Post by thread:Crystal Oscillator Circuit

Hi, I'm new to using the PIC uProc and am trying to setup a target circuit. I am working with a PIC16c74. I have a 4M Hz, 8M Hz, and 20M Hz crystal (CYL XTAL CA-301 Type). All should be compatible provided I'm not running at low power. My problem is I didn't receive any spec sheets on the crystals, and do not know the proper circuit configuration for them. Any information on how to use the crystals I have to provide the oscillator input to the PIC would be appreciated. Thanks, -Aaron Buchanan ***------------------------------------------------------------------*** * Aaron Buchanan spam_OUTaxb9910TakeThisOuTrit.edu * * Dept. of Computer Engineering Rochester Institute of Technology * ***------------------------------------------------------------------***

El día Domingo 27 de Julio de 1997 14:41:29 usted escribió: > >at low power. My problem is I didn't receive any spec sheets on the >crystals, > >Thanks, >-Aaron Buchanan > > > Check out Microchip's site, application notes - Oscillators.

re: Crystal Oscillators Aaron, the crystal is an Epson CA-301 type. The crystal goes between OSC1 and OSC2. Use the following capacitors from OSC1 and OSC2 to ground: 4Mhz - 15pf (XT or HS mode) 8Mhz - 15pf - 33pf (HS Mode) 20Mhz - 15pf - 33pf (HS Mode) I normally use 15pf caps. Keep the leads as short as possible. You can get data sheets and app notes from Microchip's web page at: http://www.microchip.com - Tom At 02:41 PM 7/27/97 -0400, you wrote: {Quote hidden}>Hi, > >I'm new to using the PIC uProc and am trying to setup a target circuit. >I am working with a PIC16c74. I have a 4M Hz, 8M Hz, and 20M Hz crystal >(CYL XTAL CA-301 Type). All should be compatible provided I'm not >running >at low power. My problem is I didn't receive any spec sheets on the >crystals, >and do not know the proper circuit configuration for them. Any >information on >how to use the crystals I have to provide the oscillator input to the PIC >would >be appreciated. > >Thanks, >-Aaron Buchanan