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電路如圖所示：
    
    
    
    程序
    stepper.c
    stepper.hex
    /*
    * STEPPER.C
    * sweeping stepper's rotor cw and cww 400 steps
    * COPYRIGHT (c) 1999 by W.Sirichote
    */
    #include c:\mc51\8051io.h /* include i/o HEADER file */
    #include c:\mc51\8051reg.h
    register unsigned char j,flag1,temp;
    register unsigned int cw_n,ccw_n;
    unsigned char step[8]={0x80,0xc0,0x40,0x60,0x20,0x30,0x10,0x90}
    #define n 400
    /* flag1 mask byte
    0x01 run cw()
    0x02 run ccw()
    */
    main()
    {
    flag1=0;
    serinit(9600);
    disable(); /* no need timer interrupt */
    cw_n = n; /* initial step NUMBER for cw */
    flag1 |=0x01; /* initial enable cw() */
    while(1){
    {
    tick_wait(); /* wait for 10ms elapsed */
    energize(); /* round-robin execution the following tasks every 10ms */
    cw();
    ccw();
    }
    }
    }
    cw(){
    if((flag1&0x01)!=0)
    {
    cw_n--; /* decrement cw step NUMBER */
    if (cw_n !=0)
    j++; /* if not zero increment index j */
    else
    {flag1&=~0x01; /* disable cw() execution */
    ccw_n = n; /* reload step NUMBER to ccw counter */
    flag1 |=0x02; /* enable cww() execution */
    }
    }
    
    }
    ccw(){
    if((flag1&0x02)!=0)
    {
    ccw_n--; /* decremnent ccw step NUMBER */
    if (ccw_n !=0)
    j--; /* if not zero decrement index j */
    else
    {flag1&=~0x02; /* disable ccw() execution */
    cw_n = n; /* reload step NUMBER to cw counter */
    flag1 |=0x01; /* enable cw() execution */
    }
    }
    }
    tick_wait(){ /* cputick was replaced by simpler ASM code 10ms wait */
    asm" JNB TCON.5,*"; /* wait for TF0 set */
    asm" CLR TCON.5"; /* clear TF0 for further set */
    asm" ORL TH0,#$DC"; /* reload TH0 with $DC, TL0 = 0 */
    }
    energize(){
    P1 = step[(j&0x07)]; /* only step 0-7 needed */
    }