Philips LPC2129 - Page 303

RealMonitor 303 May 03, 2004
Philips Semiconductors Preliminary User Manual
LPC2119/2129/2194/2292/2294ARM-based Microcontroller
;MSR spsr, r12 ;Restore SPSR from r12
;STMFD sp!, {r0}
;LDR r0, =VICBaseAddr
;STR r1, [r0,#VICVectAddrOffset] ;Acknowledge Non Vectored irq has finished
;LDMFD sp!, {r12,r14,r0} ;Restore registers
;SUBS pc, r14, #4 ;Return to the interrupted instruction
;user interrupt did not happen so call rm_irqhandler2. This handler
;is not aware of the VIC interrupt priority hardware so trick
;rm_irqhandler2 to return here
STMFD sp!, {ip,pc}
LDR pc, rm_irqhandler2
;rm_irqhandler2 returns here
MSR cpsr_c, #0x52 ;Disable irq, move to IRQ mode
MSR spsr, r12 ;Restore SPSR from r12
STMFD sp!, {r0}
LDR r0, =VICBaseAddr
STR r1, [r0,#VICVectAddrOffset] ;Acknowledge Non Vectored irq has finished
LDMFD sp!, {r12,r14,r0} ;Restore registers
SUBS pc, r14, #4 ;Return to the interrupted instruction
END