28C256 查看數據表（PDF） - Atmel Corporation
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28C256 Datasheet PDF : 14 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 XX
TO
ANY ADDRESS (4)
LOAD LAST BYTE
TO
LAST ADDRESS
WRITES ENABLED (2)
ENTER DATA
PROTECT STATE
Notes for software program code:
1. Data Format: I/O7 - I/O0 (Hex);
Address Format: A14 - A0 (Hex).
2. Write Protect state will be activated at end of write even if no
other data is loaded.
3. Write Protect state will be deactivated at end of write period
even if no other data is loaded.
4. 1 to 64-bytes of data are 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 XX
TO
ANY ADDRESS (4)
LOAD LAST BYTE
TO
LAST ADDRESS
EXIT DATA
PROTECT STATE (3)
Software Protected Write Cycle Waveforms (1, 2)
Notes: 1. A6 through A14 must specify the same page address during each high to low transition of WE (or CE) after
the software code has been entered.
2. OE must be high only when WE and CE are both low.
2-224
AT28C256
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