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25AA040AT-E/MS 데이터시트(PDF) 9 Page - Microchip Technology

부품명 25AA040AT-E/MS
상세설명  4K SPI Bus Serial EEPROM
PDF  28 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

25AA040AT-E/MS 데이터시트(HTML) 9 Page - Microchip Technology

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© 2007 Microchip Technology Inc.
DS21827D-page 9
25AA040A/25LC040A
2.4
Write Enable (WREN) and Write
Disable (WRDI)
The 25XX040A 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
•WP pin is brought low
FIGURE 2-4:
WRITE ENABLE SEQUENCE (WREN)
FIGURE 2-5:
WRITE DISABLE SEQUENCE (WRDI)
SCK
0
2
34
56
7
1
SI
High-impedance
SO
CS
01
00
00
0
1
SCK
0
2345
67
1
SI
High-impedance
SO
CS
01
00
00
0
10



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