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M30LW128D Datasheet(PDF) 52 Page - STMicroelectronics |
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M30LW128D Datasheet(HTML) 52 Page - STMicroelectronics |
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52 / 57 page  M30LW128D 52/57 Figure 25. Protection Register Program Flowchart and Pseudo Code Note: 1. PR = Protection Register 2. The Read Status Register command must be issued to the same address as the Protection Register Program command. Write PR Add, PR Data(1) AI06159b YES NO b7 = 1 Start Write C0h Write FFh Read Status Register(2) PR Program Sucessful b4 = 1 VPEN Invalid Error Protection Register Program Error Protection Register Lock Error YES YES YES NO NO NO Protection Register Program Command – write C0h – write Protection Register Address, Protection Register Data do: – read status register while b7 = 1 Read Memory Array Command: – write FFh If b4 = 1 Protection Register Program Error b3 = 1 If b3 = 1 VPEN Invalid Error b1 = 1 If b1 = 1 Protection Register Lock Error |
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