AVR-Chat

Forgot to mention:
I am using PonyProg 206c on WinXP home.
Jack.


-----Original Message-----
From: Jack Valmadre [mailto:jack.valmadre@optusnet.com.au] 
Sent: Wednesday, 28 January 2004 6:03 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.


Yahoo! Groups Links
• To visit your group on the web, go to:
http://groups.yahoo.com/group/AVR-Chat/
  
• To unsubscribe from this group, send an email to:
AVR-Chat-unsubscribe@yahoogroups.com
  
• Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. 


Yahoo! Groups Links
• To visit your group on the web, go to:
http://groups.yahoo.com/group/AVR-Chat/
  
• To unsubscribe from this group, send an email to:
AVR-Chat-unsubscribe@yahoogroups.com
  
• Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.