参数资料
型号: AT26DF161A-MU
厂商: Atmel
文件页数: 18/41页
文件大小: 0K
描述: IC FLASH 16MBIT 70MHZ 8QFN
标准包装: 490
格式 - 存储器: 闪存
存储器类型: DataFLASH
存储容量: 16M(8192 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-VQFN 裸露焊盘
供应商设备封装: 8-VDFN(6x5)
包装: 托盘
9.5
18
Global Protect/Unprotect
The Global Protect and Global Unprotect features can work in conjunction with the Protect Sec-
tor and Unprotect Sector functions. For example, a system can globally protect the entire
memory array and then use the Unprotect Sector command to individually unprotect certain sec-
tors and individually reprotect them later by using the Protect Sector command. Likewise, a
system can globally unprotect the entire memory array and then individually protect certain sec-
tors as needed.
Performing a Global Protect or Global Unprotect is accomplished by writing a certain combina-
tion of data to the Status Register using the Write Status Register command (see “Write Status
Register” section on page 26 for command execution details). The Write Status Register com-
mand is also used to modify the SPRL (Sector Protection Registers Locked) bit to control
hardware and software locking.
To perform a Global Protect, the appropriate WP pin and SPRL conditions must be met, and the
system must write a logical “1” to bits 5, 4, 3, and 2 of the Status Register. Conversely, to per-
form a Global Unprotect, the same WP and SPRL conditions must be met but the system must
write a logical “0” to bits 5, 4, 3, and 2 of the Status Register. Table 9-2 details the conditions
necessary for a Global Protect or Global Unprotect to be performed.
AT26DF161A
3640D–DFLASH–8/09
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