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C8051F300 Datasheet(PDF) 98 Page - List of Unclassifed Manufacturers |
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C8051F300 Datasheet(HTML) 98 Page - List of Unclassifed Manufacturers |
98 / 174 page C8051F300/1/2/3/4/5 98 Rev. 2.6 11.5. External RC Example If an RC network is used as an external oscillator source for the MCU, the circuit should be configured as shown in Figure 11.1, Option 2. The capacitor should be no greater than 100 pF; however for very small capacitors, the total capacitance may be dominated by parasitic capacitance in the PCB layout. To deter- mine the required External Oscillator Frequency Control value (XFCN) in the OSCXCN Register, first select the RC network value to produce the desired frequency of oscillation. If the frequency desired is 100 kHz, let R = 246 k Ω and C = 50 pF: f = 1.23( 103 ) / RC = 1.23 ( 103 ) / [ 246 x 50 ] = 0.1 MHz = 100 kHz Referring to the table in SFR Definition 11.3, the required XFCN setting is 010b. 11.6. External Capacitor Example If a capacitor is used as an external oscillator for the MCU, the circuit should be configured as shown in Figure 11.1, Option 3. The capacitor should be no greater than 100 pF; however for very small capacitors, the total capacitance may be dominated by parasitic capacitance in the PCB layout. To determine the required External Oscillator Frequency Control value (XFCN) in the OSCXCN Register, select the capaci- tor to be used and find the frequency of oscillation from the equations below. Assume VDD = 3.0 V and f = 150 kHz: f = KF / (C x VDD) 0.150 MHz = KF / (C x 3.0) Since the frequency of roughly 150 kHz is desired, select the K Factor from the table in SFR Definition 11.3 as KF = 22: 0.150 MHz = 22 / (C x 3.0) C x 3.0 = 22 / 0.150 MHz C = 146.6 / 3.0 pF = 48.8 pF Therefore, the XFCN value to use in this example is 011b and C = 50 pF. |
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