Can someone suggest what is the clock frequency of HCLK, FCLK, DCLK, XTAL1 and XTAL2 in Cortex M0. These click are generated in module named as mcu_clkctrl.
These things are usually configurable and/or governed by your particular design - of which we know nothing at all.
Or are you asking what are the max/min limits on these things? But that would depend on the particular chip - again, we know nothing about that!
But they would be specified in the chip datasheet.
XTAL usually refers to an external quartz crystal - so you will have to look at your board to find what that is.
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