On Wed, 11 Sep 1996, Jimmie Curry wrote:

> I find myself coming to the well.  Please help if you can!
>
> I have created a new design using the PIC17LC44-08I/L.
> Vcc is 3.0 Volts.
> Oscillator mode is XT.
> Processor Mode is Microcontroller Mode.
> WDT is disabled.
>
> I have used Osc design as pictured in DS30412A Page 2-922.
> C1     = 18pF
> C2     = 18pF
> XTAL = Epson MA-506 at 4.9152 MHz. (AT cut)
> Note1 Resistor:  I have tried values ranging from 0 Ohm to 3K Ohm without
> much success.
>
> Problem is excessive startup time, if it will run at all.  Power on time is
> not an issue. Wakeup from sleep mode is critical!
>
Jim,

I've had similar trouble while working at low-ish supplies. I found that a
separate power-on reset is required. The Maxim series are quite good. This
will give a known power-on delay and they're usually quite repeatable.

Failing that you may want to use the WDT to give you some brown-out
protection.

Hope it helps.

Rich


Department of Applied Physics, University of Hull, HU6 7RX
Tel 01482 465135  Fax 01482 465606 // E-mail R.J.Smith@apphys.hull.ac.uk