Motorola M68CPU32BUG User Manual download pdf (Page 45)

MC68332TUT/D MOTOROLA

*** Interrupt Initialization on Channel 4 ***

MOVE.W #$0680,(TICR).l ;Interrupt level = 6, base vector = $80

OVE.L #INT,($0210).l ;start interrupt routine at label INT

;assuming VBR is equal to zero

NDI.W #$F5FF,SR ;allow interrupts on level 6 and

;above (assume reset condition of SR)

CLR.L D0

MOVEC D0,VBR ;initialize VBR to zero

ORI.W #$0005,(TMCR).l ;set IARB field to $5

ORI.W #$0010,(CIER).l ;enable interrupts for channel 4

*** Interrupt Routine ***

INT

ANDI.W #$FFEF,(CISR).l ;read and clear interrupt

**** Code for interrupt routine ****

RTE ;return from exception

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Motorola M68CPU32BUG User Manual Page 45