说明：  通过编码开关（旋转编码器）控制数码管的加减一！程序详细的体现了编码器的编程和数码管的单片机的编程！本程序通过AT89C51和24脉冲编码器的测试
(Through coding switch (rotary encoder) control the digital control of plus or minus 1! Procedures in detail the programming reflects the encoder and digital control of the microcontroller s programming! AT89C51 and 24 of this procedure the test pulse encoder)