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25AA640-E/P датащи(PDF) 12 Page - Microchip Technology

номер детали 25AA640-E/P
подробное описание детали  64K SPI Bus Serial EEPROM
PDF  24 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

25AA640-E/P датащи(HTML) 12 Page - Microchip Technology

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25AA640/25LC640
DS21223G-page 12
 2004 Microchip Technology Inc.
3.7
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
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
XX
0
Protected
Protected
Protected
0X
1
Protected
Writable
Writable
1
Low
1
Protected
Writable
Protected
X
High
1
Protected
Writable
Writable



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