You can make a cheap and dirty brownout reset for a 12C508 (or anything
else) with a ala' App note AN522 figure 7.  I use these on a steam iron
control, and the parts cost is near US$0.03 in volume.  Pretty hard to beat.

It's not a precise brownout circuit, but my tests have shown it to work
reliably.


--Lawrence

----- Original Message -----
From: "Peter L. Peres" <plp@ACTCOM.CO.IL>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, July 27, 2001 6:01 AM


> >- The 12C508A is about 80 cents, but requires external BOR, but has int.
> >clock.
>
> In my experience the watchdog in a 12C508A can substitute for a missing
> BOR if you apply some continuous self-checking algorythm (cpu exercizer
> etc).
>
> Peter
>
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