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Re: Power Supply Sequencing - Latchup - FOLLOWUP

2005-01-19 by Richard

If you find yourself in an exception handler, probably looping
indefinetly because it is not really a "handler", then you are not
latched up, yoou are executing code.

Richard

--- In lpc2000@yahoogroups.com, "moostieuk" <moostieuk@y...> wrote:
> 
> We appear to have this problem on the LPC2114.  Our prototype board
> appears to latch into a state sometimes on powerup.  If you take the
> reset line down and back up when in this state the processor still
> doesn't come up.
> 
> Interestingly, if you attach the debugger to the processor it's
> sitting in the "undefined instruction" handler, if you tell it to jump
> to the reset handler it does so and starts to execute but then finds
> it's way back into the undefined instruction handler....
> 
> This problem is most noticable when flicking the power on and off
rapidly.
> 
> Philips, I think we have a problem......
> 
> --- In lpc2000@yahoogroups.com, "g2100g" <g2100g@e...> wrote:
> > As described in the Errata Sheet, available on Philips web site: "The 
> > last letter in the third line (field `R') will identify the device 
> > revision." 
> > 
> > --- In lpc2000@yahoogroups.com, "jamesradix1969" 
> > <jamesradix1969@y...> wrote:
> > >
> > > How can you tell which version of the chip you have?  Is it part of 
> > > the printed markings on the chip?  Do other family members (2129) 
> > > have this problem too?
> > > Thanks,
> > > James

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