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I got confused with the function of pull up & pull down resistor. A resistor does not changes its property whether it is used as a pull up or pull down resistor. And I’m sorry to say that the way in which you explained seems a bookish language so if possible plz explain it in easy way.
In case of microcontroller, in order to provide a clock frequency of 12MHz we use a ceramic capacitor without any resistor why???
Also for RESET circuitry we use a electrolytic capacitor. Why ?
What is the reason behind the selection of these capacitors ?