Processor pin multiplexing circuit and electric appliance

The invention relates to a processor pin multiplexing circuit and an electric appliance. In the processor pin multiplexing circuit, an acquisition pin of a processor MCU (Microprogrammed Control Unit) is connected with an output end of a functional circuit; an acquisition pin of the processor MCU is connected with a first end of the resistor R1, and a second end of the resistor R1 is connected with a power supply end VCC; an acquisition pin of the processor MCU is connected with a first end of the capacitor C, and a second end of the capacitor C is grounded; the acquisition pin of the processor MCU is connected with the first end of the switch K. The second end of the switch K is grounded. When the switch K is switched off, the processor MCU acquires an output signal of the functional circuit; when the processor MCU can collect the output signal of the functional circuit, the switch K is switched off; when the switch K is closed, the acquisition pin of the processor MCU is grounded; when the acquisition pin o