参数资料
型号: AT45DB021D_07
厂商: Atmel Corp.
英文描述: 2-megabit 2.7-volt DataFlash
中文描述: 2兆位2.7伏的DataFlash
文件页数: 14/52页
文件大小: 1108K
代理商: AT45DB021D_07
14
3638B–DFLASH–02/07
AT45DB021D [Preliminary]
9.1
Sector Protection Register
The nonvolatile Sector Protection Register specifies which sectors are to be protected or unpro-
tected with either the software or hardware controlled protection methods. The Sector Protection
Register contains 8 bytes of data, of which byte locations 0 through 7 contain values that specify
whether sectors 0 through 7 will be protected or unprotected. The Sector Protection Register is
user modifiable and must first be erased before it can be reprogrammed.
Table 9-3
illustrates the
format of the Sector Protection Register.
Note:
1. The default value for bytes 0 through 7 when shipped from Atmel
is 00H.
x = don’t care.
Table 9-2.
Sector Protection Register
Sector Number
0 (0a, 0b)
1 to 7
Protected
See
Table 9-3
FFH
Unprotected
00H
Table 9-3.
Sector 0 (0a, 0b)
0a
0b
Bit 3, 2
Data
Value
(Page 0-7)
(Page 8-127)
Bit 7, 6
Bit 5, 4
Bit 1, 0
Sectors 0a, 0b Unprotected
00
00
xx
xx
0xH
Protect Sector 0a
11
00
xx
xx
CxH
Protect Sector 0b (Page 8-127)
00
11
xx
xx
3xH
Protect Sectors 0a (Page 0-7), 0b
(Page 8-127)
(1)
11
11
xx
xx
FxH
相关PDF资料
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AT45DB021D-MU 2-megabit 2.7-volt DataFlash
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AT45DB021D-MH-Y 功能描述:闪存 2 Megabit 2.7V-3.6V RoHS:否 制造商:ON Semiconductor 数据总线宽度:1 bit 存储类型:Flash 存储容量:2 MB 结构:256 K x 8 定时类型: 接口类型:SPI 访问时间: 电源电压-最大:3.6 V 电源电压-最小:2.3 V 最大工作电流:15 mA 工作温度:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体: 封装:Reel
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