MC68HC08AS32 Datasheet, PDF (270/280 Pages) Motorola, Inc – M68HC08 Family of 8-bit microcontroller units (MCUs)

17.8 CGM Operating Conditions
Characteristic
Crystal reference frequency
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% V_DD only
17.9 CGM Component Information
Symbol
f_XCLK
f_NOM
f_VRS
N
L
f_VCLK
Min
1
—
4.9152
4.9152
1
1
f_VRSMIN
Typ
—
4.9152
—
—
—
—
—
Max
8
—
32.8
16.4
15
15
f_VRSMAX
Unit
MHz
MHz
MHz
MHz
—
—
MHz
Characteristic
Symbol
Min
Typ
Max
Unit
Crystal (X1) frequency (MHz)⁽¹⁾
f_XCLK
1
4.9152
8
MHz
Crystal load capacitance⁽²⁾
C_L
—
—
—
µF
Crystal fixed capacitance⁽²⁾
C₁
—
2 × C_L
—
µF
Crystal tuning capacitance⁽²⁾
C₂
—
2 × C_L
—
µF
Feedback bias resistor
R_B
—
1
—
MΩ
Series resistor⁽³⁾
R_S
0
—
3.3
kΩ
Filter capacitor
C_F
—
C_Fact × (V_DDA/f_XCLK)
—
µF
Bypass capacitor⁽⁴⁾
C_BYP
—
0.1
—
µF
1. Fundamental mode crystals only
2. Consult crystal manufacturer’s data.
3. Not required
4. C_BYP must provide low AC impedance from f = f_XCLK/100 to 100 × f_VCLK, so series resistance must be considered.
Data Sheet
270
MC68HC08AS32 — Rev. 4.1
Freescale Semiconductor