S-7760A53XX-HCT1 datasheet(22/53 Pages) SII

Part #	S-7760A53XX-HCT1

Description	PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E2PROM CIRCUIT)

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Manufacturer	SII [Seiko Instruments Inc]

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PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E2PROM CIRCUIT)

S-7760A

Rev.1.3_00

Seiko Instruments Inc.

22

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 I

2C-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 I

2C-bus interface.

Start Condition

SCL

SDA

“H”

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

SDA

“L”

Figure 24 Data Transfer Timing

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