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S-7750C Datasheet, PDF (19/44 Pages) Seiko Instruments Inc – PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E2PROM CIRCUIT) | |||
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PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E2PROM CIRCUIT)
Rev.1.1_00
S-7750C
 Operation
1. Start condition
A start condition starts by changing the SDA line from âHâ to âLâ while the SCL line is âHâ. Input a start condition first
when inputting a command via I2C-bus interface.
2. Stop condition
A stop condition starts by changing the SDA line from âLâ to âHâ while the SCL line is âHâ. Input a stop condition in the
end when inputting a command via I2C-bus interface.
âHâ
âHâ
SCL
SDA
Start Condition
Stop Condition
Figure 23 Start / Stop Condition
3. Data transfer
The S-7750C loads data in the SDA line at a rising edge of the SCL line.
Change the SDA line while the SCL line is âLâ during the data transmission.
If changing the SDA line while the SCL line is âHâ, the S-7750C goes in the start or stop condition status.
SCL
âLâ
âLâ
âLâ
SDA
Figure 24 Data Transfer Timing
Seiko Instruments Inc.
19
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