參數資料
型號： 25C640
廠商： Microchip Technology Inc.
英文描述： 64K SPI Bus Serial EEPROM
中文描述： 64K的SPI總線串行EEPROM
文件頁數： 8/12頁
文件大?。?/td> 196K
代理商： 25C640
25AA640/25LC640/25C640
DS21223A-page 8
Preliminary
1997 Microchip Technology Inc.
3.4
Write Enable (WREN) and Write
Disable (WRDI)
The 25xx640 contains a write enable latch. See
Table 3-3 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
FIGURE 3-4:
WRITE ENABLE SEQUENCE
FIGURE 3-5:
WRITE DISABLE SEQUENCE
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
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