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BU2098F Datasheet(PDF) 6 Page - Rohm |
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BU2098F Datasheet(HTML) 6 Page - Rohm |
6 / 13 page BU2098F, BU2090F, BU2090FS Technical Note 6/12 www.rohm.com 2009.06 - Rev.A © 2009 ROHM Co., Ltd. All rights reserved. ● Function ○ Start condition The start condition is a “HIGH” to “LOW” transition of the SDA line while SCL is “HIGH”. ○ Stop condition The stop condition is a “LOW” to “HIGH” transition of the SDA line while SCL is “HIGH”. Fig.2 Start / Stop condition ○ Acknowledge The master (μp) puts a resistive “HIGH” level on the SDA line during the acknowledge clock pulse. The peripheral (audio processor) that acknowledge has to pull-down (“LOW”) the SDA line during the acknowledge clock pulse, so that the SDA line is stable “LOW” during this clock pulse. The slave which has been addressed has to generate an acknowledgement after the reception of each byte, otherwise the SDA line remains at the “HIGH” level during the ninth clock pulse time. In this case the master transmitter can generate the STOP information in order to abort the transfer. Fig.3 Acknowledge SDA SCL S Start condition P Stop condition 9 8 1 SCL (from master) SDA (from master) SDA (from slave) S not confirm ACK signal confirm clock for acknowledge |
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