Hi

I checked, brown out off, watchdog off. Oscillating
circuity is working fine.

My application does a wake up on change reset on GP3
configured as a GPIO and connected to a switch and by
doing a bit test on the bit 7 of STATUS will determine
the type of reset. Hence a depress of the switch will
cause a reset.

During sleep mode, the oscillator circuit still
operates and it should be shut down too! I tested a
bit banging program that is transmitting a series of 1
and 0 on GP1 using a variable power supply. It does
not work on 3.3V power supply and without
disconnecting the load, I increased the voltage to
4.5V and it works!

Hence I was surprised at the operating behaviour of
the chip though both situation are within the
operating specs of the chip.


--- Herbert Graf <mailinglist@FARCITE.NET> wrote:
>
>         I'm not familiar with that chip but that
> sounds suspiciously like BOD is
> enabled (Brown Out Detect). TTYL
>


> > Currently I am using the PIC12CE518 JW package to
> do
> > my development work. The chip is designed to
> operate
> > over a voltage range of 3V to 5.5V. I wrote a
> simple
> > program to blink two LEDs on two I/O pins on a
> > breadboard with nothing but the PIC chip and its
> > supporting circuity connected up. However a
> strange
> > observation was made. The chip works fine when
> > supplied with a 4.5V supply and when the supply is
> > changed to 3.3V, the LEDs dont blink while one of
> > the LEDs is lit up permanently. Another
> observation
> > made is that when operating on a 3.3V supply, when
> the
> > PIC is put to sleep, the oscillation circuit still
> > operates!
> >
> > A supply of 3.3V is within the operating range but
> > does it give a different operating result?

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