s-24c08ci-t8t1u3 Seiko Instruments Inc., s-24c08ci-t8t1u3 Datasheet - Page 17

• Manufacturer Part Number: s-24c08ci-t8t1u3
• Description: 2-wire Serial Eeprom S-24c08c 8k-bit
• Manufacturer: Seiko Instruments Inc.

Remark
Acknowledge polling during write
Acknowledge polling during read
LINE
Rev.2.0
LINE
SDA
SDA
6. 4 Acknowledge Polling
DATA
DATA
Acknowledge polling is used to know the completion of the write cycle in the S-24C08C.
After the S-24C08C receives a stop condition and once starts the write cycle, all operations are inhibited and no
response is made to the signal transmitted by the master device.
Accordingly the master device can recognize the completion of the write cycle in the S-24C08C by detecting a
response from the slave device after transmitting the start condition, the device address and the read / write
instruction code to the S-24C08C (slave device).
That is, if the S-24C08C does not generate an acknowledgment signal, the write cycle is in progress and if the S-
24C08C generates an acknowledgment signal, the write cycle has been completed.
It is recommended to use the read instruction “1” as the read / write instruction code transmitted by the master
device.
D2 D1 D0
D2 D1 D0
Users are able to input word address and data after ACK output in acknowledge polling during write.
Users are able to read data after ACK output in acknowledge polling during read. However, after that users input
the write instruction, a start condition may not be input during data output. Input a stop condition and the next
instruction after data output and ACK output.
_00_H
O
O
S
T
P
S
T
P
S
A
R
S
A
R
T
T
T
T
ADDRESS
ADDRESS
DEVICE
DEVICE
Figure 18 Usage Example of Acknowledge Polling
t
t
WR
WR
W
W
W
R
R
R
R
D
T
E
E
A
0
/
1
/
I
N
A
C
K
N
A
C
K
Seiko Instruments Inc.
S
A
R
T
T
S
T
A
R
T
ADDRESS
ADDRESS
DEVICE
DEVICE
W
W
R
W
R
E
R
T
0
/
R
E
A
D
1
I
/
C
A
K
A
C
K
NO ACK from
Master Device
2-WIRE CMOS SERIAL E
ADDRESS
WORD
DATA
A
C
K
O
S
P
T
S
A
R
T
T
ADDRESS
DEVICE
S-24C08C
2
PROM
W
R
/
C
A
K
17