BU99901GUZ-W Datasheet, PDF (11/12 Pages) Rohm – Silicon Monolithic Integrated Circuit

11/11
SDA
LINE
S
W
T
R
A
R
T
SLAVE
ADDRESS
I
T
E
1st WORD
ADDRESS（ｎ）
1 0 10 0 00
WA
* * * * ₁₁
S
T
R
S
2nd WORD
ADDRESS（ｎ）
A
R
T
SLAVE
ADDRESS
E
A
D
DATA(n)
T
O
P
WA
0
1 0 1 0 A2A1A0
D7
D0
RA
A
A
RA
/C
C
C
/C
WK
K
K
WK
Fig.-10 CURRENT READ CYCLE TIMING
A
C
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.
S
T
A
R
T
SLAVE
ADDRESS
R
E
A
D
DATA(n)
SDA
LINE
1010000
D7
D0
RA
A
/C
C
WK
K
S
T
DATA(n+x)
O
P
D7
D0
A
A
C
C
K
K
Fig.-12 SEQUENTIAL READ CYCLE TIMING
（ Current Read ）
○○If an Acknowledge is detected, and no STOP condition is generated by the master (μ-CO
M), 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.
○The Sequential Read operation can be performed with both Current Read and Random Read.
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