AVR-Chat

Don't confuse a programmer that is driven by a parallel port with "parallel
mode" programming of the AVR.  All LPT programmers do serial ISP programming
by bit-banging the LPT port lines.  Only the STK500 (AFAIK) supports
parallel mode programming.  One feature of parallel mode is the need for
+12v on the reset line to put it into that mode.  A side effect of that is
that the RESET line does not have any high side protection...  Something to
consider in your next HW design.


-----------
Larry Barello
www.barello.net


| -----Original Message-----
| From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf
| Of Behrooz Hariri
| Sent: Tuesday, July 18, 2006 1:45 PM
| To: AVR-Chat@yahoogroups.com
| Subject: Re: [AVR-Chat] Waking up dead AVR??
| 
| My programmer is STK300 on pc parallel port, yet is unable to wake up mcu.
| Is a 'parallel programmer' something else?
| 
| Mark Jordan <enki@cpovo.net> wrote:
|   If the fuses are badly messed up, only a parallel programmer can
|  restore them to a normal condition.
| 
|  On 17 Jul 2006 at 1:27, Behrooz Hariri wrote:
| 
|  > This kind of problem is already discussed in this group, but I
|  > could never finaly gather what might be a 'standard way' to wake
|  > up a dead AVR when osc fues bits are wrong programmed. Let's
|  > assume I have an AVR on my desk and do not know how osc fuesbits
|  > are programmed. Is the only way trying every possible
|  > configuration? This way doesn't seem a wise one to me. If I were
|  > AVR manufaturer, I would set up a seperate emergency osc.  inside
|  > mcu to at least have access to fues bits to avoid such dead
|  > situations to happen.
|  >
|  >
| 
| 
| 
| 
| 
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