參數(shù)資料
型號: 25AA1024
廠商: Microchip Technology Inc.
英文描述: 1 Mbit SPI Bus Serial EEPROM
中文描述: 1兆位SPI總線串行EEPROM
文件頁數(shù): 10/30頁
文件大小: 459K
代理商: 25AA1024
25AA1024/25LC1024
DS21836D-page 10
Preliminary
2007 Microchip Technology Inc.
2.3
Write Enable (
WREN
) and Write
Disable (
WRDI
)
The 25XX1024 contains a write enable latch. See
Table 2-4 for the Write-Protect Functionality Matrix.
This latch must be set before any write operation will be
completed internally. The
WREN
instruction will set the
latch, and the
WRDI
will reset the latch.
The following is a list of conditions under which the
write enable latch will be reset:
Power-up
WRDI
instruction successfully executed
WRSR
instruction successfully executed
WRITE
instruction successfully executed
PE
instruction successfully executed
SE
instruction successfully executed
CE
instruction successfully executed
FIGURE 2-4:
WRITE ENABLE SEQUENCE (
WREN
)
FIGURE 2-5:
WRITE DISABLE SEQUENCE (
WRDI
)
SCK
0
2
3
4
5
6
7
1
SI
High-Impedance
SO
CS
0
1
0
0
0
0
0
1
SCK
0
2
3
4
5
6
7
1
SI
High-Impedance
SO
CS
0
1
0
0
0
0
0
1
0
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