PC912XDP512F0CFVR datasheet(121/1348 Pages) FREESCALE

Il numero della parte	PC912XDP512F0CFVR

Spiegazioni elettronici	HCS12X Microcontrollers

PDF	1348 Pages

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Produttore elettronici	FREESCALE [Freescale Semiconductor, Inc]

Homepage	http://www.freescale.com

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121 / 1348 page

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)

PC912XDP512F0CFVR Scheda tecnica(PDF) 121 Page - Freescale Semiconductor, Inc