using keil debuuger with interrupts on ez-usb chip

i am using the an2135s ez-usb chip
and i dont know how to make the debbuger get the start of frame interrupts (or any interrupt) for my isochronus data transfers?
when debbuging i get stuck in an infinate loop because i am waiting for an interrupt that doesnt come...
how can i configure the debbuger to work in "real time" with the chip and get the interrupts?

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