AT29C020-10PC ATMEL [ATMEL Corporation], AT29C020-10PC Datasheet - Page 11

• Manufacturer Part Number: AT29C020-10PC
• Description: 2-Megabit 256K x 8 5-volt Only CMOS Flash Memory
• Manufacturer: ATMEL [ATMEL Corporation]

20. Software Protected Program Cycle Waveform
Notes:
18. Software Data Protection
0291S–FLASH–11/08
Notes:
Enable Algorithm
1. A8 through A17 must specify the sector address during each high-to-low transition of WE (or CE) after the software code has
2. OE must be high when WE and CE are both low.
3. All bytes that are not loaded within the sector being programmed will be indeterminate.
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.
been entered.
SECTOR (256 BYTES)
ADDRESS 2AAA
LOAD DATA AA
ADDRESS 5555
LOAD DATA A0
ADDRESS 5555
LOAD DATA 55
LOAD DATA
TO
TO
TO
TO
(4)
(1)
WRITES ENABLED
ENTER DATA
PROTECT STATE
(2)
19. Software Data Protection
Disable Algorithm
(1)(2)(3)
SECTOR (256 BYTES)
ADDRESS 2AAA
ADDRESS 2AAA
LOAD DATA AA
ADDRESS 5555
ADDRESS 5555
LOAD DATA AA
ADDRESS 5555
ADDRESS 5555
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)
AT29C020
(3)
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