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AT45DB081B-CC-2.5 Datasheet(PDF) 27 Page - ATMEL Corporation

Part # AT45DB081B-CC-2.5
Description  8-megabit 2.5-volt Only or 2.7-volt Only DataFlash
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT45DB081B-CC-2.5 Datasheet(HTML) 27 Page - ATMEL Corporation

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AT45DB081B
2225I–DFLSH–9/05
Figure 2. Algorithm for Randomly Modifying Data
Notes:
1. To preserve data integrity, each page of a DataFlash sector must be updated/rewritten at least once within every 10,000
cumulative page erase/program operations.
2. A Page Address Pointer must be maintained to indicate which page is to be rewritten. The Auto Page Rewrite command
must use the address specified by the Page Address Pointer.
3. Other algorithms can be used to rewrite portions of the Flash array. Low-power applications may choose to wait until 10,000
cumulative page erase/program operations have accumulated before rewriting all pages of the sector. See application note
AN-4 (“Using Atmel’s Serial DataFlash”) for more details.
Sector Addressing
PA11
PA10
PA9
PA8
PA7
PA6
PA5
PA4
PA3
PA2 - PA0
Sector
000000000
X
0
0000
XXXXXX
1
0001
XXXXXX
2
0
0
1
XXXXXXX
3
1
0
0
XXXXXXX
6
1
0
1
XXXXXXX
7
1
1
0
XXXXXXX
8
1
1
1
XXXXXXX
9
START
MAIN MEMORY PAGE
TO BUFFER TRANSFER
(53H, 55H)
INCREMENT PAGE
ADDRESS POINTER
(2)
AUTO PAGE REWRITE
(2)
(58H, 59H)
END
provide address of
page to modify
If planning to modify multiple
bytes currently stored within
a page of the Flash array
MAIN MEMORY PAGE PROGRAM
THROUGH BUFFER
(82H, 85H)
BUFFER WRITE
(84H, 87H)
BUFFER TO MAIN
MEMORY PAGE PROGRAM
(83H, 86H)


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