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BU99901GUZ-W (32Kbit)
Datasheet
● Read Command
○ Read cycle
Data of EEPROM is read. In read cycle, there are random read cycle and current read cycle.
Random read cycle is a command to read data by designating address, and is used generally.
Current read cycle is a command to read data of internal address register without designating address, and is used when
to verify just after write cycle. In both the read cycles, sequential read cycle is available, and the next address data can
be read in succession.
SDA
LINE
S
T
A
R
T
SLAVE
ADDRESS
1 0
1 0 0 0 0
W
R
I
T
E
1st WORD
ADDRESS(n)
＊ ＊ ＊ ＊ WA
11
2nd WORD
ADDRESS(n)
WA
0
S
T
A
R
T
SLAVE
ADDRESS
1 0
1 0 A 2 A1 A0
R
E
A
D
D7
DATA(n)
D0
S
T
O
P
It is necessary to input 'H'
to the last ACK.
R A
/ C
W K
A
C
K
A
C
K
R A
/ C
W K
A
C
K
Figure 36. Random read cycle
S
T
A
R
T
S LA V E
ADDRESS
R
E
A
D
D A TA (n )
S
T
O
P
It is necessary to input 'H'
to the last ACK.
SDA
L IN E
1 0 1 0 0 0 0
R A
/ C
W K
D7
D0
A
C
K
Figure 37. Current read cycle
S
T
A
R
T
SLAVE
ADDRESS
R
E
A
D
DATA(n)
DATA(n+x)
S
T
O
P
SDA
LINE
1 0 1 0 0 0 0
R A
/ C
W K
D7
D0
A
C
K
A
C
K
D7
D0
A
C
K
Figure 38. Sequential read cycle (in the case of current read cycle)
? In random read cycle, data of designated word address can be read.
? When the command just before current read cycle is random read cycle, current read cycle (each including sequential
read cycle), data of incremented last read address (n)-th address, i.e., data of the (n+1)-th address is output.
? When ACK signal 'LOW' after D0 is detected, and stop condition is not sent from master (μ-COM) side, the next
address data can be read in succession.
? Read cycle is ended by stop condition where 'H' is input to ACK signal after D0 and SDA signal is started at SCL
signal 'H'.
? When 'H' is not input to ACK signal after D0, sequential read gets in, and the next data is output.
Therefore, read command cycle cannot be ended. When to end read command cycle, be sure input stop condition to
input 'H' to ACK signal after D0, and to start SDA at SCL signal 'H'.
? Sequential read is ended by stop condition where 'H' is input to ACK signal after arbitrary D0 and SDA is started at SCL
signal 'H'.
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
16/23
TSZ02201-0R2R0G100280-1-2
4.SEP.2012 Rev.001
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