W29C040P-12B Ver la hoja de datos (PDF) - Winbond

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W29C040P-12B

512K ´8 CMOS FLASH MEMORY

Winbond 

W29C040

Command Codes for Software Data Protection

BYTE SEQUENCE

0 Write

1 Write

2 Write

3 Write

4 Write

5 Write

TO ENABLE PROTECTION

ADDRESS

DATA

5555H

AAH

2AAAH

55H

5555H

A0H

-

-

-

-

-

-

TO DISABLE PROTECTION

ADDRESS

DATA

5555H

AAH

2AAAH

55H

5555H

80H

5555H

AAH

2AAAH

55H

5555H

20H

Software Data Protection Acquisition Flow

Software Data Protection

Enable Flow

Load data AA

to

address 5555

Load data 55

to

address 2AAA

Load data A0

to

address 5555

(Optional page-load

operation)

Sequentially load

up to 256 bytes

of page data

Pause 10 mS

Exit

Notes for software program code:

Data Format: DQ7−DQ0 (Hex)

Address Format: A14−A0 (Hex)

Software Data Protection

Disable Flow

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

Pause 10 mS

Exit

-6-

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