| 摘要 |
PROBLEM TO BE SOLVED: To decrease the number of signal lines required for data communication. SOLUTION: In the case of transmitting interphone serial data C from a transmitter side 1 to a receiver side 2 by using a communication enable signal A and a communication clock signal B, the transmitter side transmits the communication enable signal and the communication clock signal at different levels on the same line, and the receiver side discriminates the communication enable signal and the communication clock signal at different threshold levels Ea, Eb respectively and receives the discriminated signals.
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