AVR-Chat

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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