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S-7760A53XX-HCT1 Datasheet(PDF) 22 Page - Seiko Instruments Inc |
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S-7760A53XX-HCT1 Datasheet(HTML) 22 Page - Seiko Instruments Inc |
22 / 53 page 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” “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” “L” “L” Figure 24 Data Transfer Timing |
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