what is a post pre scaled clock

[balavinayagam]

hi all
i want to know what is meant by a post prescaled clock...

Thanks in advance

 

[atul.singh008]

Pre scaling and post scaling is some kind of multiplier or divider to the actual clock signal, which will give the same signal as of we have connected a large value crystal.

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Here pre means at the input side while the post means operation done at the output.

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With regards,
ATUL SINGH

 

[balavinayagam]

So in this case .the clock is both pre scalable as well as post scalable...Am i right?

---------- Post added at 07:42 ---------- Previous post was at 07:41 ----------

What is the advantage of doing so..

Thanks for the reply

 

[atul.singh008]

as i already told in my previous thread that u can achieve a clock of higher frequency using a clock lower frequency value.

 

[qieda]

Hi,

I know a predivider or postdivider with a PLL.
Because a PLL has a limited input range (e.g. form 1MHz to 2MHz) we need the pre dividing to connect a clock with a high frequency
A PLL often has also a limited output range (e.g. 250MHz to 500MHz) so you need a post divider to get the correct output frequency

What is the circuit which uses your pre/post scaled clock?

regards

 

[balavinayagam]

The clock was connected to a wake up timer..thanks for the reply ..I understood the idea