I have a bricked Atmega644PA because of bad fuses setting. I am not sure how were the fuses exactly set, but I cannot connect using AVR Dragon (ISP) with any clock speed. I have read however, that it is possible to unbrick the device using High voltage programming. I have never used HVSP before. Because of that, I find it hard to even wire my MCU with the Dragon. On this page ( http://www.atmel.com/webdoc/avrd... ) there is a description of HVSP dragon pinout "for all parts except ATtiny24/44/84 ":
The problem is, I cannot figure out how those pins correspond to those in Atmega644PA. Googling around I have found some example images connection to an Attiny chip. From there I derived that the connections are the following:
SII - MISO
SDI - MOSI
SDO - SCK
SCI - XTAL1
Are those valid?
The second point it, how to connect power to the MCU? Should I use on board voltage (which is 3.3 V in my situation) or should I apply it from the Dragon?
I would really appreciate all help regarding this issue. How exacly should look the wiring diagram for this device (Atmega644PA) and AVR Dragon?