One thing I've noticed is that startup takes a LONG time, like 3
seconds, when I'm not using a crystal.  When using a crystal, it boots
up instantly.

The oscillator is set to IntRC in the config byte, and the PWRT, MCLR,
BODEN, and CCPMX flags are set (CP and Write enable are off.)

I'm wondering if the bootloader is being stupid and just using the IntRC
at 32khz instead of immediately bumping it up to 8 MHz.  Might be time
to try yet another bootloader...

-David

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
Of Michael Rigby-Jones
Sent: Friday, October 07, 2005 3:59 AM
To: Microcontroller discussion list - Public.
Subject: RE: [PIC] Power Concerns - Can't get the chip to start on my
own voltage source

Something sounds screwy to be honest.  A 10k resistor from MCLR to Vdd
should be perfectly adequate (that's what most of my designs have).  The
resistor does not "enable" power on reset as such.  What it does do is
allow in circuit programming, and if combined with a capacitor and
another resistor gives a delayed power on reset which can be helpful in
some circumstances.  If the 10k was open circuit etc. then this would
cause you a lot of problems.

I would check that you have the brown-out reset, and power up timer
enabled in your configuration fuses, and that you have the correct
oscillator configuration if you are using an external crystal/resonator.
These are very important for reliable start up.


Regards

Mike

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