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25AA040AX-E/P 데이터시트(PDF) 12 Page - Microchip Technology

부품명 25AA040AX-E/P
상세설명  4K SPI Bus Serial EEPROM
PDF  30 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

25AA040AX-E/P 데이터시트(HTML) 12 Page - Microchip Technology

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25AA040A/25LC040A
DS21827F-page 12
© 2009 Microchip Technology Inc.
2.7
Data Protection
The following protection has been implemented to
prevent 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
2.8
Power-On State
The 25XX040A 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-level transition on CS is required to
enter active state
TABLE 2-4:
WRITE-PROTECT FUNCTIONALITY MATRIX
WP
(pin 3)
WEL
(SR bit 1)
Protected Blocks
Unprotected Blocks
STATUS Register
0
(low)
x
Protected
Protected
Protected
1
(high)
0
Protected
Protected
Protected
1
(high)
1
Protected
Writable
Writable
x
= don’t care



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