AT29C020-15 ATMEL Corporation, AT29C020-15 Datasheet - Page 8

• Manufacturer Part Number: AT29C020-15
• Description: 2-Megabit 256K x 8 5-volt Only CMOS Flash Memory
• Manufacturer: ATMEL Corporation

Software Protected Program Cycle Waveform
Software Data
Protection Enable Algorithm
Notes for software program code:
1. Data Format: I/O7 - I/O0 (Hex);
2. Data Protect state will be activated at end of program cycle.
3. Data Protect state will be deactivated at end of program
4. 256-bytes of data
8
Notes: 1. A8 through A17 must specify the sector address
Address Format: A14 - A0 (Hex).
period.
2. OE must be high when WE and CE are both low.
during each high to low transition of WE (or CE)
after the software code has been entered.
SECTOR (256 BYTES)
ADDRESS 2AAA
LOAD DATA AA
ADDRESS 5555
ADDRESS 5555
LOAD DATA A0
LOAD DATA 55
LOAD DATA
MUST BE
TO
TO
TO
TO
AT29C020
loaded.
(4)
WRITES ENABLED
ENTER DATA
PROTECT STATE
(1)
(2)
3. All bytes that are not loaded within the sector being
Software Data
Protection Disable Algorithm
programmed will be indeterminate.
(1, 2, 3)
SECTOR (256 BYTES)
ADDRESS 2AAA
ADDRESS 2AAA
ADDRESS 5555
ADDRESS 5555
ADDRESS 5555
ADDRESS 5555
LOAD DATA AA
LOAD DATA AA
LOAD DATA 55
LOAD DATA 80
LOAD DATA 55
LOAD DATA 20
LOAD DATA
TO
TO
TO
TO
TO
TO
TO
(4)
EXIT DATA
PROTECT STATE
(1)
(3)