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AT29C040A Datasheet(PDF) 8 Page - ATMEL Corporation

Part No. AT29C040A
Description  4-Megabit 512K x 8 5-volt Only 256-Byte Sector CMOS Flash Memory
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT29C040A Datasheet(HTML) 8 Page - ATMEL Corporation

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Software Protected Program Cycle Waveform
(1, 2, 3)
Notes: 1. A8 through A18 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.
LOAD DATA
TO
SECTOR (256 BYTES)
(4)
LOAD DATA A0
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA AA
TO
ADDRESS 5555
Notes for software program code:
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.
ENTER DATA
PROTECT STATE
(2)
WRITES ENABLED
Software Data
Protection Enable Algorithm
(1)
LOAD DATA
TO
SECTOR (256 BYTES)
(4)
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 80
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 20
TO
ADDRESS 5555
EXIT DATA
PROTECT STATE
(3)
Software Data
Protection Disable Algorithm
(1)
8
AT29C040A


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