东北大学微机原理课程设计：异步电机控制代码

#include <STC12C5620AD.H>  

#define  uchar unsigned char
#define  uint  unsigned int
  uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x40,0x00,0xff};//译码表
      //        0 1 2    3 4  5   6    7 8  9  负号  空格  故障
uchar    P8255_CTL  _at_  0xf803;
uchar    P8255_A    _at_  0xf800;
uchar   P8255_B _at_  0xf801;
uchar   P8255_C _at_  0xf802;
uchar num=0,hour=0,min=0,sec=0;//记录时间
void     delay1ms(unsigned char);
uchar bdata P_C;
sbit cx=P_C^0;    //可位寻址

uchar fangshi1[8]={0x01,0x02,0x04,0x08,0x01,0x02,0x04,0x08};//1相励磁
uchar fangshi2[8]={0x03,0x06,0x0c,0x09,0x03,0x06,0x0c,0x09};//2相励磁
uchar fangshi12[8]={0x01,0x03,0x02,0x06,0x04,0x0c,0x08,0x09};//1-2相励磁
//主程序
//0-7共八位，2，3，4，5代表转速，67代表励磁方式，1代表转向，0代表是否工作
void main(void)
 { 
   P8255_CTL = 0x98; //A口输入，B口输出选择数码管，C上半部分输入，下半部分输出给电机 ,P1口选择数
    P1M1 = 0xff; P1M0 = 0x00;
    if(P8255_A & 0x01==0x01)  //是否启动
{  
TR0=1;//启动T0
   EA=1;  //中断允许
   ET0=1;   //允许T0溢出中断
   

   P_C= P8255_C;
   
  while(1); //等待中断 
   }      
   } 
 
 /*void delay1ms(unsigned char time) //延迟函数
   {
   uchar i; uint j;
   for (i=0;i<time;i++)
      {
  for (j=0;j<355;j++){;}
      }
  }
 
 
  
 
    uint rdtime(void) //读取时间t0  所有的子函数disp，speed12，speed1_2,fangshi,shijian .
  { uchar K1,K2,K3;
  K1 =TH0 ; fangshi>speed12>disp,fangshini>speed1_2>disp,shijian
  K2 =TL0 ;
  K3 =TH0 ;
    if(K1!=K3)
     {K1=TH0;K2=TL0;
      }
 return K1*256+K2; 
 } */

void disp(uint d) //数码管显示