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

Hi,

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 <[email protected]> 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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