Description: The P0 and P2 U1 port pin form part of the mouth 6 LED digital tube driver circuit, digital control with a total of positive type, use the PNP-type transistor as the driver chip select terminal, all the transistor emitter together, received positive supply-side, they were connected to the base P2.0 ... P2.5, P2.0 ... P2.5 when a pin in the output is low, the transistor turns on, to the corresponding digital control power supply, The digital tube lights which strokes will depend strokes pin is high or low.
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