| 摘要 |
A master communication circuit, a slave communication circuit, and a data communication method are provided to transceive data even when the number of terminals needed for communication is small and precision of a clock is low. A timer circuit(25) detects a first time. A first output circuit enables the timer circuit to start a detecting operation and outputs a first output signal of one-side logical level for starting the detecting operation for a second time longer than the first time of the slave communication circuit(2) if a value transmitted to the slave communication circuit is one-side logical level. A second output circuit outputs a second output signal of another logical level if the timer circuit detects the first time. A value of one-side logical level is transmitted to the slave communication circuit by preventing the slave communication circuit from detecting the second time, enabling the timer circuit to detect the first time, and enabling the second output circuit to output the second output signal.
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