C8051F700DK Silicon Laboratories Inc, C8051F700DK Datasheet - Page 178
![DEV KIT FOR C8051F700](/photos/9/23/92340/c8051f700dk_sml.jpg)
C8051F700DK
Manufacturer Part Number
C8051F700DK
Description
DEV KIT FOR C8051F700
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Datasheets
1.C8051F700-TB.pdf
(1 pages)
2.C8051F700-TB.pdf
(306 pages)
3.C8051F700-TB.pdf
(18 pages)
Specifications of C8051F700DK
Contents
Board, Cables, CD, Debugger, Power Supply
Processor To Be Evaluated
C8051F7x
Processor Series
C8051F7xx
Interface Type
USB
Operating Supply Voltage
3.3 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
C8051F7xx
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1635
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- Download datasheet (2Mb)
C8051F70x/71x
27.3.2. 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 27.1, 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, according to Equation , where
f = the frequency of oscillation in MHz, C = the capacitor value in pF, and R = the pull-up resistor value in
k.
For example: If the frequency desired is 100 kHz, let R = 246 k and C = 50 pF:
f = 1.23( 10
Referring to the table in SFR Definition 27.4, the required XFCN setting is 010b.
178
Figure 27.2. External 32.768 kHz Quartz Crystal Oscillator Connection Diagram
3
) / RC = 1.23 ( 10
22pF*
* Capacitor values depend on
Equation 27.1. RC Mode Oscillator Frequency
crystal specifications
3
) / [ 246 x 50 ] = 0.1 MHz = 100 kHz
32.768 kHz
10M
f
=
1.23 10
Rev. 1.0
22pF*
3
R C
XTAL1
XTAL2
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