29C020 查看數據表（PDF） - Atmel Corporation

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29C020

2-Megabit (256K x 8) 5-volt Only CMOS Flash Memory

Atmel Corporation 

Software Data Protection Enable Algorithm()

LOAD DATA AA

TO

ADDRESS 5555

Software Data Protection Disable Algorithm()

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

LOAD DATA 80

TO

ADDRESS 5555

LOAD DATA

TO

PAGE (128 BYTES)(4)

ENTER DATA

PROTECT STATE(2)

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 (128 BYTES)(4)

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.

Software Protected Program Cycle Waveform(1)(4)(5)

Notes:

1. A8 through A17 must specify the sector address during each high-to-low transition of WE (or CE) after the software code

has been entered.

4. OE must be high when WE and CE are both low.

5. All bytes that are not loaded within the sector being programmed will be indeterminate.

10 AT29C020

0291M–FLASH–05/02

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