PC912XDP512F0CALR datasheet(121/1348 Pages) FREESCALE

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Chapter 3 Pierce Oscillator (S12XOSCLCPV1)

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

121

EXTAL input frequency. In full stop mode (PSTP = 0), the EXTAL pin is pulled down by an internal

resistor of typical 200 k

Ω.

NOTE

Freescale recommends an evaluation of the application board and chosen

resonator or crystal by the resonator or crystal supplier.

Loop controlled circuit is not suited for overtone resonators and crystals.

Figure 3-2. Loop Controlled Pierce Oscillator Connections (XCLKS = 1)

NOTE

Full swing Pierce circuit is not suited for overtone resonators and crystals

without a careful component selection.

Figure 3-3. Full Swing Pierce Oscillator Connections (XCLKS = 0)

Figure 3-4. External Clock Connections (XCLKS = 0)

MCU

EXTAL

XTAL

VSSPLL

Crystal or

Ceramic Resonator

* Rs can be zero (shorted) when use with higher frequency crystals.

Refer to manufacturer’s data.

MCU

EXTAL

XTAL

RS*

VSSPLL

Crystal or

Ceramic Resonator

MCU

EXTAL

XTAL

Not Connected

CMOS Compatible

External Oscillator

(VDDPLL Level)

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