Re: Can I noise hang a ColdFire forever...?

Hi guys
Sorry for delay to thanks you your help..but I was in troubles ...
Well...
I connect the bdm pins direct to power connections in order to dosable thses 
pins to be a noise conductor or interference.
I coould see a significant improvement..but not enough to avoid ColdFire 
hangup.
The only way to bring ColdFire back was through reset pin, wich lead me to 
conclude the chip was not latched up...
After I have made lot of tests, I decide to do 3 things
- Add a hw watchdog in any CF design of mine
- Install a metalic cover shield to ColdFire mcu for little more hard 
environment
- Gaveup to believe internal mcu controls can save the chip against noise

Thanks all of you !!!
Ricardo Raupp
...


----- Original Message ----- 
From: "Karl Paton" <[email protected]>
To: "Ricardo" <[email protected]>
Sent: Friday, March 07, 2008 5:31 PM
Subject: Re: [ColdFire] Can I noise hang a ColdFire forever...?


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> Ricardo,
>
>> *- Is there a way to know if ColdFire is simply stopped due to lack of 
>> enabled protections from the programmer fail (me!) , or stopped because 
>> the core got latched up or some condition like this, due to such 
>> disturb?Ex. verifying current consuption?*
>
> I don't know the Coldfire well but with the 68K enough noise can lead to a 
> double bus fault (exception upon an exception) which will halt the 
> processor.
> If the double bus fault monitor is enabled the processor will reset itself 
> but, if not, it will just halt/hang and can only be restarted with an 
> external reset.
>
> It seems the Coldfire has a similar "fault-on-fault" halt which might the 
> culprit.  Maybe worth looking at?
>
> Regards,
> Karl
>
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