The oscillator circuit is one of the most overlooked areas of microprocessor circuit design. Components are usually selected based on the manufacturers tables. If the circuit starts up and works, fine, no othe thought need be given to it, right? Wrong. Many condi tions can negatively affect the performance of you design. Higher temperatures and lower supply voltages can lower the loop gain in the oscillator circuit, causing poor, slow, or no start-up. Colder temperatures and higher supply voltages can increase the loop gain o the oscillator circuit, causing the crystal to be over driven, and potentially damaged; or the circuit can be forced to another harmonic and throw off the timing, o cease functioning altogether. It is also possible to waste power through the improper selection of compo nents or Clock modes.M FACT001 Basic PIC16/17 Oscillator Design FIGURE 1: TYPICAL PIERCE PARALLEL Author: Dan Matthews RESONANT OSCILLATOR Microchip Technology Inc. CIRCUIT Gain of inverter/amplifier is based on selected Clock mode. The oscillator circuit is one of the most overlooked Clock Modes: areas of microprocessor circuit design. Components ……