AVR-Chat

At 09:31 PM 15/05/2009, you wrote:
>This suggests that the internal osc is running at 16MHz.

You are a MIRACLE worker. :-)

>(but Bod is not enabled, which the datasheet says it should be with 
>this setting). If I
>change it to 6CK+64ms then it appears to start up correctly every time.

So why not used the BOD as the data sheet says you should? Do you 
have a cap on the
reset line?

Most likely the chip and oscillators are wobbly at power up and
the chip is not being initialised correctly seeing the a reset
gets it working correctly after the oscillator has stabilised.


Regards

John Samperi

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