AVR-Chat

Roger that. Thanks!

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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