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AT29C020-10 Datasheet(PDF) 11 Page - ATMEL Corporation

Part # AT29C020-10
Description  2-Megabit 256K x 8 5-volt Only CMOS Flash Memory
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT29C020-10 Datasheet(HTML) 11 Page - ATMEL Corporation

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0291S–FLASH–11/08
AT29C020
18. Software Data Protection
Enable Algorithm
(1)
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA A0
TO
ADDRESS 5555
LOAD DATA
TO
SECTOR (256 BYTES)(4)
WRITES ENABLED
ENTER DATA
PROTECT STATE (2)
19. 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
SECTOR (256 BYTES)(4)
EXIT DATA
PROTECT STATE(3)
20. Software Protected Program Cycle Waveform
(1)(2)(3)
Notes:
1. A8 through A17 must specify the sector 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 sector being programmed will be indeterminate.
Notes:
1. Data Format: I/O7 - I/O0 (Hex); Address Format: A14 - A0 (Hex).
2. Data Protect state will be activated at end of program cycle.
3. Data Protect state will be deactivated at end of program period.
4. 256 bytes of data MUST BE loaded.


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