Hello sir.....
i am new in the field of controllers..... i have some doubts to ask....
The crystal which we are using ..its made up by which material?
Why we use capacitor with crystal in microcontroller circuit?
Also new in the field of electronics?
Here's some info about the function of the crystal for an 8051: www.8052.com/tuttimng.phtml
As already noted, there's plenty to be found with google: www.lmgtfy.com
for example, here's Maxim's APPLICATION NOTE 2154, "Microcontroller Clock—Crystal, Resonator, RC Oscillator, or Silicon Oscillator?"
Abstract: Crystals, ceramic resonators, RC (resistor, capacitor) oscillators, and silicon oscillators are four types of clock sources for use with a microcontroller (µC). The optimal clock source for an application depends on many factors including cost, accuracy, and environmental parameters. This application note discusses the determining factors for selecting a microcontroller clock. Oscillator types are compared.
www.maxim-ic.com/.../2154
You should be able to take it from there...