EN25P05
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 a number of status and control bits that can be read
or set (as appropriate) by specific instructions.
WIP bit. The WIP bit indicates whether the memory is busy with a Write Status Register, Program or
Erase cycle.
WEL bit. The Write Enable Latch (WEL) bit indicates the status of the internal Write Enable Latch.
BP1, BP0 bits. The Block Protect (BP1, BP0) bits are non-volatile. They define the size of the area
to be software protected against Program and Erase instructions.
SRP bit. The Status Register Protect (SRP) bit is operated in conjunction with the Write Protect
(WP#) signal. The Status Register Protect (SRP) bit and Write Protect (WP#) signal allow the device
to be put in the Hardware Protected mode. In this mode, the non-volatile bits of the Status Register
(SRP, BP1, BP0) become read-only bits.
Write Protection
Applications that use non-volatile memory must take into consideration the possibility of noise and
other adverse system conditions that may compromise data integrity. To address this concern the
EN25P05 provides the following data protection mechanisms:
z
Power-On Reset and an internal timer (t ) can provide protection against inadvertent
PUW
changes while the power supply is outside the operating specification.
Program, Erase and Write Status Register 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
z
z
–
Write Disable (WRDI) instruction completion or Write Status Register (WRSR) instruction
completion or Page Program (PP) instruction completion or Sector Erase (SE)instruction
completion or Bulk Erase (BE) instruction completion or
z
z
z
The Block Protect (BP1, BP0) bits allow part of the memory to be configured as read-only. This
is the Software Protected Mode (SPM).
The Write Protect (WP#) signal allows the Block Protect (BP1, BP0) bits and Status Register
Protect (SRP) bit to be protected. This is the Hardware Protected Mode (HPM).
In addition to the low power consumption feature, the Deep Power-down mode offers extra
software protection from inadvertent Write, Program and Erase instructions, as all instructions
are ignored except one particular instruction (the Release from Deep Power-down instruction).
Table 3. Protected Area Sizes Sector Organization
Memory Content
BP1
Bit
1
BP0
Bit
1
Addresses
Density(KB)
Portion
Protected Sectors
All ( Sector 0 to 1)
000000h-00FFFFh
64KB
All sectors
1
0
0
1
PP(page program), and SE(sector erase) is enabled without checking address.
All sectors are protected against BE(bulk erase).
0
0
None
None
None
None
This Data Sheet may be revised by subsequent versions
or modifications due to changes in technical specifications.
©2004 Eon Silicon Solution, Inc., www.essi.com.tw
6
Rev. C, Issue Date: 2008/01/17
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