AI01356B

WRITE AAh in

Address 1555h

WRITE 55h in

Address 0AAAh

WRITE A0h in

Address 1555h

SDP is set

WRITE AAh in

Address 1555h

WRITE 55h in

Address 0AAAh

WRITE A0h in

Address 1555h

Write Page

(1 up to 64 bytes)

WRITE IN MEMORY

WHEN SDP IS SET

SDP ENABLE ALGORITHM

Page

Write

Instruction

(Note 1)

Page

Write

Instruction

(Note 1)

WRITE

is enabled

Figure 5. Software Data Protection Enable Algorithm and Memory Write

AI01357

WRITE AAh in

Address 1555h

WRITE 55h in

Address 0AAAh

WRITE 80h in

Address 1555h

Unprotected State

WRITE AAh in

Address 1555h

WRITE 55h in

Address 0AAAh

WRITE 20h in

Address 1555h

Page

Write

Instruction

Figure 6. Software Data Protection Disable Algorithm

Note: 1. MSB Address bits (A6 to A12) differ during these specific Page Write operations.

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M28LV64