timer0_ISR

Hi,

In EZUSB-FX2 manual it says
Timer 0 interrupt is based at int. vector 0x000B with
priority 2.
From the cypress tutorial example fn.,

void timer0_ISR (void) interrupt 1
seems to be hit everytime when timer expires.
How does this work?
I thought you need to write a jmp instruction at
0x000B location and jmp to a ISR we define.

Can someone explain

thanks
ravi