Power blackouts and brownouts
vipin.malik at daniel.com
Fri Apr 27 11:31:55 EDT 2001
Well, with a name like "ass-a-bet" what can you expect ;)
What is this platform anyway?
David Woodhouse wrote:
> vipin.malik at daniel.com said:
> > No, but most well designed embedded systems will assert the reset
> > line both on power up AND down. Actually, direction does not really
> > matter. Reset is asserted when the power rail is out of spec, which
> > will happen (due to the laws of physics), both on up and down.
> > You wan't the reset line asserted on power down also, else the
> > processor may "wander off" into the weeds and overwrite battery backed
> > RAM or other such stuff if present.
> Note that 'well designed embedded systems' does _not_ include the Intel
> Assabet platform. I believe nothing ever asserts the flash reset line, so if
> you reset while the flash is in a mode other than read mode, the CPU's reset
> vector is pointing at status words :)
> The only way to fix it when you've done this is to remove power, remove the
> battery, and wait for the on-board cap to run out of charge.
> Fun. :)
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