BR34L02-W 데이터 시트보기 (PDF) - ROHM Semiconductor
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BR34L02-W Datasheet PDF : 17 Pages
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○WRITE PROTECT COMMAND
Write Protect Command is to cancel any write command which access to the address00～7Fh.
Write Protect Register can be written for once (Onetime Rom).
Once this command is excuted, the data is protected forever.
○WRITE PROTECT PIN(WP)
When WP pin set to Vcc (H level), write protect is set for 256 words (all address). When WP pin set to GND (L level),
it is enable to write 256 words (all address).
If permanent protection is done by Write Protect command, lower half area (00～7Fh address) is inhibited writing
regardless of WP pin state.
WP pin has a Pull-Down resistor. Please be left unconnected or connect to GND when WP feature is not in use.
●COMMAND
○WRITE CYCLE
With WRITE CYCLE operation, the given data is written in the EEPROM. BYTE WRITE CYCLE is usually used to write
only one byte, but in case of writing continuous data more than one byte, it is possible with PAGE WRITE. The maximum
bytes written at once is up to 16 bytes.
SDA
LINE
S
W
T
R
A
I
R
SLAVE T
T
ADDRESS E
WORD
ADDRESS
S
T
DATA
O
P
1 0 1 0 A2 A1 A0
WA
7
WA
0
D7
D0
RA
A
A
/C
C
C
WK
K
K
Fig.34 BYTE WRITE CYCLE TIMING
SDA
L IN E
S
W
T
R
A
I
R
SLAVE
T
T ADDRESS E
W ORD
ADDRESS(n)
DATA(n)
1 0 1 0 A 2A 1A 0
WA
7
WA
0
D7
D0
RA
A
A
/C
C
C
WK
K
K
Fig.35 PAGE WRITE CYCLE TIMING
S
T
O
D A T A (n + 1 5 )
P
D0
A
C
K
・By using this command, the data is programmed into the indicated word address.
・When the master generates a STOP condition, the device begins the internal write cycle to the nonvolatile memory
array.
・This device is capable of sixteen byte Page Write operation.
・Once the programming is started, any commands isn’t accept for tWR (5ms max.).
・If the master transmits more than sixteen words, prior to generating the STOP condition, the address counter will “roll
over,” and the previous transmitted data will be overwritten.
・When two or more byte data are inputted, the four low order address bits are internally incremented by one after the
receipt of each word. The four higher order bits of the address(WA7～WA4) remain constant.
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