Re: A89: Re: 89 timer
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Re: A89: Re: 89 timer
What does a maskable on interrupt have to do with anything? All that means
is that the on interrupt will be called even if interrupts are disabled.
To have a clock running all the time, the processor would be turned on and
off ~200 times a second. That's going to seriously effect battery life,
and the lithium battery alone can't run the processor.
At 08:23 PM 9/9/98 EDT, you wrote:
>
>> 2) When the calculator is off, it turns off the LCD and executes a HALT to
>> wait in low power mode for the ON interrupt. You'd have to simulate the
>> calc being off by shutting off the screen, wait for the interrupt (timer),
>> update your clock counter and HALT again until the next one. This occuring
>> 175-200 times a second would use up much more power than when normally off.
>
>Actually not, in fact it might even be able to run without the
>AAA batteries. The ON interrupt is maskable on the 86, so
>having an efficient clock program running would make almost
>no difference.
>
--
David Phillips
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