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S7760A Datasheet(PDF) 23 Page - Seiko Instruments Inc

Part # S7760A
Description  PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E2PROM CIRCUIT)
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Manufacturer  SII [Seiko Instruments Inc]
Direct Link  http://www.sii.co.jp
Logo SII - Seiko Instruments Inc

S7760A Datasheet(HTML) 23 Page - Seiko Instruments Inc

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PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E2PROM CIRCUIT)
Rev.2.0_01
S-7760A
23
4. Acknowledgment
Data is transmitted sequentially in 8-bit. Changing the SDA line to “L” indicates that the devices on the system bus
have received data, thus the devices send an acknowledgment signal back during the 9th clock of cycle.
The S-7760A does not send an acknowledgment signal back during the Write operation.
1
8
9
Acknowledgment
signal output
Start
Condition
SCL
Input
SDA
(Master device
’s
output)
SDA
Output
Figure 25 Acknowledgment Output Timing
5. Read operation
When this IC receives the 7-bit device address and the Read/Write instruction code “1” after receiving a start condition,
it generates an acknowledgment signal.
Next, data with 8-bit length is output from this IC synchronizing with the SCL clock.
After that, the master device sends a stop condition, not an acknowledgment signal in order to finish the Read
operation.
S
T
A
R
T
R
E
A
D
S
T
O
P
DEVICE
ADDRESS
R
/
W
M
S
B
SDA LINE
C2 C1 C0
B7 B6 B5 B4 B3 B2 B1 B0
A
C
K
L
S
B
1
DATA
NO ACK from
Master Device
D
C
0
C3
D
C
1
D
C
2
Figure 26 Read


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