How to generate the Interrupt for SCI?

I use the tms470mf06607,now I can  get  the receive data for SCI1,but  the receive data cannot generate the Interrupt.I use the keil uvision4 because I use  sm470r1b1m-ht and tms470mf06607 at  the same time. I use the code

sciInit();
sciEnableNotification(sciREG1,SCI_RX_INT);
sciReceive(sciREG1,5,data);
//_enable_IRQ();

but  I donnot know how  to use  the "_enable_IRQ();", Who can tell me how to generate the Interrupt  use the C(in the keil uvision),Thank you!