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參數(shù)資料
| 型號： | 25AA320 |
| 廠商： | Microchip Technology Inc. |
| 元件分類： | EEPROM |
| 英文描述： | 32K SPI Bus Serial EEPROM |
| 中文描述： | 32K的SPI總線串行EEPROM |
| 文件頁數(shù)： | 11/24頁 |
| 文件大?。?/td> | 383K |
| 代理商： | 25AA320 |
2004 Microchip Technology Inc.
DS21227E-page 11
25AA320/25LC320/25C320
3.6
Write Status Register Instruction
(
WRSR
)
The Write Status Register instruction (
WRSR
) 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 to write-protect none, one, two,
or all four of the segments of the array. The partitioning
is controlled as shown in Table 3-2.
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 program-
mable hardware write-protect feature. Hardware 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 3-3 for a matrix of functionality on the WPEN
bit.
See Figure 3-7 for the WRSR timing sequence.
TABLE 3-2:
ARRAY PROTECTION
FIGURE 3-7:
WRITE STATUS REGISTER TIMING SEQUENCE
BP1
BP0
Array Addresses
Write-Protected
0
0
0
1
none
upper 1/4
(0C00h - 0FFFh)
upper 1/2
(0800h - 0FFFh)
all
(0000h - 0FFFh)
1
0
1
1
SO
SI
CS
9
10
11
12
13
14
15
0
1
0
0
0
0
0
0
7
6
5
4
2
1
0
instruction
data to Status register
High-impedance
SCK
0
2
3
4
5
6
7
1
8
3
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| 25AA320/25LC320/25C320 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:25AA320/25LC320/25C320 Datasheet |
| 25AA320_08 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:32K SPI Bus Serial EEPROM |
| 25AA320A | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:32K SPI Bus Serial EEPROM |
| 25AA320A_07 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:32K SPI Bus Serial EEPROM |
| 25AA320A_09 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:32K SPI Bus Serial EEPROM |
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