Interrupt Controller (INTC)MPC5606S Microcontroller Reference Manual, Rev. 7778 Freescale Semiconductor21.7.2.1 Software vector modeinterrupt_exception_handler:code to create stack frame, save working register, and save SRR0 and SRR1lis r3,INTC_IACKR@ha # form adjusted upper half of INTC_IACKR addresslwz r3,INTC_IACKR@l(r3) # load INTC_IACKR, which clears request to processorlwz r3,0x0(r3) # load address of ISR from vector tablewrteei 1 # enable processor recognition of interruptscode to save rest of context required by e500 EABImtlr r3 # move INTC_IACKR contents into link registerblrl # branch to ISR; link register updated with epilog# addressepilog:code to restore most of context required by e500 EABI# Popping the LIFO after the restoration of most of the context and the disabling of processor# recognition of interrupts eases the calculation of the maximum stack depth at the cost of# postponing the servicing of the next interrupt request.mbar # ensure store to clear flag bit has completedlis r3,INTC_EOIR@ha # form adjusted upper half of INTC_EOIR addressli r4,0x0 # form 0 to write to INTC_EOIRwrteei 0 # disable processor recognition of interruptsstw r4,INTC_EOIR@l(r3) # store to INTC_EOIR, informing INTC to lower prioritycode to restore SRR0 and SRR1, restore working registers, and delete stack framerfivector_table_base_address:address of ISR for interrupt with vector 0address of ISR for interrupt with vector 1...address of ISR for interrupt with vector 510address of ISR for interrupt with vector 511ISRx:code to service the interrupt eventcode to clear flag bit which drives interrupt request to INTCblr # return to epilog21.7.2.2 Hardware vector modeThis interrupt exception handler is useful with processor and system bus implementations which supporta hardware vector. This example assumes that each interrupt_exception_handlerx only has space for fourinstructions, and therefore a branch to interrupt_exception_handler_continuedx is needed.interrupt_exception_handlerx:b interrupt_exception_handler_continuedx# 4 instructions available, branch to continue
