文件名称:screen
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U1的 P0 口和 P2 口的部份引脚构成了 6位 LED数码
管驱动电路，数码管采用共阳型，使用 PNP 型三极管作为片选端的驱动，所有三极管的发
射极连在一起，接到正电源端，它们的基极则分别连到 P2.0…P2.5，当P2.0…P2.5 中某引脚
输是低电平时，三极管导通，给相应的数码管供电，该位数码管点亮哪些笔段，则取决于笔
段引脚是高或低电平。-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.
管驱动电路，数码管采用共阳型，使用 PNP 型三极管作为片选端的驱动，所有三极管的发
射极连在一起，接到正电源端，它们的基极则分别连到 P2.0…P2.5，当P2.0…P2.5 中某引脚
输是低电平时，三极管导通，给相应的数码管供电，该位数码管点亮哪些笔段，则取决于笔
段引脚是高或低电平。-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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screen.txt
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