鈻?/div>
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:
鈥?Power-up
鈥?Reset (RESET) driven Low
鈥?Write Disable (WRDI) instruction
completion
鈥?Page Write (PW) instruction completion
鈥?Page Program (PP) instruction completion
鈥?Page Erase (PE) instruction completion
鈥?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.
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