Interrupts CML-12C32 Lecture L4.2

References S12CPUV2 Reference Manual Section 7 S12CPUV2.pdf CML-12C32 Development Board for Motorola MC9S12C32 CML12C32_UG.pdf Interrupt (INT) Module V1 S12INTV1.pdf CRG Block User Guide V04.05 S12CRGV4.pdf

Interrupts 68HC12 Interrupts Real-Time Interrupts

HCS12 Interrupts

Register Stacking for Interrupts

Interrupt Vector Table Ref: MC9S12C Family Device User Guide 9S12C128DGV1.pdf

Interrupt Vector Table (cont.)

Interrupt Vector Table (cont.)

Interrupt (INT) Module V1 S12INTV1.pdf

Monitor Interrupt Vector Table Off by 2

S12MEBIV3.pdf Multiplexed External Bus Interface (MEBI) Block User Guide Module V3

S12MEBIV3.pdf

Interrupts 68HC12 Interrupts Real-Time Interrupts

Real-Time Interrupt Registers $0037

$0038

$003B

; RTI test outa equ $FF4F rti_ivec equ $0FF2 crgflg equ $0037 crgint equ $0038 rtictl equ $003b org $800 ticks dw 0 Note: Should be $0FF0. Monitor error Interrupt routine increments ticks

rti_init sei ;disable interrupts ldaa #$59 staa rtictl ;set rti to 10.24 ms ldaa #$80 staa crgint ;enable rti ldx #rti_intser stx rti_ivec ;store rti int vector cli ;enable interrupts rts rti_intser ldd ticks addd #1 ;inc ticks std ticks staa crgflg ;clear rti flag rti

ORG $4000 main jsr rti_init ldab #10 mn1 tba jsr hexasc jsr outa bsr sec_delay decb bne mn1 swi

sec_delay pshb ;save B ldd ticks std 2,-sp ;store tick0 sd1 ldd ticks ;read ticks subd 0,sp ;diff = ticks-ticks0 cpd #100 ;repeat until 100 ticks blo sd1 leas 2,sp ;fix stack pulb ;restore B rts