/*
   PIC12F629       4MHz
Last   2010/9/24
*/
sbit        LED    at   GPIO.B2;
sbit        SW     at   GPIO.B3;
short       FLAG,Mode;
//
extern      void      SW_CK();

void main()
{
    CMCON=7;            //COMP off
    TRISIO=0b00001000;
    GPIO=0;
    FLAG=0;
    Mode=0;
    //
    while(1){
      if (FLAG==1)
         LED=~LED;
      Delay_ms(500);
      SW_CK();
    }
}

void SW_CK()
{
   if (SW==0){
    while (Button(&GPIO,3,1,1)==0);  //SW over ?
      Mode++;
        switch (Mode)
        {
        case 1:              //LED on
             LED = 1;
             break;
        case 2:
             FLAG = 1;
             break;
        case 3:              //LED off
             Mode = 0;
             LED = 0;
             FLAG = 0;
             break;
//        default:
        }
    }
}