I soldered two ATMega128 chips on development boards and one of the chips had no ISP communication at all. The other worked for some time and it also finnaly quited too.
I also saw that the fuses were programmed and i never did it .
Now i have no more ISP communication .I can't even read the chip's signature .The MISO line appears dead .. Does any one had problems like these? I suspect that the problems come from my programmer . Any suggestions about how to deal with these chips? .Or recomendations on how to avoid problems with the ISP interface.
Or maybe have a look here (a single sided hobbyist board)
**broken link removed**
Ohh.............
Code:
4 Common mistakes on a new Mega128
1: Dont connect the PEN pin , (you should NOT connect it)
2: It ships from factory with the Mega103 compatibility fuse set
So it's a Mega103 , until you clear that one.
3: It ships from factory with the default 1Mhz internal oscillator enabled
(Fuses again). When programming via ISP , be sure the ISP programmer
frequency is max 1/4 of clockspeed.
4: MISO/MOSI isn't used for programming the chip