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what is meant by clock frequency?
Also called clock rate, the

Also called clock rate, the speed at which a microcontroller executes instructions. Nearly Every microcontroller contains an internal clock that regulates the rate at which instructions are executed and synchronizes all the various microcontroller components. The CPU requires a fixed number of clock ticks (or clock cycles) to execute each instruction. The faster the clock, the more instructions the CPU can execute per second.
Clock speeds are expressed in megahertz (MHz) or gigahertz ((GHz).