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Microcontroller (also DSP, microprocessor controller) via 4-wire serial interface or 2-wire serial interface control chip CH452, CH452's digital display between the drive and the keyboard scan control independent of each other, the microcontroller can operate command are open, close, set the two functions. CH452 4-wire serial interface is implemented by hardware, the microcontroller through the serial interface can be frequent high-speed operation, and will not reduce the efficiency of CH452; but 2-wire serial interface is shared by the software and hardware implementation, it is not suitable for frequent operation uninterrupted.