S32 Design StudioのトピックHow to measure the system clock?

How to measure the system clock?

578294688 — Wed, 18 Jul 2018 08:03:18 GMT

Hello!

First explain that the chip I used is S32R274,the IDE is S32 Design Studio for Power 2017 R1.

I set the system clock at 120MHz,and try two ways,one is open the PLL1 fraction function,another is closed.At two situation,I use the I/O toggle to test,find the speed of toggling is equal.And then I set the system clock to be 60MHz,the speed of toggling is a half.

To get the real number of the system clock,I try to read the CMU register,because it has a function for metering the frequence,but just for the IRC.

So!!! How can I get the real system clock?Read the register or use the oscilloscope.

Thank you!

Re: How to measure the system clock?

jiri_kral — Thu, 19 Jul 2018 09:01:46 GMT

Hi,

the easiest way is enable clock out and use oscilloscope:

Jiri

Re: How to measure the system clock?

578294688 — Fri, 20 Jul 2018 00:51:43 GMT

Hello,Jiri.

This is a easiest way to solve the problem,it may be that I don't clear my meaning,I just have the daughter board of the EVB board,I can not measure the CLK_OUT pin.Do you have other methods?

Thank for your help!