Hi guys
I'm looking for a very basic explanation on how a crystal circuit is designed to generate a clock pulse that drives an 8bit CPU. I gather from reading around that a 4pin Crystal Oscillator is a total package set to produce a certain frequency. What I am trying to comprehend is how to generate a clock pulse using a 2pin stand alone crystal with whatever passive components and or inverters. I recently came across a 6809 that has Extal and Xtal pins with a crystal across both pins grounded via two capacitors. (I believe this is used to produce an external clock pulse?)
So if possible can somebody please explain
1) The design of a stand alone 2 pin crystal circuit that produces a square clock wave (not a 4pin crystal oscillator)
2) How and what the crystal does when connected to cpu pins Extal and Xtal via capacitors.
Thanks
I'm looking for a very basic explanation on how a crystal circuit is designed to generate a clock pulse that drives an 8bit CPU. I gather from reading around that a 4pin Crystal Oscillator is a total package set to produce a certain frequency. What I am trying to comprehend is how to generate a clock pulse using a 2pin stand alone crystal with whatever passive components and or inverters. I recently came across a 6809 that has Extal and Xtal pins with a crystal across both pins grounded via two capacitors. (I believe this is used to produce an external clock pulse?)
So if possible can somebody please explain
1) The design of a stand alone 2 pin crystal circuit that produces a square clock wave (not a 4pin crystal oscillator)
2) How and what the crystal does when connected to cpu pins Extal and Xtal via capacitors.
Thanks