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25C040XT-I/SN bảng dữ liệu(PDF) 9 Page - Microchip Technology

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nhà sản xuất  MICROCHIP [Microchip Technology]
Trang chủ  http://www.microchip.com
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25C040XT-I/SN bảng dữ liệu(HTML) 9 Page - Microchip Technology

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© 2006 Microchip Technology Inc.
DS21204E-page 9
25AA040/25LC040/25C040
3.4
Write Enable (WREN) and Write
Disable (WRDI)
The 25XX040 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
•WP line is low
FIGURE 3-4:
WRITE ENABLE SEQUENCE
FIGURE 3-5:
WRITE DISABLE SEQUENCE
SCK
0
234567
1
SI
High-impedance
SO
CS
01
0000
0
1
SCK
0
234567
1
SI
High-impedance
SO
CS
01
0000
0
10



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