29C256 查看數據表（PDF） - Atmel Corporation

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29C256

256K (32K x 8) 5-volt Only Flash Memory

Atmel Corporation 

Software Data Protection

Enable Algorithm(1)

LOAD DATA AA

TO

ADDRESS 5555

Software Data Protection

Disable Algorithm(1)

LOAD DATA AA

TO

ADDRESS 5555

LOAD DATA 55

TO

ADDRESS 2AAA

LOAD DATA 55

TO

ADDRESS 2AAA

LOAD DATA A0

TO

ADDRESS 5555

WRITES ENABLED(2)

LOAD DATA 80

TO

ADDRESS 5555

LOAD DATA

TO

PAGE (64 BYTES)(4)

ENTER DATA

PROTECT STATE

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 20

TO

ADDRESS 5555

EXIT DATA

PROTECT STATE(3)

LOAD DATA

TO

PAGE (64 BYTES)(4)

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.

10 AT29C256

0046P–FLASH–10/04

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