[avrdude-dev] [bug #30756] When setting SUT to 64ms on XMEGA, avrdude doesn't read device signature

[Simone Zamboni]

URL:
  <http://savannah.nongnu.org/bugs/?30756>

                 Summary: When setting SUT to 64ms on XMEGA, avrdude doesn't
read device signature
                 Project: AVR Downloader/UploaDEr
            Submitted by: zsimon
            Submitted on: gio 12 ago 2010 10:18:06 GMT
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: Simone Zamboni
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any

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Details:

I'm using avrdude 5.10 with AVRISP mkII on USB.

In my last project I set up device SUT (start up time) to 64ms to let the
power supply settle. I found that invoking avrdude it reports that the device
signature is 0x000000. I can bypass the error with -F option but I think that
the problem could be easy to fix inserting a 100ms delay before reading the
device after it has been reset.

Device SUT is available for XMEGA devices in the fuse bits.

P.S. With SUT of 4ms, avrdude reads the device signature correctly.




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