at29c1024 ATMEL Corporation, at29c1024 Datasheet - Page 8

• Manufacturer Part Number: at29c1024
• Description: 1-megabit 64k X 16 5-volt Only Flash Memory
• Manufacturer: ATMEL Corporation

Software Data Protection
Enable Algorithm
Notes for software program code:
1. Data Format: I/O15 - I/O0 (Hex);
2. Write Protect state will be activated at end of write
3. Write Protect state will be deactivated at end of
4. 128 words of data MUST BE loaded.
Software Protected Program Cycle Waveform
Note:
8
Address Format: A14 - A0 (Hex).
period even if no other data is loaded.
write period even if no other data is loaded.
1.
2.
3.
A7 through A16 must specify the same page address during each high to low transition of WE (or CE) after the software
code has been entered.
OE must be high when WE and CE are both low.
All bytes that are not loaded within the sector being programmed will be indeterminate.
SECTOR (128 WORDS)
LOAD DATA AAAA
LOAD DATA A0A0
LOAD DATA 5555
ADDRESS 2AAA
ADDRESS 5555
ADDRESS 5555
LOAD DATA
TO
TO
TO
TO
AT29C1024
(1)
(4)
WRITES ENABLED
ENTER DATA
PROTECT STATE
(2)
Software Data Protection
Disable Algorithm
(1)(2)(3)
SECTOR (128 WORDS)
LOAD DATA AAAA
LOAD DATA AAAA
LOAD DATA XXXX
LOAD DATA 5555
LOAD DATA 8080
LOAD DATA 5555
LOAD DATA 2020
ADDRESS 2AAA
ADDRESS 2AAA
ADDRESS 5555
ADDRESS 5555
ADDRESS 5555
ADDRESS 5555
TO
TO
TO
TO
TO
TO
TO
(1)
(4)
EXIT DATA
PROTECT STATE
(3)