MC68HC08AB16A Datasheet, PDF (375/380 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Electrical Specifications
Clock Generation Module Characteristics
23.12 Clock Generation Module Characteristics
23.12.1 CGM Operating Conditions
Characteristic
Operating Voltage
Crystal Reference Frequency
Module Crystal Reference
Frequency
Range Nom. Multiplier (MHz)
VCO Center-of-Range Frequency
(MHz)
VCO Operating Frequency (MHz)
Symbol Min
Typ
V_DD
4.5 V
—
f_RCLK
1
—
f_XCLK
—
4.9152 MHz
f_NOM
—
4.9152
f_VRS
4.9152
—
f_VCLK
4.9152
—
Max
5.5 V
8.4
—
—
32.0
32.0
Comments
Same Frequency as
f_RCLK
4.5 to 5.5 V, V_DD only
4.5 to 5.5 V, V_DD only
23.12.2 CGM Component Information
Characteristic
Symbol Min
Typ
Max
Comments
Crystal load capacitance
C_L
—
—
—
Consult crystal
manufacturer’s data
Crystal fixed capacitance
C₁
—
2 × C_L
—
Consult crystal
manufacturer’s data
Crystal tuning capacitance
C₂
—
2 × C_L
—
Consult crystal
manufacturer’s data
Feedback bias resistor
R_B
—
22MΩ
—
Series resistor
R_S
—
330kΩ
1MΩ Not required
Filter capacitor multiply factor C_Fact
—
0.0154
—
F/s V
Filter capacitor
See 9.5.3 External Filter
C_F
—
C_Fact × (V_DDA/f_XCLK)
—
Capacitor Pin
(CGMXFC).
Bypass capacitor
C_BYP
—
0.1 µF
C_BYP must provide low
AC impedance from f =
—
f_XCLK/100 to 100 ×
f_XCLK, so series
resistance must be
considered.
MC68HC08AB16A — Rev. 2.0
MOTOROLA
Electrical Specifications
For More Information On This Product,
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Technical Data
375