AT29C257 Просмотр технического описания (PDF) - Atmel Corporation

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Компоненты Описание

производитель

AT29C257

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

LOAD DATA

TO

(4)

PAGE (64 BYTES)

WRITES ENABLED

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. 64-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)

PAGE (64 BYTES)

EXIT DATA

(3)

PROTECT STATE

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.

4-112

AT29C257

3. All bytes that are not loaded within the page being

programmed will be indeterminate.

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