S12 / MagniV MicrocontrollersのトピックRe: MC9212XEQ512 - illegal op code interrupt

MC9212XEQ512 - illegal op code interrupt

JohnBarber — Mon, 05 Jul 2010 21:07:21 GMT

Hi,

I'm using a MC9s12XEQ512 and get a illegal op code interrupt.

Can I in some way figure out where in the code the processor was executing when the interrupt occured?

Is the pc register stored in a register or so?

/John

Re: MC9212XEQ512 - illegal op code interrupt

MJW — Mon, 05 Jul 2010 21:31:34 GMT

Hello John,

the exception stack-frame contains the return-address field. The return-address for an illegal op-code exception is basically the PC of the illegal op-code + 2.

HTH,

MJW

Re: MC9212XEQ512 - illegal op code interrupt

JohnBarber — Mon, 05 Jul 2010 21:57:20 GMT

Hi,

and where do I find the excpetion stack frame?

/John

Re: MC9212XEQ512 - illegal op code interrupt

kef — Tue, 06 Jul 2010 14:38:13 GMT

In CPU12X reference manual see TRAP instruction description.

Like on entry into any interrupt handler, CPU return address RA can be found at SP+6. Illegal instruction is at RA-2.