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ACE25C512 データシート(PDF) 8 Page - ACE Technology Co., LTD.

部品番号 ACE25C512
部品情報  512K-BIT Serial Flash Memory
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メーカー  ACE [ACE Technology Co., LTD.]
ホームページ  http://www.ace-ele.com
Logo ACE - ACE Technology Co., LTD.

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ACE25C512
512K-BIT Serial Flash Memory
VER 1.2
8
WIP Bit
WIP is a read only bit in the status register (S0) that is set to a 1 state when the device is executing a
Page Program, Sector Erase, Block Erase, Chip Erase, Write Status Register. During this time the
device will ignore further instructions except for the Read Status Register and Erase/Program
Suspend instruction (see tW, tPP, tSE, tBE, and tCE in “12.6 AC Electrical Characteristics”). When the
program, erase or write status register (or security sector) instruction has completed, the WIP bit will
be cleared to a 0 state indicating the device is ready for further instructions.
Write Enable Latch bit (WEL)
Write Enable Latch (WEL) is a read only bit in the status register (S1) that is set to 1 after executing a
Write Enable Instruction. The WEL status bit is cleared to 0 when the device is write disabled. A write
disable state occurs upon power-up or after any of the following instructions: Write Disable, Page
Program, Sector Erase, Block Erase, Chip Erase, Write Status Register.
Block Protect Bits (BP2, BP1,BP0)
The Block Protect Bits (BP2, BP1, BP0) are non-volatile read/write bits in the status register (S4, S3,
and S2) that provide Write Protection control and status. Block Protect bits can be set using the Write
Status Register Instruction (see tW in “12.6 AC Electrical Characteristics”). All, none or a portion of the
memory array can be protected from Program and Erase instructions (see Table 2 Status Register
Memory Protection). The factory default setting for the Block Protection Bits is 0, none of the array
protected.
Top/Bottom Block Protect (TB)
The non-volatile Top/Bottom bit (TB) controls if the Block Protect Bits (BP2, BP1, BP0) protect from
the Top (TB=0) or the Bottom (TB=1) of the array as shown in Table 2 Status Register Memory
Protection table. The factory default setting is TB=0. The TB bit can be set with the write Status
Register Instruction depending on the state of the SRP0, SRP1 and WEL bits.
Status Register Protect bit / Lock_bit (SRP/LB)
The Status Register Protect (SRP) bit is operated in conjunction with the Write Protect ( WP#) signal.
The Status Register Write Protect (SRP) bit and Write Protect (WP#) signal allow the device to be put
in the Hardware Protected mode (when the Status Register Protect (SRP) bit is set to 1, and Write
Protect (WP#) is driven Low). In this mode, the non-volatile bits of the Status Register (SRP, BP2,
BP1, BP0) become read-only bits and the Write Status Register (WRSR) instruction is no longer
accepted for execution.
In OTP mode, this bit is served as Lock_bit (LB), user can read/program/erase sec urity sector as
normal sector while LB value is equal 0, after LB is programmed with 1 by WRSR command, the
security sector is protected from program and erase operation. The LB can only be programmed once.
Note: In OTP mode, the WRSR command will ignore any input data and program LB to 1, user must clear the protect bits
before enter OTP mode and program the OTP code, then execute WRSR command to lock the security sector before
leaving OTP mode.


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