MC908GZ60CFUE Datasheet, PDF (322/352 Pages) Freescale Semiconductor, Inc – Standard features, Features of the CPU08

Electrical Specifications
21.9 Clock Generation Module (CGM) Characteristics
21.9.1 CGM Operating Conditions
Characteristic
Symbol
Min
Typ
Max
Unit
Operating voltage
V_DDA
V_SSA
V_DD – 0.3
V_SS – 0.3
—
—
V_DD + 0.3
V_SS + 0.3
V
Crystal reference frequency
f_RCLK
1
—
8
MHz
Input clock frequency (PLL off)⁽¹⁾
f_XCLK
—
—
32
MHz
Range nominal multiplier
f_NOM
—
71.42
—
kHz
VCO center-of-range frequency⁽²⁾
f_VRS
71.42k
—
40M
Hz
VCO operating frequency⁽³⁾
f_VCLK
71.42k
—
32M
Hz
1. External square wave applied to OSC1. Voltage levels must be rail-to-rail and duty cycle must be 50%.
2. Range of frequencies that VCO can produce to generate input clock to frequency divider during acquisition and tracking
modes.
3. Allowed VCO operating range.
21.9.2 CGM Component Information
Characteristic
Symbol
Min
Typ
Max
Unit
Crystal frequency
Crystal load capacitance⁽¹⁾
f_XCLK
1
—
8
MHz
C_L
—
20
—
pF
Crystal fixed capacitance⁽²⁾
C₁
—
(2 x C_L) – 5
47
pF
Crystal tuning capacitance⁽³⁾
C₂
—
(2 x C_L) – 5
47
pF
Feedback bias resistor
Series damping resistor
V_DDA/V_SSA bypass capacitor
CGMXFC filter values
R_B
—
1
10
MΩ
R_S
0
0
—
kΩ
C_byp
—
0.1
—
μF
See Table 4-5. Example Filter Component Values
1. Consult crystal manufacturer’s specification.
2. Capacitor on OSC1 pin. Does not include parasitic capacitance due to package, pin, and board.
3. Capacitor on OSC2 pin. Does not include parasitic capacitance due to package, pin, and board.
MC68HC908GZ60 • MC68HC908GZ48 • MC68HC908GZ32 Data Sheet, Rev. 6
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Freescale Semiconductor