EA = 0;                        /* disable interrupts */
    TMOD = (TMOD & 0xF0) | 0x01;   /* Set T/C0 Mode */
    ET0 = 1;                       /* Enable Timer 0 Interrupts */
    TR0 = 1;                       /* Start Timer 0 Running */
    EA = 1;                        /* enable all interrupts */