- 您现在的位置：买卖IC网 > Sheet目录337 > LH28F320SKTD-ZR (Sharp Microelectronics)IC FLASH 32MBIT 70NS 48TSOP
LHF32KZR
21
4.12 Set Block Lock-Bit Command
A flexible block locking and unlocking scheme is
enabled via block lock-bits. The block lock-bits gate
program and erase operations With WP#=V IH ,
individual block lock-bits can be set using the Set
Block Lock-Bit command. See Table 13 for a
summary of hardware and software write protection
options.
Set block lock-bit is executed by a two-cycle
command sequence. The set block lock-bit setup
along with appropriate block or device address is
written followed by either the set block lock-bit
confirm (and an address within the block to be
locked). The WSM then controls the set block lock-bit
algorithm. After the sequence is written, the device
automatically outputs status register data when read
(see Figure 12). The CPU can detect the completion
of the set block lock-bit event by analyzing the STS
pin output or status register bit SR.7.
When the set block lock-bit operation is complete,
status register bit SR.4 should be checked. If an error
is detected, the status register should be cleared.
The CUI will remain in read status register mode until
a new command is issued.
This two-step sequence of set-up followed by
execution ensures that block lock-bits are not
accidentally set. An invalid Set Block Lock-Bit
command will result in status register bits SR.4 and
SR.5 being set to "1". Also, reliable operations occur
only when V CC =V CC1/2/3/4 and V PP =V PPH1/2/3 . In the
absence of this high voltage, block lock-bit contents
are protected against alteration.
A successful set block lock-bit operation requires
WP#=V IH . If it is attempted with WP#=V IL , SR.1 and
SR.4 will be set to "1" and the operation will fail. Set
block lock-bit operations with WP#<V IH produce
spurious results and should not be attempted.
block lock-bits can be cleared using only the Clear
Block Lock-Bits command. See Table 13 for a
summary of hardware and software write protection
options.
Clear block lock-bits operation is executed by a two-
cycle command sequence. A clear block lock-bits
setup is first written. After the command is written, the
device automatically outputs status register data
when read (see Figure 13). The CPU can detect
completion of the clear block lock-bits event by
analyzing the STS Pin output or status register bit
SR.7.
When the operation is complete, status register bit
SR.5 should be checked. If a clear block lock-bit error
is detected, the status register should be cleared.
The CUI will remain in read status register mode until
another command is issued.
This two-step sequence of set-up followed by
execution ensures that block lock-bits are not
accidentally cleared. An invalid Clear Block Lock-Bits
command sequence will result in status register bits
SR.4 and SR.5 being set to "1". Also, a reliable clear
block lock-bits operation can only occur when
V CC =V CC1/2/3/4 and V PP =V PPH1/2/3 . If a clear block
lock-bits operation is attempted while V PP ≤ V PPLK ,
SR.3 and SR.5 will be set to "1". In the absence of
this high voltage, the block lock-bits content are
protected against alteration. A successful clear block
lock-bits operation requires WP#=V IH . If it is
attempted with WP#=V IL , SR.1 and SR.5 will be set
to "1" and the operation will fail. Clear block lock-bits
operations with V IH <RP# produce spurious results
and should not be attempted.
If a clear block lock-bits operation is aborted due to
V PP or V CC transitioning out of valid range or RP#
active transition, block lock-bit values are left in an
undetermined state. A repeat of clear block lock-bits
is required to initialize block lock-bit contents to
known values.
4.13 Clear Block Lock-Bits Command
All set block lock-bits are cleared in parallel via the
Clear Block Lock-Bits command. With WP#=V IH ,
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
LHF00L28
IC FLASH 16MBIT 70NS 48TSOP
LPM409 CHASSIS
STNRD 4SLOT CHASSIS W/INPUT LEAD
LS15RB1201J04
POE SPLITTER 10.8W 12V @0.9A
LT1932ES6#TRMPBF
IC LED DRIVR WHITE BCKLGT TSOT-6
LT1937ES5#TRMPBF
IC LED DRIVR WHITE BCKLGT TSOT-5
LT3003EMSE#TRPBF
IC LED DRIVER BALLASTER 10-MSOP
LT3465AES6#TRMPBF
IC LED DRIVR WHITE BCKLGT TSOT-6
LT3466EDD-1#PBF
IC LED DRIVR WHITE BCKLGT 10-DFN
相关代理商/技术参数
LH28F400BG
制造商:SHARP 制造商全称:Sharp Electrionic Components 功能描述:4M-BIT(256KBx16) SmartVoltage Flash MEMORY
LH28F400BGB-BL12
制造商:未知厂家 制造商全称:未知厂家 功能描述:x16 Flash EEPROM
LH28F400BGB-BL85
制造商:未知厂家 制造商全称:未知厂家 功能描述:x16 Flash EEPROM
LH28F400BGB-TL12
制造商:未知厂家 制造商全称:未知厂家 功能描述:x16 Flash EEPROM
LH28F400BGB-TL85
制造商:未知厂家 制造商全称:未知厂家 功能描述:x16 Flash EEPROM
LH28F400BGE-BL12
制造商:未知厂家 制造商全称:未知厂家 功能描述:x16 Flash EEPROM
LH28F400BGE-BL85
制造商:未知厂家 制造商全称:未知厂家 功能描述:x16 Flash EEPROM
LH28F400BGE-TL12
制造商:未知厂家 制造商全称:未知厂家 功能描述:x16 Flash EEPROM