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| C8051F54X_14 Datasheet, PDF (146/275 Pages) Silicon Laboratories – Mixed Signal ISP Flash MCU Family | |||
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C8051F54x
Equation 17.2. C Mode Oscillator Frequency
f = ï¨KFï© ï¤ ï¨R ï´ VDDï©
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 17.6
(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.
146
Rev. 1.1
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