AVR-Chat

I suspect you might have set CKSEL to '0000' which
selects external clock.

Try to use a crystal oscillator or build you own and
feed the clock to XTAL1 pin.  An alternative is to use
a AVR chip with CKOUT like ATmega48/88/168/165.

William Lai
MCU ProShop
http://www.mcuproshop.com


--- Ralph Hilton <ralph@ralphhilton.org> wrote:

> On Tue, 19 Jul 2005 03:06:16 -0000 you wrote:
> 
> >--- In AVR-Chat@yahoogroups.com, Ralph Hilton
> <ralph@r...> wrote:
> >> On Mon, 18 Jul 2005 18:21:09 -0000 you wrote:
> >> 
> >> >Dear everybody!
> >> >I have some problem with ATmega64.when I set its
> Fuse_bits to use 
> >an 
> >> >external cristal(7.32 MHz)as system clock, it
> goes wrong and I 
> >can't 
> >> >reprogram it through ISP any more.can anyone
> help me?
> >> >thanks! 
> >> 
> >> Which fuse bits are you setting exactly? Is your
> xtal wired with 2 
> >capacitors?
> >> What are you programming with?
> >> --
> >> Ralph Hilton
> >> http://www.ralphhilton.org
> >> C-Meter: http://www.cmeter.org
> >> FZAOINT http://www.fzaoint.net
> >
> >I set cksel 3..0 and ckopt unprogramed(1), with two
> 22pf capacitors.
> >I'm writing my programs with codevision2.38 and
> proram it with 
> >ponyprog.
> 
> I had a lot of problems with Ponyprog. I suspect
> that your problem wil go if you use an STK500 or
> AVRISP with AVRstudio or the programmer built into
> CVAVR.
> --
> Ralph Hilton
> http://www.ralphhilton.org
> C-Meter: http://www.cmeter.org
> FZAOINT http://www.fzaoint.net
> 



		
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