It would seem so bit I don't remember seeing a 'reset' chip in the 5680. I'm wondering if there's scope to add one onto the rail that runs the PSD and 80C320 to keep it in reset. On 9 Jun 2016 13:00, "Bob Camp" <kb...@n1k.org> wrote:
> Hi > > Based on the number of different ways there seem to be to corrupt the > operating software > in the FE Rb’s …. they seem to have a unique problem. There are a *lot* of > devices > using the same basic parts that don’t turn into a brick when this or that > happens. > > Bob > > > On Jun 9, 2016, at 4:31 AM, Hal Murray <hmur...@megapathdsl.net> wrote: > > > > > >> The ATTinys have brownout detectors in them that’s supposed to keep them > >> from going bonkers during undervolt periods. > > > > Startup and/or brownout has long been a nasty problem area for digital > > designers. > > > > In the old old days, there was typically a R/C delay on the reset pin to > a > > CPU. That screwed up when the power supply ramped up slowly enough. > Most > > old timers have that merit badge. > > > > Modern CPU chips often have specs like power must be OK for 200 ms before > > releasing Reset. Anything like that will have at least one corresponding > > power monitor chip with several supply voltage inputs and the appropriate > > delay. > > > > The brownout side gets ugly when you look at the tolerances. The > tolerance > > on the power monitor subtracts from the power supply tolerances. > > > > There is another worm in the can. How long does it take for your > oscillator > > to get going? > > > > > > > > -- > > These are my opinions. I hate spam. > > > > > > > > _______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.