AT29C257 View Datasheet(PDF) - Atmel Corporation
Part Name
Description
Manufacturer
AT29C257 Datasheet PDF : 12 Pages
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Software Data
Protection Enable Algorithm (1)
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA A0
TO
ADDRESS 5555
LOAD DATA
TO
(4)
PAGE (64 BYTES)
WRITES ENABLED
ENTER DATA
(2)
PROTECT STATE
Notes for software program code:
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. 64-bytes of data must be loaded.
Software Data
Protection Disable Algorithm (1)
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA 80
TO
ADDRESS 5555
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA 20
TO
ADDRESS 5555
LOAD DATA
TO
(4)
PAGE (64 BYTES)
EXIT DATA
(3)
PROTECT STATE
Software Protected Program Cycle Waveform (1, 2, 3)
Notes: 1. A6 through A14 must specify the page address
during each high to low transition of WE (or CE)
after the software code has been entered.
2. OE must be high when WE and CE are both low.
4-112
AT29C257
3. All bytes that are not loaded within the page being
programmed will be indeterminate.
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