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24AA640-EST bảng dữ liệu(PDF) 10 Page - Microchip Technology

tên linh kiện 24AA640-EST
Giải thích chi tiết về linh kiện  64K SPI Bus Serial EEPROM
PDF  12 Pages
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nhà sản xuất  MICROCHIP [Microchip Technology]
Trang chủ  http://www.microchip.com
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24AA640-EST bảng dữ liệu(HTML) 10 Page - Microchip Technology

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25AA640/25LC640/25C640
DS21223A-page 10
Preliminary
© 1997 Microchip Technology Inc.
3.7
Data Protection
The following protection has been implemented to pre-
vent inadvertent writes to the array:
• The write enable latch is reset on power-up.
• A write enable instruction must be issued to set
the write enable latch.
• After a byte write, page write, or status register
write, the write enable latch is reset.
• CS must be set high after the proper number of
clock cycles to start an internal write cycle.
• Access to the array during an internal write cycle
is ignored and programming is continued.
3.8
Power On State
The 25xx640 powers on in the following state:
• The device is in low power standby mode (CS = 1).
• The write enable latch is reset.
• SO is in high impedance state.
• A high to low transition on CS is required to enter
the active state.
.
TABLE 3-3:
WRITE PROTECT FUNCTIONALITY MATRIX
WPEN
WP
WEL
Protected Blocks
Unprotected Blocks
Status Register
X
X
0
Protected
Protected
Protected
0
X
1
Protected
Writable
Writable
1
Low
1
Protected
Writable
Protected
X
High
1
Protected
Writable
Writable



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