topic what is prescaled system clock ? in Kinetis Microcontrollers

what is prescaled system clock ?

hemant2007 — Mon, 14 Sep 2015 05:56:11 GMT

What do you meant by prescaled system clock ?

My SPI2 is connected to serial flash and core clock is 120Mhz. I want to calculate SCK baud rate using formula SCK baud rate = ( fSYS /PBR) x [(1+DBR)/BR]

PBR =2 DBR=0 and BR = 2

What is meant by prescaled system clock?

Re: what is prescaled system clock ?

Alice_Yang — Tue, 15 Sep 2015 02:57:40 GMT

Hello undale,

Which chip do you use ?

The fSYS means the system clock or bus clock .

Hope it helps

Have a great day,

Alice

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

Re: what is prescaled system clock ?

meedandeys — Mon, 28 Mar 2016 17:16:11 GMT

Hello,

DSPI module is clocked from Peripheral Clock, hence FSYS refers to peripheral clock. Please refer to Clock Architecture of your controller reference manual to understand the relationship/configurations of SystemClock to PBRIDGE clock.

I hope this helps.