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BR34E02FVT-W, BR34E02NUX-W
○ Write Protect Cycle
Technical Note
S
W
T
R
S
SDA
L IN E
WP
A
R
T
SLAVE
ADDRESS
0 1 1 0 A 2 A 1 A 0
I
T
E
R A
/ C
W K
*
W ORD
ADDRESS
*
A
C
K
*
D ATA
*
A
C
K
T
O
P
*:D O N ’T C A R E
Fig. 38 Permanent Write Protect Cycle
? Permanent set Write Protect command set data of 00h ～ 7Fh in 256 words write protection block. Clear Write Protect
command can cancel write protection block which is set by set write Protect command. Cancel of write protection block
which is set by permanent set Write Protect command at once is impossibility. When these commands are carried out,
WP pin must be OPEN or GND.
? Permanent Set Write Protect command needs tWR from stop condition same as Byete Write and Page Write, During
tWR, input command is canceled.
? Refer to P8/19 about reply of ACK in each protect state.
S
W
T
R
S
A
R
T
SLAVE
ADDRESS
I
T
E
W ORD
ADDRESS
D ATA
T
O
P
SDA
L IN E
WP
0 1 1 0 0 0 1
R A
/ C
W K
*
*
A
C
K
*
*
A
C
K
*:D O N ’T C A R E
Fig. 39 Set Write Protect Cycle
? Permanent set Write Protect command set data of 00h ～ 7Fh in 256 words write protection block. Clear Write Protect
command can cancel write protection block which is set by set write Protect command. Cancel of write protection block
which is set by permanent set Write Protect command at once is impossibility. When these commands are carried out,
WP pin must be OPEN or GND.
? Permanent Set Protect command needs tWR from stop condition same as Byete Write and Page Write, During tWR,
input command is canceled.
? Refer to P8/19 about reply of ACk in each protect state.
S
W
T
R
S
A
R
T
SLAVE
ADDRESS
I
T
E
W ORD
ADDRESS
D ATA
T
O
P
SDA
L IN E
WP
0 1 1 0 0 1 1
R A
/ C
W K
*
*
A
C
K
*
*
A
C
K
*:D O N ’T C A R E
Fig. 40 Clear Write Protect Cycle
? Clear Write Protect command can cancel write protection block which is set by set write Protect command. Cancel of
write protection block which is set by permanent set Write Protect command at once is impossibility. When these
commands are carried out, WP pin must be OPEN or GND.
? Permanent Clear Write Protect command needs tWR from stop condition same as Byete Write and Page Write, During
tWR, input command is canceled.
? Refer to P8/19 about reply of ACk in each protect state.
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? 2009 ROHM Co., Ltd. All rights reserved.
10/18
2009.09 - Rev.B
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