AVR-Chat

I am sorry if I mis-typed.  It is TC1A triggering a TC0 interrupt.

I have not tested this on the ATmega128, because I just got it 
today, and I am waiting for my ICE-cube which will arrive in a day 
or 2.

It has got to be a simulator issue.  I agree that only one interrupt 
will get triggered for an individual timer function.  It is just 
that I can clearly see the TC0 overflow interrupt get set as the 
TC1A OC interrupt is cleared.  

I tried to use TC1B, and that will not even get the TC1 counter 
counting when I enable TC1B.  If I only change to code to enable 
TC1A, then the counter runs perfectly!

I have not seen any posts about timer simulation problems in the 
newest version of AVRStudio, but there have been issues for various 
ATmega device timer simulations in the past.  I suppose these have 
yet to be resolved.

oh well.

I will get my ATmega programmed asap.  I am using the MAvric-IIb 
board.

-Tony

--- In AVR-Chat@yahoogroups.com, "airmaledfw" <airmaledfw@h...> 
wrote:
> 
> --- In AVR-Chat@yahoogroups.com, "arhodes19044" <spamiam@c...> 
wrote:
> >  
> > When the 2 timers are running simultaneously then I get the 
timer 1 
> > output compare triggering the timer2 overflow function (I can't 
> tell 
> > if the code is jumped to, or if there was an interrupt to get 
> there).
> > 
> Tony,
> 
> It isn't possible for a timer1 OC to trigger a timer2 interrupt 
> service routine.  When an interrupt occurs (and it's interrupt 
flag 
> is enabled) and interrupts are also globally enabled, the AVR 
vectors 
> to an address reserved for that interrupt.  At that address, 
another 
> address will be found which is placed there by your compiler.  
This 
> is the memory address at which the compiled interrupt service 
routine 
> has been placed.  Guessing that your code is written as standard 
> interrupt service routines are, the only "normal" way to get there 
> would be through an actual interrupt (not a "jump" or "goto" 
> unrelated to an interrupt).
> 
> What chip are you working with (this will help with register 
> identification) and does it have JTAG?  Perhaps this 
> is just a simulation issue (as you suggest) and not a real world 
> issue.