TOOLSTICK560DC Silicon Laboratories Inc, TOOLSTICK560DC Datasheet - Page 165
![DAUGHTER CARD TOOLSTICK F560](/photos/9/25/92542/toolstick560dc_sml.jpg)
TOOLSTICK560DC
Manufacturer Part Number
TOOLSTICK560DC
Description
DAUGHTER CARD TOOLSTICK F560
Manufacturer
Silicon Laboratories Inc
Series
ToolStickr
Type
MCUr
Specifications of TOOLSTICK560DC
Contents
Daughter Card
Processor To Be Evaluated
C8051F55x, C8051F56x, C8051F57x
Interface Type
USB
Operating Supply Voltage
2.7 V to 3.6 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
C8051F55x, C8051F56x, C8051F57x
For Use With
336-1345 - TOOLSTICK BASE ADAPTER336-1182 - ADAPTER USB DEBUG FOR C8051FXXX
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1719
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18.4.2. 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 18.1, 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 18.6, the required XFCN setting is 010b.
18.4.3. External Capacitor Example
If a capacitor is used as an external oscillator for the MCU, the circuit should be configured as shown in
Figure 18.1, 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 according to Equation , where f = the frequency of oscil-
lation in MHz, C = the capacitor value in pF, and V
Figure 18.3. External 32.768 kHz Quartz Crystal Oscillator Connection Diagram
3
)/RC = 1.23(10
22pF*
* Capacitor values depend on
Equation 18.1. RC Mode Oscillator Frequency
3
)/[246 x 50] = 0.1 MHz = 100 kHz
crystal specifications
32.768 kHz
10M
f
=
1.23 10
Rev. 1.1
DD
22pF*
= the MCU power supply in Volts.
3
R C
XTAL1
XTAL2
C8051F55x/56x/57x
165
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