Software Protected Program Cycle Waveform

(1, 2, 3)

Notes: 1. A7 through A16 must specify the sector 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.

3. All bytes that are not loaded within the sector being

programmed will be indeterminate.

LOAD DATA

TO

SECTOR (128 BYTES)

(4)

LOAD DATA A0

TO

ADDRESS 5555

LOAD DATA 55

TO

ADDRESS 2AAA

LOAD DATA AA

TO

ADDRESS 5555

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.

ENTER DATA

PROTECT STATE

(2)

WRITES ENABLED

Software Data

Protection Enable Algorithm

(1)

LOAD DATA

TO

SECTOR (128 BYTES)

(4)

LOAD DATA 55

TO

ADDRESS 2AAA

LOAD DATA AA

TO

ADDRESS 5555

LOAD DATA 80

TO

ADDRESS 5555

LOAD DATA 55

TO

ADDRESS 2AAA

LOAD DATA AA

TO

ADDRESS 5555

LOAD DATA 20

TO

ADDRESS 5555

EXIT DATA

PROTECT STATE

(3)

Software Data

Protection Disable Algorithm

(1)

4-136

AT29C010A