10

0353G–PEEPR–10/06

AT28C010

19. Software Data Protection

Enable Algorithm

(1)

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.

4. 1 to 128 bytes of data are loaded.

LOAD DATA AA

TO

ADDRESS 5555

LOAD DATA 55

TO

ADDRESS 2AAA

LOAD DATA A0

TO

ADDRESS 5555

LOAD DATA XX

TO

LOAD LAST BYTE

TO

LAST ADDRESS

ENTER DATA

PROTECT STATE

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 AA

TO

ADDRESS 5555

LOAD DATA 20

TO

ADDRESS 5555

LOAD DATA XX

TO

LOAD LAST BYTE

TO

LAST ADDRESS

LOAD DATA 55

TO

ADDRESS 2AAA

EXIT DATA

21. Software Protected Write Cycle Waveforms(1)(2)(3)

Notes:

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.