I'm using the DebugWire interface for the first time. The chip at hand is the ATMega48 and I'm using the Dragon as my interface.
I got everything working great, including the Debugwire, but then I added an 8mhz ext. crystal. As soon as I did this the DebugWire interace quit working. The circuit still worked fine, so I know the settings and crystal are good.
I then removed the crystal, set the fuses back to the int. osc. but this didn't help, the DebugWire interface still doesn't work.
I then replaced the chip with a new Mege48 and everything worked fine with the int. osc. I added the ext. osc., changed my fuses and now I'm stuck with with another chip that I can't use the DebugWire interface on!
Anyone have any ideas?