AT28HC64B-90 Ver la hoja de datos (PDF) - Atmel Corporation

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AT28HC64B-90

64K 8K x 8 High Speed CMOS E2PROM with Page Write and Software Data Protection

Atmel Corporation 

Software Data

Protection Enable Algorithm (1)

LOAD DATA AA

TO

ADDRESS 1555

LOAD DATA 55

TO

ADDRESS 0AAA

LOAD DATA A0

TO

ADDRESS 1555

LOAD DATA XX

TO

ANY ADDRESS (4)

WRITES ENABLED (2)

LOAD LAST BYTE

TO

LAST ADDRESS

ENTER DATA

PROTECT STATE

Notes for software program code:

1. Data Format: I/O7 - I/O0 (Hex);

Address Format: A12 - 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 1555

LOAD DATA 55

TO

ADDRESS 0AAA

LOAD DATA 80

TO

ADDRESS 1555

LOAD DATA AA

TO

ADDRESS 1555

LOAD DATA 55

TO

ADDRESS 0AAA

LOAD DATA 20

TO

ADDRESS 1555

LOAD DATA XX

TO

ANY ADDRESS (4)

EXIT DATA

PROTECT STATE (3)

LOAD LAST BYTE

TO

LAST ADDRESS

Software Protected Write Cycle Waveforms (1, 2)

Notes: 1. A6 through A12 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.

2-274

AT28HC64B

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