CLK OUT PIN

[nesrinemhiri]

Hi all,

I use the FRDMK22FN512VLH12,i would like to measure the CLK out but i dont found in documentation one pin that via it i can affiche frequen cy in scope

can help me

Thank you

[santiago_gonzal]

Hello,

Search in the Reference Manual for CLKOUT. The pin is PTC2 and the register to configure that pin is the SIM_SOPT2.

Regards,

Santiago

[nesrinemhiri]

i add this line:

#define SYSTEM_SIM_SOPT2_VALUE       0x00010020U        (clkout flash frequency)

,but i see anything in the scope!! should i configure the pin in other register ?

[santiago_gonzal · Accepted solution]

Yes, you also need to configure the pin muxing.

Se this great post from Derek Snell:

Verifying Internal Clocks in Kinetis

Regards,

Santiago