MC68HC908GR16 Datasheet, PDF (68/310 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Clock Generator Module (CGM)
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 4-2 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 20.12 Clock Generation Module Characteristics for capacitor and resistor
values.
SIMOSCEN
OSCSTOPENB
(FROM CONFIG)
OSC1
R_B
X1
C1
CGMXCLK
OSC2
CGMXFC
R_S
R_F1
C_F2
C_F1
C2
V_SSA
V_DDA
V_DD
C_BYP
Note: Filter network in box can be replaced with a single capacitor, but will degrade stability.
Figure 4-2. CGM External Connections
Data Sheet
68
Clock Generator Module (CGM)
For More Information On This Product,
Go to: www.freescale.com
MC68HC908GR16 — Rev. 1.0
MOTOROLA