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M95040 Datasheet(PDF) 13 Page - STMicroelectronics |
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M95040 Datasheet(HTML) 13 Page - STMicroelectronics |
13 / 37 page 13/37 M95040, M95020, M95010 Write Enable (WREN) The Write Enable Latch (WEL) bit must be set pri- or to each WRITE and WRSR instruction. The only way to do this is to send a Write Enable instruction to the device. As shown in Figure 8., to send this instruction to the device, Chip Select (S) is driven Low, and the bits of the instruction byte are shifted in, on Serial Data Input (D). The device then enters a wait state. It waits for a the device to be deselected, by Chip Select (S) being driven High. Figure 8. Write Enable (WREN) Sequence Write Disable (WRDI) One way of resetting the Write Enable Latch (WEL) bit is to send a Write Disable instruction to the device. As shown in Figure 9., to send this instruction to the device, Chip Select (S) is driven Low, and the bits of the instruction byte are shifted in, on Serial Data Input (D). The device then enters a wait state. It waits for a the device to be deselected, by Chip Select (S) be- ing driven High. The Write Enable Latch (WEL) bit, in fact, be- comes reset by any of the following events: –Power-up – WRDI instruction execution – WRSR instruction completion – WRITE instruction completion – Write Protect (W) line being held Low. Figure 9. Write Disable (WRDI) Sequence C D AI01441D S Q 2 1 34567 High Impedance 0 Instruction C D AI03790D S Q 2 1 34567 High Impedance 0 Instruction |
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