[S32K324] What's the max frequency of the CLKOUT_RUN_CLK

[GavinLi1]

Hi,

I'm using the CLKOUT_RUN function, eg, using the PTB5, to output the tested clock source.

But I find that the  CLKOUT_RUN_CLK can't output about over 20Mhz, right?

I don't find information from the RM or DS about the max frequency of the CLKOUT_RUN_CLK.

Could you help me check that?

Thanks,

Gavin

[petervlna]

Hello,

PTB5 is a GPIO-STANDARD-PLUS pad (See IOMUX spreadsheet), meaning it can only be driven at a maximum of 25MHz. (Section 4.4.1 of the RM)

You should be able to drive faster speeds out of PTD10 (GPIO-FAST, Up to 120MHz switching according to the same chapter of RM)

The reason is there are a limited number of medium/fast pads on S32K3, and on the eval board most of these are routed to high-speed interfaces such as Ethernet or QSPI

Best regards,

Peter