I'm having issues getting into and out of debugWire mode. I had big time problems back when I used a Dragon, but I haven't had similar problems after I switched to the AtmelIce.
I vaguely recall that I had to make a special header to isolate ISP pins from the Attiny being debugged using debugWire, if they were being used to spi communicate with other devices. But, I thought that was only when I used a Dragon. Maybe that's required with AtmelIce too?
Does anyone know if the AtmelIce "stays off" (doesn't drive them) the SPI pins when debugWire mode?
Also, must other devices on the SPI bus float MOSI/MIS for the device to exit debugWire?