BR34E02FVT-3 Ver la hoja de datos (PDF) - ROHM Semiconductor
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BR34E02FVT-3 Datasheet PDF : 20 Pages
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BR34E02FVT-3,BR34E02NUX-3
●Write Protect Cycle
SDA
L IN E
WP
S
W
T
R
A
R
T
I
SLAVE
T
ADDRESS E
W ORD
ADDRESS
0 1 1 0 A 2A 1A 0
*
**
DATA
S
T
O
P
*
RA
A
/C
C
WK
K
Fig. 38 Permanent Set Write Protect Cycle
A
C
K
*:DO N’T CARE
Technical Note
・Permanent set Write Protect command set data of 00h～7Fh in 256 words write protection block. 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 Byte Write and Page Write, During tWR,
input command is canceled.
・Refer to P8 about reply of ACK in each protect state.
S
W
T
R
A
R
T
SLAVE
ADDRESS
I
T
E
W ORD
ADDRESS
SDA
L IN E
011 0 001
*
**
RA
A
/C
C
WP
WK
K
Fig. 39 Set Write Protect Cycle
DATA
S
T
O
P
*
A
C
K
*:DO N’T CARE
・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. When these commands are carried out, WP
pin must be OPEN or GND.
・Set write Protect command needs tWR from stop condition same as Byte Write and Page Write, During tWR, input
command is canceled.
・Refer to P8 about reply of ACK in each protect state.
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11/19
2011.11 - Rev.A
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