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AN849
| Title |
Title
Basic PICmicro® Oscillator Design
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|---|---|
| Name |
Name
AN849
|
| Date |
Date
06/24/2015
|
| Description |
Description
The oscillator circuit for almost any microcontroller is a fairly simple design with very few components. Selecting the values for capasitors and resistors from the manufacturer's data books will get you a circuit that oscillates. However, many conditions can adversely affect the performance of your oscillator design. Higher temperatures and lower supply voltages can lower the amplifier gain (and thus the loop gain in the oscillator circuit) causing poor, slow, or no start-up. Colder temperatures and higher supply voltages can increase amplifier gain, causing the circuit to be forced to a higher harmonic and throw off the timing. The crystal can also be overdriven and become potentially damaged and cease functioning altogether. It is also possible to waste power through the improper selection of components or Clock modes.
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