MC68HC12 MOTOROLA [Motorola, Inc], MC68HC12 Datasheet - Page 456

• Manufacturer Part Number: MC68HC12
• Description: The MC68HC912DT128A microcontroller unit (MCU) is a 16-bit device composed of standard on-chip peripherals including a 16-bit central processing unit
• Manufacturer: MOTOROLA [Motorola, Inc]

Appendix: CGM Practical Aspects
Technical Data
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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.
Appendix: CGM Practical Aspects
MC68HC912DT128A — Rev 4.0
MOTOROLA