unsigned char old = 0;
unsigned char dat = 0;
void setup()
{
    DDRD = 0xFF;
    DDRB = 0xFF;
    DDRC = 0x00;

    PORTD = 0x01;
    PORTB = 0x00;
}
void loop()
{

    if((PINC&0x01) && !old)
    {
      if(!dat)
      {
        if(PORTD < 0x80)
        {
            PORTD <<= 0x01;
        }
        else
        {
            PORTB = 0x01;
            PORTD = 0x00;
            dat = 1;
        }
      }
      else
      {
        if(PORTB < 0x20)
        {
            PORTB <<= 0x01;
        }
        else
        {
            PORTB = 0x00;
            PORTD = 0x01;
            dat = 0;
        }
      }
    }
    old = PINC&0x01;
    delay(20);
}