| 摘要 |
In a serial communication system in which data is transmitted from a first unit to a second unit in synchronization with a clock signal, the mode of communication between the first and second units is switched between a first communication mode in which data is transmitted from the second unit to the first unit in synchronization with the clock signal, and a second communication mode in which a signal asynchronous to the clock signal is transmitted from the first unit to the second unit.
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