>=20
>=20
> pic microcontroller discussion list <> wrote on Thursday,=20
> July 10, 2003 2:42 PM:
>=20
> > Right.  However, the chip does reset when it is running=20
> normally (not=20
> > in la-la land), so I know the config bit is fine.  And the=20
> config bit=20
> > can't change during operation, as you mentioned.
>=20
> Presuming that "la-la land" isn't where you want the PIC to=20
> be, have you any idea what is making it go there?  Maybe if=20
> you have, someone could suggest how that might combine with=20
> some difference between MCLR and power up to cause the=20
> symptoms you are seeing?
>=20

I am using La-la land to simply mean that the PIC is somewhere that I
don't understand.  The basic sructure of the code is a loop that just
sleeps.  The PIC wakes up in response to an external interrupt.  When it
is in la-la land, it isn't waking up.  It could be anything -- an
infinite loop, or whatever.

> Is the PIC voltage supply stable?  Could it be dropping to an=20
> out of spec level when the PIC goes to "la-la land", eg if=20
> the PIC is driving an output high which is connected to=20
> ground when it gets confused?
>=20

It goes into la-la land when it gets to a serial output (printf in CCS)
statement.  On this board, that isn't connected to anything, but it may
be possible that there is a solder bridge between that pin and a GND
signal.  That could definitley drop the voltage below spec, since it is
just a lithium battery.  If that happened, I could see how the PIC
wouldn't respond to a reset, because the voltage would still be too low.


I will definitelty have to check that out.

Alex=20

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