s-24c32c Seiko Instruments Inc., s-24c32c Datasheet - Page 16

• Manufacturer Part Number: s-24c32c
• Description: 2-wire Serial Eeprom S-24c32c/64c 32k/64k-bit
• Manufacturer: Seiko Instruments Inc.

16
Remark
Acknowledge polling during write
Acknowledge polling during read
LINE
2-WIRE CMOS SERIAL E
S-24C32C/64C
LINE
SDA
SDA
6. 4 Acknowledge Polling
DATA
DATA
Acknowledge polling is used to know the completion of the write cycle in the S-24C32C/64C.
After the S-24C32C/64C 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-24C32C/64C 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-24C32C/64C (slave device).
That is, if the S-24C32C/64C does not generate an acknowledgment signal, the write cycle is in progress and if
the S-24C32C/64C 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.
O
O
S
T
P
S
T
P
S
A
R
S
A
R
T
T
T
T
ADDRESS
ADDRESS
DEVICE
DEVICE
Figure 17 Usage Example of Acknowledge Polling
2
PROM
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_H
C
A
K