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'[PIC]: 100 Hz MPU clock, more details...'
2000\11\17@111652 by John Pearson

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Thanks everyone for the responces.

The mpu reset circuit with rc network sounds interesting. I wonder if an rc
network could be applied directly to the mpu reset input that will oscilate
the reset pin, Hmmmmm.

The circuit will be powered from a 120 Hz wall transformer (US).

100 Hz is the minimum. Higher speed is okay but I want it as slow as
possible. It will control an optical display using the memory as a sort of
'paper tape' that has the display patterns 'punched in', like a player
piano. The clock will control display speed. I need all the memory for data
and have only 12 bytes or so left for code.

120 Hz from the mains would be fine but then I need to rectify and filter
and regulate for MPU power.

Thanks again.

John

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2000\11\17@174747 by mike

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On Fri, 17 Nov 2000 20:06:24 -0800, you wrote:

>Thanks everyone for the responces.
>
>The mpu reset circuit with rc network sounds interesting. I wonder if an rc
>network could be applied directly to the mpu reset input that will oscilate
>the reset pin, Hmmmmm.
>
>The circuit will be powered from a 120 Hz wall transformer (US).
>
>100 Hz is the minimum. Higher speed is okay but I want it as slow as
>possible. It will control an optical display using the memory as a sort of
>'paper tape' that has the display patterns 'punched in', like a player
>piano. The clock will control display speed. I need all the memory for data
>and have only 12 bytes or so left for code.
In which case a 32K crystal, or RC if accuracy is not critical, is
probably the simplest. The only sensible reason to mess with very low
clocks is to get ultra-low power draw. You can use TMR0 & the prescaler to get a nice slow timer for your
application with minimal code - easily inside your 12 words!
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