-----Original Message-----
From: Jack Valmadre [mailto:jack.valmadre@optusnet.com.au]
Sent: Wednesday, 28 January 2004 7:18 PM
To: AVR-Chat@yahoogroups.com
Subject: RE: [AVR-Chat] RESET problems
It is an AT90S8535, however replacing the 10MHz crystal with an 8MHz
crystal did not fix the RESET problem.
I doubt this would be what caused the damage, because I know someone who
runs an AT90S2313 at 20MHz, when it is recommended to run at 10MHz.
Could the problem be fuses?
Jack.
-----Original Message-----
From: Kathy Quinlan [mailto:kat-yahoo@kaqelectronics.dyndns.org]
Sent: Wednesday, 28 January 2004 6:40 PM
To: AVR-Chat@yahoogroups.com
Subject: RE: [AVR-Chat] RESET problems
Is it a mega 8535 or just an AT90S8535 ?
As the old non mega part does not run above 8Mhz, and running at 10Mhz
will cause this problem.
Regards,
Kat.
> -----Original Message-----
> From: Jack Valmadre [mailto:jack.valmadre@optusnet.com.au]
> Sent: Wednesday, 28 January 2004 4:03 PM
> To: AVR-Chat@yahoogroups.com
> Subject: RE: [AVR-Chat] RESET problems
>
>
> I'm using a simple homebrew programmer circuit that consists
> of 5 input lines being connected to MOSI, MISO, SCK, RESET
> and GND. I remember these were 6, 7, 9, 10 and 25 though I
> forget what order. There are two more connections - pin 2-13
> and 3-11 or something like that. I tested all of these
> connections and they're fine. I'm pretty sure the problem is
> the RESET pin because the 8535 runs without the 10k pull-up
> to 5V, and it even runs when I have reset connected to GND. I
> am using a 12V 7.2Ah SLA battery as a power source. The
> circuit uses a 7805 regulator with 2 electrolytic caps to
> produce +5V. The atmel has connections to +5V and GND
> through the Vcc and GND pins; XTAL1 and XTAL2 are connected
> to either leg of a 10MHz crystal, each with a 27pF ceramic
> cap to GND. AVcc, Agnd and Aref are not connected, but I am
> not using PORTA. There are 4 LEDs on pins PC0-3. Thanks, Jack
>
>
>
> -----Original Message-----
> From: Wagner Lipnharski [mailto:wagner@ustr.net]
> Sent: Wednesday, 28 January 2004 2:19 AM
> To: AVR-Chat@yahoogroups.com
> Subject: Re: [AVR-Chat] RESET problems
>
> Jack Valmadre wrote:
> > Hi,
> > I've been running a few simple LED chaser and PWM programs on my
> > AT90S8535 and I just went to switch from my old Windows 98
> computer to
> > my Windows XP machine, when I noticed that the RESET pin wasn't
> > working. No matter what I connect to it, it continues to
> act as if its
> > connected to +5V and nothing else - the previously loaded program
> > still runs. So now my programmer won't work either. I've
> checked the
> > power supply and the continuity between the pin and the
> input and they
> > are both fine. What could be causing this behaviour?
> > Thanks,
> > Jack
>
> Dear Jack,
>
> It is considered wise to explain all the elements of a
> problem when seeking help.
>
> There are many possible causes for your problem, but not
> knowing exactly your instalation, it will be very difficult
> to help. I can imagine several possible missing elements in
> your above text, but instead of be guessing, why dont you
> tell us what is in between your PC and your 8535?
>
> Wagner.
>
>
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