Texas Instruments TMS320C28x Reference Manual page 83

Fetch the interrupt vector and load it into the program counter (PC).
-
For devices with a PIE module, the vector fetched will depend on the
setting of the PIE enable and flag registers.
4) Execute the interrupt service routine. The C28x branches to its corre-
sponding subroutine called an interrupt service routine (ISR). The C28x
branches to the address (vector) you store at a predetermined vector loca-
tion and executes the ISR you have written.
CPU Interrupts Overview
CPU Interrupts and Reset 3-3