[TI-H] Re: TI-83P SE hardware, looking for thoughts
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[TI-H] Re: TI-83P SE hardware, looking for thoughts
Well, it seems odd that the xtal would be used to generate the interrupts,
as none of the previous calculators use it for interrupts, and there's no
need for interrupts to be generated that accurately.
Basically I'm trying to see what possibilities *other* than an RTC could
make sense. (Because it would be hard to show that there *is* and RTC
unless it can be started (which is a different story, I've been playing with
ports...), especially because it seems that it would be integrated in the
custom TI chip).
-Dan
----- Original Message -----
From: "Alejandro Paz" <psys@cotelco.com.ar>
To: <ti-hardware@lists.ticalc.org>
Sent: Tuesday, July 24, 2001 8:26 AM
Subject: [TI-H] TI-83P SE hardware, looking for thoughts
>
> Hello,
>
> The interrupt freq varies with the voltage supplied by the batteries.
> When they use an RC oscillator
> A real test must be don with a constant voltage power supply (something
> like +-0.1% to see anything).
> Besides that a 32768Hz crystal normally are used in RTC and PLLs.
> I'll check your graphs to try to discover something (I'm working with
> some z8s180 but they use a normal oscillator with a XMHz crystal).
>
> Ale
>
>
>
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