资料介绍
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
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