F28035 CpuTimer0 Interrupt issue

Hi,

I tested the CpuTimer1 interrupt but failed, I inserted following codes into a existed project- FlashingLED-F28035, it never step into the interrupt service routin, anyone could pls help to check? in additional I would like to confirm if the CCSv4 supports only ONE s/w breakpoint when debugging?

//;;;;;;;;;;;;;;;;;;;;;;;;;;;

interrupt void CpuTimer1_isr(void);

main()

{

//.............

PieVectTable.TINT1 = &CpuTimer1_isr;
EINT;     // Enable Global interrupt INTM
ERTM;     // Enable Global realtime interrupt DBGM

}

//;;;;

interrupt void CpuTimer1_isr(void)
{
 
}