Datasheet

Clock Generator Module (CGMC)
Functional Description
MC68HC908GR8 — Rev 4.0 Technical Data
MOTOROLA Clock Generator Module (CGMC) 111
The series resistor (R
S
) is included in the diagram to follow strict Pierce
oscillator guidelines. Refer to the crystal manufacturer’s data for more
information regarding values for C1 and C2.
Figure 7-2 also shows the external components for the PLL:
• Bypass capacitor, C
BYP
• Filter network
Routing should be done with great care to minimize signal cross talk and
noise.
See CGM Component Specifications for capacitor and resistor values.
Figure 7-2. CGMC External Connections
OSC1
C1 C2
SIMOSCEN
CGMXCLK
RB
X1
RS
CBYP
OSC2
CGMXFC
V
DDA
Note: Filter network in box can be replaced with a 0.47 µF capacitor, but will degrade stability.
V
DD
OSCSTOPENB
(FROM CONFIG)
10 k
0.01
µF
0.033
µF
V
SSA
0.1 µF
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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