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AT34C02B
Table 6. Write Protection
Pin
Preamble
RW
Command
Set PSWP
Set RSWP
Clear RSWP
A2
A2
0
0
A1
A1
0
1
A0
A0
VHV
VHV
B7
0
0
0
B6
1
1
1
B5
1
1
1
B4
0
0
0
B3
A2
0
0
B2
A1
0
1
B1
A0
1
1
B0
0
0
0
Table 7. VHV
Min
Max
Units
VHV
Note:
VHV - VCC > 4.8V
7
10
V
Table 8. WP Connected to GND or Floating
WP Connected to GND or Floating
Permanent Write
Reversible Write
Protect Register
Protect Register
Acknowledgment
Command
1010
1010
1010
1010
Read PSWP
Read PSWP
Set PSWP
Set PSWP
Read RSWP
Read RSWP
Set RSWP
Set RSWP
Clear RSWP
Clear RSWP
R/W Bit
R
W
W
W
R
R
W
W
R
R
W
W
W
W
PSWP
X
Programmed
X
Not Programmed
Programmed
Not Programmed
Programmed
Not Programmed
X
X
X
X
Programmed
Not Programmed
RSWP
X
X
Programmed
Not Programmed
X
X
X
X
Programmed
Not Programmed
Programmed
Not Programmed
X
X
from Device
ACK
ACK
ACK
ACK
No ACK
ACK
No ACK
ACK
No ACK
ACK
No ACK
ACK
No ACK
ACK
Action from Device
Can write to second Half (80H - FFH) only
Can write to second Half (80H - FFH) only
Can write to full array
STOP - Indicates permanent write protect register is
programmed
Read out data don't care. Indicates PSWP register
is not programmed
STOP - Indicates permanent write protect register is
programmed
Program permanent write protect register
(irreversible)
STOP - Indicates reversible write protect register is
programmed
Read out data don't care. Indicates RSWP register
is not programmed
STOP - Indicates reversible write protect register is
programmed
Program reversible write protect register (reversible)
STOP - Indicates permanent write protect register is
programmed
Clear (unprogram) reversible write protect register
(reversible)
11
3417E–SEEPR–1/07
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