AVR-Chat

praveen gudi wrote:
> Hi,
> I think u should select a proper prescaler for timer1.
> If the pprescaler is zero, means timer will not run.
> Check the data sheet again about prescaler.
> bye.
> 
> */Don AE5K <don@ae5k.us>/* wrote:
> 
>     I'm not sure if I am missing something or if the simulator of the AVR
>     Studio 4.12 with service pack 2 (or SP1 too) is broken, but in
>     simulation I cannot seem to get Timer/counter 1 counting in my
>     tiny45 code.
> 
>     I have TCCR1 = 0x41, and OCR1C = 0xF4, all the remaining registers are
>     at their default 0 value.  In addition, PRR=0x00, PLLCSR=0x00 and
>     CLKPR=0x00.
> 
>     Is there some other bit somewhere I must set to get this counter
>     working?  TCNT1 remains at 0 when simulator is run.  Haven't gotten any
>     further to see if the counter is counting in real life.
> 
>     Hints?  Experience?
> 
>     Thanks,
>     Don
>     --------
> Praveen Gudi,
> Embedded Software Engineer,
> Invictus Technologies,
> Bangalore- 560 044

Thanks for the hint Praveen, but as shown above the prescaler (the lower
nibble of TCCR1) is 1 and not zero. (and in fact when I first tried it,
the prescaler nibble value was hex F, divide by 16384)...

BUT, I have done more digging in the documentation of Studio/Simulator,
and buried under the known problems for the tiny25/45/85 is NO SUPPORT
for TC1  ! ! !   If one is to believe the documentation, then that is
apparently my problem -- the simulator just won't do timer/counter #1 in
the tiny45.  Bummer.    I had submitted a tech help request to Atmel
support before I found that tidbit of information, so we'll also see
what their reply is.

Thanks everyone!

Don