1. Interrupts CML-12C32
Lecture L4.2

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

3. Interrupts
68HC12 Interrupts
Real-Time Interrupts

4. HCS12 Interrupts

5. Register Stacking for Interrupts

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

7. Interrupt Vector Table (cont.)

8. Interrupt Vector Table (cont.)

9. Interrupt (INT)
Module V1
S12INTV1.pdf

10. Monitor Interrupt Vector Table
Off by 2

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

13. S12MEBIV3.pdf

14. Interrupts
68HC12 Interrupts
Real-Time Interrupts

15. Real-Time Interrupt Registers
$0037

16. $0038

17. $003B

19. ; 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

20. rti_init sei ;disable interrupts
ldaa #$59
staa rtictl ;set rti to 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

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

22. 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