Since you're off exactly by a factor of 4, I suspect either you're not using a 20MHz xtal, a wrong 'fuse' for clock selection or a compiler 'bug'.
hth
jay
Mike Walne
Joined: 19 Feb 2004 Posts: 1785 Location: Boston Spa UK
Posted: Mon Jun 30, 2014 1:40 am
You were told several posts ago to verify that a 1Hz LED flasher runs at EXACTLY the correct frequency.
Have you done that?
You have also reversed the order of #USE and #FUSE.
You initially had them in the wrong order, were told to correct, did so, and have now reverted to the wrong order.
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