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19. Software Data Protection
Enable Algorithm (1)
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA A0
TO
20. 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 XX
TO
ANY ADDRESS (4)
LOAD LAST BYTE
TO
LAST ADDRESS
WRITES ENABLED (2)
ENTER DATA
PROTECT STATE
ADDRESS 5555
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
Notes:
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.
LOAD DATA 20
TO
ADDRESS 5555
LOAD DATA XX
TO
ANY ADDRESS (4)
EXIT DATA
PROTECT STATE (3)
4. 1 to 128 bytes of data are loaded.
LOAD LAST BYTE
TO
LAST ADDRESS
21. Software Protected Write Cycle Waveforms (1)(2)(3)
Notes:
10
1. A0 through A14 must conform to the addressing sequence for the first 3 bytes as shown above.
2. After the command sequence has been issued and a page write operation follows, the page address inputs (A7 - A16) must
be the same for each high to low transition of WE (or CE).
3. OE must be high only when WE and CE are both low.
AT28C010
0353I–PEEPR–08/09
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