On Wednesday 28 December 2005 3:08 pm, MuRaT KaRaDeNiZ wrote:
> Hello Micah,
>
> Though not an Atmel AVR device, I've seen a case where is an unconnected
> serial port header was picking up electromagnetic interference in a
> harsh industrial environment. This was a susceptibility case, but in
> the final product i'll consider a second hardware checkpoint before
> flashing the eeprom with the incoming bytes :)
>
> If you want to feel safe, put a rise time limiting series resistor close
> to the uC's pin, it will help you limit the frequency content of the
> net. It's not just the header but also the pcb trace can act as an
> antenna and radiate/pick up. Doing this also makes your power rails
> inside the uC cleaner. Motorola HCS08 devices have for example
> programmable rise time for the IO, you can select between strong/weak
> etc. push/pull operation.
>
>
> Regards
>
> Murat Karadeniz
> http://www.onlinefavbar.com/mukas/
>
>
>
>
> -----Original Message-----
> From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On
> Behalf Of Micah Stevens
> Sent: Wednesday, December 28, 2005 9:58 PM
> To: AVR-Chat@yahoogroups.com
> Subject: Re: [AVR-Chat] DebugWire question..
>
>
>
> Wow, at 10Ghz, yes, I'd agree. I'll try it and hook up the spec an, and
> see
> what I get I guess. Thanks for the reply, makes me feel better about it!
>
> -Micah
>
> On Wednesday 28 December 2005 8:48 am, Brian Dean wrote:
> > On Tue, Dec 27, 2005 at 09:59:53PM -0800, Micah Stevens wrote: >
> > However, I need to use one pin of the serial interface(MOSI I think)
> >
> > > as a PWM output. I'm concerned that during normal operation, any >
> >
> > sort of header would just turn into an antenna at the PWM >
> > frequencies I'm using.
> >
> > Unless you are PWM'ing on the order of around 10 GHz, I think you
> > will be OK.
> >
> > -Brian
> > --
> > Brian Dean
> > ATmega128 based MAVRIC controllers
> > http://www.bdmicro.com/
> >
> >
> >
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