I'm using an AVR One to program/debug an ATTiny85 board running on the Tiny's internal oscillator. This is a board I developed a few months ago, programmed/debugged, put aside and am doing some more debugging on now.
When I first fired up AS 5 on the AVR One today it asked if I wanted it to set the DWEN bit, so I said sure, cycled the power, and did some debugging. When I tried to program some changes to the code, I can't switch to ISP mode. When I try, I get a warning, "Unable to enter programming mode" and I can't read or program anything. This is after I "Stop Debugging" which I thought reset the DWEN for me. Maybe I'm leaving out a step (likely, if I don't use this stuff at least once a week, which I don't, I'm afraid).
What am I doing wrong? Thanks.
PS - I also have an AVRISP mkII that can't access the device either, so I'm assuming the DWEN bit isn't being reset.