AVR-Chat

Ted Smith wrote:

|    Is it possible to use the ADC input to sense the supply voltage and
|    automatically drive a spare output connected across the reset pin to

>zero when the supply sank to say 4 volts and thus act as a brownout
>detector? 
>If you had a diode to a big enough capacitor for the microcontroller
>supply, the voltage would only fade slowly and I would think you would
>only need to poll the adc every half second or so.
>You might have to enable this only after the ADC was initialised and
>stable after startup.
>  
>
  My only question is why bother with all this?  Is there an AVR device 
that doesn't include the integrasted BOD periphersl?  I haven't looked 
st the data sheets for every AVR there is, but to the best of my 
recollection, every one I have looked at inclkuded BOD on chip.

tom