BU9890GUL-W Datasheet, PDF (12/14 Pages) Rohm – Silicon Monolithic Integrated Circuit

12/13
SDA
LINE
S
T
R
A
E
R
SLAVE
A
T
ADDRESS
D
101000 0
D7
DATA
S
T
O
P
D0
RA
A
/C
C
WK
K
Fig.-10 CURRENT READ CYCLE TIMING
○ In case that the previous operation is Random or Current Read (which includes Sequential Read
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).
○If an Acknowledge is detected, and no STOP condition is generated by the master (μ-COM),
the device will continue to transmit the data. ï¼»It can transmit all data (32kbit 4096word)ï¼½
○If an Acknowledge is not detected, the device will terminate further data transmissions
and await a STOP condition before returning to the standby mode.
NOTE) If an Acknowledge is detected with "Low" level, not "High" level, command will become
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.
SDA
LINE
S
W
S
T
R
T
R
S
A
R
T
SLAVE
ADDRESS
I
T
E
1st WORD
ADDRESS（ｎ）
2nd WORD
ADDRESS（ｎ）
A
R
T
SLAVE
ADDRESS
E
A
D
DATA(n)
T
O
P
1 0 10 0 00
WA
* * * * ₁₁
WA
0
1 0 1 0 A2A1A0
D7
D0
RA
A
A
RA
A
/C
C
C
/C
C
WK
K
K
WK
K
* : Don’t care
Fig.-11 RANDOM READ CYCLE TIMING
○Random Read operation allows the master to access any memory location indicated word
address.
○If an Acknowledge is detected, and no STOP condition is generated by the master (μ-COM),
the device will continue to transmit the data. ï¼»It can transmit all data (32kbit 4096word)ï¼½
○If an Acknowledge is not detected, the device will terminate further data transmissions
and await a STOP condition before returning to the standby mode.
NOTE) If an Acknowledge is detected with "Low" level, not "High" level, command will become
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.
REV. A