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Which capacitance to put with microcontroller timing crystals?

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treez

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Hello, we are using an SAM3N00B microcontroller and have a 32.768KHz crystal connected to it, as well as a 4MHz crystal connected to it, (on the other crystal connection pins)

Do you know which capacitance value goes with these crystals?...Also do you know if we need series resistors or not?

32.768KHZ crystal datasheet: (ABS25-32.768KHz) = Farnell 1611824
http://www.abracon.com/Resonators/abs25.pdf

4MHz crystal datasheet: (ABLS-4.000MHz-B2-T) = Farnell 1652553
http://www.abracon.com/Resonators/abls.pdf


Here is the microcontroller datasheet: (SAM3N00B)
http://www.atmel.com/Images/doc11011.pdf
 

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