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参数资料
| 型号： | 25AA256-EMF |
| 厂商： | Microchip Technology Inc. |
| 元件分类： | EEPROM |
| 英文描述： | 256K SPI Bus Serial EEPROM |
| 中文描述： | 256K SPI总线串行EEPROM |
| 文件页数： | 3/26页 |
| 文件大小： | 367K |
| 代理商： | 25AA256-EMF |
2003 Microchip Technology Inc.
Preliminary
DS21822C-page 11
25AA256/25LC256
2.6
Write Status Register Instruction
(WRSR)
The Write Status Register instruction (WRSR) allows the
user to write to the nonvolatile bits in the Status register
as shown in Table 2-2. The user is able 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
to write-protect none, one, two, or all four of the
segments of the array. The partitioning is controlled as
shown in Table 2-3.
The Write-Protect Enable (WPEN) bit is a nonvolatile
bit that is available as an enable bit for the WP pin. The
Write-Protect (WP) pin and the Write-Protect Enable
(WPEN)
bit
in
the
Status
register
control
the
programmable hardware write-protect feature. Hard-
ware write protection is enabled when WP pin is low
and the WPEN bit is high. Hardware write protection is
disabled when either the WP pin is high or the WPEN
bit is low. When the chip is hardware write-protected,
only writes to nonvolatile bits in the Status register are
disabled. See Table 2-4 for a matrix of functionality on
the WPEN bit.
See Figure 2-7 for the WRSR timing sequence.
TABLE 2-3:
ARRAY PROTECTION
FIGURE 2-7:
WRITE STATUS REGISTER TIMING SEQUENCE (WRSR)
BP1
BP0
Array Addresses
Write-Protected
00
none
01
upper 1/4
(6000h - 7FFFh)
10
upper 1/2
(4000h - 7FFFh)
11
all
(0000h - 7FFFh)
SO
SI
CS
9
1011
12131415
01
0
00
76
5
4
21
0
instruction
data to Status register
high-impedance
SCK
0
2
34
56
7
1
8
3
Note:
An internal write cycle (TWC) is initiated on the rising edge of CS after a valid write Status Register sequence.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 25AA256-EMFG | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:256K SPI Bus Serial EEPROM |
| 25AA256EP | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:256K SPI Bus Serial EEPROM |
| 25AA256-EP | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:256K SPI Bus Serial EEPROM |
| 25AA256-EPG | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:256K SPI Bus Serial EEPROM |
| 25AA256ESM | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:256K SPI Bus Serial EEPROM |
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