Re: Strange ICTRL related behaviour on Axiom CME555@40MHz

Hi,

Thanks for the tip, but I found that the application that runs 
correctly exhibited more of a voltage range than the failing 
application:

Good application - 3.17V - 3.30V
Bad application  - 3.19V - 3.31V

Even so, lets say this was the problem, any ideas on how I would fix 
it?   Is there a possible solution I can try and see if the problem 
goes away?

Any other ideas on this?

Thanks!

Jon.
 
> I think you need to check your board 3.3V power
> supply.
> 
> Then ICTRL configured to 7, processor consumes much
> more power than in serialized mode (ICTRL=0).
> Also the chip power consumtion is proportional to the
> system frequency.
> 
> See if the 3.3V supply stays in the +-5% when you
> running the code.
> 
> Regards
>  Alex.
> --- mworksjjf <jfielder@m...> wrote:
> > 
> > Hi all,
> > 
> > I'm having problems with an Axiom CME555 board,
> > running at 40MHz 
> > (MF=9), with ICTRL set to 0x7 (for no serialization
> > and no show 
> > cycles).   
> > 
> > When I debug the code in CodeWarrior (running from
> > external RAM) I 
> > occasionally see an "Instruction Storage Exception".
> >   Other times 
> > when I stop the debugger the program counter is
> > pointing at locations 
> > in internal flash.
> > 
> > I've found that:
> > 
> > Running at 40MHz with ICTRL = 0x0 (Axiom)  => no
> > problem
> > Running at 20MHz with ICTRL = 0x7 (Axiom)  => no
> > problem
> > Running at 40MHz with ICTRL = 0x7 (Axiom)  =>
> > failure
> > Running at 40MHz with ICTRL = 0x7 (Phytec) => no
> > problem
> > 
> > Originally I was working with some complex code that
> > was hooked up to 
> > the external interrupt (PIT).   However, I've now
> > reproduced the 
> > failure using just the standard CodeWarrior Axiom
> > 555 example (main.c 
> > shown below).   
> > 
> > In the default configuration for that example ICTRL
> > is set to 0x0 and 
> > everything work ok; after continuing on from the
> > system call I stop 
> > the debugger and it's in the while loop.   If
> > however, I set ICTRL to 
> > 0x7 then after continuing on from the system call
> > the program counter 
> > is off somewhere unexpected in memory.
> > 
> > Any ideas / suggestions?
> > 
> > Thanks,
> > 
> > Jon.
> > 
> > ------------------------------------
> > 
> > Example Project:
> > 
> > void main()
> > {
> > 	int i=0;
> > 	
> > 	printf("Welcome to CodeWarrior!\r\n");
> > 
> > 	system_call(); // generate a system call exception
> > to 
> > demonstrate the ISR
> > 		
> > 	while (1) { i++; } // loop forever
> > }
> > 
> > 
> > 
> > 
> > 
> 
> 
> 		
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