Re: [avr-chat] Using 32.768Khz crystal for timer 2

[Neil Davey]

Hi Ori,

address@hidden wrote:
> I have a simple system with 32.768Khz crystal connected to XTAL1 and XTAL2
> Do I need a special operation to enable it?
>
> I did the following initializations in order to get a 1sec interrupt:
>
>     TCCR2B = 0x05;            /* Osc/128 prescaler */
>     ASSR = _BV(AS2);
Doesn't this attach the timer clock to TOSC pin(s)?
>     TIMSK2 = _BV(TOIE2);    /* enable overflow interrupt */
>
> However no interrupt was generated.
> What did I do wrong?
Are you setting the global interrupt flag? sei()
> --
> Ori Idan
Are you wanting to run the whole micro from the 32K crystal, or just the 
timer?

Regards
Neil Davey