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可预制的倒计时钟。可预制的倒计时钟,p35个位，p34十位，p32确定

P32口输出PWM口  P33调加  P34调减 P0和P2口数码管显示

#nclude<reg51.h>#include<intrins.h>#销nclude<math.h>#include<string.h>struct PID{unsigned int SetPoint；//设定目标 Desired Value unsigned int Proportion；//比例常数Proportional Const unsigned int integral；//积分常数Integral Const unsigned int Derivative://微分常数Derivative Const unsigned int LastE ...