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AT29C256 Datasheet(PDF) 10 Page - ATMEL Corporation

Part No. AT29C256
Description  256K 32K x 8 5-volt Only CMOS Flash Memory
Download  12 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT29C256 Datasheet(HTML) 10 Page - ATMEL Corporation

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AT29C256
0046P–FLASH–10/04
Software Data Protection
Enable Algorithm(1)
Notes:
1. Data Format: I/O7 - I/O0 (Hex);
Address Format: A14 - A0 (Hex).
2. Data Protect state will be re-activated at end of pro-
gram cycle.
3. Data Protect state will be deactivated at end of pro-
gram period.
4. 64 bytes of data MUST BE loaded.
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA A0
TO
ADDRESS 5555
LOAD DATA
TO
PAGE (64 BYTES)(4)
WRITES ENABLED(2)
ENTER DATA
PROTECT STATE
Software Data Protection
Disable Algorithm(1)
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA 80
TO
ADDRESS 5555
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA 20
TO
ADDRESS 5555
LOAD DATA
TO
PAGE (64 BYTES)(4)
EXIT DATA
PROTECT STATE(3)
Software Protected Program Cycle Waveform
(1)(2)(3)
Notes:
1. A6 through A14 must specify the page address during each high-to-low transition of WE (or CE) after the software code has
been entered.
2. OE must be high when WE and CE are both low.
3. All bytes that are not loaded within the page being programmed will be indeterminate.


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