I think of buying an AVR Dragon or an AVR JTAG ICE MKIII. But before I do this, I need to know what side effects the reduced debug frequency has on an ATMEGA328P while debugging. I make heavy use of UART, Timer0 and Timer1 at a frequency of 16 MHz.
In particular the UART should work while debugging. Is this ensured?
Which debug device do you prefer? Does it work with Atmel Studio 6? I am fimiliar with the PicKit2 as a debugger.