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M45PE40-VMP6 Datasheet(PDF) 12 Page - STMicroelectronics |
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M45PE40-VMP6 Datasheet(HTML) 12 Page - STMicroelectronics |
12 / 35 page M45PE40 12/35 Write Enable (WREN) The Write Enable (WREN) instruction (Figure 7.) sets the Write Enable Latch (WEL) bit. The Write Enable Latch (WEL) bit must be set pri- or to every Page Write (PW), Page Program (PP), Page Erase (PE), and Sector Erase (SE) instruc- tion. The Write Enable (WREN) instruction is entered by driving Chip Select (S) Low, sending the in- struction code, and then driving Chip Select (S) High. Figure 7. Write Enable (WREN) Instruction Sequence Write Disable (WRDI) The Write Disable (WRDI) instruction (Figure 8.) resets the Write Enable Latch (WEL) bit. The Write Disable (WRDI) instruction is entered by driving Chip Select (S) Low, sending the instruc- tion code, and then driving Chip Select (S) High. The Write Enable Latch (WEL) bit is reset under the following conditions: –Power-up – Write Disable (WRDI) instruction completion – Page Write (PW) instruction completion – Page Program (PP) instruction completion – Page Erase (PE) instruction completion – Sector Erase (SE) instruction completion Figure 8. Write Disable (WRDI) Instruction Sequence C D AI02281E S Q 2 1 34567 High Impedance 0 Instruction C D AI03750D S Q 2 1 34567 High Impedance 0 Instruction |
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