mc68hc912dg128 Freescale Semiconductor, Inc, mc68hc912dg128 Datasheet - Page 418

• Manufacturer Part Number: mc68hc912dg128
• Description: M68hc12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Appendix: CGM Practical Aspects
Technical Data
418
Freescale Semiconductor, Inc.
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For More Information On This Product,
Mount the PLL filter and oscillator components as close to the
MCU as possible.
Do not allow the EXTAL and XTAL signals to interfere with the
XFC node. Keep these tracks as short as possible.
Do not cross the CGM signals with any other signal on any level.
Remember that the reference voltage for the XFC filter is
VDDPLL.
As the return path for the oscillator circuitry is VSSPLL, it is
extremely important to CONNECT VSSPLL to VSS even if the
PLL is not to be powered. Surface mount components reduce the
susceptibility of signal contamination.
Ceramic resonators with built-in capacitors are available. This is
an interesting solution because the parasitic components involved
are minimized due to the close proximity of the resonating
elements.
Appendix: CGM Practical Aspects
Go to: www.freescale.com
MC68HC912DG128 — Rev 3.0
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