收藏本站
25AA040/25LC040/25C040
3.5
Read Status Register (RDSR)
3.6
Write Status Register (WRSR)
The RDSR instruction provides access to the STATUS
register. The STATUS register may be read at any time,
even during a write cycle. The STATUS register is
formatted as follows:
The WRSR instruction allows the user to select one of
four levels of protection for the array by writing to the
appropriate bits in the STATUS register. The array is
divided up into four segments. The user has the ability
7
X
6
X
5
X
4
X
3
BP1
2
BP0
1
WEL
0
WIP
to write-protect none, one, two, or all four of the
segments of the array. The partitioning is controlled as
illustrated in Table 3-2.
The Write-In-Process (WIP) bit indicates whether the
25XX040 is busy with a write operation. When set to a
See Figure 3-7 for WRSR timing sequence.
‘ 1 ’, a write is in progress, when set to a ‘ 0 ’, no write is
in progress. This bit is read-only.
TABLE 3-2:
ARRAY PROTECTION
The Write Enable Latch (WEL) bit indicates the status
of the write enable latch. When set to a ‘ 1 ’, the latch
allows writes to the array, when set to a ‘ 0 ’, the latch
prohibits writes to the array. The state of this bit can
always be updated via the WREN or WRDI commands
regardless of the state of write protection on the
STATUS register. This bit is read-only.
The Block Protection (BP0 and BP1) bits indicate
which blocks are currently write-protected. These bits
are set by the user issuing the WRSR instruction. These
BP1
0
0
1
1
BP0
0
1
0
1
Array Addresses
Write-Protected
none
upper 1/4
(0180h-01FFh)
upper 1/2
(0100h-01FFh)
all
(0000h-01FFh)
bits are nonvolatile.
See Figure 3-6 for RDSR timing sequence.
FIGURE 3-6:
CS
READ STATUS REGISTER SEQUENCE
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
SCK
Instruction
SI
0
0
0
0
0
1
0
1
SO
High-impedance
7
Data from STATUS register
6 5 4 3 2 1
0
FIGURE 3-7:
CS
WRITE STATUS REGISTER SEQUENCE
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
SCK
Instruction
Data to STATUS register
SI
0
0
0
0
0
0
0
1
7
6
5
4
3
2
1
0
High-impedance
SO
DS21204E-page 10
? 2006 Microchip Technology Inc.
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
25C080-I/P IC EEPROM 8KBIT 3MHZ 8DIP
25C320-E/P IC EEPROM 32KBIT 3MHZ 8DIP
25LC010AT-E/MC IC EEPROM 1KBIT 10MHZ 8DFN
25LC040AT-E/MC IC EEPROM 4KBIT 10MHZ 8DFN
25LC080A-I/STG IC EEPROM 8KBIT 10MHZ 8TSSOP
25LC1024T-E/MF IC EEPROM 1MBIT 20MHZ 8DFN
25LC128-E/MF IC EEPROM 128KBIT 10MHZ 8DFN
25LC160/P IC EEPROM 16KBIT 2MHZ 8DIP
相关代理商/技术参数
25C040X-E/P 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:4K SPI ⑩ Bus Serial EEPROM
25C040X-E/SN 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:4K SPI ⑩ Bus Serial EEPROM
25C040X-E/ST 功能描述:电可擦除可编程只读存储器 512x8 - 5V Rot Pin RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
25C040X-EST 制造商:未知厂家 制造商全称:未知厂家 功能描述:SPI Serial EEPROM
25C040X-I/P 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:4K SPI ⑩ Bus Serial EEPROM
25C040X-I/SN 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:4K SPI ⑩ Bus Serial EEPROM
25C040X-I/ST 功能描述:电可擦除可编程只读存储器 512x8 - 5V Rot Pin RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
25C040X-I/STG 功能描述:电可擦除可编程只读存储器 512x8 - 5V Rot Pin Lead Free Package RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8