On Wed, 30 Oct 1996, Alex I. Torres wrote:

>  > I'm working now on a project using PIC16C84, and I have some
>  > problems with the power feeding.
>  >
>  > A point in the problem specification is that in the case of
>  > power failure the product has to be able to restore the
>  > previous status and to continue his job. All seems to be
>  > simple: store the status in data EEPROM and restore it on
>  > reset.
>  >
>  > If the power failure is longer than aprox. 1 sec. everything
>  > is ok, but my system die if the power failure is shorter!
>
> Dan:
>
> To my mind you use the simple RC to reset the PIC and your
> capicitor does not discharging during the power failure.
> Try to use a diode from reset (+) to power (-).
> Or use a special chip - MAXIMs or Analog Devices.
>

I'm using the MCLR pin for in circuit programming. The power on reset is
performed by PIC16C84 internal power on reset circuit. I'm also using the
internal power on reset timer.

Dan