Motorola MC9S12DG128B 4 Colpitts Oscillator Connections PE7=1, 6 External Clock Connections PE7=0

Models: MC9S12DT128B

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Figure 2-4 Colpitts Oscillator Connections (PE7=1)

EXTAL

MCU

XTAL

CDC *

MC9S12DT128B Device User Guide — V01.07

C1

 

Crystal or

ceramic resonator

C2

VSSPLL

*Due to the nature of a translated ground Colpitts oscillator a DC voltage bias is applied to the crystal

Please contact the crystal manufacturer for crystal DC bias conditions and recommended capacitor value CDC.

Figure 2-4 Colpitts Oscillator Connections (PE7=1)

EXTAL

MCU

XTAL

RB

RS*

C1

Crystal or RB ceramic resonator

C2

VSSPLL

*Rs can be zero (shorted) when used with higher frequency crystals. Refer to manufacturer’s data.

Figure 2-5 Pierce Oscillator Connections (PE7=0)

EXTAL Figure 2-5 Pierce Oscillator Connections (PE7=0) CMOS-COMPATIBLE EXTERNAL OSCILLATOR

(VDDPLL-Level)

MCU

XTAL

not connected

Figure 2-6 External Clock Connections (PE7=0)

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Page 55
Image 55
Motorola MC9S12DG128B 4 Colpitts Oscillator Connections PE7=1, 5 Pierce Oscillator Connections PE7=0, Rb Rs, not connected