Update of bug #37768 (project avrdude):
Status: Need Info => In Progress
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Follow-up Comment #4:
For another test, I tried the attached testcase. It sets
the clock prescaler to 32 (= 250 kHz clock using default
fuses), makes timer 1 overflow each 256 ms to toggle a LED,
and puts the device on sleep otherwise.
I need to specify -B20 on the commandline (50 kHz ISP clock),
but otherwise, the USBtiny works fine with this constellation.
OTOH, since after a reset, the device is being clocked with
the default clock according to the fuses (i.e., 1 MHz), it
is somewhat surprising that -B20 is needed which in turn
slows down the entire ISP. I'll try analyzing that a bit more.
(file #29099)
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Additional Item Attachment:
File name: t45.c Size:0 KB
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