AAh in
Address 1555h
WRITE 55h in
Address 0AAAh
WRITE A0h in
Address 1555h
Write Page
(1 up to 64 bytes)
WRITE
is enabled
SDP ENABLE ALGORITHM
WRITE IN MEMORY
WHEN SDP IS SET
AI01356B
Note: 1. MSB Address bits (A6 to A12) differ during these specific Page Write operations.
Figure 6. Software Data Protection Disable Algorithm
Page
Write
Instruction
WRITE AAh in
Address 1555h
WRITE 55h in
Address 0AAAh
WRITE 80h in
Address 1555h
WRITE AAh in
Address 1555h
WRITE 55h in
Address 0AAAh
WRITE 20h in
Address 1555h
Unprotected State
AI01357
6/18
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