BU99901GUZ-W ROHM Co. Ltd., BU99901GUZ-W Datasheet - Page 10

• Manufacturer Part Number: BU99901GUZ-W
• Description: 4k?8 Bit Electrically Erasable Prom
• Manufacturer: ROHM Co. Ltd.

SDA
LINE
WP
NOTE) If an Acknowledge is detected with "Low" level, not "High" level, command will become
○ In case that the previous operation is Random or Current Read (which includes Sequential Read
○If an Acknowledge is detected, and no STOP condition is generated by the master (μ-COM),
○If an Acknowledge is not detected, the device will terminate further data transmissions
○This device is capable of thirty-two byte Page Write operation.
○When two or more byte data are inputted, the five low order address(WA4～WA0) bits are in
respectively), the internal address counter is increased by one from the last accessed address
(n). Thus Current Read outputs the data of the next word address (n+1).
If the last command is Byte or Page Write, the internal address counter stays at the last address (n).
Thus Current Read outputs the data of the word address (n).
and await a STOP condition before returning to the standby mode.
A
R
S
T
T
the device will continue to transmit the data. ［It can transmit all data (32kbit 4096word)］
ternally incremented by one after the receipt of each word. The seven higher order bits of
the address(WA4～WA0) remain constant.
1 0
ADDRESS
Sequential Read. So the device transmits the next data, Read is not terminated. In the
case of terminating Read, input Acknowledge with "High" always, then input stop condition.
SLAVE
SDA
LINE
1
0
0
0
0
W
R
/
W
R
T
S
T
A
R
T
E
I
A
C
K
1
* * *
ADDRESS（ｎ）
0
1st WORD
ADDRESS
1
SLAVE
*
WA
11
0
Fig.-9 PAGE WRITE CYCLE TIMING
0
0
A
C
K
0
W
R
/
ADDRESS（ｎ）
R
E
A
D
2nd WORD
A
C
K
D7
REV. A
WA
0
A
C
K
DATA
D7
DATA(n)
D0
D0
A
C
K
C
A
K
O
S
T
P
DATA(n+31)
* : Don’t care
D0
A
C
K
O
S
T
P
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