User Manual

4-2 EP7309/11/12 User’s Manual - DS508UM4
Copyright Cirrus Logic, Inc. 2003
Interrupt Controller
4
Programming Examples
ENTRY
;
ldr r15, ResetV
ldr r15, UndefV
ldr r15, SWIV
ldr r15, PAbortV
ldr r15, DAbortV
ldr r15, UnusedV
ldr r15, IRQV
ldr r15, FIQV
;
;*****************************************************************************
; The following is the actual vector table. It contains th e addresses of the routines
; which handle each exception type.
;*****************************************************************************
ResetV
DCD ResetHandler ; (0x0)
UndefV
DCD UndefHandler ; (0x4)
SWIV
DCD SWIHandler ; (0x8)
PAbortV
DCD PAbortHandler ; (0xc)
DAbortV
DCD DAbortHandler ; (0x10)
UnusedV
DCD UnusedHandler ; (0x14)
IRQV
DCD IRQHandler ; (0x18)
FIQV
DCD FIQHandler ; (0x1C)
;*****************************************************************************
; IRQHandler routine check s for Timer1 expire interrupt. Sets G P IO PA 0 -8 low
; Interrupt cleared before return to p rogram.
;*****************************************************************************
IRQHandler
TIMERCHECK EQU 0x00000100
ldr r0, =0x80000000 ; base address for interrupt status register
ldr r1, [r0,#0x240] ; r1 contains timer status from INTSR1
cmp r1, #TIMERCHECK
0x8000.07C0 COEOI R/W --- CODEC EOI page 4-14
0x8000.1700 KBDEOI R/W --- Keyboard EOI page 4-14
0x8000.1600 SRXEOF R/W --- SSI2 FIFO EOI page 4-14
Table 4-1: Interrupt Registers (Continued)
Address Name Type Size Description Page