一个七段解码器模块，c2～c0是解码器的3个输入，当输入值不同时，输出不同的字符。如表中所示，当输入值为100～111时，输出空格，即数码管全暗。七段数码管的不同段位用数字0～6表示，注意七段数码管是共阳极的，即各管段输入低电平时，数码管亮；否则数码管暗。 -A seven-segment decoder module, c2 ~ c0 is a 3 input decoder, when the input value is not the same time, the output of different characters. As the table shows, when the input is 100 to 111, the output space, that is, the digital control and dark. Dan seven-segment digital tube with different numbers 0 to 6, said attention is the common anode seven-segment digital tube, that the pipe input low, the digital tube light　or digital control dark.