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Thanks, I'll take a look on input pins the may be left floating. I'm usin=
g
PIC18F452, 4MHz XTal with 22pF ceramic capacitor, all near to PIC. The MC=
LR
is tyed to Vcc, WDT ok too.=0D
On Mon, 24 Feb 2003 14:19:12 +1100, Ian McLean wrote:=0D
Checklist for you...=0D
=0D
Also check the watchdog time is disabled in the config fuses=0D
=0D
colin=0D
=0D
1) Check your configuration bits. In my experience though, this is=0D
usually=0D
not the problem, but the following are ...=0D
2) Check that MCLR is tied HIGH.=0D
3) Are you declaring any port as input, or leaving any pin defaulted=0D
to=0D
input, and leaving the pin floating ? This is a common problem with=0D
ICSP=0D
when those port B pins are not used for anything else (should in this=0D
case=0D
be tied LOW when not in use).=0D
4) Check that the XTAL caps are correctly sized and tied to earth.=0D
They=0D
should be ceramic type. Check that your crystal and caps are as=0D
close to=0D
your PIC as possible.=0D
5) Is the crystal you are using within spec. ? The caps need to be=0D
sized to=0D
fit the crystal you are using (check datasheet).=0D
=0D
=0D
--=0D
cdb, bodgy1@optusnet.com.au on 24/02/2003=0D
=0D
I have always been a few Dendrites short of an Axon and believe me it=0D
shows.=0D
=0D
Light travels faster than sound. That's why some people appear bright=0D
until they speak!=0D
=0D
--=0D
http://www.piclist.com#nomail Going offline? Don't AutoReply us!=0D
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body=0D
=0D
=2E=20

--
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