AT29C040A Просмотр технического описания (PDF) - Atmel Corporation

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AT29C040A

4-megabit (512K x 8) 5-volt Only 256-byte Sector Flash Memory

Atmel Corporation 

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

WRITES ENABLED

LOAD DATA

TO

SECTOR (256 BYTES)(4)

ENTER DATA

PROTECT STATE(2)

AT29C040A

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

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.

LOAD DATA 20

TO

ADDRESS 5555

EXIT DATA

PROTECT STATE(3)

LOAD DATA

TO

SECTOR (256 BYTES)(4)

20. 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.

11

0333L–FLASH–9/08

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