Figure 2-5 Colpitts Oscillator Connections (Pe7=1); Figure 2-6 Pierce Oscillator Connections (Pe7=0); Figure 2-7 External Clock Connections (Pe7=0) - Motorola MC9S12C-Family User Manual

Device User Guide — 9S12C128DGV1/D V01.05
EXTAL
C *
DC
C
MCU Crystal or
1
ceramic resonator
XTAL
C
2
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

Figure 2-5 Colpitts Oscillator Connections (PE7=1)

EXTAL
C
1
MCU
R Crystal or
B
ceramic resonator
*
R
S
XTAL
C
2
VSSPLL
* Rs can be zero (shorted) when use with higher frequency crystals.
Refer to manufacturer's data.

Figure 2-6 Pierce Oscillator Connections (PE7=0)

EXTAL
CMOS-COMPATIBLE
EXTERNAL OSCILLATOR
(VDDPLL-Level)
MCU
XTAL
not connected

Figure 2-7 External Clock Connections (PE7=0)

59