void Timer1_Init (void) 
{
    ...
    ES0 = 1; // Enable UART0 interrupts 
}

void main (void)
{
    ...
    PCA0MD &= ~0x40; // WDTE = 0 (clear watchdog timer enable) 
    ...
    Timer1_Init();
    EA = 1;
    TI0=1;
}