S-7760A Datasheet, PDF (22/53 Pages) Seiko Instruments Inc – PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E2PROM CIRCUIT)

PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E²PROM CIRCUIT)
S-7760A
Rev.1.3_00
„ Operation
1. Start condition
A start condition starts by changing the SDA line from “H” to “L” while the SCL line is “H”. 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 “L” to “H” while the SCL line is “H”. Input a stop condition in the
end when inputting a command via I²C-bus interface.
“H”
“H”
SCL
SDA
Start Condition
Stop Condition
Figure 23 Start / Stop Condition
3. Data transfer
The S-7760 installs data in the SDA line at a rising edge of the SCL line.
Change the SDA line while the SCL line is “L” during the data transmission.
If changing the SDA line while the SCL line is “H”, the S-7760A goes in the start or stop condition status.
SCL
“L”
“L”
“L”
SDA
Figure 24 Data Transfer Timing
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Seiko Instruments Inc.