Re: LZ: Timer interrupt when LCD is off?
[Prev][Next][Index][Thread]
Re: LZ: Timer interrupt when LCD is off?
I only glanced at the APD routine itself, but it only seems to switch off the LCD....
Andreas
----------------
E-Mail: ess.andreas@computerhaus.at
Webpage: http://andi.ganymed.org
----------
> Von: Jeff Tyrrill <Jeff_Tyrrill@msn.com>
> An: list-zshell@lists.ticalc.org
> Betreff: RE: LZ: Timer interrupt when LCD is off?
> Datum: Monday, July 07, 1997 8:55 PM
>
> The ON key itself is an interrupt, so it "wakes up" the processor. When the
> calculator is off, the next code that is executed turns on the LCD and resumes
> operation. If you just turned off the LCD, the batteries would be drained
> really quickly.
> ________________
>
> Jeff Tyrrill
> http://tyrrill-ticalc.home.ml.org/
> http://ti-files.home.ml.org/
>
>
> -----Original Message-----
> From: owner-list-zshell@lists.ticalc.org On Behalf Of Rigor Mortis
> Sent: Sunday, July 06, 1997 10:59 PM
> To: list-zshell@lists.ticalc.org
> Subject: Re: LZ: Timer interrupt when LCD is off?
>
> 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
>
> --
> /-----------------------------------------------------------\
> | TI-85 Shell Central |
> | http://members.tripod.com/~Llama_/ |
> | ksmith@capitol-college.edu |
> | |
> | "..why? because it's useful.." |
> \-----------------------------------------------------------/