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Thread: Working dual-clock speeds
www.piclist.com/techref/microchip/time.htm?key=clock
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face BY : Dan Michaels email (remove spam text)



Olin Lathrop wrote:
>> Ya missed the point - this is not to do a low power lashup like Roman,
>> but to find an easy way to select between 2 different external clocks,
>> without having to use a lot of extra logic.
>
>OK, but why would you want to use the low clock rate except to save power?
>

In this particular case, the idea was to have easy control over
"sampling rate" of some fast RAM - not to clock a microprocessor.
Seemed like a natural extension to what Roman was talking about.

Even with a fast Scenix, it is hard to get a 20Mhz controllable
clock output, but with the ECS chip [only 8-pin] you can get 20,
10, and 5 Mhz, and then use the uC for slower timing. Problem is,
with the ECS chip, 20Mhz [nondivided] comes out one pin and
10/5/... [divided] comes out another pin.

You can always use AND gates for switching, but I was hoping
for something simpler. Rich Ottosen may be onto it.

- dan michaels
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