S12Z access violation error

sergemonnerat — Wed, 30 Nov 2022 12:00:00 GMT

Hi,

I use the devkit s12zvc and I get an access violation error when I execute any assembly instruction inside the RTI interrupt. Any first assembly instruction cause an access violation error. The MMCEC register after the error:

MMCEC = 1441

Error code register

Bit Field Values:
ITR bits[ 15:12 ] = 1 S12ZCPU
TGT bits[ 11:8 ] = 4 Program Flash
ACC bits[ 7:4 ] = 4 Data store
ERR bits[ 3:0 ] = 1 Access to an ilegal address range

An idea ?

Best regards

here is my assembly code:

;------------------------------------------------------------
;Copyright 2003-20xx Haute école ARC Ingéniérie, Switzerland.
;All rights reserved.
;------------------------------------------------------------
;Nom du fichier : main.asm

;But : Laboratoire 8.3 (while...)

;Version:
; - OGL/14.09.21 création
;
;------------------------------------------------------------

;--------------------------------------------------------------
; Exportation des symboles
;--------------------------------------------------------------
XDEF Entry,_Startup,RTI_Interrupt
;XREF RTI_Interrupt
INCLUDE 'mc9s12zvl32.inc'

;--------------------------------------------------------------
; Déclaration des constantes d'assemblage (équivalences)
;--------------------------------------------------------------

;--------------------------------------------------------------
; Section pour les variables et les données --> zone de RAM
;--------------------------------------------------------------
DEFAULT_RAM: SECTION

;--------------------------------------------------------------
; Section pour le code et les constante --> zone de ROM
;--------------------------------------------------------------
DEFAULT_ROM: SECTION
; 0 1 2 3 4 5 6 7 8 9 10 11
STATELED: DC.B $04,$0C,$1C,$3C,$7C,$FC,$7C,$3C,$1C,$0C,$04,$00

; Début du programme (ces 2 labels sont utilisés par CodeWarrior)
_Startup:
Entry:

; Clear du flag RTIF
ld d0,CPMUIFLG
or.b d0,#$80;
st.b d0,CPMUIFLG

mov.b #$10,CPMURTI

; Enable RTIE
ld d0,CPMUINT
or.b d0,#$80;
st.b d0,CPMUINT

MOV.B #$FC, DDRT ; configuration en sortie
;Enable des interruptions au niveau de la CPU
cli

; Boucle sans fin
loop:
; Votre code ici...
nop
BRA loop ; Recommence au début de la boucle infinie

RTI_Interrupt:

; Clear du flag RTIF
ld d0,CPMUIFLG
or.b d0,#$80;
st.b d0,CPMUIFLG

ld d0,PTT
eor d0,#$04
st d0,PTT

rti

Re: S12Z access violation error

danielmartynek — Thu, 01 Dec 2022 09:52:51 GMT

Hi @sergemonnerat,

Do other interrupts work?

Why do you include an S12ZVL header file to an S12ZVC project?

Regards,

Daniel

Re: S12Z access violation error

sergemonnerat — Thu, 01 Dec 2022 09:58:41 GMT

Finally the error (very stupid) was that I had not configured the SP ... Thanks !

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