Motorola MC9S12C-Family, MC9S12GC-Family Phase Locked Loop, Table B-11 Oscillator Characteristics

Device User Guide — 9S12C128DGV1/D V01.05

time tUPOSC. The device features a clock monitor. A time-out is asserted if the frequency of the incoming clock signal is below the Clock Monitor FailureAssert Frequency fCMFA.

Table B-11 Oscillator Characteristics

Conditions are shown in Table A-4 unless otherwise noted

Num	C	Rating	Symbol	Min	Typ	Max	Unit
1a	C	Crystal oscillator range (Colpitts)	fOSC	0.5		16	MHz
1b	C	Crystal oscillator range (Pierce) 1(4)	fOSC	0.5		40	MHz
2	P	Startup Current	iOSC	100			μA
3	C	Oscillator start-up time (Colpitts)	tUPOSC		82	1003	ms
4	D	Clock Quality check time-out	tCQOUT	0.45		2.5	s
5	P	Clock Monitor Failure Assert Frequency	fCMFA	50	100	200	KHz
6	P	External square wave input frequency 4	fEXT	0.5		50	MHz
7	D	External square wave pulse width low	tEXTL	9.5			ns
8	D	External square wave pulse width high	tEXTH	9.5			ns
9	D	External square wave rise time	tEXTR			1	ns
10	D	External square wave fall time	tEXTF			1	ns
11	D	Input Capacitance (EXTAL, XTAL pins)	CIN		7		pF
12	C	DC Operating Bias in Colpitts Configuration	VDCBIAS		1.1		V
		on EXTAL Pin
NOTES:

1.Depending on the crystal a damping series resistor might be necessary

2.fosc = 4MHz, C = 22pF.

3.Maximum value is for extreme cases using high Q, low frequency crystals

4.XCLKS =0 during reset

B.6.3 Phase Locked Loop

The oscillator provides the reference clock for the PLL. The PLL´s Voltage Controlled Oscillator (VCO) is also the system clock source in self clock mode.

B.6.3.1 XFC Component Selection

This section describes the selection of the XFC components to achieve a good filter characteristics.

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