C8051F58X Datasheet, PDF(185/356 Page) Silicon Laboratories – Programmable hysteresis and response time Configurble as interrupt or reset source Low current

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C8051F58X Datasheet, PDF (185/356 Pages) Silicon Laboratories – Programmable hysteresis and response time Configurble as interrupt or reset source Low current

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C8051F58x/F59x

f = ï¨KFï© ï¤ ï¨R ï´ VDDï©

Equation 19.2. C Mode Oscillator Frequency

For example: Assume VDD = 2.1 V and f = 75 kHz:

f = KF / (C x VDD)ï

0.075 MHz = KF / (C x 2.1)

Since the frequency of roughly 75 kHz is desired, select the K Factor from the table in SFR Definition 19.6

(OSCXCN) as KF = 7.7:

0.075 MHz = 7.7 / (C x 2.1)ï

C x 2.1 = 7.7 / 0.075 MHzï

C = 102.6 / 2.0 pF = 51.3 pF

Therefore, the XFCN value to use in this example is 010b.

Rev. 1.2

185

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