[HELP] How to get a 32K clock from a 48M clock?

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lovelyic

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how to get a 32k(32768) clock from a 48M clock?
Thanks!
 

why u can't use freq. divider?
 

Question for you: what technology do you use?

You can always use flipflops for division by 2. If you can live with a duty cycle that's not equal to 50 percent, counters are the easiest way. If this is not possible, inside FPGA's there are DCM's that can do divisions other than a 2^n with a 50 percent duty cycle.
 

counter is best select for your this application.
VCO maybe a special way for some specail application!
 

hi,

the 32768 hz is used in RTC (Real Time Clock)?
 

Can you do other reverse , You can use 32k to generate the 48MHz , The 32.768 is RTC clock , and the 48Mhz is like apply in USB ,so that maybe you can make reverse for your application
 

You can't usually use a 48MHz clock generated from a PLL to drive a USB controller.
It has to much jitter
 

If the application is in USB 1.1 , It is ok , Becasue we have do that , But if it will apply in USB2.0 , The jitter will be a issuee
 

Strange question.
I think use flipflop as divider is simplest way.
 

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