參數(shù)資料
型號(hào)： M95128-DW3GP
廠商： 意法半導(dǎo)體
元件分類： DRAM
英文描述： 128 Kbit Serial SPI bus EEPROM with high speed clock
中文描述： 128千位的SPI高速時(shí)鐘總線的EEPROM
文件頁(yè)數(shù)： 18/41頁(yè)
文件大?。?/td> 207K
代理商： M95128-DW3GP
Instructions
M95128, M95128-W, M95128-R
18/41
Table 5.
The protection features of the device are summarized in
Table 2
.
When the Status Register Write Disable (SRWD) bit of the Status Register is 0 (its initial
delivery state), it is possible to write to the Status Register provided that the Write Enable
Latch (WEL) bit has previously been set by a Write Enable (WREN) instruction, regardless
of the whether Write Protect (W) is driven High or Low.
When the Status Register Write Disable (SRWD) bit of the Status Register is set to 1, two
cases need to be considered, depending on the state of Write Protect (W):
If Write Protect (W) is driven High, it is possible to write to the Status Register provided
that the Write Enable Latch (WEL) bit has previously been set by a Write Enable
(WREN) instruction.
If Write Protect (W) is driven Low, it is
not
possible to write to the Status Register
even
if the Write Enable Latch (WEL) bit has previously been set by a Write Enable (WREN)
instruction. (Attempts to write to the Status Register are rejected, and are not accepted
for execution). As a consequence, all the data bytes in the memory area that are
software protected (SPM) by the Block Protect (BP1, BP0) bits of the Status Register,
are also hardware protected against data modification.
●
●
Regardless of the order of the two events, the Hardware Protected Mode (HPM) can be
entered:
by setting the Status Register Write Disable (SRWD) bit after driving Write Protect (W)
Low
or by driving Write Protect (W) Low after setting the Status Register Write Disable
(SRWD) bit.
●
●
The only way to exit the Hardware Protected Mode (HPM) once entered is to pull Write
Protect (W) High.
If Write Protect (W) is permanently tied High, the Hardware Protected Mode (HPM) can
never be activated, and only the Software Protected Mode (SPM), using the Block Protect
(BP1, BP0) bits of the Status Register, can be used.
Protection modes
W Signal
SRWD
Bit
Mode
Write Protection of the
Status Register
Memory Content
Protected Area
(1)
1.
As defined by the values in the Block Protect (BP1, BP0) bits of the Status Register, as shown in
Table 5
.
Unprotected Area
(1)
1
0
Software
Protected
(SPM)
Status Register is
Writable (if the WREN
instruction has set the
WEL bit)
The values in the BP1
and BP0 bits can be
changed
Write Protected
Ready to accept Write
instructions
0
0
1
1
0
1
Hardware
Protected
(HPM)
Status Register is
Hardware write
protected
The values in the BP1
and BP0 bits cannot be
changed
Write Protected
Ready to accept Write
instructions
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