Re: [avrdude-dev] Eratic Mega168 behavior?

[Galen Seitz]

Bob Paddock <address@hidden> wrote:

> 
> I fired up a old STK500 board on my Gentoo Linux box with
> a new, fresh from DigiKey, Mega168.  I am getting random
> signature and fuse read failures.  Does anyone have any suggestions?
> 
> I did see the bug report about the unused efuse bits in the m168, but what
> I'm seeing is happening in the other fuses and signature as well.
> 
> Clock to fast maybe?
> 
>          SCK period      : 1.1 us

If the fuses are in the factory default state, then SCK is too fast.  The
mega168 is running at 1MHz (8 MHz internal osc with 1/8 prescaler).  SCK
frequency needs to be less than or equal to one quarter of the system
clock.  Try setting SCK period to 4.4 us.

galen