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M45PE40-VMP6P Datasheet(PDF) 8 Page - STMicroelectronics |
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M45PE40-VMP6P Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 35 page M45PE40 8/35 mode until another specific instruction (the Re- lease from Deep Power-down and Read Electron- ic Signature (RES) instruction) is executed. All other instructions are ignored while the device is in the Deep Power-down mode. This can be used as an extra software protection mechanism, when the device is not in active use, to protect the device from inadvertent Write, Program or Erase instructions. Status Register The Status Register contains two status bits that can be read by the Read Status Register (RDSR) instruction. WIP bit. The Write In Progress (WIP) bit indicates whether the memory is busy with a Write, Program or Erase cycle. WEL bit. The Write Enable Latch (WEL) bit indi- cates the status of the internal Write Enable Latch. Table 2. Status Register Format Note: WEL and WIP are volatile read-only bits (WEL is set and re- set by specific instructions; WIP is automatically set and re- set by the internal logic of the device). Protection Modes The environments where non-volatile memory de- vices are used can be very noisy. No SPI device can operate correctly in the presence of excessive noise. To help combat this, the M45PE40 features the following data protection mechanisms: ■ Power On Reset and an internal timer (tPUW) can provide protection against inadvertant changes while the power supply is outside the operating specification. ■ Program, Erase and Write instructions are checked that they consist of a number of clock pulses that is a multiple of eight, before they are accepted for execution. ■ All instructions that modify data must be preceded by a Write Enable (WREN) instruction to set the Write Enable Latch (WEL) bit. This bit is returned to its reset state by the following events: – Power-up – Reset (RESET) driven Low – 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 ■ The Hardware Protected mode is entered when Write Protect (W) is driven Low, causing the first 256 pages of memory to become read-only. When Write Protect (W) is driven High, the first 256 pages of memory behave like the other pages of memory ■ The Reset (Reset) signal can be driven Low to protect the contents of the memory during any critical time, not just during Power-up and Power-down. ■ In addition to the low power consumption feature, the Deep Power-down mode offers extra software protection from inadvertant Write, Program and Erase instructions while the device is not in active use. b7 b0 0 0 0 0 0 0 WEL WIP |
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