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| MC68HC08AS20 Datasheet, PDF (374/386 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers | |||
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21.9 CGM Operating Conditions
Characteristic
Crystal Reference Frequency
Crystal Cycle Speed
Range Nominal Multiplier
VCO Center-of-Range Frequency(1)
Medium Voltage VCO Center-of-Range Frequency
VCO Frequency Multiplier
VCO Center-of-Range Multiplier
VCO Operating Frequency
1. 5.0 V ±10% VDD only
Symbol
Min
Typ
Max
fxclk
1
â
8
CGMXCLK
fnom
1/fXCLK
â
â
4.9152
1/fXCLK
â
4.9152 â
36.1
fvrs
4.9152 â
16.4
N
1
â
15
L
1
â
15
fvclk
fvrsmin
â
fvrsmax
Unit
MHz
MHz
MHz
MHz
MHz
â
â
MHz
21.10 CGM Component Information
Characteristic
Symbol Min
Typ
Max
Crystal (X1) Frequency (MHz)(1)
fxclk
1
4.9152
8
Crystal Load Capacitance(2)
CL
â
â
â
Crystal Fixed Capacitance(2)
C1
â
2 Ã CL
â
Crystal Tuning Capacitance(2)
C2
â
2 Ã CL
â
Feedback Bias Resistor
RB
â
1
â
Series Resistor(3)
RS
0
â
3.3
Filter Capacitor
CF
â
Cfact à (VDDA/fxclk)
â
Bypass Capacitor(4)
Cbyp
â
0.1
â
1. Fundamental mode crystals only
2. Consult crystal manufacturerâs data.
3. Not required
4. Cbyp must provide low AC impedance from f = fxclk/100 to 100 Ã fvclk, so series resistance must be considered.
Unit
MHz
pF
pF
pF
Mâ¦
kâ¦
pF
µF
Advance Information
374
MC68HC08AS20 âRev. 4.1
Freescale Semiconductor
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