参数资料
型号: AT26DF081A-SSU
厂商: Atmel
文件页数: 15/40页
文件大小: 0K
描述: IC FLASH 8MBIT 70MHZ 8SOIC
标准包装: 100
格式 - 存储器: 闪存
存储器类型: DataFLASH
存储容量: 8M(4096 页 x 256 字节)
速度: 70MHz
接口: SPI 3 线串行
电源电压: 2.7 V ~ 3.6 V
工作温度: -40°C ~ 85°C
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
供应商设备封装: 8-SOIC
包装: 管件
AT26DF081A
Figure 8-6.
Chip Erase
C S
0
1
2
3
4
5
6
7
S CK
OPCODE
S I
C
C
C
C
C
C
C
C
M S B
S O
9. Protection Commands and Features
HIGH-IMPEDANCE
9.1
Write Enable
The Write Enable command is used to set the Write Enable Latch (WEL) bit in the Status Regis-
ter to a logical “1” state. The WEL bit must be set before a program, erase, Protect Sector,
Unprotect Sector, or Write Status Register command can be executed. This makes the issuance
of these commands a two step process, thereby reducing the chances of a command being
accidentally or erroneously executed. If the WEL bit in the Status Register is not set prior to the
issuance of one of these commands, then the command will not be executed.
To issue the Write Enable command, the CS pin must first be asserted and the opcode of 06h
must be clocked into the device. No address bytes need to be clocked into the device, and any
data clocked in after the opcode will be ignored. When the CS pin is deasserted, the WEL bit in
the Status Register will be set to a logical “1”. The complete opcode must be clocked into the
device before the CS pin is deasserted, and the CS pin must be deasserted on an even byte
boundary (multiples of eight bits); otherwise, the device will abort the operation and the state of
the WEL bit will not change.
Figure 9-1.
Write Enable
C S
0
1
2
3
4
5
6
7
S CK
OPCODE
S I
0
0
0
0
0
1
1
0
M S B
S O
HIGH-IMPEDANCE
15
3600G–DFLASH–06/09
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