AT28C64B-15 Ver la hoja de datos (PDF) - Atmel Corporation

Número de pieza

componentes Descripción

Fabricante

AT28C64B-15

64K (8K x 8) CMOS E2PROM with Page Write and Software Data Protection

Atmel Corporation 

19. Software Data Protection Enable

Algorithm(1)

LOAD DATA AA

TO

ADDRESS 1555

20. Software Data Protection Disable

Algorithm(1)

LOAD DATA AA

TO

ADDRESS 1555

LOAD DATA 55

TO

ADDRESS 0AAA

LOAD DATA 55

TO

ADDRESS 0AAA

LOAD DATA A0

TO

ADDRESS 1555

WRITES ENABLED(2)

LOAD DATA XX

TO

ANY ADDRESS(4)

LOAD DATA 80

TO

ADDRESS 1555

LOAD DATA AA

TO

ADDRESS 1555

LOAD LAST BYTE

TO

LAST ADDRESS

ENTER DATA

PROTECT STATE

Notes:

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.

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

Notes:

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.

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

OE

CE

tWPH

tBLC

tWP

WE

tAS

tAH

tDH

A0 -A5

A6 - A12

tDS

DATA

tWC

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.

10 AT28C64B

0270L–PEEPR–2/09

Share Link: