s-24c04c Seiko Instruments Inc., s-24c04c Datasheet - Page 16

• Manufacturer Part Number: s-24c04c
• Description: 2-wire Serial E2prom
• Manufacturer: Seiko Instruments Inc.

16
Acknowledge polling during write
Acknowledge polling during read
LINE
2-WIRE SERIAL E
S-24C04C
LINE
SDA
SDA
Remark
6. 4 Acknowledge polling
DATA
DATA
Acknowledge polling is used to know the completion of the write cycle in the S-24C04C.
After the S-24C04C receives a stop condition and once starts the write cycle, all operations are forbidden 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-24C04C 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-24C04C, namely to the slave devices.
That is, if the S-24C04C does not generate an acknowledge, the write cycle is in progress and if the S-24C04C
generates an acknowledge, 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.
O
O
S
T
P
S
T
P
2
PROM
S
A
R
S
A
R
T
T
T
T
ADDRESS
ADDRESS
DEVICE
DEVICE
Figure 17 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
ADDRESS
WORD
DATA
A
C
K
O
S
P
T
S
A
R
T
T
ADDRESS
DEVICE
Rev.2.0
W
R
/
_00_C
C
A
K