AT29C256-15 ATMEL [ATMEL Corporation], AT29C256-15 Datasheet - Page 10

• Manufacturer Part Number: AT29C256-15
• Description: 256K 32K x 8 5-volt Only CMOS Flash Memory
• Manufacturer: ATMEL [ATMEL Corporation]

Software Data Protection
Enable Algorithm
Notes:
Software Protected Program Cycle Waveform
Notes:
10
1. Data Format: I/O7 - I/O0 (Hex);
2. Data Protect state will be re-activated at end of pro-
3. Data Protect state will be deactivated at end of pro-
4. 64 bytes of data MUST BE loaded.
1. A6 through A14 must specify the page 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 page being programmed will be indeterminate.
AT29C256
Address Format: A14 - A0 (Hex).
gram cycle.
gram period.
been entered.
PAGE (64 BYTES)
ADDRESS 2AAA
LOAD DATA AA
ADDRESS 5555
ADDRESS 5555
LOAD DATA 55
LOAD DATA A0
LOAD DATA
TO
TO
TO
TO
(1)
(4)
WRITES ENABLED
ENTER DATA
PROTECT STATE
(2)
Software Data Protection
Disable Algorithm
(1)(2)(3)
PAGE (64 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)
(1)
EXIT DATA
PROTECT STATE
0046P–FLASH–10/04
(3)