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UPC1853 Datasheet(PDF) 18 Page - NEC |
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UPC1853 Datasheet(HTML) 18 Page - NEC |
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18 / 76 page  µPC1853 18 3.1.2 Stop condition Stop condition is made by rising of SDA from “Low” to “High” during SCL is “High” as shown in Fig. 3-2. When this stop condition is received, the µPC1853 stops to take in or output the data. Fig. 3-2 Start/Stop Condition of Data Transfer µs 4.0 MIN. µs 4.7 MIN. 3.5 V 1.5 V 3.5 V 1.5 V START SDA SCL STOP 3.1.3 Data transfer In the case of data transfer, data changing should be executed while SCL is “Low” like Fig. 3-3. When SCL is “High”, be sure not to change the data. Fig. 3-3 Data Transfer Note 1 Note 2 SDA SCL Note 1. Data hold time for I2C device: 300 ns MIN., Data hold time for CPU: 5 µs MIN. 2. Data set-up time: 250 ns MIN. Remark Clock frequency: 0 to 100 kHz 3.2 Data Transfer Format Fig. 3-4 is an example of data transfer in write mode. |
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