Hello everybody,
I've been reading a bit the datasheets of both Atmega 2560 & Atmega32U2, but I have a question:
If I try to program these two chips by entering in High voltage programming (Serial/Parallel, this means applying 12 Volts to RST), could the rest of the board be damaged?
If not, do I have to power the board or just connect the programmer to the processors (for example AVR Dragon)?
Thank you and cheers.
Replies
Hi,
High voltage should not be necessary. Unless the fuse bit to make the RESET pin a normal IO pin has been set (or reset, don't remember). If the ARM reacts normally on reset (APM default), just use normal active low RESET.
Yes you connect the ISP programmer to the header on the board and apply power and that is it. You can even overwrite the bootloader if you want to, it is not essential. Or restore the bootloader again with the ISP programmer eg if you sell the APM.
ISP is faster and more reliable than bootloader STK500 serial :)
Regards
Soren