BU9889GUL-W Rohm, BU9889GUL-W Datasheet - Page 8

• Manufacturer Part Number: BU9889GUL-W
• Description: WL-CSP EEPROM family I2C BUS
• Manufacturer: Rohm

●Write Command
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BU9889GUL-W
www.rohm.com
SDA
LINE
○Write cycle
・Arbitrary data is written to EEPROM. When to write only 1 byte, byte write normally used, and when to write continuous
・Data is written to the address designated by word address (n-th address).
・By issuing stop bit after 8bit data input, write to memory cell inside starts.
・When internal write is started, command is not accepted for tWR (5ms at maximum).
・By page write cycle, the following can be written in bulk: Up to 16 bytes
・As for page write command, after page select bit(PS) of slave address is designated arbitrarily, by continuing data input of
○Notes on write cycle continuous input
data of 2 bytes or more, simultaneous write is possible by page write cycle.
And when data of the maximum bytes or higher is sent, data from the first byte is overwritten.
(Refer to "Internal address increment of "Notes on page write cycle" in P9/17.)
2 bytes or more, the address of insignificant 4 bits is incremented internally, and data up to 16 bytes can be written.
SDA
LINE
S D A
L IN E
S
T
A
R
T
1 0
S
T
A
R
T
R
S
T
A
T
ADDRESS
1
1 0
SL AVE
Fig.32 Byte write cycle
Fig.33 Page write cycle
1
0
A D D R E S S
0
1
ADDRESS
S L A V E
1
A2
SLAVE
0
0
注 )
P1
A2
A 2
P0
P1
P1 P0
A 1
R
W
/
P0
A 0
Fig.34 Page write cycle
W
R
T
E
I
A
C
K
R
W
W
W
R
R
T
E
/
/
I
W
R
E
T
I
WA
A
C
K
7
A
C
K
ADDRESS（ｎ）
W A
WA
*1
7
7
WORD
A D D R E S S (n )
ADDRESS
W O R D
WORD
WA
0
W A
0
WA
0
A
C
K
A
C
K
D7
A
C
K
D 7
D7
DATA(n)
D A TA (n )
DATA
D0
D 0
D0
A
C
K
C
A
K
8/17
C
A
K
S
T
O
P
DATA(n+15)
D A TA (n +1 5 )
D 0
*2
D0
A
C
K
A
C
K
O
S
T
P
O
P
S
T
At STOP (s top bit )
write starts.
tW R(maximum： 5ms)
Command is not accepted for this
period.
Next command
S
T
A
R
T
1
0
1
0
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2010.01 - Rev.A
Technical Note