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TMDXEVM5515: CPU is in idle and cannot jump out

Part Number: TMDXEVM5515

in the EVM5515 demo code which located in ccsv4\emulation\boards\evm5515_v1\tests\demo\EVM_Samples, there is a code snap like below:

StartTimer0();
*(ioport volatile unsigned *)0x0001 = 0x0001;
asm(" idle");

key = Get_Sar_Key();

I followed this code and use it in my code, but the CPU always stays in "asm(" idle");".  Is that because the timer0 doesn't intterupt?