Re: LZ: Timer interrupt when LCD is off?


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Re: LZ: Timer interrupt when LCD is off?



Of course, the shutoff routine would have to changed:

Loop:
 halt	;<- save space
 in a, (3)
 bit 3, a	;on pressed?
 jr	nz, Loop

What's the low-power mode(port 6, I think) exactly?
 Andreas
----------------
E-Mail:  ess.andreas@computerhaus.at
Webpage: http://andi.ganymed.org

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> Von: Rigor Mortis <ksmith@capitol-college.edu>
> An: list-zshell@lists.ticalc.org
> Betreff: Re: LZ: Timer interrupt when LCD is off?
> Datum: Monday, July 07, 1997 7:58 AM
> 
> From all that talk about how the calc is reset if you take out a battery
> and press the on key, it would seem that after the calc is turned off,
> the processor doesn't do anything until ON is pressed, which would mean
> no interrupts are occuring.  I don't remember how it checks for the ON
> key when it's off though; if it uses an interrupt to check for the ON
> key (when it's off), then it might be possible.
> 
> If you just turned the LCD off and didn't turn off the rest of the calc
> (maybe just set the contrast to 0), the processor would still be
> running, and you could have interrupts going, and have a loop checking
> for the ON key interrupt.
> 
> Hey, I'd love to be proven wrong.  Having a clock that keeps the current
> time even when the calc is turned off would be nice (like on the HP48).
> -mortis
> 
> Ess Andreas wrote:
> > 
> > Is that possible? Would be useful for several things, like real-time clocks, etc.
> > 
> >  Andreas
> > ----------------
> > E-Mail:  ess.andreas@computerhaus.at
> > Webpage: http://andi.ganymed.org
> 
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