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AT34C02CN-SH-T Datasheet(PDF) 11 Page - ATMEL Corporation

Part # AT34C02CN-SH-T
Description  Two-wire Serial EEPROM with Permanent and Reversible Software Write Protect 2K (256 x 8)
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT34C02CN-SH-T Datasheet(HTML) 11 Page - ATMEL Corporation

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5185D–SEEPR–1/08
AT34C02C
Table 7-3.
WP Connected to GND or Floating
Table 7-4.
WP Connected to Vcc
WP Connected to GND or Floating
Command
R/W Bit
Permanent
Write Protect
Register
PSWP
Reversible
Write Protect
Register RSWP
Acknowledgme
nt from Device
Action from Device
1010
R
X
X
ACK
1010
W
Programmed
X
ACK
Can write to second Half (80H - FFH) only
1010
W
X
Programmed
ACK
Can write to second Half (80H - FFH) only
1010
W
Not Programmed
Not Programmed
ACK
Can write to full array
Read PSWP
R
Programmed
X
No ACK
STOP - Indicates permanent write protect register is
programmed
Read PSWP
R
Not Programmed
X
ACK
Read out data don't care. Indicates PSWP register
is not programmed
Set PSWP
W
Programmed
X
No ACK
STOP - Indicates permanent write protect register is
programmed
Set PSWP
W
Not Programmed
X
ACK
Program permanent write protect register
(irreversible)
Read RSWP
R
X
Programmed
No ACK
STOP - Indicates reversible write protect register is
programmed
Read RSWP
R
X
Not Programmed
ACK
Read out data don't care. Indicates RSWP register
is not programmed
Set RSWP
W
X
Programmed
No ACK
STOP - Indicates reversible write protect register is
programmed
Set RSWP
W
X
Not Programmed
ACK
Program reversible write protect register (reversible)
Clear RSWP
W
Programmed
X
No ACK
STOP - Indicates permanent write protect register is
programmed
Clear RSWP
W
Not Programmed
X
ACK
Clear (unprogram) reversible write protect register
(reversible)
WP Connected to Vcc
Comman
d
R/W Bit
Permanent
Write Protect
Register PSWP
Reversible
Write Protect
Register RSWP
Acknowledgme
nt from Device
Action from Device
1010
R
X
X
ACK
Read array
1010
W
X
X
ACK
Device Write Protect
Read
PSWP
R
Programmed
X
No ACK
STOP - Indicates permanent write protect register is
programmed
Read
PSWP
R
Not Programmed
X
ACK
Read out data don't care. Indicates PSWP register is
not programmed


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