w29c040 Winbond Electronics Corp America, w29c040 Datasheet - Page 6

• Manufacturer Part Number: w29c040
• Description: 512k X 8 Cmos Flash Memory
• Manufacturer: Winbond Electronics Corp America

Command Codes for Software Data Protection
Software Data Protection Acquisition Flow
Notes for software program code:
Data Format: DQ7 DQ0 (Hex)
Address Format: A14 A0 (Hex)
BYTE SEQUENCE
0 Write
1 Write
2 Write
3 Write
4 Write
5 Write
(Optional page-load
operation)
TO ENABLE PROTECTION
ADDRESS
2AAAH
5555H
5555H
Software Data Protection
Enable Flow
Sequentially load
-
-
-
up to 256 bytes
address 2AAA
address 5555
Load data AA
Pause 10 mS
address 5555
of page data
Load data 55
Load data A0
Exit
to
to
to
- 6 -
DATA
AAH
A0H
55H
-
-
-
Software Data Protection
Disable Flow
address 2AAA
address 2AAA
address 5555
Load data AA
address 5555
address 5555
address 5555
Load data AA
Load data 55
Load data 20
Load data 55
Load data 80
Pause 10 mS
TO DISABLE PROTECTION
ADDRESS
Exit
to
to
to
to
to
to
2AAAH
2AAAH
5555H
5555H
5555H
5555H
W29C040
DATA
AAH
AAH
55H
80H
55H
20H