Re: A89: Turning LCD Off (and a lot more)
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Re: A89: Turning LCD Off (and a lot more)
Btw, I came to the conclusion after reading the doc that $60001D:4 when
set high turns the LCD off. Obviously, while low it is on. And, instead
of stopping timers, I slowed the oscillator down...
Olle Hedman wrote:
>
> Hi, it's me again :)
> I got hold of Johan Borg now, and could ask him some questions.
> according to him, the calc takes about 16-20mA when fully on.
> If you turn off osc1 it takes 4-5mA, so the cpu and stuff is the most
> powerhungry. of those 4-5mA most of it is the lcd.
> So you will save about 25% on turning off the lcd with osc2.
> He also said that $600015:1 (that you have tried) actually reduces most of the
> power the lcd takes.
> he also said that you can save some power by putting the contrast fully in one
> endpoint (even with the lcd off), he didn't know right now, wich of them was
> best though. And you could also save some by putting all the pins of the battery
> detection (port $600000) high.
> But that is not giving very much compared to turning off the lcd.
>
> Details about battery detection and contrast can be found in 89hw.txt
>
> he said there was a small chans that turning off osc2 affected the link port
> logic, but he didn't think so. try it :)
>
> //Olle
>
> Olle Hedman wrote:
> >
> > Just read your text a bit more closely. I guess you don't want to just wait for
> > calls, but activly use the link port.
> > Then just turn off the lcd&co. (osc 2).
> > Then, if you somewhere needs to wait for something on the linkport, then maybe
> > turn off osc1 too...
> >
> > //Olle
> >
> > Olle Hedman wrote:
> > [a lot of crap ;)]
--
Scott "_Wrath_" Dial
wrath@calc.org
ICQ#3608935
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