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M25PE20 Datasheet(PDF) 15 Page - STMicroelectronics |
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M25PE20 Datasheet(HTML) 15 Page - STMicroelectronics |
15 / 37 page 15/37 M25PE10, M25PE20 Read Status Register (RDSR) The Read Status Register (RDSR) instruction al- lows the Status Register to be read. The Status Register may be read at any time, even while a Program, Erase or Write cycle is in progress. When one of these cycles is in progress, it is rec- ommended to check the Write In Progress (WIP) bit before sending a new instruction to the device. It is also possible to read the Status Register con- tinuously, as shown in Figure 11. The status bits of the Status Register are as fol- lows: WIP bit. The Write In Progress (WIP) bit indicates whether the memory is busy with a Write, Program or Erase cycle. When set to 1, such a cycle is in progress, when reset to 0 no such cycle is in progress. WEL bit. The Write Enable Latch (WEL) bit indi- cates the status of the internal Write Enable Latch. When set to 1 the internal Write Enable Latch is set, when set to 0 the internal Write Enable Latch is reset and no Write, Program or Erase instruction is accepted. Figure 11. Read Status Register (RDSR) Instruction Sequence and Data-Out Sequence C D S 2 1 3456789 10 11 12 13 14 15 Instruction 0 AI02031E Q 7 6543210 Status Register Out High Impedance MSB 7 6543210 Status Register Out MSB 7 |
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