29C040 データシートの表示（PDF） - Atmel Corporation

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29C040

4 Megabit (512K x 8) 5-volt Only 256-Byte Sector CMOS Flash Memory

Atmel Corporation 

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

(4)

SECTOR (256 BYTES)

ENTER DATA

(2)

PROTECT STATE

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.

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

(4)

SECTOR (256 BYTES)

EXIT DATA

(3)

PROTECT STATE

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.

4-172

AT29C040A

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