AVR-Chat

Can be set and cleared at will!

----- Original Message -----
From: erikc <firewevr@airmail.net>
To: <AVR-Chat@yahoogroups.com>
Sent: Friday, April 16, 2004 11:53 AM
Subject: Re: [AVR-Chat] Re: keypad and mega64


> A rank newbie has a question.  These "fuses" that you
> mention, are they one-time programmable (like a real fuse)
> or are they really something like an EEPROM cell that can be
> set and cleared at will?
>
> Erikc  - firewevr@airmail.net
> ///
> "An Fhirinne in aghaidh an tSaoil."
> "The Truth against the World."
>         -- Bardic Motto
>
>
> ----- Original Message -----
> From: "chris atwan" <chrisatwan2000@yahoo.com>
> To: <AVR-Chat@yahoogroups.com>
> Sent: Friday, April 16, 2004 14:48
> Subject: Re: [AVR-Chat] Re: keypad and mega64
>
>
> > Brian,
> >
> > I verified that the JTAGEN fuse is "1".  Any ideas??
> >
> > Chris Atwan
> >
> >
> > Brian Dean <bsd@bdmicro.com> wrote:
> > Hi Chris,
> >
> > On Fri, Apr 16, 2004 at 01:56:39AM -0000, chrisatwan2000
> wrote:
> >
> > > I checked my fuses with AVR Studio and the following
> fuses are set:
> > >
> > > BOOTSZ=11
> > > BODLEVEL=1
> > > CKSEL=1111 SUT=11
> > >
> > > Any ideas??
> >
> > The above fuses are in the low fuse byte.  You want to
> look at the
> > "high" fuse byte - the JTAGEN bit is bit number 6.
> >
> > In Atmel terminalogy, a fuse is "set" or "programmed" if
> it is '0'.
> > It is "unset" or "unprogrammed" if it is a "1".  However,
> I think in
> > AVR Studio, a check mark on the fuse setting sets it to a
> "0", i.e.,
> > programs the fuse.
> >
> > Look at the high fuse byte, specifically bit number 6.  If
> it is a
> > zero, then the JTAG debugging interface is enabled.  If it
> is a one,
> > then it is disabled.  It is enabled by default, so unless
> you disabled
> > it, it is most likely still enabled.  If it is enabled,
> then that
> > would most likely explain the problems with your program
> not getting
> > the expected results when using PORTF.
> >
> > For more info, the "Memory Programming" section of the
> ATmega128
> > datasheet.  The high fuse byte is described on page 292 in
> the version
> > I have.
> >
> > -Brian
> > --
> > Brian Dean
> > http://www.bdmicro.com/
> >
> >
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